New energy automobile driving motor structure sensitivity and space order electromagnetic force target analysis method

Abstract

The invention discloses a new energy automobile driving motor structure sensitivity and space order electromagnetic force target analysis method. The method comprises the following steps: 1) applying a zero-order space order electromagnetic excitation load; 2) applying a non-zero space order electromagnetic excitation load; 3) calculating a zero-order space order electromagnetic excitation structure sensitivity coefficient; 4) calculating a sensitivity coefficient of the non-zero-order space order electromagnetic excitation structure; 5) calculating a response consistency coefficient of the multi-space-order electromagnetic excitation structure; 6) sensitivity analysis; 7) formulating a zero-order space order electromagnetic force design target; 8) formulating a non-zero-order space order electromagnetic force design target; and 9) calculating an electromagnetic force risk coefficient. According to the scheme, under the conditions that a driving motor shell structure, a driving motor sample piece and test resources do not exist, accurate evaluation and problem identification of a driving motor design scheme, shell structure rigidity and assembly vibration noise performance are achieved, and forward design of a driving motor electromagnetic scheme is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of drive motors for new energy vehicles, and particularly to a method for analyzing the structural sensitivity and spatial order electromagnetic force target of a drive motor for a new energy vehicle. Background Art

[0002] The drive motor of a new energy vehicle is one of the core components for vehicle driving, and its performance directly affects the power performance, economy and user experience of the vehicle. The main function of the drive motor of a new energy vehicle is to convert electrical energy into mechanical energy, and drive the wheels through a transmission device or directly to push the vehicle forward. At the same time, when the vehicle brakes or coasts, the drive motor can also work as a generator to convert mechanical energy into electrical energy and recover energy to charge the battery.

[0003] At present, the drive motor of a new energy vehicle has the characteristics of low cost, high performance, and solving the driving anxiety of users; and has been more and more widely used. At present, the structural arrangements of drive motors for different vehicle models are diverse, and the vibration sensitivities of different structures to electromagnetic forces are significantly different. Coupled with the differences in the performance requirements of drive motors for different vehicle models, there are great differences in the design methods, pole-slot combinations, installation conditions, etc. of drive motors. Drive motors with different design schemes also have complex spatial zero-order and spatial non-zero-order electromagnetic forces. Due to the above-mentioned various forms of drive motors, it is difficult to carry out effective, fast and highly general vibration and noise performance evaluations for drive motors.

[0004] At present, in the industry, for the evaluation of the performance of drive motors, on the one hand, it is necessary to wait for the drive motor prototype to come out, and then rely on bench or vehicle tests to verify and iteratively optimize the vibration and noise performance. This will undoubtedly lead to disadvantages such as a long R & D cycle, high cost, and difficulty in locking problem points of the drive motor. On the other hand, when designing a drive motor, although the overall target of the electromagnetic noise of the drive motor can also be formulated; due to the complex electromagnetic excitation characteristics, it is impossible to put forward targeted targets for different order electromagnetic forces in the early stage of drive motor development; and it is even more impossible to accurately identify the risks of electromagnetic forces and find the optimization design direction of electromagnetic forces.

[0005] The above two problems have become the core difficulties in the development of the power drive unit of new energy vehicles. If there is no breakthrough continuously, it is impossible to achieve the early target setting of drive motors and the forward development of drive motor schemes. Summary of the Invention

[0006] In view of the above deficiencies in the prior art, the technical problem to be solved by the present invention is: how to provide a method for analyzing the structural sensitivity and spatial order electromagnetic force target of a drive motor for a new energy vehicle, which can accurately evaluate and identify problems in the drive motor design scheme, the stiffness of the housing structure, and the vibration and noise performance of the assembly, and perform forward design of the electromagnetic scheme of the drive motor, under the conditions that there is no drive motor housing structure and drive motor sample, and no test resources in the early stage of drive motor design.

[0007] To solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A method for analyzing the structural sensitivity and spatial order electromagnetic force target of a drive motor for a new energy vehicle, comprising the following steps:

[0009] Step 1) Apply a zero-order spatial order electromagnetic excitation load to the drive motor;

[0010] Step 2) Apply a non-zero-order spatial order electromagnetic excitation load to the drive motor;

[0011] Step 3) Calculate the structural sensitivity coefficient of the drive motor under zero-order spatial order electromagnetic excitation;

[0012] Step 4) Calculate the structural sensitivity coefficient of the drive motor under non-zero-order spatial order electromagnetic excitation;

[0013] Step 5) Calculate the structural response consistency coefficient of the drive motor under multi-spatial order electromagnetic excitation;

[0014] Step 6) Analyze and evaluate the structural-electromagnetic load excitation sensitivity of the drive motor;

[0015] Step 7) Formulate the design target of the zero-order spatial order electromagnetic force of the drive motor;

[0016] Step 8) Formulate the design target of the non-zero-order spatial order electromagnetic force of the drive motor;

[0017] Step 9) Calculate the electromagnetic force risk coefficient of the drive motor.

[0018] Preferably, step 1) includes a method for applying a radial zero-order spatial order electromagnetic excitation load and a method for applying a tangential zero-order spatial order electromagnetic excitation load:

[0019] The method for applying a radial zero-order spatial order electromagnetic excitation load is: sequentially apply an electromagnetic force load of 1 N along the radial direction of the cylindrical coordinate system on each stator tooth of the drive motor, and the electromagnetic force loads in all radial directions have the same phase;

[0020] The method for applying a tangential zero-order spatial-order electromagnetic excitation load is as follows: Apply an electromagnetic force load of 1 N tangentially along each stator tooth of the driving motor in turn in the cylindrical coordinate system, and the phases of all electromagnetic force loads in the tangential direction are the same.

[0021] Preferably, in step 2), there are methods for applying 6th-order spatial-order electromagnetic excitation loads, 8th-order spatial-order electromagnetic force excitation loads, 12th-order spatial-order electromagnetic excitation loads, and 24th-order spatial-order electromagnetic excitation loads;

[0022] The method for applying a 6th-order spatial-order electromagnetic excitation load includes a method for applying a radial 6th-order spatial-order electromagnetic excitation load and a method for applying a tangential 6th-order spatial-order electromagnetic excitation load;

[0023] The method for applying an 8th-order spatial-order electromagnetic excitation load includes a method for applying a radial 8th-order spatial-order electromagnetic excitation load and a method for applying a tangential 8th-order spatial-order electromagnetic excitation load;

[0024] The method for applying a 12th-order spatial-order electromagnetic excitation load includes a method for applying a radial 12th-order spatial-order electromagnetic excitation load and a method for applying a tangential 12th-order spatial-order electromagnetic excitation load;

[0025] The method for applying a 24th-order spatial-order electromagnetic excitation load includes a method for applying a radial 24th-order spatial-order electromagnetic excitation load and a method for applying a tangential 24th-order spatial-order electromagnetic excitation load.

[0026] Preferably, the method for applying a radial 6th-order spatial-order electromagnetic excitation load is as follows: Divide N stator teeth within a circumferential range of 360° into 6 equal parts, with each part corresponding to N / 6 stator teeth in space. Apply an electromagnetic force load of 1 N radially along the stator teeth of the driving motor in turn, and the phase difference of the electromagnetic forces applied between adjacent two stator teeth within each part of the space is

[0027] The method for applying a tangential 6th-order spatial-order electromagnetic excitation load is as follows: Divide N stator teeth within a circumferential range of 360° into 6 equal parts, with each part corresponding to N / 6 stator teeth in space. Apply an electromagnetic force load of 1 N tangentially along the stator teeth of the driving motor in turn, and the phase difference of the electromagnetic forces applied between adjacent two stator teeth within each part of the space is

[0028] The method for applying a radial 8th-order spatial-order electromagnetic excitation load is as follows: Divide N stator teeth within a circumferential range of 360° into 8 equal parts, with each part corresponding to N / 8 stator teeth in space. Apply an electromagnetic force load of 1 N radially along the stator teeth of the driving motor in turn, and the phase difference of the electromagnetic forces applied between adjacent two stator teeth within each part of the space is

[0029] The method for applying the tangential 8th - order spatial - order electromagnetic excitation load is as follows: Divide the N stator teeth within the circumferential range of 360° into 8 equal parts. Each spatial part corresponds to N / 8 stator teeth. Apply an electromagnetic force load of 1N tangentially along the cylindrical coordinate system on the stator teeth of the driving motor in sequence, and the phase difference of the electromagnetic force between adjacent two stator teeth within each spatial part is

[0030] The method for applying the radial 12th - order spatial - order electromagnetic excitation load is as follows: Divide the N stator teeth within the circumferential range of 360° into 12 equal parts. Each spatial part corresponds to N / 12 stator teeth. Apply an electromagnetic force load of 1N radially along the cylindrical coordinate system on the stator teeth of the driving motor in sequence, and the phase difference of the electromagnetic force between adjacent two stator teeth within each spatial part is

[0031] The method for applying the tangential 12th - order spatial - order electromagnetic excitation load is as follows: Divide the N stator teeth within the circumferential range of 360° into 12 equal parts. Each spatial part corresponds to N / 12 stator teeth. Apply an electromagnetic force load of 1N tangentially along the cylindrical coordinate system on the stator teeth of the driving motor in sequence, and the phase difference of the electromagnetic force between adjacent two stator teeth within each spatial part is

[0032] The method for applying the radial 24th - order spatial - order electromagnetic excitation load is as follows: Divide the N stator teeth within the circumferential range of 360° into 24 equal parts. Each spatial part corresponds to N / 24 stator teeth. Apply an electromagnetic force load of 1N radially along the cylindrical coordinate system on the stator teeth of the driving motor in sequence, and the phase difference of the electromagnetic force between adjacent two stator teeth within each spatial part is

[0033] The method for applying the tangential 24th - order spatial - order electromagnetic excitation load is as follows: Divide the N stator teeth within the circumferential range of 360° into 24 equal parts. Each spatial part corresponds to N / 24 stator teeth. Apply an electromagnetic force load of 1N tangentially along the cylindrical coordinate system on the stator teeth of the driving motor in sequence, and the phase difference of the electromagnetic force between adjacent two stator teeth within each spatial part is

[0034] Preferably, step 3) includes the following steps:

[0035] Step 3.1) Discretize the outer surface of the driving - motor structure into triangular elements.

[0036] Step 3.2) Calculate the total vibration energy of the outer surface of the driving motor at each excitation frequency under the action of the radial zero - order spatial - order electromagnetic excitation, and the noise caused by the total vibration energy of the outer surface of the driving motor under the action of the radial zero - order spatial - order electromagnetic excitation.

[0037] Step 3.3) Calculate the total vibration energy of the outer surface of the drive motor at each excitation frequency under the action of the tangential zero-order spatial-order electromagnetic excitation, and the noise caused by the total vibration energy of the outer surface of the drive motor under the action of the tangential zero-order spatial-order electromagnetic excitation;

[0038] Step 3.4) Calculate the structural sensitivity coefficient of the zero-order spatial-order electromagnetic excitation of the drive motor.

[0039] Preferably, step 3.2) includes the following steps:

[0040] Step 3.2.1) Set the excitation frequency of the applied radial zero-order spatial-order electromagnetic excitation load to THz to perform vibration excitation on the entire drive motor, record the average vibration velocity of all discretized triangular elements, and record them as v rT1 、v rT2 、...、v rTK , where K is the total number of discretized triangular elements, T is the excitation frequency, and T = 1Hz, 2Hz, 3Hz,..., 8000Hz;

[0041] Step 3.2.2) Calculate the total vibration energy of the outer surface of the drive motor at each excitation frequency under the action of the radial zero-order spatial-order electromagnetic excitation:

[0042]

[0043] In the formula: L rw-0-THz represents the total vibration energy of the outer surface of the entire drive motor calculated according to the radial zero-order spatial-order electromagnetic excitation under the condition that the excitation frequency is THz; Si is the area of the discretized triangular element;

[0044] Step 3.2.3) Calculate the noise caused by the vibration in step 3.2.2) according to the magnitude of the excitation frequency;

[0045] Step 3.3) includes the following steps:

[0046] Step 3.3.1) Set the excitation frequency of the applied tangential zero-order spatial-order electromagnetic excitation load to THz to perform vibration excitation on the entire drive motor, record the average vibration velocity of all discretized triangular elements, and record them as v tT1 、vtT2、...、vtTK;

[0047] Step 3.3.2) Calculate the total vibration energy of the outer surface of the drive motor at each excitation frequency under the action of the tangential zero-order spatial-order electromagnetic excitation:

[0048]

[0049] In the formula: Ltw-0-THz It represents the total vibration energy of the outer surface of the entire drive motor calculated according to the tangential zero-order space-order electromagnetic excitation under the condition that the excitation frequency is THz.

[0050] Step 3.3.3) Calculate the noise caused by the vibration in Step 3.3.2) according to the magnitude of the excitation frequency.

[0051] Preferably, in Step 3.2.3), the method for calculating the noise caused by the vibration in Step 3.2.2) according to the magnitude of the excitation frequency is as follows: When the excitation frequency T ≤ 2000 Hz, calculate the noise based on the following formula:

[0052] P rw-0-THz = L rw-0-1Hz -8 + log(T / 2000)

[0053] In the formula: P rw-0- represents the noise caused by the total vibration energy of the outer surface of the drive motor under the action of the radial zero-order space-order electromagnetic excitation when the excitation frequency is THz.

[0054] When the excitation frequency T > 2000 Hz, calculate the noise based on the following formula:

[0055] P rw-0-THz = L rw-0-THz -8;

[0056] In Step 3.3.3), the method for calculating the noise caused by the vibration in Step 3.2.2) according to the magnitude of the excitation frequency is as follows:

[0057] When the excitation frequency T ≤ 2000 Hz, calculate the noise based on the following formula:

[0058] P tw-0-THz = L tw-0-1Hz -8 + log(T / 2000)

[0059] In the formula: P tw-0-THz represents the noise caused by the total vibration energy of the outer surface of the drive motor under the action of the tangential zero-order space-order electromagnetic excitation when the excitation frequency is THz.

[0060] When the excitation frequency T > 2000 Hz, calculate the noise based on the following formula:

[0061] P tw-0-THz = L tw-0- -8;

[0062] In Step 3.4), calculate the sensitivity coefficient of the zero-order space-order electromagnetic excitation structure of the drive motor according to the following formula: DD0 =

[0063] 1.2 * average(P rw-0- T Hz ) + Max(P rw-0-THz ) + 0.8 * (1.2 * average(P tw-0-THz ) + Max(P tw-0-THz ))

[0064] In the formula: DD0 represents the sensitivity coefficient of the electromagnetic excitation structure of the zero - order spatial order of the drive motor.

[0065] Preferably, step 4) includes the following steps:

[0066] Step 4.1) Discretize the outer surface of the drive motor structure into triangular elements;

[0067] Step 4.2) Calculate the sensitivity coefficient DD6 of the electromagnetic excitation structure of the 6 - th order spatial order of the drive motor;

[0068] Step 4.3) Calculate the sensitivity coefficient DD8 of the electromagnetic excitation structure of the 8 - th order spatial order of the drive motor;

[0069] Step 4.4) Calculate the sensitivity coefficient DD of the electromagnetic excitation structure of the 12 - th order spatial order of the drive motor 12 ;

[0070] Step 4.5) Calculate the sensitivity coefficient DD of the electromagnetic excitation structure of the 24 - th order spatial order of the drive motor 24 ;

[0071] Step 4.6) Calculate the sensitivity coefficient of the electromagnetic excitation structure of the non - zero - order spatial order of the drive motor based on the following formula:

[0072] DD x = 0.2 * DD6 + 0.6 * DD8 + DD 12 + 2 * DD 24

[0073] In the formula: DD x is the calculated sensitivity coefficient of the electromagnetic excitation structure of the non - zero - order spatial order of the drive motor.

[0074] Preferably, step 4.2) includes the following steps:

[0075] Step 4.2.1) Set the excitation frequency of the applied radial 6 - th order spatial order electromagnetic excitation load to THz and perform vibration excitation on the entire drive motor, record the average vibration velocity of all discretized triangular elements, and record them as V 6rT1 、V 6rT2 、...、v 6rTK, where K is the total number of discretized triangular elements, T is the excitation frequency, and T = 1 Hz, 2 Hz, 3 Hz,..., 8000 Hz;

[0076] Step 4.2.2) Calculate the total vibration energy of the outer surface of the drive motor at each excitation frequency under the action of the electromagnetic excitation load of the 6th radial spatial order:

[0077]

[0078] In the formula: L rw-6-THz represents the total vibration energy of the entire outer surface of the drive motor calculated according to the electromagnetic excitation of the 6th radial spatial order under the condition that the excitation frequency is THz; Si is the area of the discretized triangular element;

[0079] Step 4.2.3) Calculate the noise caused by the vibration in Step 4.2.2):

[0080] When the excitation frequency T ≤ 2000 Hz, calculate the noise based on the following formula:

[0081] P rw-6-THz = L rw-6-1Hz -8 + log(T / 2000)

[0082] In the formula: P rw-6-THz represents the noise caused by the total vibration energy of the outer surface of the drive motor under the action of the electromagnetic excitation of the 6th radial spatial order when the excitation frequency is THz;

[0083] When the excitation frequency T > ......

[0084] P rw-6-THz = L rw-6-THz -8;

[0085] Step 4.2.4) Set the excitation frequency of the applied tangential 6th spatial order electromagnetic excitation load to THz to perform vibration excitation on the entire drive motor, record the average vibration velocity of all discretized triangular elements, and record them as V 6tT1 、V 6tT2 、...、v 6tTK ;

[0086] Step 4.2.5) Calculate the total vibration energy of the outer surface of the drive motor at each excitation frequency under the action of the tangential 6th spatial order electromagnetic excitation load:

[0087]

[0088] In the formula: Lt w-6-THzIt represents the total vibration energy of the outer surface of the entire driving motor calculated according to the tangential 6th-order spatial-order electromagnetic excitation under the condition that the excitation frequency is THz.

[0089] Step 4.2.6) Calculate the noise caused by vibration in Step 4.2.5):

[0090] When the excitation frequency T ≤ 2000 Hz, calculate the noise based on the following formula:

[0091] P tw-6-THz = L tw-6-1Hz -8 + log(T / 2000)

[0092] In the formula: P tw-6-THz represents the noise caused by the total vibration energy of the outer surface of the driving motor under the action of the tangential 6th-order spatial-order electromagnetic excitation when the excitation frequency is THz.

[0093] When the excitation frequency T > 2000 Hz, calculate the noise based on the following formula:

[0094] P tw-6-THz = L tw-6-THz -8;

[0095] In Step 4.2.7), calculate the structural sensitivity coefficient of the 6th-order spatial-order electromagnetic excitation of the driving motor according to the following formula:

[0096] DD6 =

[0097] 1.2 * average(Pr w-6-THz ) + Max(P rw-6-THz ) + 0.8 * (1.2 * average(P tw-6-THz ) + Max(P tw-6-THz ))

[0098] In the formula: DD6 represents the structural sensitivity coefficient of the 6th-order spatial-order electromagnetic excitation of the driving motor.

[0099] Preferably, Step 4.3) includes the following steps:

[0100] Step 4.3.1) Set the excitation frequency of the applied radial 8th-order spatial-order electromagnetic excitation load to THz to perform vibration excitation on the entire driving motor, record the average vibration velocity of all discretized triangular elements, and record them as V 8rT1 、V 8rT2 、...、v 8rTK , where K is the total number of discretized triangular elements, T is the excitation frequency, and T = 1 Hz, 2 Hz, 3 Hz,..., 8000 Hz;

[0101] Step 4.3.2) Calculate the total vibration energy of the outer surface of the drive motor at each excitation frequency under the action of the radial 8th-order spatial-order electromagnetic excitation load:

[0102]

[0103] where: L rw-8-THz represents the total vibration energy of the entire outer surface of the drive motor calculated according to the radial 8th-order spatial-order electromagnetic excitation under the condition that the excitation frequency is THz; Si is the area of the discretized triangular element;

[0104] Step 4.3.3) Calculate the noise caused by the vibration in Step 4.3.2):

[0105] When the excitation frequency T ≤ 2000 Hz, calculate the noise based on the following formula:

[0106] P rw-8-THz = L rw-8-1Hz -8 + log(T / 2000)

[0107] where: P rw-8-THz represents the noise caused by the total vibration energy of the outer surface of the drive motor under the action of the radial 8th-order spatial-order electromagnetic excitation when the excitation frequency is THz;

[0108] When the excitation frequency T > 2000 Hz, calculate the noise based on the following formula:

[0109] P rw-8-THz = L rw-8-THz -8;

[0110] Step 4.3.4) Set the excitation frequency of the applied tangential 8th-order spatial-order electromagnetic excitation load to THz to perform vibration excitation on the entire drive motor, record the average vibration velocity of all discretized triangular elements, and record them as V 8tT1 、V 8tT2 、...、v 8tTK ;

[0111] Step 4.3.5) Calculate the total vibration energy of the outer surface of the drive motor at each excitation frequency under the action of the tangential 8th-order spatial-order electromagnetic excitation load:

[0112]

[0113] where: L tw-8-THz represents the total vibration energy of the entire outer surface of the drive motor calculated according to the tangential 8th-order spatial-order electromagnetic excitation under the condition that the excitation frequency is THz;

[0114] Step 4.3.6) Calculate the noise caused by vibration in Step 4.3.5):

[0115] When the excitation frequency T ≤ 2000 Hz, calculate the noise based on the following formula:

[0116] P tw-8-THz = L tw-8-1Hz -8 + log(T / 2000)

[0117] In the formula: P tw-8-THz represents the noise caused by the total vibration energy on the outer surface of the drive motor under the action of the tangential 8th-order spatial-order electromagnetic excitation when the excitation frequency is THz;

[0118] When the excitation frequency T > 2000 Hz, calculate the noise based on the following formula:

[0119] P tw-8-THz = L tw-8-THz -8;

[0120] In Step 4.3.7), calculate the structural sensitivity coefficient of the 8th-order spatial-order electromagnetic excitation of the drive motor according to the following formula:

[0121] DD8 =

[0122] 1.2 * average(P rw-8-THz ) + Max(P rw-8-THz ) + 0.8 * (1.2 * average(P tw-8-THz ) + Max(P tw-8-THz )) In the formula: DD8 represents the structural sensitivity coefficient of the 8th-order spatial-order electromagnetic excitation of the drive motor.

[0123] Preferably, Step 4.4) includes the following steps:

[0124] Step 4.4.1) Set the excitation frequency of the applied radial 12th-order spatial-order electromagnetic excitation load to THz to perform vibration excitation on the entire drive motor, record the average vibration velocity of all discretized triangular elements, and record them as V 12rT1 、V 12rT2 、...、v 12rTK , where K is the total number of discretized triangular elements, T is the excitation frequency, and T = 1 Hz, 2 Hz, 3 Hz,..., 8000 Hz;

[0125] Step 4.4.2) Calculate the total vibration energy on the vibrating outer surface of the drive motor at each excitation frequency under the action of the radial 12th-order spatial-order electromagnetic excitation load:

[0126]

[0127] Where: L rw-12-THz represents the total vibration energy of the outer surface of the entire driving motor calculated according to the radial 12th-order spatial-order electromagnetic excitation under the condition that the excitation frequency is THz; Si is the area of the discretized triangular element;

[0128] Step 4.4.3) Calculate the noise caused by vibration in Step 4.4.2):

[0129] When the excitation frequency T ≤ 2000 Hz, calculate the noise based on the following formula:

[0130] P rw-12-TH = L rw-12-1Hz -8 + log(T / 2000)

[0131] Where: P rw-12-THz represents the noise caused by the total vibration energy of the outer surface of the driving motor under the action of the radial 12th-order spatial-order electromagnetic excitation when the excitation frequency is THz;

[0132] When the excitation frequency T > 2000 Hz, calculate the noise based on the following formula:

[0133] P rw-12-THz = L rw-12-THz -8;

[0134] Step 4.4.4) Set the excitation frequency of the applied tangential 12th-order spatial-order electromagnetic excitation load to THz to perform vibration excitation on the entire driving motor, record the average vibration velocity of all discretized triangular elements, and record them as V 12tT1 、V 12tT2 、...、v 12tTK ;

[0135] Step 4.4.5) Calculate the total vibration energy of the outer surface of the driving motor at each excitation frequency under the action of the tangential 12th-order spatial-order electromagnetic excitation load:

[0136]

[0137] Where: Lt w-12-TH represents the total vibration energy of the outer surface of the entire driving motor calculated according to the tangential 12th-order spatial-order electromagnetic excitation under the condition that the excitation frequency is THz;

[0138] Step 4.4.6) Calculate the noise caused by vibration in Step 4.4.5):

[0139] When the excitation frequency T ≤ 2000 Hz, calculate the noise based on the following formula:

[0140] P tw-12-THz = L tw-12-1Hz-8 + log(T / 2000)

[0141] Where: P tw-12-THz represents the noise caused by the total vibration energy on the outer surface of the drive motor under the action of the 12th-order tangential spatial-order electromagnetic excitation at the excitation frequency of THz;

[0142] When the excitation frequency T > 2000 Hz, the noise is calculated based on the following formula:

[0143] P tw-12-THz = L tw-12-THz -8;

[0144] In step 4.4.7), the sensitivity coefficient of the 12th-order spatial-order electromagnetic excitation structure of the drive motor is calculated according to the following formula:

[0145] DD 12 = 1.2 * average(P rw-12-THz ) + Max(P w-12-THz ) + 0.8 * (1.2 * average(P tw-12-THz ) + Max(P tw-12-THz ))

[0146] Where: DD 12 represents the sensitivity coefficient of the 12th-order spatial-order electromagnetic excitation structure of the drive motor.

[0147] Preferably, step 4.5) includes the following steps:

[0148] Step 4.5.1) Set the excitation frequency of the applied radial 24th-order spatial-order electromagnetic excitation load to THz to perform vibration excitation on the entire drive motor, and record the average vibration velocity of all discretized triangular elements, which are respectively recorded as V 24rT1 、V 24rT2 、...、v 24rTK , where K is the total number of discretized triangular elements, T is the excitation frequency, and T = 1 Hz, 2 Hz, 3 Hz,..., 8000 Hz;

[0149] Step 4.5.2) Calculate the total vibration energy of the outer surface of the drive motor under the action of the radial 24th-order spatial-order electromagnetic excitation load at each excitation frequency:

[0150]

[0151] Where: L rw-24-TrHz represents the total vibration energy of the outer surface of the entire drive motor calculated according to the radial 24th-order spatial-order electromagnetic excitation under the condition that the excitation frequency is THz; Si is the area of the discretized triangular element;

[0152] Step 4.5.3) Calculate the noise caused by vibration in Step 4.5.2):

[0153] When the excitation frequency T ≤ 2000 Hz, calculate the noise based on the following formula:

[0154] P rw-24-TrHz = L rw-24-1Hz -8 + log(T / 2000)

[0155] In the formula: P rw-24-THz represents the noise caused by the total vibration energy on the outer surface of the drive motor under the action of the radial 24th-order spatial-order electromagnetic excitation when the excitation frequency is THz;

[0156] When the excitation frequency T > 2000 Hz, calculate the noise based on the following formula:

[0157] P rw-24-THz = L rw-24-THz -8;

[0158] Step 4.5.4) Set the excitation frequency of the applied tangential 24th-order spatial-order electromagnetic excitation load to THz and perform vibration excitation on the entire drive motor, record the average vibration velocity of all discretized triangular elements, and record them as V 24tT1 、V 24tT2 、...、v 24tTK ;

[0159] Step 4.5.5) Calculate the total vibration energy of the outer surface of the drive motor under the action of the tangential 24th-order spatial-order electromagnetic excitation load at each excitation frequency:

[0160]

[0161] In the formula: Lt w-24-TH represents the total vibration energy of the outer surface of the entire drive motor calculated according to the tangential 24th-order spatial-order electromagnetic excitation under the condition that the excitation frequency is THz;

[0162] Step 4.5.6) Calculate the noise caused by vibration in Step 4.5.5):

[0163] When the excitation frequency T ≤ 2000 Hz, calculate the noise based on the following formula:

[0164] P tw-24-THz = L tw-2 4 - 1H -8 + log(T / 2000)

[0165] In the formula: P tw-24-THzIt represents the noise caused by the total vibration energy on the outer surface of the drive motor under the action of the 24th-order tangential spatial-order electromagnetic excitation when the excitation frequency is THz.

[0166] When the excitation frequency T > 2000 Hz, the noise is calculated based on the following formula:

[0167] P tw-24-THz = L tw-24-THz -8;

[0168] In step 4.5.7), the sensitivity coefficient of the 24th-order spatial-order electromagnetic excitation structure of the drive motor is calculated according to the following formula:

[0169] DD 24 = 1.2 * average(P rw-24-THz ) + Max(P rw-24-THz ) + 0.8 * (1.2 * average(P tw-24-THz ) + Max(P tw-24-THz )) In the formula: DD 24 represents the sensitivity coefficient of the 24th-order spatial-order electromagnetic excitation structure of the drive motor.

[0170] Preferably, in step 5), the response consistency coefficient of the multi-spatial-order electromagnetic excitation structure of the drive motor is calculated according to the following formula:

[0171] Tre = (DD0 - DD6) / (20 * Log(5)) + (DD0 - DD / 8 ) / (20 * Log(7)) + (DD0 - DD 12 ) / (20

[0172] * Log(11)) + (DD0 - DD 24 ) / (20 * Log(23))

[0173] In the formula: Tre represents the response consistency coefficient of the multi-spatial-order electromagnetic excitation structure of the drive motor.

[0174] Preferably, in step 6), the sensitivity coefficient of the drive motor structure - electromagnetic load excitation is calculated based on the following formula:

[0175] LMD = Tre + 1 / DD0 + 1 / DD x

[0176] In the formula: LMD represents the sensitivity coefficient of the drive motor structure - electromagnetic load excitation;

[0177] The sensitivity of the drive motor structure - electromagnetic load excitation is analyzed and evaluated according to the sensitivity coefficient of the drive motor structure - electromagnetic load excitation.

[0178] Preferably, step 7) includes the following steps:

[0179] Step 7.1): In the range of T1 to T2 Hz, calculate the average value of the noise caused by the radial zero-order spatial order electromagnetic force of the drive motor, the average value of the noise caused by the tangential zero-order spatial order electromagnetic force of the drive motor, and the average value of the bench noise target respectively. T1 = 1 Hz, 501 Hz, 1001 Hz, 1501 Hz..., 7501 Hz, and T2 - T1 = 499 Hz;

[0180] Step 7.2): Based on the average value of the noise caused by the radial zero-order spatial order electromagnetic force of the drive motor, the average value of the noise caused by the tangential zero-order spatial order electromagnetic force of the drive motor, and the average value of the bench noise target calculated in step 7.1), formulate the zero-order spatial order electromagnetic force target of the drive motor in the frequency range of T1 to T2 Hz.

[0181] Preferably, in step 7.1), the formula for calculating the average value of the noise caused by the radial zero-order spatial order electromagnetic force of the drive motor is:

[0182]

[0183] The formula for calculating the average value of the noise caused by the tangential zero-order spatial order electromagnetic force of the drive motor is:

[0184]

[0185] The formula for calculating the average value of the bench noise target is:

[0186]

[0187] In the formula: P rwave(T1～T2) is the average value of the noise caused by the radial zero-order spatial order electromagnetic force of the drive motor in the frequency range of T1 to T2 Hz, P twave(T1～T2) is the average value of the noise caused by the tangential zero-order spatial order electromagnetic force of the drive motor in the frequency range of T1 to T2 Hz, P tarave(T1～T2) is the average value of the bench noise target in the frequency range of T1 to T2 Hz, P tari represents the noise target value under the condition that the frequency is i Hz;

[0188] In step 7.2), when P rwave(T1～T2) - P twave(T1～T2) > 0 dB,

[0189] The radial zero-order spatial order electromagnetic force target P rwtar(T1～T2) = 10^((P tarave(Tr1～T2) - P rwmax(T1～T2) ) / 20) * 1000;

[0190] Tangential zero - order spatial - order electromagnetic force target P twta(T1～T2) = 1500 Pa;

[0191] Where: P rwmax(T1～T2) represents the maximum value of the noise caused by the radial zero - order spatial - order electromagnetic force in the frequency range of T1~T2 Hz;

[0192] When P rwave(T1～T2) - P twave(T1～T2) < - 6 dB,

[0193] the radial zero - order spatial - order electromagnetic force target P rwtar(T1～T2) = 5000 Pa;

[0194] The tangential zero - order spatial - order electromagnetic force target P twtar(T1～T2) = 10^((P tarave(T1～T2) - P twmax(T1～T2) ) / 20)*300;

[0195] Where: P twmax(T1～T2) represents the maximum value of the noise caused by the tangential zero - order spatial - order electromagnetic force in the frequency range of T1~T2 Hz;

[0196] When - 6 dB < P rwave(T1～T2) - P twave(T1～T2) < 0 dB,

[0197] the radial zero - order spatial - order electromagnetic force target P rwtar(T1～T2) = 10^(((P tarave(T1～T2) - 3)- P rwmax(T1～T2) ) / 20)*1000;

[0198] The tangential zero - order spatial - order electromagnetic force target P twtar(T1～T2) = 10^(((P tarave(T1～T2) - 3)- P twmax(T1～T2) ) / 20)*300.

[0199] Preferably, step 8) includes the following steps:

[0200] Step 8.1) Formulate the radial 6 - order spatial - order electromagnetic force target P rw6tar(T1～T2) and the tangential 6 - order spatial - order electromagnetic force target P tw6tar(T1～T2) ;

[0201] Step 8.2) Formulate the radial 8 - order spatial - order electromagnetic force target P rw8tar(T1～T2) and the tangential 8 - order spatial - order electromagnetic force target P tw8tar(T1～T2) ;

[0202] Step 8.3) Formulate the radial 12 - order spatial - order electromagnetic force target P rw12tar(T1～T2) and the tangential 12 - order spatial - order electromagnetic force target Ptw12tar(T1～T2) ;

[0203] Step 8.4) Set the target P of the radial 24th-order spatial harmonic electromagnetic force of the drive motor rw24tar(T1～T2) and the target P of the tangential 24th-order spatial harmonic electromagnetic force tw24tar(T1～T2) .

[0204] Preferably, step 8.1) includes the following steps:

[0205] Step 8.1.1) In the range of T1 to T2 Hz, calculate the average value of the noise caused by the radial 6th-order spatial harmonic electromagnetic force of the drive motor and the average value of the noise caused by the tangential 6th-order spatial harmonic electromagnetic force of the drive motor respectively;

[0206] Step 8.1.2) Set the target of the 6th-order spatial harmonic electromagnetic force of the drive motor in the frequency range of T1 to T2 Hz according to the average value of the noise caused by the radial 6th-order spatial harmonic electromagnetic force of the drive motor, the average value of the noise caused by the tangential 6th-order spatial harmonic electromagnetic force of the drive motor, and the average value of the bench noise target calculated in step 8.1.1);

[0207] Step 8.2) includes the following steps:

[0208] Step 8.2.1) In the range of T1 to T2 Hz, calculate the average value of the noise caused by the radial 8th-order spatial harmonic electromagnetic force of the drive motor and the average value of the noise caused by the tangential 8th-order spatial harmonic electromagnetic force of the drive motor respectively;

[0209] Step 8.2.2) Set the target of the 8th-order spatial harmonic electromagnetic force of the drive motor in the frequency range of T1 to T2 Hz according to the average value of the noise caused by the radial 8th-order spatial harmonic electromagnetic force of the drive motor, the average value of the noise caused by the tangential 8th-order spatial harmonic electromagnetic force of the drive motor, and the average value of the bench noise target calculated in step 8.2.1);

[0210] Step 8.3) includes the following steps:

[0211] Step 8.3.1) In the range of T1 to T2 Hz, calculate the average value of the noise caused by the radial 12th-order spatial harmonic electromagnetic force of the drive motor and the average value of the noise caused by the tangential 12th-order spatial harmonic electromagnetic force of the drive motor respectively;

[0212] Step 8.3.2) Set the target of the 12th-order spatial harmonic electromagnetic force of the drive motor in the frequency range of T1 to T2 Hz according to the average value of the noise caused by the radial 12th-order spatial harmonic electromagnetic force of the drive motor, the average value of the noise caused by the tangential 12th-order spatial harmonic electromagnetic force of the drive motor, and the average value of the bench noise target calculated in step 8.3.1);

[0213] Step 8.4) includes the following steps:

[0214] Step 8.4.1) In the range of T1 to T2 Hz, calculate the average value of the noise caused by the 24th-order spatial harmonic electromagnetic force in the radial direction of the drive motor and the average value of the noise caused by the 24th-order spatial harmonic electromagnetic force in the tangential direction of the drive motor, respectively.

[0215] Step 8.4.2) Based on the average value of the noise caused by the 24th-order spatial harmonic electromagnetic force in the radial direction of the drive motor, the average value of the noise caused by the 24th-order spatial harmonic electromagnetic force in the tangential direction of the drive motor, and the average value of the bench noise target calculated in Step 8.4.1), formulate the 24th-order spatial harmonic electromagnetic force target of the drive motor in the frequency range of T1 to T2 Hz.

[0216] Preferably, in Step 8.1.1), the calculation formula for the average value of the noise caused by the 6th-order spatial harmonic electromagnetic force in the radial direction of the drive motor is:

[0217]

[0218] The calculation formula for the average value of the noise caused by the 6th-order spatial harmonic electromagnetic force in the tangential direction of the drive motor is:

[0219]

[0220] Where: P rw6a(T1～T2) is the average value of the noise caused by the 6th-order spatial harmonic electromagnetic force in the radial direction of the drive motor in the frequency range of T1 to T2 Hz, and P tw6ave(T1～T2) is the average value of the noise caused by the 6th-order spatial harmonic electromagnetic force in the tangential direction of the drive motor in the frequency range of T1 to T2 Hz;

[0221] In Step 8.1.2), when P rw6ave(T1～T2) - P tw6ave(T1～T2) > 2 dB,

[0222] the radial 6th-order spatial harmonic electromagnetic force target P rw6tar(T1～T2) = 10^((P tarave(T1～T2) - P rw6(T1～T2) ) / 40) * 20000;

[0223] the tangential 6th-order spatial harmonic electromagnetic force target P tw6tar(T1～T2) = 1500 * 6^2 Pa;

[0224] Where: P rw6max(T1～T2) represents the maximum value of the noise caused by the 6th-order spatial harmonic electromagnetic force in the radial direction in the frequency range of T1 to T2 Hz;

[0225] When P rw6ave(T1～T2) - P tw6ave(T1～T2) < -4 dB,

[0226] the radial 6th-order spatial harmonic electromagnetic force target Prw6tar(T1～T2) = 5000 * 6^Pa;

[0227] Tangential 6th-order spatial-order electromagnetic force target P tw6tar(T1～T2) = 10^((P tarave(T1～T2) - P tw6max(T1～T2) ) / 40) * 8000;

[0228] When -4dB < P rw6ave(T11～T2) - P tw6ave(T1～T2) < 2dB,

[0229] Radial 6th-order spatial-order electromagnetic force target

[0230] P rw6tar(T1～T2) = 10^(((P tarave(T1～T2) - 3) - P rw6ave(T1～T2) ) / 40) * 20000;

[0231] Tangential 6th-order spatial-order electromagnetic force target P tw6tar(T1～T2) = 10^(((P tarave(T1～T2) - 3) - P tw6av(T1～T2) ) / 40) * 8000;

[0232] In step 8.2.1), the formula for calculating the average value of the noise caused by the radial 8th-order spatial-order electromagnetic force of the drive motor is:

[0233]

[0234] The formula for calculating the average value of the noise caused by the tangential 8th-order spatial-order electromagnetic force of the drive motor is:

[0235]

[0236] In the formula: P rw8ave(T1～T2) is the average value of the noise caused by the radial 8th-order spatial-order electromagnetic force of the drive motor in the frequency range of T1 ~ T2Hz, P tw8ave(T1～T2) is the average value of the noise caused by the tangential 8th-order spatial-order electromagnetic force of the drive motor in the frequency range of T1 ~ T2Hz;

[0237] In step 8.2.2), when P rw8ave(T1～T2) - P tw8ave(T1～T2) > 2dB,

[0238] Radial 8th-order spatial-order electromagnetic force target P rw8tar(T1～T2) = 10^((P tarave(T1～T2) - P rw8max(T1～T2) ) / 40) * 20000;

[0239] Tangential 8th-order spatial-order electromagnetic force target P tw8(T1～T2) = 1500 * 6^2Pa;

[0240] Where: P rw8max(T1～T2) represents the maximum value of the noise caused by the radial 8th-order spatial harmonic electromagnetic force in the frequency range of T1 to T2 Hz;

[0241] When P rw8ave(T1～T2) -P tw8ave(T1～T2) <-4 dB,

[0242] the target P of the radial 8th-order spatial harmonic electromagnetic force rw8tar(T1～T2) = 5000 * 6^2 Pa;

[0243] the target P of the tangential 8th-order spatial harmonic electromagnetic force tw8t(T1～T2) = 10^((P tarave(T1～T2) -P tw8max(T1～T2) ) / 40) * 8000;

[0244] When -4 dB < P rw8ave(T11～T2) -P tw8ave(T1～T2) < 2 dB,

[0245] the target P of the radial 8th-order spatial harmonic electromagnetic force rw8tar(T1～T2) = 10^(((P tarave(T1～T2) - 3) - P rw8ave(T1～T2) ) /

[0246] 40) * 20000

[0247] the target P of the tangential 8th-order spatial harmonic electromagnetic force tw8tar(T1～T2) = 10^(((P tarave(T1～T2) - 3) - P tw(T1～T2) ) / 40) * 8000; In step 8.3.1), the formula for calculating the average value of the noise caused by the radial 12th-order spatial harmonic electromagnetic force of the drive motor is:

[0248]

[0249] The formula for calculating the average value of the noise caused by the tangential 12th-order spatial harmonic electromagnetic force of the drive motor is:

[0250]

[0251] Where: P rw12ave(T1～T2) is the average value of the noise caused by the radial 12th-order spatial harmonic electromagnetic force of the drive motor in the frequency range of T1 to T2 Hz, and P tw12ave(T1～T2) is the average value of the noise caused by the tangential 12th-order spatial harmonic electromagnetic force of the drive motor in the frequency range of T1 to T2 Hz;

[0252] In step 8.3.2), when P rw12ave(T1～T2) -P tw12ave(T1～T2) > 2 dB,

[0253] Radial 12th-order spatial harmonic electromagnetic force target P rw12tar(T1～T2) = 10^((P tarave(T1～T2) - P rw12max(T1～T2) ) / 40) * 20000;

[0254] Tangential 12th-order spatial harmonic electromagnetic force target P tw12tar(T1～T2) = 1500 * 6^2 Pa;

[0255] Where: P rw12max(T1～T2) represents the maximum value of the noise caused by the radial 12th-order spatial harmonic electromagnetic force in the frequency range of T1 to T2 Hz;

[0256] When P rw12ave(T1～T2) - P tw12ave(T1～T2) < -4 dB,

[0257] Radial 12th-order spatial harmonic electromagnetic force target P rw12tar(T1～T2) = 5000 * 6^2 Pa;

[0258] Tangential 12th-order spatial harmonic electromagnetic force target P tw12t(T1～T2) = 10^((P tarave(T1～T2) - P tw12max(T1～T2) ) / 40) * 8000;

[0259] When -4 dB < P rw12ave(T11～T2) - P tw12ave(T1～T2) < 2 dB,

[0260] Radial 12th-order spatial harmonic electromagnetic force target P rw12tar(T1～T2) = 10^(((P tarave(T1～T2) - 3) - P rw12ave(T1～T2) ) / 40) * 20000;

[0261] Tangential 12th-order spatial harmonic electromagnetic force target P tw12tar(T1～T2) = 10^(((P tarave(T1～T2) - 3) - P tw12ave(T1～T2) ) / 40) * 8000;

[0262] In step 8.4.1), the formula for calculating the average value of the noise caused by the radial 24th-order spatial harmonic electromagnetic force of the drive motor is:

[0263]

[0264] The formula for calculating the average value of the noise caused by the tangential 24th-order spatial harmonic electromagnetic force of the drive motor is:

[0265]

[0266] Where: P rw24ave(T1～T2)is the average value of the noise caused by the radial 24th-order space-order electromagnetic force of the drive motor in the frequency range of T1 to T2 Hz, P tw24ave(T1～T2) is the average value of the noise caused by the tangential 24th-order space-order electromagnetic force of the drive motor in the frequency range of T1 to T2 Hz;

[0267] In step 8.4.2), when P rw24ave(T1～T2) -P tw24ave(T1～T2) > 2 dB,

[0268] The target P of the radial 24th-order space-order electromagnetic force rw24tar(T1～T2) = 10^((P tarave(T1～T2) -P rw24max(T1～T2) ) / 40) * 20000;

[0269] The target P of the tangential 24th-order space-order electromagnetic force tw24t(T1～T2) = 1500 * 6^2 Pa;

[0270] Where: P tw24max(T1～T2) represents the maximum value of the noise caused by the radial 24th-order space-order electromagnetic force in the frequency range of T1 to T2 Hz;

[0271] When P rw24ave(T1～T2) -P tw24ave(T1～T2) < -4 dB,

[0272] The target P of the radial 24th-order space-order electromagnetic force rw24tar(T1～T2) = 5000 * 6^2 Pa;

[0273] The target P of the tangential 24th-order space-order electromagnetic force tw24tar(T1～T2) = 10^((P tarave(T1～T2) -P tw24max(T1～T2) ) / 40) * 8000;

[0274] When -4 dB < P rw24ave(T11～T2) -P tw24ave(T1～T2) < 2 dB,

[0275] The target P of the radial 24th-order space-order electromagnetic force rw24tar(T1～T2) = 10^(((P tarave(T1～T2) - 3) - P rw24ave(T1～T2) ) / 40) * 20000;

[0276] The target P of the tangential 24th-order space-order electromagnetic force tw24tar(T1～T2) = 10^(((P tarave(T1～T2) - 3) - P tw24ave(T1～T2) ) / 40) * 8000.

[0277] Preferably, in step 9), the calculation formula for the electromagnetic force risk coefficient of the drive motor is:

[0278] LME = Max(Prwsmax(T1～T2) / P rwtar(T1～T2) ) + Max(P twsmax(T1～T2) / P twtar(T1～T2) + Max(P rws6max(T1～T2) / P rw6tar(T1～T2 ) + Max(P tws6max(T1～T2) / P tw6tar(T1～T2) + Max(P rws8max(T1～T2) / P rw8tar(T1～T2 ) + Max(P tws8max(T1～T2) / P tw8tar(T1～T2) ) + Max(P rws12max(T1～T2) / P rw12tar(T1～T2 ) + Max(P tws12max(T1～T2) / P tw12tar(T1～T2) ) + Max(P rws24max(T1～T2) / P rw24ar(T1～T2 ) + Max(P tws24max(T1～T2) / P tw24tar(T1～T2) )

[0279] Where: LME represents the motor electromagnetic force risk coefficient, P rwsmax(T1～T2) represents the maximum value of the noise caused by the actual radial zero-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz; P twsmax(T1～T2) represents the maximum value of the noise caused by the actual tangential zero-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz; P rws6max(T1～T2) represents the maximum value of the noise caused by the actual radial 6th-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz; P tws6max(T1～T2) represents the maximum value of the noise caused by the actual tangential 6th-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz; P rws8max(T1～T2) represents the maximum value of the noise caused by the actual radial 8th-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz; P tws8max(T1～T2) represents the maximum value of the noise caused by the actual tangential 8th-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz; P rws12max(T1～T2) represents the maximum value of the noise caused by the actual radial 12th-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz; P tws12max(T1～T2) represents the maximum value of the noise caused by the actual tangential 12th-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz; P rws24max(T1～T2) represents the maximum value of the noise caused by the actual radial 24th-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz; P tws24max(T1～T2) represents the maximum value of the noise caused by the actual tangential 24th-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz.

[0280] Compared with the prior art, the present invention provides methods for applying loads of electromagnetic forces of different spatial orders, a method for quickly calculating the noise caused by the vibration of a drive motor, a method for evaluating and analyzing the structural sensitivity performance of a drive motor assembly, a method for formulating electromagnetic force targets of the same spatial order, a method for evaluating the vibration and noise risk of the structural part of a drive motor, a method for formulating electromagnetic force targets of different spatial orders, and a method for evaluating the design risk of a drive motor based on electromagnetic forces. Therefore, without a physical prototype and without test vehicle / bench resources, based on the overall electromagnetic noise target formulated in the early stage and the pole-slot combination of the drive motor, the present invention can quickly evaluate the structural sensitivity of the drive motor housing, identify the risk frequency bands where noise may occur; at the same time, by precisely defining the electromagnetic force design targets of the spatial zero order and non-zero order of the drive motor, the forward design and development of the electromagnetic scheme in the drive motor are realized, the development cycle is shortened, the test cost is reduced, and the one-time success rate of development is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0281] Appendix Figure 1 FIG. is a schematic diagram of a drive motor assembly in the method for analyzing the structural sensitivity and spatial order electromagnetic force target of a drive motor for a new energy vehicle according to the present invention;

[0282] Appendix Figure 2 FIG. is a schematic diagram of a drive motor stator structure in the method for analyzing the structural sensitivity and spatial order electromagnetic force target of a drive motor for a new energy vehicle according to the present invention;

[0283] Appendix Figure 3 FIG. is a schematic diagram of the application of a radial zero-order spatial order electromagnetic excitation load in the method for analyzing the structural sensitivity and spatial order electromagnetic force target of a drive motor for a new energy vehicle according to the present invention;

[0284] Appendix Figure 4 FIG. is a schematic diagram of the application of a tangential zero-order spatial order electromagnetic excitation load in the method for analyzing the structural sensitivity and spatial order electromagnetic force target of a drive motor for a new energy vehicle according to the present invention;

[0285] Appendix Figure 5 FIG. is a schematic diagram of the application of a radial 6th-order spatial order electromagnetic excitation load in the method for analyzing the structural sensitivity and spatial order electromagnetic force target of a drive motor for a new energy vehicle according to the present invention;

[0286] Appendix Figure 6 FIG. is a schematic diagram of the application of a tangential 6th-order spatial order electromagnetic excitation load in the method for analyzing the structural sensitivity and spatial order electromagnetic force target of a drive motor for a new energy vehicle according to the present invention;

[0287] Appendix Figure 7 FIG. is a schematic diagram of the application of a radial 8th-order spatial order electromagnetic excitation load in the method for analyzing the structural sensitivity and spatial order electromagnetic force target of a drive motor for a new energy vehicle according to the present invention;

[0288] AppendixFigure 8 Schematic diagram of applying tangential 8th-order spatial-order electromagnetic excitation load in the method for analyzing the structural sensitivity and spatial-order electromagnetic force target of the drive motor of a new energy vehicle according to the present invention;

[0289] Appendix Figure 9 Schematic diagram of applying radial 12th-order spatial-order electromagnetic excitation load in the method for analyzing the structural sensitivity and spatial-order electromagnetic force target of the drive motor of a new energy vehicle according to the present invention;

[0290] Appendix Figure 10 Schematic diagram of applying tangential 12th-order spatial-order electromagnetic excitation load in the method for analyzing the structural sensitivity and spatial-order electromagnetic force target of the drive motor of a new energy vehicle according to the present invention;

[0291] Appendix Figure 11 Schematic diagram of applying radial 24th-order spatial-order electromagnetic excitation load in the method for analyzing the structural sensitivity and spatial-order electromagnetic force target of the drive motor of a new energy vehicle according to the present invention;

[0292] Appendix Figure 12 Schematic diagram of applying tangential 24th-order spatial-order electromagnetic excitation load in the method for analyzing the structural sensitivity and spatial-order electromagnetic force target of the drive motor of a new energy vehicle according to the present invention;

[0293] Appendix Figure 13 Schematic diagram of the surface of the discrete drive motor assembly in the method for analyzing the structural sensitivity and spatial-order electromagnetic force target of the drive motor of a new energy vehicle according to the present invention;

[0294] Appendix Figure 14 Schematic diagram of the noise curve caused by the radial zero-order spatial-order electromagnetic excitation load in the method for analyzing the structural sensitivity and spatial-order electromagnetic force target of the drive motor of a new energy vehicle according to the present invention;

[0295] Appendix Figure 15 Schematic diagram of the noise curve caused by the tangential zero-order spatial-order electromagnetic excitation load in the method for analyzing the structural sensitivity and spatial-order electromagnetic force target of the drive motor of a new energy vehicle according to the present invention;

[0296] Appendix Figure 16 Schematic diagram of the noise curves caused by the radial 6th, 8th, 12th, and 24th-order spatial-order electromagnetic excitation loads in the method for analyzing the structural sensitivity and spatial-order electromagnetic force target of the drive motor of a new energy vehicle according to the present invention;

[0297] Appendix Figure 17 Schematic diagram of the noise curves caused by the tangential 6th, 8th, 12th, and 24th-order spatial-order electromagnetic excitation loads in the method for analyzing the structural sensitivity and spatial-order electromagnetic force target of the drive motor of a new energy vehicle according to the present invention;

[0298] Appendix Figure 18This is the electromagnetic noise target curve in the method for analyzing the structural sensitivity and spatial order electromagnetic force target of the drive motor of a new energy vehicle according to the present invention;

[0299] Appendix Figure 19 This is the radial spatial zero-order electromagnetic force curve calculated according to the actual motor design scheme;

[0300] Appendix Figure 20 This is the tangential spatial zero-order electromagnetic force curve calculated according to the actual motor design scheme;

[0301] Appendix Figure 21 This is the radial spatial 8th-order electromagnetic force curve calculated according to the actual motor design scheme;

[0302] Appendix Figure 22 This is the tangential spatial 8th-order electromagnetic force curve calculated according to the actual motor design scheme. Specific embodiments

[0303] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention claimed, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0304] In this specific embodiment, a method for analyzing the structural sensitivity and spatial order electromagnetic force target of a drive motor of a new energy vehicle is provided. The drive motor assembly used in this specific embodiment is as shown in Appendix Figure 1 shown, and the drive motor stator structure is as shown in Appendix Figure 2 shown. In this specific embodiment, an 8-pole 72-slot product is used, and the number of stator teeth in the stator structure is 72 in total in the circumferential direction. Specifically, this method includes the following steps:

[0305] Step 1) Apply a zero-order spatial order electromagnetic excitation load to the drive motor;

[0306] Step 2) Apply a non-zero-order spatial order electromagnetic excitation load to the drive motor;

[0307] Step 3) Calculate the structural sensitivity coefficient of the zero-order spatial order electromagnetic excitation of the drive motor;

[0308] Step 4) Calculate the structural sensitivity coefficient of the non-zero-order spatial order electromagnetic excitation of the drive motor;

[0309] Step 5) Calculate the consistency coefficient of the structural responses of the driving motor under multi - spatial - order electromagnetic excitations;

[0310] Step 6) Analyze and evaluate the sensitivity of the driving - motor structure to electromagnetic - load excitations;

[0311] Step 7) Set the design target for the zero - order spatial - order electromagnetic force of the driving motor;

[0312] Step 8) Set the design target for the non - zero - order spatial - order electromagnetic force of the driving motor;

[0313] Step 9) Calculate the risk coefficient of the electromagnetic force of the driving motor.

[0314] Next, each step will be described in detail:

[0315] Step 1) Apply the zero - order spatial - order electromagnetic excitation load to the driving motor. In this specific embodiment, the zero - order spatial - order electromagnetic excitation load is defined as follows: The electromagnetic forces acting on all stator teeth in the circumferential direction of the stator satisfy the following conditions: the amplitudes are the same, and the phases are the same. Secondly, taking the center of the stator assembly of the driving motor as the origin, the stator diameter direction as the radial direction, and the tangent direction of the stator outer edge as the tangential direction, a cylindrical coordinate system is established. If there are N teeth in the circumferential direction of the stator tooth part, and their numbers are recorded as A1, A2,... An. In this specific embodiment, there are 72 stator teeth.

[0316] Step 1) specifically includes the method of applying the radial zero - order spatial - order electromagnetic excitation load and the method of applying the tangential zero - order spatial - order electromagnetic excitation load:

[0317] The method of applying the radial zero - order spatial - order electromagnetic excitation load is as follows: Apply an electromagnetic force load of 1 N along the radial direction of the cylindrical coordinate system to each stator tooth of the driving motor in sequence, and all the electromagnetic force loads in the radial direction have the same phase; In this specific embodiment, apply an electromagnetic excitation load of 1 N along the radial direction of the cylindrical coordinate system to the stator teeth A1, A2,... A72 in sequence, and ensure that all the loads have the same phase, that is, the application of the radial zero - order spatial - order electromagnetic excitation load is completed. The electromagnetic load after loading is as shown in the appendix Figure 3 as shown.

[0318] The method of applying the tangential zero - order spatial - order electromagnetic excitation load is as follows: Apply an electromagnetic force load of 1 N along the tangential direction of the cylindrical coordinate system to each stator tooth of the driving motor in sequence, and all the electromagnetic force loads in the tangential direction have the same phase. In this specific embodiment, apply an electromagnetic excitation load of 1 N along the tangential direction of the cylindrical coordinate system to the stator teeth A1, A2,... A72 in sequence, and ensure that all the loads have the same phase, that is, the application of the tangential zero - order spatial - order electromagnetic excitation load is completed. The electromagnetic load after loading is as shown in the appendix Figure 4 as shown.

[0319] Step 2) Apply a non-zero order spatial order electromagnetic excitation load to the drive motor. Definition of the non-zero order spatial order electromagnetic excitation load: The spatial X-order (X = 6, 8, 12, 24 in this invention patent) electromagnetic force means dividing the 360° circumferential range of the stator teeth into X equal parts, each part corresponding to a spatial angle = 360° / X, and each part of the space corresponding to N / X teeth. The electromagnetic forces on all stator teeth in this part of the space satisfy the following conditions: the amplitudes are the same, and the phase difference between any two stator teeth =

[0320] Specifically, step 2) includes a 6th-order spatial order electromagnetic excitation load application method, an 8th-order spatial order electromagnetic force excitation load application method, a 12th-order spatial order electromagnetic excitation load application method, and a 24th-order spatial order electromagnetic excitation load application method. (The number of stator teeth of the generator is a multiple of 24).

[0321] The 6th-order spatial order electromagnetic excitation load application method includes a radial 6th-order spatial order electromagnetic excitation load application method and a tangential 6th-order spatial order electromagnetic excitation load application method.

[0322] The radial 6th-order spatial order electromagnetic excitation load application method is as follows: Divide the N stator teeth within the 360° circumferential range into 6 equal parts, each part of the space corresponding to N / 6 stator teeth. Apply an electromagnetic force load of 1N along the radial direction of the cylindrical coordinate system to the stator teeth of the drive motor in sequence, and the phase difference between the electromagnetic forces applied between adjacent two stator teeth within each part of the space is 360° / 12 = 30°. Specifically, in this embodiment, each part of the space corresponds to 12 stator teeth. Apply a load of 1N along the radial direction of the cylindrical coordinate system to the stator teeth A1, A2,..., A72 in sequence. The phase of the first stator tooth is 0°, the phase of the second stator tooth is 360° / 12, the phase of the third stator tooth is 360° / 12 * 2,..., the phase of the 12th stator tooth is 360° / 12 * 11. The phase of the 13th stator tooth is 0°, the phase of the 14th stator tooth is 360° / 12,..., the phase of the 24th stator tooth is 360° / 12 * 11. And so on until all the stator tooth loads are applied completely, that is, the application of the radial 6th-order spatial order electromagnetic excitation load is completed. The electromagnetic load after loading is as shown in the appendix Figure 5 as shown.

[0323] The method for applying the tangential 6th-order spatial-order electromagnetic excitation load is as follows: Divide the N stator teeth within the 360° circumferential range into 6 equal parts, with each spatial part corresponding to N / 6 stator teeth. Apply an electromagnetic force load of 1N tangentially along the stator teeth of the driving motor in sequence, and the phase difference of the electromagnetic force between adjacent two stator teeth within each spatial part is 360° / 12 = 30°. Specifically, in this embodiment, each spatial part corresponds to 12 stator teeth. Apply a load of 1N tangentially along the stator teeth A1, A2,..., A72 in sequence in the cylindrical coordinate system. The phase of the first stator tooth is 0°, the phase of the second stator tooth is 360° / 12, the phase of the third stator tooth is 360° / 12 * 2,..., and the phase of the 12th stator tooth is 360° / 12 * 11. The phase of the 13th stator tooth is 0°, the phase of the 14th stator tooth is 360° / 12,..., and the phase of the 24th stator tooth is 360° / 12 * 11. And so on until all the stator tooth loads are applied completely, that is, the application of the tangential 6th-order spatial-order electromagnetic excitation load is completed. The electromagnetic load after loading is as shown in the appendix Figure 6 as shown.

[0324] The method for applying the 8th-order spatial-order electromagnetic excitation load includes the method for applying the radial 8th-order spatial-order electromagnetic excitation load and the method for applying the tangential 8th-order spatial-order electromagnetic excitation load.

[0325] The method for applying the radial 8th-order spatial-order electromagnetic excitation load is as follows: Divide the N stator teeth within the 360° circumferential range into 8 equal parts, with each spatial part corresponding to N / 8 stator teeth. Apply an electromagnetic force load of 1N radially along the stator teeth of the driving motor in sequence, and the phase difference of the electromagnetic force between adjacent two stator teeth within each spatial part is 360° / 9 = 40°. Specifically, in this embodiment, each spatial part corresponds to 9 stator teeth. Apply a load of 1N radially along the stator teeth A1, A2,..., A72 in sequence in the cylindrical coordinate system. The phase of the first stator tooth is 0°, the phase of the second stator tooth is 360° / 9, the phase of the third stator tooth is 360° / 9 * 2,..., and the phase of the 9th stator tooth is 360° / 9 * 8. The phase of the 10th stator tooth is 0°, the phase of the 11th stator tooth is 360° / 9,..., and the phase of the 18th stator tooth is 360° / 9 * 8. And so on until all the stator tooth loads are applied completely, that is, the application of the radial 8th-order spatial-order electromagnetic excitation load is completed. The electromagnetic load after loading is as shown in the appendix Figure 7 as shown.

[0326] The method for applying the tangential 8th-order spatial-order electromagnetic excitation load is as follows: Divide the N stator teeth within the 360° circumferential range into 8 equal parts, with each part of the space corresponding to N / 8 stator teeth. Apply an electromagnetic force load of 1N tangentially along the stator teeth of the drive motor in sequence, and the phase difference of the electromagnetic force applied between adjacent two stator teeth within each part of the space is 360° / 9 = 40°. Specifically, in this embodiment, each part of the space corresponds to 9 stator teeth. Apply a load of 1N tangentially along the stator teeth A1, A2,..., A72 in sequence. The phase of the first stator tooth is 0°, the phase of the second stator tooth is 360° / 9, the phase of the third stator tooth is 360° / 9 * 2,..., and the phase of the 9th stator tooth is 360° / 9 * 8. The phase of the 10th stator tooth is 0°, the phase of the 11th stator tooth is 360° / 9,..., and the phase of the 18th stator tooth is 360° / 9 * 8. And so on until all the stator tooth loads are applied completely, that is, the application of the tangential 8th-order spatial-order electromagnetic excitation load is completed. The electromagnetic load after loading is as shown in the appendix Figure 8 as shown.

[0327] The method for applying the 12th-order spatial-order electromagnetic excitation load includes the method for applying the radial 12th-order spatial-order electromagnetic excitation load and the method for applying the tangential 12th-order spatial-order electromagnetic excitation load.

[0328] The method for applying the radial 12th-order spatial-order electromagnetic excitation load is as follows: Divide the N stator teeth within the 360° circumferential range into 12 equal parts, with each part of the space corresponding to N / 12 stator teeth. Apply an electromagnetic force load of 1N radially along the stator teeth of the drive motor in sequence, and the phase difference of the electromagnetic force applied between adjacent two stator teeth within each part of the space is 360° / 6 = 60°. Specifically, in this embodiment, each part of the space corresponds to 6 stator teeth. Apply a load of 1N radially along the stator teeth A1, A2,..., A72 in sequence. The phase of the first stator tooth is 0°, the phase of the second stator tooth is 360° / 6, the phase of the third stator tooth is 360° / 6 * 2,..., and the phase of the 6th stator tooth is 360° / 6 * 5. The phase of the 7th stator tooth is 0°, the phase of the 8th stator tooth is 360° / 6,..., and the phase of the 12th stator tooth is 360° / 6 * 5. And so on until all the stator tooth loads are applied completely, that is, the application of the radial 12th-order spatial-order electromagnetic excitation load is completed. The electromagnetic load after loading is as shown in the appendix Figure 9 as shown.

[0329] The method for applying the tangential 12th - order spatial - order electromagnetic excitation load is as follows: Divide the N stator teeth within the 360° circumferential range into 12 equal parts. Each part of the space corresponds to N / 12 stator teeth. Apply an electromagnetic force load of 1N tangentially along the stator teeth of the drive motor in the cylindrical coordinate system. And the phase difference of the electromagnetic force applied between adjacent two stator teeth within each part of the space is 360° / 6 = 60°. Specifically, in this embodiment, each part of the space corresponds to 6 stator teeth. Apply a load of 1N tangentially along the stator teeth A1, A2,..., A72 in the cylindrical coordinate system. The phase of the first stator tooth is 0°, the phase of the second stator tooth is 360° / 6, the phase of the third stator tooth is 360° / 6*2,..., the phase of the 6th stator tooth is 360° / 6*5. The phase of the 7th stator tooth is 0°, the phase of the 8th stator tooth is 360° / 6,..., the phase of the 12th stator tooth is 360° / 6*5. And so on until all the stator tooth loads are applied completely, that is, the application of the tangential 12th - order spatial - order electromagnetic excitation load is completed. The electromagnetic load after loading is as shown in the appendix Figure 10 as shown

[0330] The method for applying the 24th - order spatial - order electromagnetic excitation load includes the method for applying the radial 24th - order spatial - order electromagnetic excitation load and the method for applying the tangential 24th - order spatial - order electromagnetic excitation load.

[0331] The method for applying the radial 24th - order spatial - order electromagnetic excitation load is as follows: Divide the N stator teeth within the 360° circumferential range into 24 equal parts. Each part of the space corresponds to N / 24 stator teeth. Apply an electromagnetic force load of 1N radially along the stator teeth of the drive motor in the cylindrical coordinate system. And the phase difference of the electromagnetic force applied between adjacent two stator teeth within each part of the space is 360° / 3 = 120°. Specifically, in this embodiment, each part of the space corresponds to 3 stator teeth. Apply a load of 1N radially along the stator teeth A1, A2,..., A72 in the cylindrical coordinate system. The phase of the first stator tooth is 0°, the phase of the second stator tooth is 360° / 3, the phase of the third stator tooth is 360° / 3*2. The phase of the 4th stator tooth is 0°, the phase of the 5th stator tooth is 360° / 3, the phase of the 6th stator tooth is 360° / 3*2. And so on until all the stator tooth loads are applied completely, that is, the application of the radial 24th - order spatial - order electromagnetic excitation load is completed. The electromagnetic load after loading is as shown in the appendix Figure 11 as shown

[0332] The method for applying the tangential 24th-order spatial-order electromagnetic excitation load is as follows: Divide N stator teeth within the 360° circumferential range into 24 equal parts, with each part of the space corresponding to N / 24 stator teeth. Apply an electromagnetic force load of 1N tangentially along the stator teeth of the drive motor in sequence, and the phase difference of the electromagnetic force between adjacent two stator teeth applied within each part of the space is 360° / 3 = 120°. Specifically, in this embodiment, each part of the space corresponds to 3 stator teeth. Apply a load of 1N tangentially along the stator teeth A1, A2,..., A72 in sequence in the cylindrical coordinate system. The phase of the first stator tooth is 0°, the phase of the second stator tooth is 360° / 3, and the phase of the third stator tooth is 360° / 3*2. The phase of the 4th stator tooth is 0°, the phase of the 5th stator tooth is 360° / 3, and the phase of the 6th stator tooth is 360° / 3*2. And so on until all the stator tooth loads are applied, that is, the application of the tangential 24th-order spatial-order electromagnetic excitation load is completed. The electromagnetic load after loading is as shown in the appendix Figure 12 as shown.

[0333] Step 3) Calculate the structural sensitivity coefficient of the zero-order spatial-order electromagnetic excitation of the drive motor.

[0334] Step 3.1) Discretize the outer surface of the drive motor structure into triangular elements. Discretization principle: After the outer surface of the drive motor structure is discretized, the area of each triangular element < 5mm^2. Record the actual areas of all triangular elements. Record them as S1, S2,..., Sk. K represents the total number of actually discretized triangular elements. The surface of the discretized drive motor assembly is as shown in the appendix Figure 13 as shown.

[0335] Step 3.2) Calculate the total vibration energy of the outer surface of the drive motor at each excitation frequency under the action of the radial zero-order spatial-order electromagnetic excitation, and the noise caused by the total vibration energy of the outer surface of the drive motor under the action of the radial zero-order spatial-order electromagnetic excitation.

[0336] Step 3.2.1) Set the excitation frequency of the applied radial zero-order spatial-order electromagnetic excitation load to THz to perform vibration excitation on the entire drive motor, and record the average vibration velocities of all discretized triangular elements, which are respectively recorded as v rT1 、v rT2 、...、v rTK , where K is the total number of discretized triangular elements, T is the excitation frequency, and T = 1Hz, 2Hz, 3Hz,..., 8000Hz;

[0337] Step 3.2.2) Calculate the total vibration energy of the outer surface of the drive motor at each excitation frequency under the action of the radial zero-order spatial-order electromagnetic excitation:

[0338]

[0339] Where: L rw-0-THz It represents the total vibration energy of the entire outer surface of the driving motor calculated based on the radial zero-order spatial order electromagnetic excitation under the condition of the excitation frequency of THz; Si is the area of the discretized triangular unit;

[0340] According to the above formula, the total vibration energy of the outer surface of the entire drive motor caused by the radial zero-order spatial order electromagnetic excitation under the frequency of 1Hz, 2Hz, 3Hz, ..., 8000Hz is calculated respectively and recorded as: L rw-0-1Hz , L rw-0-2Hz , L rw-0-3Hz ,...L rw-0-8000H .

[0341] Step 3.2.3) calculates the noise caused by the vibration in step 3.2.2) based on the magnitude of the excitation frequency.

[0342] When the excitation frequency T≤2000Hz, the noise is calculated based on the following formula:

[0343] P rw-0-THz =L rw-0-1Hz -8+log(T / 2000)

[0344] Where: P rw-0-THz It represents the noise caused by the total energy of the outer surface vibration of the driving motor under the action of radial zero-order spatial order electromagnetic excitation when the excitation frequency is THz;

[0345] When the excitation frequency T>2000Hz, the noise is calculated based on the following formula:

[0346] P rw-0-THz =L rw-0-THz -8;

[0347] The calculated noise curve is shown in the attached Figure 14 shown.

[0348] Step 3.3) Calculate the total vibration energy of the outer surface of the driving motor at each excitation frequency under the action of the tangential zero-order spatial order electromagnetic excitation, and the noise caused by the total vibration energy of the outer surface of the driving motor under the action of the tangential zero-order spatial order electromagnetic excitation.

[0349] Step 3.3.1) Set the excitation frequency of the applied tangential zero-order spatial order electromagnetic excitation load to THz to vibrate the entire drive motor, and record the average vibration velocity of all discretized triangular elements, which are recorded as V tT1 、V tT2 ,...,v tTK ;

[0350] Step 3.3.2) Calculate the total vibration energy of the outer surface of the drive motor at each excitation frequency under the action of the tangential zero-order spatial-order electromagnetic excitation:

[0351]

[0352] In the formula: L tw-0-THz represents the total vibration energy of the entire outer surface of the drive motor calculated according to the tangential zero-order spatial-order electromagnetic excitation under the condition that the excitation frequency is THz;

[0353] According to the above formula, calculate the total vibration energy of the outer surface of the entire drive motor caused by the tangential zero-order spatial-order electromagnetic excitation under the conditions of frequencies of 1 Hz, 2 Hz, 3 Hz,..., 8000 Hz, and record them as: L tw-0-1Hz 、Lt w-0-2Hz 、L tw-0-3Hz 、...L tw-0-8000Hz .

[0354] Step 3.3.3) Calculate the noise caused by the vibration in Step 3.3.2 according to the magnitude of the excitation frequency.

[0355] When the excitation frequency T ≤ 2000 Hz, calculate the noise based on the following formula:

[0356] P tw-0-THz =L tw-0-1Hz -8 + log(T / 2000)

[0357] In the formula: P tw-0-THz represents the noise caused by the total vibration energy of the outer surface of the drive motor under the action of the tangential zero-order spatial-order electromagnetic excitation when the excitation frequency is THz;

[0358] When the excitation frequency T > 2000 Hz, calculate the noise based on the following formula:

[0359] P tw-0-THz =L tw-0- T Hz -8;

[0360] The calculated noise curve is as shown in the appendix Figure 15 .

[0361] Step 3.4) Calculate the structural sensitivity coefficient of the zero-order spatial-order electromagnetic excitation of the drive motor according to the following formula:

[0362] DD0 = 1.2 * average(P rw-0-THz ) + Max(P rw-0-THz ) + 0.8 * (1.2 * average(P tw-0-THz) + Max(P tw-0-THz ))

[0363] Where: DD0 represents the sensitivity coefficient of the electromagnetic excitation structure of the zero-order spatial order of the drive motor. In this specific embodiment, DD0 = 252.1.

[0364] Step 3.4) Calculate the sensitivity coefficient of the electromagnetic excitation structure of the zero-order spatial order of the drive motor.

[0365] Step 4) Calculate the sensitivity coefficient of the electromagnetic excitation structure of the non-zero-order spatial order of the drive motor.

[0366] Step 4.1) Discretize the outer surface of the drive motor structure into triangular elements. Discretization principle: After the outer surface of the drive motor structure is discretized, the area of each triangular element < 5 mm^2. Record the actual areas of all triangular elements. Recorded as S1, S2...., Sk. K represents the total number of actually discretized triangular elements.

[0367] Step 4.2) Calculate the sensitivity coefficient DD6 of the electromagnetic excitation structure of the 6th-order spatial order of the drive motor.

[0368] Step 4.2.1) Set the excitation frequency of the applied radial 6th-order spatial order electromagnetic excitation load to THz to perform vibration excitation on the entire drive motor, and record the average vibration velocity of all discretized triangular elements, respectively recorded as V 6rT1 、V 6rT2 、...、v 6rTK , where K is the total number of discretized triangular elements, T is the excitation frequency, and T = 1 Hz, 2 Hz, 3 Hz,..., 8000 Hz;

[0369] Step 4.2.2) Calculate the total vibration energy of the outer surface of the drive motor vibration at each excitation frequency under the action of the radial 6th-order spatial order electromagnetic excitation load:

[0370]

[0371] Where: L rw-6-THz represents the total vibration energy of the outer surface of the entire drive motor vibration calculated according to the radial 6th-order spatial order electromagnetic excitation under the condition that the excitation frequency is THz; Si is the area of the discretized triangular element;

[0372] According to the above formula, calculate the total vibration energy of the outer surface of the entire drive motor vibration caused by the radial 6th-order spatial order electromagnetic excitation under the conditions of frequencies of 1 Hz, 2 Hz, 3 Hz,..., 8000 Hz, respectively recorded as: L rw-6-1Hz 、L rw-6-2Hz 、L rw-6-3Hz 、...L rw-6-8000Hz .

[0373] Step 4.2.3) Calculate the noise caused by vibration in Step 4.2.2):

[0374] When the excitation frequency T ≤ 2000 Hz, calculate the noise based on the following formula:

[0375] P rw-6-THz = L rw-6-1Hz - 8 + log(T / 2000)

[0376] In the formula: P rw-6-THz represents the noise caused by the total vibration energy on the outer surface of the drive motor under the action of the radial 6th-order spatial-order electromagnetic excitation when the excitation frequency is THz;

[0377] When the excitation frequency T > 2000 Hz, calculate the noise based on the following formula:

[0378] P rw-6-THz = L rw-6-THz - 8;

[0379] Step 4.2.4) Set the excitation frequency of the applied tangential 6th-order spatial-order electromagnetic excitation load to THz, perform vibration excitation on the entire drive motor, record the average vibration velocity of all discretized triangular elements, and record them as V 6tT1 、V 6tT2 、...、v 6tTK ;

[0380] Step 4.2.5) Calculate the total vibration energy on the outer surface of the drive motor vibration under the action of the tangential 6th-order spatial-order electromagnetic excitation load at each excitation frequency:

[0381]

[0382] In the formula: L tw-6-THz represents the total vibration energy of the outer surface of the entire drive motor vibration calculated according to the tangential 6th-order spatial-order electromagnetic excitation under the condition that the excitation frequency is THz;

[0383] According to the above formula, calculate the total vibration energy of the outer surface of the entire drive motor vibration caused by the tangential 6th-order spatial-order electromagnetic excitation under the conditions of frequencies of 1 Hz, 2 Hz, 3 Hz,..., 8000 Hz respectively, and record them as: L tw-6-1Hz 、L tw-6-2Hz 、L tw-6-3Hz 、...L tw-6-8000Hz .

[0384] Step 4.2.6) Calculate the noise caused by vibration in Step 4.2.5):

[0385] When the excitation frequency T ≤ 2000 Hz, the noise is calculated based on the following formula:

[0386] P tw-6-THz = L tw-6-1Hz -8 + log(T / 2000)

[0387] In the formula: P tw-6-THz represents the noise caused by the total vibration energy on the outer surface of the drive motor under the action of the tangential 6th-order spatial-order electromagnetic excitation when the excitation frequency is THz;

[0388] When the excitation frequency T > 2000 Hz, the noise is calculated based on the following formula:

[0389] P tw-6-THz = L tw-6-THz -8;

[0390] In step 4.2.7), the sensitivity coefficient of the 6th-order spatial-order electromagnetic excitation structure of the drive motor is calculated according to the following formula:

[0391] DD6 = 1.2 * average(P rw-6- T Hz ) + Max( Prw-6-THz ) + 0.8 * (1.2 * average(P tw-6-THz ) + Max(P tw-6-THz ))

[0392] In the formula: DD6 represents the sensitivity coefficient of the 6th-order spatial-order electromagnetic excitation structure of the drive motor. In this specific embodiment, DD6 = 227.1.

[0393] Step 4.3) Calculate the sensitivity coefficient DD8 of the 8th-order spatial-order electromagnetic excitation structure of the drive motor.

[0394] Step 4.3.1) Set the excitation frequency of the applied radial 8th-order spatial-order electromagnetic excitation load to THz to perform vibration excitation on the entire drive motor, and record the average vibration velocity of all discretized triangular elements, which are respectively recorded as V 8rT1 、V 8rT2 、...、v 8rTK , where K is the total number of discretized triangular elements, T is the excitation frequency, and T = 1 Hz, 2 Hz, 3 Hz,..., 8000 Hz;

[0395] Step 4.3.2) Calculate the total vibration energy on the vibrating outer surface of the drive motor at each excitation frequency under the action of the radial 8th-order spatial-order electromagnetic excitation load:<>

[0396]

[0397] In the formula: Lrw-8-THz It represents the total vibration energy of the outer surface of the entire driving motor calculated according to the radial 8th-order spatial-order electromagnetic excitation under the condition that the excitation frequency is THz; Si is the area of the discretized triangular element;

[0398] According to the above formula, the total vibration energy of the outer surface of the entire driving motor caused by the radial 8th-order spatial-order electromagnetic excitation under the conditions of frequencies of 1 Hz, 2 Hz, 3 Hz,..., 8000 Hz is calculated respectively and recorded as: L rw-8-1Hz 、L rw-8-2Hz 、L rw-8-3Hz 、...L rw-8-8000Hz 。

[0399] Step 4.3.3) Calculate the noise caused by the vibration in Step 4.3.2):

[0400] When the excitation frequency T ≤ 2000 Hz, calculate the noise based on the following formula:

[0401] P rw-8-rHz =L rw-8-1Hz -8 + log(T / 2000)

[0402] In the formula: P rw-8-THz represents the noise caused by the total vibration energy of the outer surface of the driving motor under the action of the radial 8th-order spatial-order electromagnetic excitation when the excitation frequency is THz;

[0403] When the excitation frequency T > 2000 Hz, calculate the noise based on the following formula:

[0404] P rw-8-THz =L rw-8-THz -8;

[0405] Step 4.3.4) Set the excitation frequency of the applied tangential 8th-order spatial-order electromagnetic excitation load to THz and perform vibration excitation on the entire driving motor, and record the average vibration velocities of all discretized triangular elements, which are recorded as V 8tT1 、V 8tT2 、...、v 8tTK ;

[0406] Step 4.3.5) Calculate the total vibration energy of the outer surface of the driving motor at each excitation frequency under the action of the tangential 8th-order spatial-order electromagnetic excitation load:

[0407]

[0408] In the formula: L tw-8-THz represents the total vibration energy of the outer surface of the entire driving motor calculated according to the tangential 8th-order spatial-order electromagnetic excitation under the condition that the excitation frequency is THz;

[0409] According to the above formula, calculate the total vibration energy of the outer surface of the entire drive motor caused by the tangential 8th-order spatial-order electromagnetic excitation under the conditions of frequencies of 1 Hz, 2 Hz, 3 Hz,..., 8000 Hz, and record them respectively as: L tw-8-1Hz 、L tw-8-2Hz 、L tw-8-3Hz 、...L tw-8-8000H 。

[0410] Step 4.3.6) Calculate the noise caused by the vibration in Step 4.3.5):

[0411] When the excitation frequency T ≤ 2000 Hz, calculate the noise based on the following formula:

[0412] P tw-8-THz =L tw-8-1Hz -8 + log(T / 2000)

[0413] In the formula: P tw-8-THz represents the noise caused by the total vibration energy of the outer surface of the drive motor under the action of the tangential 8th-order spatial-order electromagnetic excitation when the excitation frequency is THz;

[0414] When the excitation frequency T > 2000 Hz, calculate the noise based on the following formula:

[0415] P tw-8-THz =L tw-8-THz -8;

[0416] In Step 4.3.7), calculate the structural sensitivity coefficient of the 8th-order spatial-order electromagnetic excitation of the drive motor according to the following formula:

[0417] DD8 = 1.2 * average(P rw-8-THz ) + Max(P rw-8-THz ) + 0.8 * (1.2 * average(P tw-8-THz )) + Max(P tw-8-THz )) In the formula: DD8 represents the structural sensitivity coefficient of the 8th-order spatial-order electromagnetic excitation of the drive motor. In this specific embodiment, DD8 = 203.4.

[0418] Step 4.4) Calculate the structural sensitivity coefficient DD 12 。

[0419] Step 4.4.1) Set the excitation frequency of the applied radial 12th-order spatial-order electromagnetic excitation load to THz to perform vibration excitation on the entire drive motor, and record the average vibration velocity of all discretized triangular elements, and record them respectively as V 12rT1 、V12rT2 ,..., v 12rTK , where K is the total number of discretized triangular elements, T is the excitation frequency, and T = 1 Hz, 2 Hz, 3 Hz,..., 8000 Hz;

[0420] Step 4.4.2) Calculate the total vibration energy of the outer surface of the drive motor at each excitation frequency under the action of the 12th-order radial spatial-order electromagnetic excitation load:

[0421]

[0422] In the formula: L rw-12-THz represents the total vibration energy of the entire outer surface of the drive motor calculated according to the 12th-order radial spatial-order electromagnetic excitation under the condition that the excitation frequency is THz; Si is the area of the discretized triangular element;

[0423] According to the above formula, calculate the total vibration energy of the entire outer surface of the drive motor caused by the 12th-order radial spatial-order electromagnetic excitation at frequencies of 1 Hz, 2 Hz, 3 Hz,..., 8000 Hz respectively, and record them as: L rw-12-1Hz , L rw-12-2Hz , L rw-12-3Hz ,... L rw-12-8000Hz .

[0424] Step 4.4.3) Calculate the noise caused by the vibration in Step 4.4.2):

[0425] When the excitation frequency T ≤ 2000 Hz, calculate the noise based on the following formula:

[0426] P rw-12-THz = L rw-12-1Hz -8 + log(T / 2000)

[0427] In the formula: P rw-12-THz represents the noise caused by the total vibration energy of the outer surface of the drive motor under the action of the 12th-order radial spatial-order electromagnetic excitation when the excitation frequency is THz;

[0428] When the excitation frequency T > 2000 Hz, calculate the noise based on the following formula:

[0429] P rw-12-THz = L rw-12-THz -8;

[0430] Step 4.4.4) Set the excitation frequency of the applied tangential 12th-order spatial-order electromagnetic excitation load to THz to perform vibration excitation on the entire drive motor, and record the average vibration velocity of all discretized triangular elements, and record them as V 12tT1 , V 12tT2 ,..., v12tTK ;

[0431] Step 4.4.5) Calculate the total vibration energy of the outer surface of the drive motor at each excitation frequency under the action of the tangential 12th-order spatial-order electromagnetic excitation load:

[0432]

[0433] where: L tw-12-THz represents the total vibration energy of the entire outer surface of the drive motor calculated according to the tangential 12th-order spatial-order electromagnetic excitation under the condition that the excitation frequency is THz;

[0434] According to the above formula, calculate the total vibration energy of the outer surface of the entire drive motor caused by the tangential 12th-order spatial-order electromagnetic excitation under the conditions of frequencies of 1 Hz, 2 Hz, 3 Hz,..., 8000 Hz, and record them as: L tw-12-1Hz 、L tw-12-2Hz 、L tw-12-3H z、...L tw-12-8000Hz .

[0435] Step 4.4.6) Calculate the noise caused by the vibration in Step 4.4.5):

[0436] When the excitation frequency T ≤ 2000 Hz, calculate the noise based on the following formula:

[0437] P tw-12-THz =L tw-12-1Hz -8 + log(T / 2000)

[0438] where: P tw-12-THz represents the noise caused by the total vibration energy of the outer surface of the drive motor under the action of the tangential 12th-order spatial-order electromagnetic excitation when the excitation frequency is THz;

[0439] When the excitation frequency T > 2000 Hz, calculate the noise based on the following formula:

[0440] P tw-12-THz =L tw-12-THz -8;

[0441] In Step 4.4.7), calculate the structural sensitivity coefficient of the 12th-order spatial-order electromagnetic excitation of the drive motor according to the following formula:

[0442] DD 12 =1.2 * average(P rw-12-THz ) + Max(P rw-12-THz ) + 0.8 * (1.2 * average(P tw-12-THz ) + Max(P tw-12-THz ))

[0443] Where: DD 12 represents the sensitivity coefficient of the electromagnetic excitation structure of the 12th spatial order of the drive motor. In this specific embodiment, DD 12 = 113.9.

[0444] Step 4.5) Calculate the sensitivity coefficient DD of the electromagnetic excitation structure of the 24th spatial order of the drive motor 24 .

[0445] Step 4.5.1) Set the excitation frequency of the applied radial 24th spatial order electromagnetic excitation load to THz to perform vibration excitation on the entire drive motor, record the average vibration velocity of all discretized triangular elements, and record them as V 24rT1 , V 24rT2 ,..., v 24rTK , where K is the total number of discretized triangular elements, T is the excitation frequency, and T = 1Hz, 2Hz, 3Hz,..., 8000Hz;

[0446] Step 4.5.2) Calculate the total vibration energy of the outer surface of the drive motor vibration at each excitation frequency under the action of the radial 24th spatial order electromagnetic excitation load:

[0447]

[0448] Where: L rw-2 4 -THz represents the total vibration energy of the outer surface of the entire drive motor vibration calculated according to the radial 24th spatial order electromagnetic excitation under the condition that the excitation frequency is THz; Si is the area of the discretized triangular element;

[0449] According to the above formula, calculate the total vibration energy of the outer surface of the entire drive motor vibration caused by the radial 24th spatial order electromagnetic excitation under the conditions of frequencies of 1Hz, 2Hz, 3Hz,..., 8000Hz respectively, and record them as: L rw-24-1Hz , L rw-24-2Hz , L Tw-24-3Hz ,...L Tw-24-8000Hz .

[0450] Step 4.5.3) Calculate the noise caused by the vibration in Step 4.5.2):

[0451] When the excitation frequency T ≤ 2000Hz, calculate the noise based on the following formula:

[0452] P rw-24-THz = L rw-24-1Hz -8 + log(T / 2000)

[0453] Where: Prw-24-THz It represents the noise caused by the total vibration energy on the outer surface of the drive motor under the action of the 24th-order radial spatial-order electromagnetic excitation when the excitation frequency is THz.

[0454] When the excitation frequency T > 2000 Hz, the noise is calculated based on the following formula:

[0455] P rw-24-THz = L rw-24-THz -8;

[0456] Step 4.5.4) Set the excitation frequency of the applied tangential 24th-order spatial-order electromagnetic excitation load to THz, and perform vibration excitation on the entire drive motor. Record the average vibration velocity of all discretized triangular elements, which are respectively recorded as V 24tT1 、V 24tT2 、...、v 24tTK ;

[0457] Step 4.5.5) Calculate the total vibration energy of the outer surface of the drive motor under the action of the tangential 24th-order spatial-order electromagnetic excitation load at each excitation frequency:

[0458]

[0459] In the formula: L tw-24-THz represents the total vibration energy of the outer surface of the entire drive motor calculated according to the tangential 24th-order spatial-order electromagnetic excitation under the condition that the excitation frequency is THz;

[0460] According to the above formula, calculate the total vibration energy of the outer surface of the entire drive motor caused by the tangential 24th-order spatial-order electromagnetic excitation at frequencies of 1 Hz, 2 Hz, 3 Hz,..., 8000 Hz respectively, and record them as: L tw-24-1Hz 、L tw-24-2Hz 、L tw-24-3Hz 、...L tw-24-8000Hz .

[0461] Step 4.5.6) Calculate the noise caused by the vibration in Step 4.5.5):

[0462] When the excitation frequency T ≤ 2000 Hz, the noise is calculated based on the following formula:

[0463] P tw-24-THz = L tw-24-1Hz -8 + log(T / 2000)

[0464] In the formula: P tw-24-THz represents the noise caused by the total vibration energy on the outer surface of the drive motor under the action of the tangential 24th-order spatial-order electromagnetic excitation when the excitation frequency is THz;

[0465] When the excitation frequency T > 2000 Hz, the noise is calculated based on the following formula:

[0466] P tw-24-THz = L tw-24-THz - 8;

[0467] In step 4.5.7), the sensitivity coefficient of the 24th - order spatial - order electromagnetic excitation structure of the drive motor is calculated according to the following formula:

[0468] DD 24 = 1.2*average(P rw-24-TH ) + Max(P rw-24-THz ) + 0.8*(1.2*average(P tw-24-THz ) + Max(P tw-24-THz )) In the formula: DD 24 represents the sensitivity coefficient of the 24th - order spatial - order electromagnetic excitation structure of the drive motor. In this specific embodiment, DD 24 = 18.4.

[0469] The calculation results of the radial - force noise of the 6th, 8th, 12th, and 24th spatial orders are as shown in the appendix Figure 16 shown, and the calculation results of the tangential - force noise of the 6th, 8th, 12th, and 24th spatial orders are as shown in the appendix Figure 17 shown.

[0470] Step 4.6) Calculate the sensitivity coefficient of the non - zero - order spatial - order electromagnetic excitation structure of the drive motor based on the following formula:

[0471] DD x = 0.2*DD6 + 0.6*DD8 + DD 12 + 2*DD 24

[0472] In the formula: DD x is the calculated sensitivity coefficient of the non - zero - order spatial - order electromagnetic excitation structure of the drive motor. In this specific embodiment

[0473] DD x = 188.8.

[0474] Step 5) Calculate the response consistency coefficient of the multi - spatial - order electromagnetic excitation structure of the drive motor.

[0475] Calculate the response consistency coefficient of the multi - spatial - order electromagnetic excitation structure of the drive motor according to the following formula:

[0476] Tre = (DD0 - DD6) / (20*Log(5))+(DD0 - DD8) / (20*Log(7))+(DD0 - DD 12 ) / (20*Log(11))+(DD0 - DD 24) / (20*Log(23))

[0477] Where: Tre represents the consistency coefficient of the response of the multi - spatial - order electromagnetic excitation structure of the drive motor. In this specific embodiment, Tre = 0.97.

[0478] Step 6) Analyze and evaluate the sensitivity of the drive motor structure - electromagnetic load excitation.

[0479] Calculate the sensitivity coefficient of the drive motor structure - electromagnetic load excitation based on the following formula:

[0480] LMD = Tre + 1 / DD0 + 1 / DD x

[0481] Where: LMD represents the sensitivity coefficient of the drive motor structure - electromagnetic load excitation. In this specific embodiment, LMD = 1.9.

[0482] Analyze and evaluate the sensitivity of the drive motor structure - electromagnetic load excitation according to the sensitivity coefficient of the drive motor structure - electromagnetic load excitation. For specific evaluation, refer to Table 1, the scoring and rating table of the drive motor structure - electromagnetic load excitation sensitivity.

[0483] Table 1: Scoring and rating table of the drive motor structure - electromagnetic load excitation sensitivity

[0484]

[0485] In this specific embodiment, LMD = 1.9, so the score is 6 points and the grade is qualified.

[0486] Step 7) Set the design target for the zero - order spatial - order electromagnetic force of the drive motor.

[0487] Step 7.1) In the range of T1~T2Hz, calculate the average value of the noise caused by the radial zero - order spatial - order electromagnetic force of the drive motor, the average value of the noise caused by the tangential zero - order spatial - order electromagnetic force of the drive motor, and the average value of the bench noise target respectively. T1 = 1Hz, 501Hz, 1001Hz, 1501Hz... 7501Hz, and T2 - T1 = 499Hz.

[0488] The formula for calculating the average value of the noise caused by the radial zero - order spatial - order electromagnetic force of the drive motor is:

[0489]

[0490] The formula for calculating the average value of the noise caused by the tangential zero - order spatial - order electromagnetic force of the drive motor is:

[0491]

[0492] The calculation formula for the average value of the test bench noise target is:

[0493]

[0494] Where: P rwave(T1～T2) is the average value of the noise caused by the zero-order spatial electromagnetic force of the driving motor in the frequency range of T1 to T2 Hz, P twave(T1～T2) is the average value of the noise caused by the tangential zero-order spatial order electromagnetic force of the driving motor within the frequency range of T1 to T2 Hz, P tarave(T1～T2) is the average value of the test bench noise target within the frequency range of T1 to T2 Hz, P tari Indicates the noise target value under the condition of frequency iHz;

[0495] According to the above formula, the average value P of the noise caused by the zero-order spatial electromagnetic force of the drive motor in the frequency range of 1~500Hz, 501~1000Hz, 1001~1500Hz...7501~8000Hz is calculated respectively. rwave(1～500) , P rwave(501～1000) , P rwave(1001～1500) ,...P rwave(7501～8000) , the average value of the noise caused by the zero-order spatial electromagnetic force of the driving motor P twave(1～500) , P twave(501～1000) , P twave(1001～1500) ,...P twave(7501～8000) , and the average value of the test bench noise target P tarave(1～500) , P tarave(501～1000) , P tarave(1001～1500) ,...P tarave(7501～8000) .

[0496] The noise target curve in this specific embodiment is shown in the attached Figure 18 The average values of the noise caused by the zero-order electromagnetic force in the radial space in each frequency range are shown in Table 2; the average values of the noise caused by the zero-order electromagnetic force in the tangential space in each frequency range are shown in Table 4.

[0497] Table 2: Average value of noise caused by zero-order electromagnetic force in radial space in each frequency range

[0498] Frequency range Hz 1～500 501～1000 1001～1500 1501～2000 2001～2500 2501～3000 3001～3500 3501～4000 Noise average dB 1.3 29.3 38.4 46.3 51.2 51.3 57.3 68.9 Frequency range Hz 4001～4500 4501～5000 5001～5500 5501～6000 6001～6500 6501～7000 7001～7500 7501～8000 Noise average dB 66.9 58.5 55.8 55.5 55.0 52.1 49.6 46.5

[0499] Table 3: Average value of noise caused by zero-order electromagnetic force in tangential space in each frequency range

[0500] Frequency range Hz 1～500 501～1000 1001～1500 1501～2000 2001～2500 2501～3000 3001～3500 3501～4000 Noise average dB 23.5 51.2 65.4 67.4 62.9 65.5 69.3 67.8 Frequency range Hz 4001～4500 4501～5000 5001～5500 5501～6000 6001～6500 6501～7000 7001～7500 7501～8000 Noise average dB 63.0 60.3 58.1 60.0 60.6 58.8 57.6 61.5

[0501] Step 7.2) Determine the zero-order spatial order electromagnetic force target of the drive motor within the T1 to T2 Hz frequency range based on the average noise caused by the radial zero-order spatial order electromagnetic force of the drive motor calculated in Step 7.1), the average noise caused by the tangential zero-order spatial order electromagnetic force of the drive motor, and the average value of the bench noise target.

[0502] When P rwave(T1～T2) -P twave(T1～T2) > 0 dB,

[0503] The radial zero-order spatial order electromagnetic force target P rwtar(T1～T2) = 10^((P tarave(T1～T2) -P rwmax(T1～T2) ) /

[0504] 20) * 1000;

[0505] The tangential zero-order spatial order electromagnetic force target P twta(T1～T2) = 1500 Pa;

[0506] Where: P rwmax(T1～T2) represents the maximum value of the noise caused by the radial zero-order spatial order electromagnetic force within the T1 to T2 Hz frequency range;

[0507] In this specific embodiment, the maximum values of the noise caused by the radial spatial zero-order electromagnetic force in each frequency range are shown in Table 4.

[0508] Table 4: Maximum values of the noise caused by the radial spatial zero-order electromagnetic force in each frequency range

[0509] Frequency range Hz 1～500 501～1000 1001～1500 1501～2000 2001～2500 2501～3000 3001～3500 3501～4000 Noise average dB 30.9 37.7 46.0 49.1 56.5 54.5 62.3 73.3 Frequency range Hz 4001～4500 4501～5000 5001～5500 5501～6000 6001～6500 6501～7000 7001～7500 7501～8000 Noise average dB 69.6 61.4 57.3 56.0 55.3 54.3 50.6 47.8

[0510] When P rwave(T1～T2) -P twave(T1～T2) < -6 dB,

[0511] The radial zero-order spatial order electromagnetic force target P rwtar(T1～T2) = 5000 Pa;

[0512] The tangential zero-order spatial order electromagnetic force target P twt(T1～T2) = 10^((P tarave(T1～T2) -P twmax(T1～T2) ) /

[0513] 20) * 300;

[0514] Where: P twmax(T1～T2) represents the maximum value of the noise caused by the tangential zero-order spatial order electromagnetic force within the T1 to T2 Hz frequency range;

[0515] In this specific embodiment, the maximum values of the noise caused by the tangential spatial zero-order electromagnetic force in each frequency range are shown in Table 5.

[0516] Table 5: Maximum noise caused by tangential space zero-order electromagnetic force in each frequency range

[0517] Frequency range Hz 1～500 501～1000 1001～1500 1501～2000 2001～2500 2501～3000 3001～3500 3501～4000 Noise average dB 57.4 60.8 78.6 74.2 66.2 68.7 71.9 69.5 Frequency range Hz 4001～4500 4501～5000 5001～5500 5501～6000 6001～6500 6501～7000 7001～7500 7501～8000 Noise average dB 66.7 61.3 59.6 60.8 61.0 60.6 58.8 64.0

[0518] When -6dB < P rwave(T1～T2) -P twave(T1～T2) <0dB,

[0519] Radial zero-order space-order electromagnetic force target P rwtar(T1～T2) = 10^(((P tarave(T1～T2) - 3) - P rwmax(T1～T2) ) /

[0520] 20) * 1000;

[0521] Tangential zero-order space-order electromagnetic force target P twtar(T1～T2) = 10^(((P tarave(T1～T2) - 3) - P twmax(T1～T2) ) / 20) * 300.

[0522] According to the above steps, calculate the radial space zero-order electromagnetic force target P in the frequency ranges of 1 - 500Hz, 501 - 1000Hz, 1001Hz - 1500Hz,...., 7501Hz - 8000Hz at intervals of 500Hz rwtar(1～500) , P rwtar(501～1000) , P rwtar(1001～1500) ,....P rwtar(7501～8000) , and the tangential space zero-order electromagnetic force target P twtar(1～500) , P twtar(501～1000) , P twtar(1001～1500) ,....P twtar(7501～8000) .

[0523] The calculated radial space zero-order electromagnetic force target and tangential space zero-order electromagnetic force target values in this specific embodiment are shown in Table 6 and Table 7 respectively.

[0524] Table 6: Calculated radial space zero-order electromagnetic force target value (unit: Pa)

[0525] Frequency range Hz 1～500 501～1000 1001～1500 1501～2000 2001～2500 2501～3000 3001～3500 3501～4000 Electromagnetic force target 5000 5000 5000 5000 5000 5000 5000 684 Frequency range Hz 4001～4500 4501～5000 5001～5500 5501～6000 6001～6500 6501～7000 7001～7500 7501～8000 Electromagnetic force target 1905 3055 3548 3845 5000 5000 5000 5000

[0526] Table 7: Calculated tangential space zero-order electromagnetic force target value (unit: Pa)

[0527] Frequency range Hz 1～500 501～1000 1001～1500 1501～2000 2001～2500 2501～3000 3001～3500 3501～4000 Electromagnetic force target 1127 147 91 227 679 503 325 1500 Frequency range Hz 4001～4500 4501～5000 5001～5500 5501～6000 6001～6500 6501～7000 7001～7500 7501～8000 Electromagnetic force target 1500 648 835 671 626 1089 1250 798

[0528] Step 8) Formulate the design target for the non-zero-order space-order electromagnetic force of the drive motor.

[0529] Step 8.1) Formulate the radial 6th-order space-order electromagnetic force target P of the drive motor rw6tar(T1～T2)And the tangential 6th - order spatial - order electromagnetic force target P tw6tar(T1～T2) 。

[0530] Step 8.1.1) In the range of T1 - T2 Hz, calculate the average value of the noise caused by the radial 6th - order spatial - order electromagnetic force of the drive motor and the average value of the noise caused by the tangential 6th - order spatial - order electromagnetic force of the drive motor respectively;

[0531] The formula for calculating the average value of the noise caused by the radial 6th - order spatial - order electromagnetic force of the drive motor is:

[0532]

[0533] The formula for calculating the average value of the noise caused by the tangential 6th - order spatial - order electromagnetic force of the drive motor is:

[0534]

[0535] In the formula: P rw6a(T1～T2) is the average value of the noise caused by the radial 6th - order spatial - order electromagnetic force of the drive motor in the frequency range of T 1～ T2 Hz, and P tw6ave(T1～T2) is the average value of the noise caused by the tangential 6th - order spatial - order electromagnetic force of the drive motor in the frequency range of T1 - T2 Hz.

[0536] According to the above formulas, calculate the average value of the noise caused by the radial 6th - order spatial - order electromagnetic force of the drive motor P rw6ave(1～500) , P rw6ave(501～1000) , P rw6atve(1001～1500) ,... P rw6a(7501～8000) and the average value of the noise caused by the tangential 6th - order spatial - order electromagnetic force of the drive motor P tw6ave(1～500) , P tw6ave(501～1000) , P tw6ave(1001～1500) ,... P tw6ave(7501～8000) 。

[0537] Step 8.1.2) According to the average value of the noise caused by the radial 6th - order spatial - order electromagnetic force of the drive motor, the average value of the noise caused by the tangential 6th - order spatial - order electromagnetic force of the drive motor, and the average value of the bench - noise target calculated in Step 8.1.1), formulate the 6th - order spatial - order electromagnetic force target of the drive motor in the frequency range of T1 - T2 Hz.

[0538] When P rw6a(T1～T2) - P tw6av(T1～T2) > 2 dB,

[0539] The radial 6th - order spatial - order electromagnetic force target P rw6tar(T1～T2) = 10^((P tarave(T1～T2) - Prw6(T1～T2) ) /

[0540] 40)*20000;

[0541] Tangential 6th-order spatial-order electromagnetic force target P tw6tar(T1～T2) = 1500*6^2 Pa;

[0542] Where: P rw6max(T1～T2) represents the maximum value of the noise caused by the radial 6th-order spatial-order electromagnetic force in the frequency range of T1 to T2 Hz;

[0543] When P rw6ave(T1～T2) - P tw6ave(T1～T2) < -4 dB,

[0544] Radial 6th-order spatial-order electromagnetic force target P rw6tar(T1～T2) = 5000*6^2 Pa;

[0545] Tangential 6th-order spatial-order electromagnetic force target P tw6ta(T1～T2) = 10^((P tarave(T1～T2) - P tw6max(T1～T2) ) / 40)*8000;

[0546] When -4 dB < P rw6ave(T11～T2) - P tw6ave(T1～T2) < 2 dB,

[0547] Radial 6th-order spatial-order electromagnetic force target

[0548] P rw6tar(T1～T2) = 10^(((P tarave(T1～T2) - 3)- P rw6ave(T1～T2) ) / 40)*20000;

[0549] Tangential 6th-order spatial-order electromagnetic force target P tw6tar(T1～T2) = 10^(((P tarave(T1～T2) - 3)- P tw6ave(T1～T2) ) / 40)*8000;

[0550] According to the above steps, calculate the radial spatial 6th-order electromagnetic force targets P rw6tar(1～500) , P rw6tar(501～1000) , P rw6tar(1001～1500) ,....P rw6tar(7501～8000) , and the tangential spatial 6th-order electromagnetic force targets P tw6tar(1～500) , P tw6tar(501～1000) , P tw6tar(1001～1500) ,....P tw6tar(7501～8000) .

[0551] Step 8.2) Set the target \(P\) for the radial 8th - order spatial - order electromagnetic force of the drive motor rw8tar(T1～T2) and the target \(P\) for the tangential 8th - order spatial - order electromagnetic force of the drive motor tw8tar(T1～T2) ;

[0552] Step 8.2.1) In the range of \(T1\sim T2\) Hz, calculate the average value of the noise caused by the radial 8th - order spatial - order electromagnetic force of the drive motor and the average value of the noise caused by the tangential 8th - order spatial - order electromagnetic force of the drive motor respectively;

[0553] The formula for calculating the average value of the noise caused by the radial 8th - order spatial - order electromagnetic force of the drive motor is:

[0554]

[0555] The formula for calculating the average value of the noise caused by the tangential 8th - order spatial - order electromagnetic force of the drive motor is:

[0556]

[0557] Where: \(P\) rw8a(T1～T2) is the average value of the noise caused by the radial 8th - order spatial - order electromagnetic force of the drive motor in the frequency range of \(T1\sim T2\) Hz, and \(P\) tw8a(T1～T2) is the average value of the noise caused by the tangential 8th - order spatial - order electromagnetic force of the drive motor in the frequency range of \(T1\sim T2\) Hz.

[0558] According to the above formula, calculate the average value \(P\) rw8av(1～500) , \(P\) rw8a(501～1000) , \(P\) rw(1001～1500) ,... \(P\) rw8a(7501～8000) of the noise caused by the radial 8th - order spatial - order electromagnetic force of the drive motor under the conditions of the frequency ranges of \(1\sim500\) Hz, \(501\sim1000\) Hz, \(1001\sim1500\) Hz... \(7501\sim8000\) Hz, tw8ave(1～500) , \(P\) tw8ave(501～1000) , \(P\) tw8ave(1001～1500) ,... \(P\) tw8ave(7501～8000) .

[0559] Step 8.2.2) Set the target for the 8th - order spatial - order electromagnetic force of the drive motor in the frequency range of \(T1\sim T2\) Hz according to the average value of the noise caused by the radial 8th - order spatial - order electromagnetic force of the drive motor, the average value of the noise caused by the tangential 8th - order spatial - order electromagnetic force of the drive motor, and the average value of the bench - test noise target calculated in Step 8.2.1).

[0560] When \(P\) rw8a(T1～T2) - \(P\) tw8av(T1～T2) > 2 dB,

[0561] the target \(P\) for the radial 8th - order spatial - order electromagnetic force rw8tar(T1～T2) ​= 10^((P tarave(T1～T2) - P rw8max(T1～T2) ) / /

[0562] 40) * 20000;

[0563] Tangential 8th - order spatial - order electromagnetic force target P tw8tar(T1～T2) = 1500 * 6^2 Pa;

[0564] Where: P rw8m(T1～T2) represents the maximum value of the noise caused by the radial 8th - order spatial - order electromagnetic force in the frequency range of T1~T2 Hz;

[0565] When P rw8a(T1～T2) - P tw8ave(T1～T2) < - 4 dB,

[0566] Radial 8th - order spatial - order electromagnetic force target P rw8tar(T1～T2) = 5000 * 6^2 Pa;

[0567] Tangential 8th - order spatial - order electromagnetic force target P tw8tar(T1～T2) = 10^((P tarave(T1～T2) - P tw(T1～T2) ) / 40) * 8000;

[0568] When - 4 dB < P rw8ave(T11～T2) - P tw8ave(T1～T2) < 2 dB,

[0569] Radial 8th - order spatial - order electromagnetic force target P rw8tar(T1～T2) = 10^(((P tarave(T1～T2) - 3) - P rw8(T1～T2) ) /

[0570] 40) * 20000

[0571] Tangential 8th - order spatial - order electromagnetic force target P tw8ta(T1～T2) = 10^(((P tarave(T1～T2) - 3) - P tw8ave(T1～T2) ) / 40) * 8000.

[0572] According to the above steps, calculate the radial - space 8th - order electromagnetic force targets P rw8tar(1～500) , P rw8tar(501～1000) , P rw8tar(1001～1500) ,....P rw8tar(7501～8000) , and the tangential - space 8th - order electromagnetic force targets P tw8tar(1～500) , P tw8tar(501～1000) , P tw8tar(1001～1500) ,....P tw8tar(7501～8000) .

[0573] Step 8.3) Set the target P of the radial 12th - order space - order electromagnetic force of the drive motor rw12tar(T1～T2) and the target P of the tangential 12th - order space - order electromagnetic force of the drive motor tw12tar(T1～T2) ;

[0574] Step 8.3.1) In the range of T1 - T2 Hz, calculate the average value of the noise caused by the radial 12th - order space - order electromagnetic force of the drive motor and the average value of the noise caused by the tangential 12th - order space - order electromagnetic force of the drive motor respectively.

[0575] The formula for calculating the average value of the noise caused by the radial 12th - order space - order electromagnetic force of the drive motor is:

[0576]

[0577] The formula for calculating the average value of the noise caused by the tangential 12th - order space - order electromagnetic force of the drive motor is:

[0578]

[0579] In the formula: P rw12ave(T1～T2) is the average value of the noise caused by the radial 12th - order space - order electromagnetic force of the drive motor in the frequency range of T1 - T2 Hz, and P tw12ave(T1～T2) is the average value of the noise caused by the tangential 12th - order space - order electromagnetic force of the drive motor in the frequency range of T1 - T2 Hz;

[0580] According to the above formula, calculate the average value P rw12ave(1～500) , P rw12ave(501～1000) , P rw12ave(1001～1500) ,...P rw12ave(7501～8000) of the noise caused by the radial 12th - order space - order electromagnetic force of the drive motor under the conditions of the frequency ranges of 1 - 500 Hz, 501 - 1000 Hz, 1001 - 1500 Hz... 7501 - 8000 Hz, tw12ave(1～500) , P tw12ave(501～1000) , P tw12ave(1001～1500) ,...P tw12ave(7501～8000) .

[0581] Step 8.3.2) According to the average value of the noise caused by the radial 12th - order space - order electromagnetic force of the drive motor, the average value of the noise caused by the tangential 12th - order space - order electromagnetic force of the drive motor, and the average value of the bench - test noise target calculated in Step 8.3.1), set the target of the 12th - order space - order electromagnetic force of the drive motor in the frequency range of T1 - T2 Hz.

[0582] When P rw12ave(T1～T2) - P tw12ave(T1～T2) > 2 dB,

[0583] Radial 12th-order spatial-order electromagnetic force target P rw12tar(T1～T2) = 10^((P tarave(T1～T2) - P rw12max(T1～T2) ) /

[0584] 40) * 20000;

[0585] Tangential 12th-order spatial-order electromagnetic force target P tw12t(T1～T2) = 1500 * 6^2 Pa;

[0586] Where: P tw12max(T1～T2) Represents the maximum value of the noise caused by the radial 12th-order spatial-order electromagnetic force in the frequency range of T1 to T2 Hz;

[0587] When P rw12ave(T1～T2) - P tw12ave(T1～T2) < -4 dB,

[0588] Radial 12th-order spatial-order electromagnetic force target P rw12tar(T1～T2) = 5000 * ^2 Pa;

[0589] Tangential 12th-order spatial-order electromagnetic force target P tw12t(T1～T2) = 10^((P tarave(T1～T2) - P tw12max(T1～T2) ) / 40) * 8000;

[0590] When -4 dB < P rw12ave(T1～T2) - P tw12ave(T1～T2) < 2 dB,

[0591] Radial 12th-order spatial-order electromagnetic force target P rw12tar(T1～T2) = 10^(((P tarave(T1～T2) - 3) - P rw12ave(T1～T2) ) / 40) * 20000;

[0592] Tangential 12th-order spatial-order electromagnetic force target P tw12tar(T1～T2) = 10^(((P tarave(T1～T2) - 3) - P tw12ave(T1～T2) ) / 40) * 8000.

[0593] According to the above steps, calculate the radial spatial 12th-order electromagnetic force target P in the frequency ranges of 1 to 500 Hz, 501 to 1000 Hz, 1001 Hz to 1500 Hz,..., 7501 Hz to 8000 Hz at intervals of 500 Hz rw12tar(1～500) , P rw12tar(501～1000) , P rw12tar(1001～1500) ,....P rw12tar(7501～8000) , as well as the tangential spatial 12th-order electromagnetic force target P tw12tar(1～500) , P tw12tar(501～1000) , P tw12tar(1001～1500) ,....Ptw12tar(7501～8000) 。

[0594] Step 8.4) Set the target P of the radial 24th-order spatial harmonic electromagnetic force of the drive motor rw24tar(T1～T2) and the target P of the tangential 24th-order spatial harmonic electromagnetic force of the drive motor tw24tar(T1～T2) 。

[0595] Step 8.4.1) In the range of T1 to T2 Hz, calculate the average value of the noise caused by the radial 24th-order spatial harmonic electromagnetic force of the drive motor and the average value of the noise caused by the tangential 24th-order spatial harmonic electromagnetic force of the drive motor, respectively.

[0596] The formula for calculating the average value of the noise caused by the radial 24th-order spatial harmonic electromagnetic force of the drive motor is:[[]]

[0597]

[0598] The formula for calculating the average value of the noise caused by the tangential 24th-order spatial harmonic electromagnetic force of the drive motor is:[[]]

[0599]

[0600] Where: P rw24ave(T1～T2) is the average value of the noise caused by the radial 24th-order spatial harmonic electromagnetic force of the drive motor in the frequency range of T1 to T2 Hz, and P tw24ave(T1～T2) is the average value of the noise caused by the tangential 24th-order spatial harmonic electromagnetic force of the drive motor in the frequency range of T1 to T2 Hz;

[0601] According to the above formulas, calculate the average value P of the noise caused by the radial 24th-order spatial harmonic electromagnetic force of the drive motor under the conditions of the frequency ranges of 1 to 500 Hz, 501 to 1000 Hz, 1001 to 1500 Hz... 7501 to 8000 Hz rw24ave(1～500) , P rw24ave(501～1000) , P rw24ave(1001～1500) ,... P rw24ave(7501～8000) and the average value P of the noise caused by the tangential 24th-order spatial harmonic electromagnetic force of the drive motor tw24ave(1～500) , P tw24ave(501～1000) , P tw24ave(1001～1500) ,... P tw24ave(7501～8000) 。

[0602] Step 8.4.2) Set the target of the 24th-order spatial harmonic electromagnetic force of the drive motor in the frequency range of T1 to T2 Hz according to the average value of the noise caused by the radial 24th-order spatial harmonic electromagnetic force of the drive motor, the average value of the noise caused by the tangential 24th-order spatial harmonic electromagnetic force of the drive motor, and the average value of the bench noise target calculated in Step 8.4.1).

[0603] When P rw24ave(T1～T2) - P tw24ave(T1～T2) > 2 dB

[0604] Radial 24th-order spatial-order electromagnetic force target P rw24tar(T1～T2) = 10^((P tarave(T1～T2) - P rw24max(T1～T2) ) / 40) * 20000;

[0605] Tangential 24th-order spatial-order electromagnetic force target P tw24tar(T1～T2) = 1500 * 6^2 Pa;

[0606] Where: P rw24max(T1～T2) represents the maximum value of the noise caused by the radial 24th-order spatial-order electromagnetic force in the frequency range of T1 to T2 Hz;

[0607] When P rw24ave(T1～T2) - P tw24ave(T1～T2) < -4 dB,

[0608] Radial 24th-order spatial-order electromagnetic force target P rw24tar(T1～T2) = 5000 * 6^2 Pa;

[0609] Tangential 24th-order spatial-order electromagnetic force target P tw24tar(T1～T2) = 10^((P tarave(T1～T2) - P tw24max(T1～T2) ) /

[0610] 40) * 8000;

[0611] When -4 dB < P rw24ave(T11～T2) - P tw24ave(T1～T2) < 2 dB,

[0612] Radial 24th-order spatial-order electromagnetic force target P rw24tar(T1～T2) = 10^(((P tarave(T1～T2) - 3) - P rw24ave(T1～T2) ) / 40) * 20000;

[0613] Tangential 24th-order spatial-order electromagnetic force target P tw24tar(T1～T2) = 10^(((P tarave(T1～T2) - 3) - P tw24ave(T1～T2) ) / 40) * 8000.

[0614] According to the above steps, calculate the radial spatial 24th-order electromagnetic force target P in the frequency ranges of 1 to 500 Hz, 501 to 1000 Hz, 1001 Hz to 1500 Hz,..., 7501 Hz to 8000 Hz at intervals of 500 Hz rw24tar(1～500) , P rw24tar(501～1000) , P rw24tar(1001～1500) ,....P rw24tar(7501～8000) , as well as the tangential spatial 24th-order electromagnetic force target P tw24tar(1～500) , P tw24tar(501～1000) , Ptw24tar(1001～1500) ,....P tw24tar(7501～8000) 。

[0615] In this specific embodiment, since the number of poles of the motor = 8 and the number of stator slots is 72; therefore, there are only 8 orders of non-zero spatial order electromagnetic forces in this specific embodiment; the average noise caused by the 8th order radial spatial electromagnetic forces in each frequency range is shown in Table 8, and the average noise caused by the 8th order tangential spatial electromagnetic forces in each frequency range is shown in Table 9. The maximum noise caused by the 8th order radial spatial electromagnetic forces in each frequency range is shown in Table 10, and the maximum noise caused by the 8th order tangential spatial electromagnetic forces in each frequency range is shown in Table 11. The target values of the 8th order radial spatial electromagnetic forces calculated are shown in Table 12, and the target values of the 8th order tangential spatial electromagnetic forces calculated are shown in Table 13.

[0616] Table 8: Average noise caused by the 8th order radial spatial electromagnetic forces in each frequency range

[0617] Frequency range Hz 1～500 501～1000 1001～1500 1501～2000 2001～2500 2501～3000 3001～3500 3501～4000 Noise average dB 0.8 9.3 13.4 16.9 22.7 19.4 22.9 30.9 Frequency range Hz 4001～4500 4501～5000 5001～5500 5501～6000 6001～6500 6501～7000 7001～7500 7501～8000 Noise average dB 25.0 13.4 9.6 3.6 1.8 9.8 3.5 0.8

[0618] Table 9: Average noise caused by the 8th order tangential spatial electromagnetic forces in each frequency range

[0619] Frequency range Hz 1～500 501～1000 1001～1500 1501～2000 2001～2500 2501～3000 3001～3500 3501～4000 Noise average dB 35.6 30.5 38.7 35.0 31.0 29.9 31.0 25.6 Frequency range Hz 4001～4500 4501～5000 5001～5500 5501～6000 6001～6500 6501～7000 7001～7500 7501～8000 Noise average dB 16.6 10.7 7.1 2.8 2.1 9.4 2.4 6.2

[0620] Table 10: Maximum noise caused by the 8th order radial spatial electromagnetic forces in each frequency range

[0621] Frequency range Hz 1～500 501～1000 1001～1500 1501～2000 2001～2500 2501～3000 3001～3500 3501～4000 Noise average dB 9.6 12.4 20.0 19.8 26.3 22.2 23.9 35.6 Frequency range Hz 4001～4500 4501～5000 5001～5500 5501～6000 6001～6500 6501～7000 7001～7500 7501～8000 Noise average dB 30.0 15.5 12.7 6.9 0.7 6.3 0.6 0.1

[0622] Table 11: Maximum noise caused by the 8th order tangential spatial electromagnetic forces in each frequency range

[0623] Frequency range Hz 1～500 501～1000 1001～1500 1501～2000 2001～2500 2501～3000 3001～3500 3501～4000 Noise average dB 40.1 35.0 49.8 42.3 34.7 32.5 35.9 27.9 Frequency range Hz 4001～4500 4501～5000 5001～5500 5501～6000 6001～6500 6501～7000 7001～7500 7501～8000 Noise average dB 22.9 12.2 8.3 5.4 1.1 6.1 3.0 9.0

[0624] Table 12: Target values of the 8th order radial spatial electromagnetic forces calculated (unit: Pa)

[0625] Frequency range Hz 1～500 501～1000 1001～1500 1501～2000 2001～2500 2501～3000 3001～3500 3501～4000 Electromagnetic force target 320000 320000 320000 320000 320000 320000 320000 257600 Frequency range Hz 4001～4500 4501～5000 5001～5500 5501～6000 6001～6500 6501～7000 7001～7500 7501～8000 Electromagnetic force target 20400 32800 41400 37600 29200 41400 50400 320000

[0626] Table 13: Target values of the 8th order tangential spatial electromagnetic forces calculated (unit: Pa)

[0627] Frequency range Hz 1～500 501～1000 1001～1500 1501～2000 2001～2500 2501～3000 3001～3500 3501～4000 Electromagnetic force target 7730 18400 20500 45000 75500 80500 75500 96000 Frequency range Hz 4001～4500 4501～5000 5001～5500 5501～6000 6001～6500 6501～7000 7001～7500 7501～8000 Electromagnetic force target 96000 96000 96000 32200 42700 65000 43500 31500

[0628] Step 9) Calculate the electromagnetic force risk coefficient of the drive motor.

[0629] The calculation formula for the electromagnetic force risk coefficient of the drive motor is:

[0630] LME = Max(P rwsmax(T1～T2) / P rwtar(T1～T2) ) + Max(P twsmax(T1～T2) / P twtar(T1～T2)+Max(P rws6max(T1～T2) / P rw6tar(T1～T2 )+Max(P tws6max(T1～T2) / P tw6tar(T1～T2) +Max(P rws8max(T1～T2) / P rw8tar(T1～T2) +Max(P tws8max(T1～T2) / P tw8tar(T1～T2) )+Max(P rws12max(T1～T2) / P rw12tar(T1～T2 )+Max(P tws12max(T1～T2) / P tw12tar(T1～T2) )+Max(P rws24max(T1～T2) / P rw24ar(T1～T2) +Max(P tws24max(T1～T2) / P tw24tar(T1～T2) )

[0631] Where: LME represents the motor electromagnetic force risk coefficient, P rwsmax(T1～T2) represents the maximum value of the noise caused by the actual radial zero-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz; P twsmax(T1～T2) represents the maximum value of the noise caused by the actual tangential zero-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz; P rws6max(T1～T2) represents the maximum value of the noise caused by the actual radial 6th-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz; P tws6max(T1～T2) represents the maximum value of the noise caused by the actual tangential 6th-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz; P rws8max(T1～T2 ) represents the maximum value of the noise caused by the actual radial 8th-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz; P tws8max(T1～T2) represents the maximum value of the noise caused by the actual tangential 8th-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz; P rws12max(T1～T2) represents the maximum value of the noise caused by the actual radial 12th-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz; P tws12max(T1～T2) represents the maximum value of the noise caused by the actual tangential 12th-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz; P rws24max(T1～T2) represents the maximum value of the noise caused by the actual radial 24th-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz; P tws24max(T1～T2) represents the maximum value of the noise caused by the actual tangential 24th-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz.

[0632] In this specific embodiment, since the number of poles of the motor in this example = 8 and the number of stator slots is 72; the non-zero spatial order electromagnetic force is only 8th order. After removing the non-zero order and non-8th order electromagnetic force terms in the formula, the motor electromagnetic force risk coefficient is calculated:

[0633] LME = Max(P rwsmax(T1～T2) / P rwtar(T1～T2)) + Max(P twsmax(T1～T2) / P twtar(T1～T2) + Max(P rws8m(T1～T2) / P rw8t(T1～T2) + Max(P tws8max(T1～T2) / P tw(T1～T2) )

[0634] In this example, the radial space zero - order electromagnetic force and the radial space zero - order electromagnetic force curve actually calculated according to the motor design scheme are shown in Appendix Figure 19 and Appendix Figure 20 respectively. The calculated radial space 8th - order electromagnetic force and the radial space 8th - order electromagnetic force curve are shown in Appendix Figure 21 and Appendix Figure 22 respectively. The calculated motor electromagnetic force risk coefficient LME = 35.3 in this specific embodiment.

[0635] According to Table 14, score and grade the motor electromagnetic force risk coefficient.

[0636] Table 14: Score and Rating Table for Motor Electromagnetic Force Risk Coefficient

[0637]

[0638] In this specific embodiment, the score of the motor electromagnetic force risk coefficient is 4 points; the risk level is: high risk.

[0639] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Those of ordinary skill in the art should understand that any modifications or equivalent replacements made to the technical solutions of the present invention without departing from the purpose and scope of the technical solutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for analyzing the structural sensitivity of a drive motor of a new energy vehicle and the target of spatial order electromagnetic force, characterized in that It includes the following steps: Step 1) Apply a zero-order spatial-order electromagnetic excitation load to the drive motor; Step 2) Apply a non-zero-order spatial-order electromagnetic excitation load to the drive motor; Step 3) Calculate the zero-order spatial-order electromagnetic excitation structural sensitivity coefficient of the drive motor; Step 4) Calculate the non-zero-order spatial-order electromagnetic excitation structural sensitivity coefficient of the drive motor; Step 5) Calculate the multi-spatial-order electromagnetic excitation structural response consistency coefficient of the drive motor; Step 6) Analyze and evaluate the drive motor's structure-electromagnetic load excitation sensitivity; Step 7) Formulate the design target for the zero-order spatial-order electromagnetic force of the drive motor; Step 8) Formulate the design target for the non-zero-order spatial-order electromagnetic force of the drive motor; Step 9) Calculate the electromagnetic force risk coefficient of the drive motor.

2. The method for analyzing the structural sensitivity and spatial order electromagnetic force target of a drive motor for new energy vehicles according to claim 1, characterized in that Step 1) includes the method of applying a radial zero-order spatial-order electromagnetic excitation load and the method of applying a tangential zero-order spatial-order electromagnetic excitation load: The method of applying a radial zero-order spatial-order electromagnetic excitation load is: sequentially apply an electromagnetic force load of 1 N along the radial direction of the cylindrical coordinate system on each stator tooth of the drive motor, and the electromagnetic force loads in all radial directions have the same phase; The method of applying a tangential zero-order spatial-order electromagnetic excitation load is: sequentially apply an electromagnetic force load of 1 N along the tangential direction of the cylindrical coordinate system on each stator tooth of the drive motor, and the electromagnetic force loads in all tangential directions have the same phase.

3. The method for analyzing the structural sensitivity and spatial order electromagnetic force target of a drive motor for new energy vehicles according to claim 1, characterized in that Step 2) includes the 6th-order spatial-order electromagnetic excitation load application method, the 8th-order spatial-order electromagnetic force excitation load application method, the 12th-order spatial-order electromagnetic excitation load application method, and the 24th-order spatial-order electromagnetic excitation load application method; The 6th-order spatial-order electromagnetic excitation load application method includes the radial 6th-order spatial-order electromagnetic excitation load application method and the tangential 6th-order spatial-order electromagnetic excitation load application method; The 8th-order spatial-order electromagnetic excitation load application method includes the radial 8th-order spatial-order electromagnetic excitation load application method and the tangential 8th-order spatial-order electromagnetic excitation load application method; The 12th-order spatial-order electromagnetic excitation load application method includes the radial 12th-order spatial-order electromagnetic excitation load application method and the tangential 12th-order spatial-order electromagnetic excitation load application method; The 24th-order spatial-order electromagnetic excitation load application method includes the radial 24th-order spatial-order electromagnetic excitation load application method and the tangential 24th-order spatial-order electromagnetic excitation load application method.

4. The method for analyzing the structural sensitivity and spatial order electromagnetic force target of a drive motor for new energy vehicles according to claim 3, wherein The method for applying the radial 6th-order spatial-order electromagnetic excitation load is as follows: divide N stator teeth within the circumferential range of 360° into 6 equal parts, with each spatial part corresponding to N / 6 stator teeth. Apply an electromagnetic force load of 1 N along the radial direction of the cylindrical coordinate system on the stator teeth of the drive motor in sequence, and the phase difference of the electromagnetic force applied between adjacent two stator teeth within each spatial part is The method for applying the tangential 6th-order spatial-order electromagnetic excitation load is as follows: Divide N stator teeth within the circumferential range of 360° into 6 equal parts, with each spatial part corresponding to N / 6 stator teeth. Apply an electromagnetic force load of 1N tangentially along the stator teeth of the drive motor in sequence, and the phase difference of the electromagnetic force between adjacent two stator teeth applied within each spatial part is The method for applying the radial 8th-order spatial-order electromagnetic excitation load is as follows: Divide N stator teeth within the circumferential range of 360° into 8 equal parts, with each spatial part corresponding to N / 8 stator teeth. Apply an electromagnetic force load of 1N along the radial direction of the cylindrical coordinate system on the stator teeth of the drive motor in sequence, and the phase difference of the electromagnetic force between adjacent two stator teeth applied within each spatial part is The method for applying the tangential 8th-order spatial-order electromagnetic excitation load is as follows: Divide N stator teeth within the circumferential range of 360° into 8 equal parts, with each spatial part corresponding to N / 8 stator teeth. Apply an electromagnetic force load of 1N tangentially along the stator teeth of the drive motor in sequence, and the phase difference of the electromagnetic force between adjacent two stator teeth applied within each spatial part is The method for applying the electromagnetic excitation load of the 12th spatial order in the radial direction is as follows: divide N stator teeth within the circumferential range of 360° into 12 equal parts, with each part of the space corresponding to N / 12 stator teeth. Apply an electromagnetic force load of 1N to the stator teeth of the drive motor along the radial direction of the cylindrical coordinate system in sequence, and the phase difference of the electromagnetic force between adjacent two stator teeth applied within each part of the space is The method for applying the tangential 12th-order spatial-order electromagnetic excitation load is as follows: Divide the N stator teeth within the 360° circumferential range into 12 equal parts, with each part of the space corresponding to N / 12 stator teeth. Apply an electromagnetic force load of 1 N tangentially along the stator teeth of the drive motor in sequence, and the phase difference of the electromagnetic force between adjacent two stator teeth applied within each part of the space is The method for applying the radial 24th-order spatial-order electromagnetic excitation load is as follows: divide N stator teeth within the 360° circumferential range into 24 equal parts, each spatial part corresponding to N / 24 stator teeth, and sequentially apply an electromagnetic force load of 1N along the radial direction of the cylindrical coordinate system on the stator teeth of the drive motor, and the phase difference of the electromagnetic force between adjacent two stator teeth applied within each spatial part is The method for applying the tangential 24th-order spatial-order electromagnetic excitation load is as follows: Divide N stator teeth within the 360° circumferential range into 24 equal parts, with each part of the space corresponding to N / 24 stator teeth. Apply an electromagnetic force load of 1 N tangentially along the stator teeth of the drive motor in sequence, and the phase difference of the electromagnetic force between adjacent two stator teeth applied within each part of the space is 5. The method for analyzing the structural sensitivity and spatial order electromagnetic force target of a driving motor for new energy vehicles according to claim 1, wherein Step 3) includes the following steps: Step 3.1) Discretize the outer surface of the drive motor structure into triangular elements; Step 3.2) Calculate the total vibration energy of the outer surface of the drive motor under the action of the radial zero-order spatial-order electromagnetic excitation at each excitation frequency, and the noise caused by the total vibration energy of the outer surface of the drive motor under the action of the radial zero-order spatial-order electromagnetic excitation; Step 3.3) Calculate the total vibration energy of the outer surface of the drive motor under the action of the tangential zero-order spatial-order electromagnetic excitation at each excitation frequency, and the noise caused by the total vibration energy of the outer surface of the drive motor under the action of the tangential zero-order spatial-order electromagnetic excitation; Step 3.4) Calculate the zero-order spatial-order electromagnetic excitation structural sensitivity coefficient of the drive motor.

6. The method for analyzing the structural sensitivity and spatial order electromagnetic force target of a drive motor for new energy vehicles according to claim 5, wherein Step 3.2) includes the following steps: Step 3.2.1) Set the excitation frequency of the radially zero-order spatial-order electromagnetic excitation load after application to THz to perform vibration excitation on the entire drive motor, record the average vibration velocity of all discretized triangular elements, and record them as v rT1 , v rT2 ,..., v rTK , where K is the total number of discretized triangular elements, T is the excitation frequency, and T = 1 Hz, 2 Hz, 3 Hz,..., 8000 Hz; Step 3.2.2) Calculate the total vibration energy of the outer surface of the drive motor at each excitation frequency under the action of the radial zero-order spatial-order electromagnetic excitation: Where: L rw-0-THz represents the total vibration energy of the outer surface of the entire drive motor calculated according to the radial zero-order spatial-order electromagnetic excitation under the condition that the excitation frequency is THz; Si is the area of the discretized triangular element; Step 3.2.3) Calculate the noise caused by the vibration in Step 3.2.2) according to the magnitude of the excitation frequency; Step 3.3) includes the following steps: Step 3.3.1) Set the excitation frequency of the applied tangential zero-order spatial-order electromagnetic excitation load to THz to perform vibration excitation on the entire drive motor, record the average vibration velocity of all discretized triangular elements, and record them as v tT1 , v tT2 ,..., v tTK ; Step 3.3.2) Calculate the total vibration energy of the outer surface of the drive motor at each excitation frequency under the action of the tangential zero-order spatial-order electromagnetic excitation: Where: L tw-0-THz represents the total vibration energy of the outer surface of the entire drive motor calculated according to the tangential zero-order spatial-order electromagnetic excitation under the condition that the excitation frequency is THz; Step 3.3.3) Calculate the noise caused by the vibration in Step 3.3.2) according to the magnitude of the excitation frequency.

7. The method for analyzing the structural sensitivity and spatial order electromagnetic force target of a drive motor for new energy vehicles according to claim 6, characterized in that In Step 3.2.3), the method for calculating the noise caused by the vibration in Step 3.2.2) according to the magnitude of the excitation frequency is as follows: When the excitation frequency T ≤ 2000 Hz, calculate the noise based on the following formula: P rw-0-THz = L rw-0-1Hz -8 + log(T / 2000) Where: P rw-0-THz represents the noise caused by the total vibration energy on the outer surface of the drive motor under the action of the radial zero-order spatial-order electromagnetic excitation when the excitation frequency is THz; When the excitation frequency T > 2000 Hz, calculate the noise based on the following formula: P rw-0-THz = L rw-0-THz - 8; In Step 3.3.3), the method for calculating the noise caused by the vibration in Step 3.2.2) according to the magnitude of the excitation frequency is: When the excitation frequency T ≤ 2000 Hz, calculate the noise based on the following formula: P tw-0-THz = L tw-0-1Hz -8 + log(T / 2000) Where: P tw-0-THz represents the noise caused by the total vibration energy on the outer surface of the drive motor under the action of the tangential zero-order spatial-order electromagnetic excitation when the excitation frequency is THz; When the excitation frequency T > 2000 Hz, calculate the noise based on the following formula: P tw-0-THz = L tw-0-THz - 8; In Step 3.4), calculate the sensitivity coefficient of the zero-order spatial-order electromagnetic excitation structure of the drive motor according to the following formula: DD0 = 1.2 * average(P rw-0-THz ) + Max(P rw-0-THz ) + 0.8 * (1.2 * average(P tw-0-THz ) + Max(P tw-0-THz )) In the formula: DD0 represents the sensitivity coefficient of the zero-order spatial-order electromagnetic excitation structure of the drive motor.

8. The method for analyzing the structural sensitivity and spatial order electromagnetic force target of a drive motor for a new energy vehicle according to claim 7, wherein Step 4) includes the following steps: Step 4.1) Discretize the outer surface of the drive motor structure into triangular elements; Step 4.2) Calculate the sensitivity coefficient DD6 of the 6th-order spatial-order electromagnetic excitation structure of the drive motor; Step 4.3) Calculate the sensitivity coefficient DD8 of the 8th-order spatial-order electromagnetic excitation structure of the drive motor; Step 4.4) Calculate the sensitivity coefficient DD of the 12th-order spatial harmonic electromagnetic excitation structure of the driving motor 12 ; Step 4.5) Calculate the sensitivity coefficient DD of the electromagnetic excitation structure of the 24th spatial order of the drive motor 24 ; Step 4.6) Calculate the sensitivity coefficient of the non-zero-order spatial-order electromagnetic excitation structure of the drive motor based on the following formula: DD x = 0.2 * DD6 + 0.6 * DD8 + DD 12 + 2 * DD 24 where: DD x is the calculated sensitivity coefficient of the non-zero order spatial order electromagnetic excitation structure of the drive motor.

9. The method for analyzing the structural sensitivity and spatial order electromagnetic force target of a drive motor for a new energy vehicle according to claim 8, characterized in that Step 4.2) includes the following steps: Step 4.2.1) Set the excitation frequency of the radially 6th-order spatial-order electromagnetic excitation load after application to THz to perform vibration excitation on the entire drive motor, and record the average vibration velocity of all discretized triangular elements, which are respectively recorded as v 6rT1 , v 6rT2 ,..., v 6rTK , where K is the total number of discretized triangular elements, T is the excitation frequency, and T = 1 Hz, 2 Hz, 3 Hz,..., 8000 Hz; Step 4.2.2) Calculate the total vibration energy of the outer surface of the drive motor at each excitation frequency under the action of the radial 6th-order spatial-order electromagnetic excitation load: Where: L rw-6-THz represents the total vibration energy of the outer surface of the entire drive motor calculated according to the radial 6th-order spatial-order electromagnetic excitation under the condition that the excitation frequency is THz; Si is the area of the discretized triangular element; Step 4.2.3) Calculate the noise caused by the vibration in Step 4.2.2): When the excitation frequency T ≤ 2000 Hz, calculate the noise based on the following formula: P rw-6-THz = L rw-6-1Hz -8 + log(T / 2000) Where: P rw-6-THz represents the noise caused by the total vibration energy on the outer surface of the drive motor under the action of the radial 6th-order spatial-order electromagnetic excitation at the excitation frequency of THz; When the excitation frequency T > 2000 Hz, calculate the noise based on the following formula: P rw-6-THz = L rw-6-THz - 8; Step 4.2.4) Set the excitation frequency of the applied tangential 6th-order spatial-order electromagnetic excitation load to THz to perform vibration excitation on the entire drive motor, record the average vibration velocity of all discretized triangular elements, and record them as v 6tT1 、v 6tT2 、...、v 6tTK ; Step 4.2.5) Calculate the total vibration energy of the outer surface of the drive motor at each excitation frequency under the action of the tangential 6th-order spatial-order electromagnetic excitation load: Where: L tw-6-THz represents the total vibration energy of the outer surface of the entire driving motor calculated according to the tangential 6th-order spatial-order electromagnetic excitation under the condition that the excitation frequency is THz; Step 4.2.6) Calculate the noise caused by the vibration in Step 4.2.5): When the excitation frequency T ≤ 2000 Hz, calculate the noise based on the following formula: P tw-6-THz = L tw-6-1Hz -8 + log(T / 2000) Where: P tw-6-THz represents the noise caused by the total vibration energy on the outer surface of the drive motor under the action of the tangential 6th-order spatial-order electromagnetic excitation at the excitation frequency of THz; When the excitation frequency T > 2000 Hz, calculate the noise based on the following formula: P tw-6-THz = L tw-6-THz - 8; In Step 4.2.7), calculate the sensitivity coefficient of the 6th-order spatial-order electromagnetic excitation structure of the drive motor according to the following formula: DD6 = 1.2 * average(P rw-6-THz ) + Max(P rw-6-THz ) + 0.8 * (1.2 * average(P tw-6-THz ) + Max(P tw-6-THz )) In the formula: DD6 represents the sensitivity coefficient of the 6th-order spatial-order electromagnetic excitation structure of the drive motor.

10. The method for analyzing the structural sensitivity and spatial order electromagnetic force target of a drive motor for a new energy vehicle according to claim 9, wherein Step 4.3) includes the following steps: Step 4.3.1) Set the excitation frequency of the radially 8th-order spatial-order electromagnetic excitation load after application to THz to perform vibration excitation on the entire drive motor, record the average vibration velocity of all discretized triangular elements, and record them as v 8rT1 , v 8rT2 ,..., v 8rTK , where K is the total number of discretized triangular elements, T is the excitation frequency, and T = 1 Hz, 2 Hz, 3 Hz,..., 8000 Hz; Step 4.3.2) Calculate the total vibration energy of the outer surface of the drive motor at each excitation frequency under the action of the radial 8th-order spatial-order electromagnetic excitation load: where: L rw-8-THz represents the total vibration energy of the outer surface of the entire drive motor calculated according to the radial 8th-order spatial-order electromagnetic excitation under the condition that the excitation frequency is THz; Si is the area of the discretized triangular element; Step 4.3.3) Calculate the noise caused by the vibration in Step 4.3.2): When the excitation frequency T ≤ 2000 Hz, calculate the noise based on the following formula: P rw-8-THz = L rw-8-1Hz -8 + log(T / 2000) Where: P rw-8-THz represents the noise caused by the total vibration energy on the outer surface of the drive motor under the action of the radial 8th-order spatial-order electromagnetic excitation when the excitation frequency is THz; When the excitation frequency T > 2000 Hz, calculate the noise based on the following formula: P rw-8-THz = L rw-8-THz - 8; Step 4.3.4) Set the excitation frequency of the applied tangential 8th-order spatial-order electromagnetic excitation load to THz to perform vibration excitation on the entire drive motor, record the average vibration velocity of all discretized triangular elements, and record them as v 8tT1 , v 8tT2 ,..., v 8tTK ; Step 4.3.5) Calculate the total vibration energy of the outer surface of the drive motor at each excitation frequency under the action of the tangential 8th-order spatial-order electromagnetic excitation load: Where: L tw-g-THz represents the total vibration energy of the outer surface of the entire drive motor calculated according to the tangential 8th-order spatial-order electromagnetic excitation under the condition that the excitation frequency is THz; Step 4.3.6) Calculate the noise caused by the vibration in Step 4.3.5): When the excitation frequency T ≤ 2000 Hz, calculate the noise based on the following formula: P tw-8-THz = L tw-8-1Hz -8 + log(T / 2000) Where: P tw-8-THz represents the noise caused by the total vibration energy on the outer surface of the drive motor under the action of the 8th-order tangential spatial-order electromagnetic excitation at the excitation frequency of THz; When the excitation frequency T > 2000 Hz, calculate the noise based on the following formula: P tw-8-THz = L tw-8-THz - 8; In Step 4.3.7), calculate the structural sensitivity coefficient of the 8th-order spatial-order electromagnetic excitation of the drive motor according to the following formula: DD8 = 1.2 * average(P rw-8-THz ) + Max(P rw-8-THz ) + 0.8 * (1.2 * average(P tw-8-THz ) + Max(P tw-8-THz )) Where: DD8 represents the structural sensitivity coefficient of the 8th-order spatial-order electromagnetic excitation of the drive motor.

11. The method for analyzing the structural sensitivity and spatial order electromagnetic force target of a drive motor for new energy vehicles according to claim 10, wherein Step 4.4) includes the following steps: Step 4.4.1) Set the excitation frequency of the radially 12th-order spatial-order electromagnetic excitation load after application to THz to perform vibration excitation on the entire drive motor, record the average vibration velocity of all discretized triangular elements, and record them as v 12rT1 , v 12rT2 ,..., v 12rTK , where K is the total number of discretized triangular elements, T is the excitation frequency, and T = 1 Hz, 2 Hz, 3 Hz,..., 8000 Hz; Step 4.4.2) Calculate the total vibration energy of the outer surface of the drive motor at each excitation frequency under the action of the radial 12th-order spatial-order electromagnetic excitation load: Where: L rw-12-THz represents the total vibration energy of the outer surface of the entire drive motor calculated according to the 12th-order radial spatial-order electromagnetic excitation under the condition that the excitation frequency is THz; Si is the area of the discretized triangular element; Step 4.4.3) Calculate the noise caused by the vibration in Step 4.4.2): When the excitation frequency T ≤ 2000 Hz, calculate the noise based on the following formula: P rw-12-THz = L rw-12-1H -8 + log(T / 2000) Where: P rw-12-TH represents the noise caused by the total vibration energy on the outer surface of the drive motor under the action of the radial 12th-order spatial-order electromagnetic excitation when the excitation frequency is THz; When the excitation frequency T > 2000 Hz, calculate the noise based on the following formula: P rw-12-THz = L rw-12-THz - 8; Step 4.4.4) Set the excitation frequency of the applied tangential 12th-order spatial-order electromagnetic excitation load to THz to perform vibration excitation on the entire drive motor, and record the average vibration velocity of all discretized triangular elements, which are respectively recorded as v 12tT1 、v 12tT2 、...、v 12tTK ; Step 4.4.5) Calculate the total vibration energy of the outer surface of the drive motor at each excitation frequency under the action of the tangential 12th-order spatial-order electromagnetic excitation load: Where: L tw-12-THz represents the total vibration energy of the outer surface of the entire drive motor calculated according to the 12th-order tangential spatial-order electromagnetic excitation under the condition that the excitation frequency is THz; Step 4.4.6) Calculate the noise caused by the vibration in Step 4.4.5): When the excitation frequency T ≤ 2000 Hz, calculate the noise based on the following formula: P tw-12-TH = L tw-12-1Hz -8 + log(T / 2000) Where: P tw-12-THz represents the noise caused by the total vibration energy on the outer surface of the drive motor under the action of the 12th-order tangential spatial-order electromagnetic excitation at the excitation frequency of THz; When the excitation frequency T > 2000 Hz, calculate the noise based on the following formula: P tw-12-THz = L tw-12-TH - 8; In Step 4.4.7), calculate the structural sensitivity coefficient of the 12th-order spatial-order electromagnetic excitation of the drive motor according to the following formula: DD 12 = 1.2 * average(P rw-12-THz ) + Max(P rw-12-THz ) + 0.8 * (1.2 * average(P tw-12-THz ) + Max(P tw-12-THz )) Where: DD 12 represents the sensitivity coefficient of the electromagnetic excitation structure of the 12th spatial order of the driving motor.

12. The method for analyzing the structural sensitivity and spatial order electromagnetic force target of a drive motor for a new energy vehicle according to claim 11, wherein Step 4.5) includes the following steps: Step 4.5.1) Set the excitation frequency of the radially 24th-order spatial-order electromagnetic excitation load after application to THz to perform vibration excitation on the entire drive motor, record the average vibration velocity of all discretized triangular elements, and record them as v 24rT1 , v 24rT2 ,..., v 24rTK , where K is the total number of discretized triangular elements, T is the excitation frequency, and T = 1 Hz, 2 Hz, 3 Hz,..., 8000 Hz; Step 4.5.2) Calculate the total vibration energy of the outer surface of the drive motor at each excitation frequency under the action of the radial 24th-order spatial-order electromagnetic excitation load: Where: L rw-24-THz represents the total vibration energy of the outer surface of the entire driving motor calculated according to the 24th-order radial spatial-order electromagnetic excitation under the condition that the excitation frequency is THz; Si is the area of the discretized triangular element; Step 4.5.3) Calculate the noise caused by the vibration in Step 4.5.2): When the excitation frequency T ≤ 2000 Hz, calculate the noise based on the following formula: P rw-24-THz = L rw-24-1Hz -8 + log(T / 2000) Where: P rw-24-THz represents the noise caused by the total vibration energy on the outer surface of the drive motor under the action of the 24th-order radial spatial-order electromagnetic excitation at the excitation frequency of THz; When the excitation frequency T > 2000 Hz, calculate the noise based on the following formula: P rw-24-THz = L rw-24-THz - 8; Step 4.5.4) Set the excitation frequency of the applied tangential 24th-order spatial-order electromagnetic excitation load to THz to perform vibration excitation on the entire drive motor, record the average vibration velocity of all discretized triangular elements, and record them as v 24tT1 , v 24tT2 ,..., v 24tTK ; Step 4.5.5) Calculate the total vibration energy of the outer surface of the drive motor at each excitation frequency under the action of the tangential 24th-order spatial-order electromagnetic excitation load: Where: L tw-24-THz represents the total vibration energy of the outer surface of the entire driving motor calculated according to the tangential 24th-order spatial-order electromagnetic excitation under the condition that the excitation frequency is THz; Step 4.5.6) Calculate the noise caused by the vibration in Step 4.5.5): When the excitation frequency T ≤ 2000 Hz, calculate the noise based on the following formula: P tw-24-TH = L tw-24-1Hz -8 + log(T / 2000) where: P tw-24-THz represents the noise caused by the total vibration energy on the outer surface of the drive motor under the action of the 24th-order tangential spatial-order electromagnetic excitation at the excitation frequency of THz; When the excitation frequency T > 2000 Hz, calculate the noise based on the following formula: P tw-24-THz = L tw-24-THz - 8; In step 4.5.7), calculate the sensitivity coefficient of the 24th-order spatial harmonic electromagnetic excitation structure of the drive motor according to the following formula: DD 24 = 1.2 * average(P rw-24-THz ) + Max(P rw-24-THz ) + 0.8 * (1.2 * average(P tw-24-THz ) + Max(P tw-24-THz )) In the formula: DD 24 represents the sensitivity coefficient of the electromagnetic excitation structure of the 24th spatial order of the drive motor.

13. The method for analyzing the structural sensitivity and spatial order electromagnetic force target of a drive motor for new energy vehicles according to claim 12, wherein In step 5), calculate the response consistency coefficient of the multi-spatial harmonic electromagnetic excitation structure of the drive motor according to the following formula: Tre = (DD0 - DD6) / (20 * Log(5)) + (DD0 - DD8) / (20 * Log(7)) + (DD0 - DD 12 ) / (20 * Log(11)) + (DD0 - DD 24 ) / (20 * Log(23)) Where: Tre represents the response consistency coefficient of the multi-spatial harmonic electromagnetic excitation structure of the drive motor.

14. The method for analyzing the structural sensitivity and spatial order electromagnetic force target of a drive motor for a new energy vehicle according to claim 13, wherein In step 6), calculate the sensitivity coefficient of the drive motor structure-electromagnetic load excitation according to the following formula: LMD = Tre + 1 / DD0 + 1 / DD x Where: LMD represents the sensitivity coefficient of the drive motor structure-electromagnetic load excitation; Analyze and evaluate the drive motor structure-electromagnetic load excitation sensitivity based on the drive motor structure-electromagnetic load excitation sensitivity coefficient.

15. The method for analyzing the structural sensitivity and spatial order electromagnetic force target of a drive motor for new energy vehicles according to claim 14, wherein, Step 7) includes the following steps: Step 7.1): In the range of T1~T2 Hz, calculate the average value of the noise caused by the radial zero-order spatial harmonic electromagnetic force of the drive motor, the average value of the noise caused by the tangential zero-order spatial harmonic electromagnetic force of the drive motor, and the average value of the bench noise target respectively. T1 = 1 Hz, 501 Hz, 1001 Hz, 1501 Hz... 7501 Hz, and T2 - T1 = 499 Hz; Step 7.2): Based on the average value of the noise caused by the radial zero-order spatial harmonic electromagnetic force of the drive motor, the average value of the noise caused by the tangential zero-order spatial harmonic electromagnetic force of the drive motor, and the average value of the bench noise target calculated in step 7.1), formulate the zero-order spatial harmonic electromagnetic force target of the drive motor in the frequency range of T1~T2 Hz.

16. The method for analyzing the structural sensitivity and spatial order electromagnetic force target of a driving motor for new energy vehicles according to claim 15, characterized in that In step 7.1), the calculation formula for the average value of the noise caused by the radial zero-order spatial harmonic electromagnetic force of the drive motor is: The calculation formula for the average value of the noise caused by the tangential zero-order spatial harmonic electromagnetic force of the drive motor is: The calculation formula for the average value of the bench noise target is: Where: P rwave(T1～T2) is the average value of the noise caused by the radial zero-order spatial order electromagnetic force of the drive motor in the frequency range of T1 to T2 Hz, P twave(T1～T2) is the average value of the noise caused by the tangential zero-order spatial order electromagnetic force of the drive motor in the frequency range of T1 to T2 Hz, P tarave(T1～T2) is the average value of the bench noise target in the frequency range of T1 to T2 Hz, P tari represents the noise target value under the condition that the frequency is i Hz; In step 7.2), when P rwave(T1～T2) - P twave(T1～T2) > 0 dB, Radial zero-order spatial-order electromagnetic force target P rwtar(T1～T2) = 10^((P tarave(T1～T2) - P rwmax(T1～T2) ) / 20) * 1000; Tangential zero-order spatial-order electromagnetic force target P twtar(T1～T2) = 1500 Pa; Where: P rwmax(T1～T2) represents the maximum value of the noise caused by the radial zero-order spatial order electromagnetic force in the frequency range of T1 to T2 Hz; When P rwave(T1～T2) -P twave(T1～T2) <-6 dB, Radial zero-order spatial-order electromagnetic force target P rwtar(T1～T2) = 5000 Pa; Tangential zero-order spatial-order electromagnetic force target P twt(T1～T2) = 10^((P tarave(T1～T2) - P twmax(T1～T2) ) / 20) * 300; Where: P twmax(T1～T2) represents the maximum value of the noise caused by the tangential zero-order spatial-order electromagnetic force in the frequency range of T1 to T2 Hz; When -6dB < P rwave(T1～T2) -P twave(T1～T2) < 0dB, Radial zero-order spatial-order electromagnetic force target P rwtar(T1～T2) = 10^(((P tarave(T1～T2) - 3) - P rwmax(T1～T2) ) / 20) * 1000; Tangential zero-order spatial-order electromagnetic force target P twtar(T1～T2) = 10^(((P tarave(T1～T2) - 3) - P twmax(T1～T2) ) / 20) * 300。 17. The method for analyzing the structural sensitivity and spatial order electromagnetic force target of a drive motor for new energy vehicles according to claim 16, wherein Step 8) includes the following steps: Step 8.1) Define the target P of the radial 6th-order spatial harmonic electromagnetic force of the drive motor rw6tar(T1～T2) and the target P of the tangential 6th-order spatial harmonic electromagnetic force tw6tar(T1～T2) ; Step 8.2) Set the target P of the radial 8th-order spatial harmonic electromagnetic force of the drive motor rw8tar(T1～T2) and the target P of the tangential 8th-order spatial harmonic electromagnetic force tw8tar(T1～T2) ; Step 8.3) Set the target P of the 12th-order spatial harmonic electromagnetic force in the radial direction of the drive motor rw12tar(T1～T2) and the target P of the 12th-order spatial harmonic electromagnetic force in the tangential direction tw12tar(T1～T2) ; Step 8.4) Define the target P of the 24th-order space-order electromagnetic force in the radial direction of the drive motor rw24tar(T1～T2) and the target P of the 24th-order space-order electromagnetic force in the tangential direction tw24tar(T1～T2) .

18. The method for analyzing the structural sensitivity and spatial order electromagnetic force target of a drive motor for new energy vehicles according to claim 17, wherein Step 8.1) includes the following steps: Step 8.1.1): In the range of T1~T2 Hz, calculate the average value of the noise caused by the radial 6th-order spatial harmonic electromagnetic force of the drive motor and the average value of the noise caused by the tangential 6th-order spatial harmonic electromagnetic force of the drive motor respectively. Step 8.1.2): Based on the average value of the noise caused by the radial 6th-order spatial harmonic electromagnetic force of the drive motor, the average value of the noise caused by the tangential 6th-order spatial harmonic electromagnetic force of the drive motor, and the average value of the bench noise target calculated in step 8.1.1), formulate the 6th-order spatial harmonic electromagnetic force target of the drive motor in the frequency range of T1~T2 Hz. Step 8.2) includes the following steps: Step 8.2.1): In the range of T1~T2 Hz, calculate the average value of the noise caused by the radial 8th-order spatial harmonic electromagnetic force of the drive motor and the average value of the noise caused by the tangential 8th-order spatial harmonic electromagnetic force of the drive motor respectively. Step 8.2.2): Based on the average value of the noise caused by the radial 8th-order spatial harmonic electromagnetic force of the drive motor, the average value of the noise caused by the tangential 8th-order spatial harmonic electromagnetic force of the drive motor, and the average value of the bench noise target calculated in step 8.2.1), formulate the 8th-order spatial harmonic electromagnetic force target of the drive motor in the frequency range of T1~T2 Hz. Step 8.3) includes the following steps: Step 8.3.1) In the range of T1 to T2 Hz, calculate the average value of the noise caused by the radial 12th-order spatial harmonic electromagnetic force of the drive motor and the average value of the noise caused by the tangential 12th-order spatial harmonic electromagnetic force of the drive motor respectively; Step 8.3.2) Based on the average value of the noise caused by the radial 12th-order spatial harmonic electromagnetic force of the drive motor, the average value of the noise caused by the tangential 12th-order spatial harmonic electromagnetic force of the drive motor, and the average value of the bench noise target calculated in Step 8.3.1), formulate the 12th-order spatial harmonic electromagnetic force target of the drive motor in the frequency range of T1 to T2 Hz; Step 8.4) includes the following steps: Step 8.4.1) In the range of T1 to T2 Hz, calculate the average value of the noise caused by the radial 24th-order spatial harmonic electromagnetic force of the drive motor and the average value of the noise caused by the tangential 24th-order spatial harmonic electromagnetic force of the drive motor respectively; Step 8.4.2) Based on the average value of the noise caused by the radial 24th-order spatial harmonic electromagnetic force of the drive motor, the average value of the noise caused by the tangential 24th-order spatial harmonic electromagnetic force of the drive motor, and the average value of the bench noise target calculated in Step 8.4.1), formulate the 24th-order spatial harmonic electromagnetic force target of the drive motor in the frequency range of T1 to T2 Hz.

19. The method for analyzing the structural sensitivity and spatial order electromagnetic force target of a driving motor for new energy vehicles according to claim 18, wherein In Step 8.1.1), the formula for calculating the average value of the noise caused by the radial 6th-order spatial harmonic electromagnetic force of the drive motor is: The formula for calculating the average value of the noise caused by the tangential 6th-order spatial harmonic electromagnetic force of the drive motor is: Where: P rw6ave(T1～T2) is the average value of the noise caused by the radial 6th-order spatial harmonic electromagnetic force of the drive motor in the frequency range of T1 to T2 Hz, and P tw6ave(T1～T2) is the average value of the noise caused by the tangential 6th-order spatial harmonic electromagnetic force of the drive motor in the frequency range of T1 to T2 Hz; In step 8.1.2), when P rw6ave(T1～T2) -P tw6ave(T1～T2) > 2 dB, Radial 6th-order spatial-order electromagnetic force target P rw6tar(T1～T2) = 10^((P tarave(T1～T2) - P rw6max(T1～T2) ) / 40) * 20000; Tangential 6th-order spatial-order electromagnetic force target P tw6tar(T1～T2) = 1500 * 6^2 Pa; Where: P rw6max(T1～T2) represents the maximum value of the noise caused by the radial 6th-order spatial-order electromagnetic force in the frequency range of T1 to T2 Hz; When P rw6ave(T1～T2) -P tw6ave(T1～T2) <-4 dB, Radial 6th-order spatial-order electromagnetic force target P rw6tar(T1～T2) = 5000 * 6^2 Pa; Tangential 6th-order spatial-order electromagnetic force target P tw6(T1～T2) = 10^((P tarave(T1～T2) - P tw6max(T1～T2) ) / 40) * 8000; When -4dB < P rw(T11～T2) -P tw6a(T1～T2) < 2dB, Radial 6th-order spatial-order electromagnetic force target P rw6tar(T1～T2) = 10^(((P tarave(T1～T2) - 3)- P rw6ave(T1～T2) ) / 40)*20000; Tangential 6th-order Spatial-order Electromagnetic Force Target P tw6tar(T1～T2) = 10^(((P tarave(T1～T2) - 3)- P tw6av(T1～T2) ) / 40) * 8000; In Step 8.2.1), the formula for calculating the average value of the noise caused by the radial 8th-order spatial harmonic electromagnetic force of the drive motor is: The formula for calculating the average value of the noise caused by the tangential 8th-order spatial harmonic electromagnetic force of the drive motor is: Where: P rw8ave(T1～t2) is the average value of the noise caused by the radial 8th-order spatial harmonic electromagnetic force of the drive motor in the frequency range of T1 to T2 Hz, and P tw8ave(T1～T2) is the average value of the noise caused by the tangential 8th-order spatial harmonic electromagnetic force of the drive motor in the frequency range of T1 to T2 Hz; In step 8.2.2), when P rw8ave(T1～T2) - P tw8(T1～T2) > 2 dB, Radial 8th-order spatial-order electromagnetic force target P rw8tar(T1～T2) = 10^((P tarave(T1～T2) - P rw8max(t1～T2) ) / 40) * 20000; Tangential 8th-order spatial-order electromagnetic force target P tw8ta(T1～T2) = 1500 * 6^2 Pa; Where: P rw8max(T1～T2) represents the maximum value of the noise caused by the radial 8th-order spatial harmonic electromagnetic force in the frequency range of T1 to T2 Hz; When P rw8ave(T1～T2) -P tw8ave(T1～T2) <-4 dB, Radial 8th-order spatial-order electromagnetic force target P rw8tar(T1～T2) = 5000 * 6^2 Pa; Tangential 8th-order Spatial-order Electromagnetic Force Target P tw8tar(T1～T2) = 10^((P tarave(T1～T2) - P tw8max(T1～T2) ) / 40) * 8000; When -4dB < P rw8ave(T1～T2) -P tw8ave(T1～T2) < 2dB, Radial 8th-order spatial-order electromagnetic force target P rw8tar(T1～T2) = 10^(((P tarave(T1～T2) - 3)- P rw8ave(T1～T2) ) / 40)*20000 Tangential 8th-order spatial harmonic electromagnetic force target P tw8(T1～T2) = 10^(((P tarave(T1～T2) - 3) - P tw8ave(T1～T2) ) / 40) * 8000; In Step 8.3.1), the formula for calculating the average value of the noise caused by the radial 12th-order spatial harmonic electromagnetic force of the drive motor is: The formula for calculating the average value of the noise caused by the tangential 12th-order spatial harmonic electromagnetic force of the drive motor is: Where: P rw12ave(T1～T2) is the average value of the noise caused by the radial 12th-order spatial-order electromagnetic force of the drive motor in the frequency range of T1 to T2 Hz, and P tw12ave(T1～T2) is the average value of the noise caused by the tangential 12th-order spatial-order electromagnetic force of the drive motor in the frequency range of T1 to T2 Hz; In step 8.3.2), when P rw12ave(T1～T2) - P tw12ave(T1～T2) > 2 dB, Radial 12th-order spatial-order electromagnetic force target P rw12tar(T1～T2) = 10^((P tarave(T1～T2) - P rw12max(T1～T2) ) / 40) * 20000; Tangential 12th-order spatial-order electromagnetic force target P tw12tar(T1～T2) = 1500 * 6^2 Pa; Where: P rw12max(T1～T2) represents the maximum value of the noise caused by the radial 12th-order spatial harmonic electromagnetic force in the frequency range of T1 to T2 Hz; When P rw12ave(T1～T2) -P tw12ave(T1～T2) <-4 dB, Radial 12th-order spatial-order electromagnetic force target P rw12tar(T1～T2) = 5000 * 6^2 Pa; Tangential 12th-order spatial-order electromagnetic force target P tw12tar(T1～T2) = 10^((P tarave(T1～T2) - P tw12max(T1～t2) ) / 40) * 8000; When -4dB < P rw12ave(T1～T2) -P tw12ave(T1～T2) < 2dB, Radial 12th-order spatial-order electromagnetic force target P rw12tar(T1～T2) = 10^(((P tarave(T1～T2) - 3)- P rw12ave(T1～T2) ) / 40) * 20000; Tangential 12th-order spatial harmonic electromagnetic force target P tw12tar(T1～T2) = 10^(((P tarave(T1～T2) - 3)-P tw12ave(T1～T2) ) / 40)*8000; In Step 8.4.1), the formula for calculating the average value of the noise caused by the radial 24th-order spatial harmonic electromagnetic force of the drive motor is: The formula for calculating the average value of the noise caused by the tangential 24th-order spatial harmonic electromagnetic force of the drive motor is: Where: P rw24ave(T1～T2) is the average value of the noise caused by the radial 24th spatial order electromagnetic force of the drive motor in the frequency range of T1 to T2 Hz, and P tw24ave(T1～T2) is the average value of the noise caused by the tangential 24th spatial order electromagnetic force of the drive motor in the frequency range of T1 to T2 Hz; In step 8.4.2), when P rw24ave(T1～T2) -P tw24ave(T1～T2) > 2 dB, Radial 24th-order spatial-order electromagnetic force target P rw24tar(T1～T2) = 10^((P tarave(T1～T2) - P rw24max(T1～T2) ) / 40) * 20000; Tangential 24th-order spatial-order electromagnetic force target P tw24tar(T1～T2) = 1500 * 6^2 Pa; Where: P rw24max(T1～T2) represents the maximum value of the noise caused by the radial 24th-order spatial-order electromagnetic force in the frequency range of T1 to T2 Hz; When P rw24ave(T1～T2) -P tw24ave(T1～T2) <-4 dB, Radial 24th-order spatial-order electromagnetic force target P rw24tar(T1～T2) = 5000 * 6^2 Pa; Tangential 24th-order spatial-order electromagnetic force target P tw24tar(T1～T2) = 10^((P tarave(T1～T2) - P tw24max(T1～T2) ) / 40) * 8000; When -4dB < P rw24ave(T11～T2) -P tw24ave(T1～T2) < 2dB, Radial 24th-order spatial-order electromagnetic force target P rw24tar(T1～T2) = 10^(((P tarave(T1～T2) - 3)- P rw24ave(T1～T2) ) / 40)*20000; Tangential 24th-order spatial harmonic electromagnetic force target P tw24t(T1～T2) = 10^(((P tarave(T1～T2) - 3)-P tw24ave(T1～T2) ) / 40) * 8000。 20. The method for analyzing the structural sensitivity and spatial order electromagnetic force target of a driving motor for new energy vehicles according to claim 19, wherein In Step 9), the formula for calculating the electromagnetic force risk coefficient of the drive motor is: LME = Max(P rwsmax(T1～T2) / P rwtar(T1～T2) ) + Max(P twsmax(T1～T2) / P twtar(T1～T2) ) + Max(P rws6max(T1～T2) / P rw6t(T1～T2 ) + Max(P tws6max(T1～T2) / P tw6tar(T1～T2) ) + Max(P rws8max(T1～T2) / P rw8t(T1～T2 ) + Max(P tws8max(T1～T2) / P tw8tar(T1～T2) ) + Max(P rws12max(T1～T2) / P rw12tar(T1～T2 ) + Max(P tws12max(T1～T2) / P tw12tar(T1～T2) ) + Max(P rws24max(T1～T2) / P rw24ar(T1～T2 ) + Max(P tws24max(T1～T2) / P tw24tar(T1～T2) ) Where: LMF represents the risk coefficient of the motor electromagnetic force, P rwsmax(T1～T2) represents the maximum value of the noise caused by the actual radial zero-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz; P twsmax(T1～T2) represents the maximum value of the noise caused by the actual tangential zero-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz; P rws6max(T1～T2) represents the maximum value of the noise caused by the actual radial 6th-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz; P tws6max(T1～T2) represents the maximum value of the noise caused by the actual tangential 6th-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz; P rws8max(T1～T2) represents the maximum value of the noise caused by the actual radial 8th-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz; P tws8max(T1～T2) represents the maximum value of the noise caused by the actual tangential 8th-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz; P rws12max(T1～T2) represents the maximum value of the noise caused by the actual radial 12th-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz; P tws12max(T1～T2) represents the maximum value of the noise caused by the actual tangential 12th-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz; P rws24max(T1～T2) represents the maximum value of the noise caused by the actual radial 24th-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz; P tws24max(T1～T2) represents the maximum value of the noise caused by the actual tangential 24th-order spatial order electromagnetic force of the drive motor scheme within the frequency range of T1 to T2 Hz.

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