Method and system for separating and measuring ac copper losses and iron losses of an electric machine

Abstract

The application provides a method and system for separating and measuring AC copper loss and iron loss of a motor, comprising: manufacturing a partial stator body of an N-line and 2N-line motor per slot as a test object; testing total loss data and external circuit characteristic parameters of the partial stator body per slot under a load operation; obtaining a difference value of AC copper loss; correcting a simulation model of AC copper loss of the motor by using the obtained difference value of AC copper loss, and outputting AC copper loss of the motor per slot under different rotating speeds and different torques; performing no-load testing by using a non-magnetic rotor to obtain no-load loss; obtaining iron core loss according to the total loss, copper loss and no-load loss obtained by testing the N-line and 2N-line stator; correcting an iron core loss simulation model of the motor by using the obtained iron core loss value, and outputting the iron core loss of the motor per slot under different rotating speeds and different torques. The application can separate and calculate the AC copper loss and the iron core loss of the motor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of motor loss testing, in particular to a partial stator testing device for separating and measuring alternating current copper loss and iron loss, and more particularly to a method and system for separating and measuring alternating current copper loss and iron loss of a motor. BACKGROUND

[0002] With the development of new energy vehicle motors towards high speed, the synchronous growth of electromagnetic base frequency increases the winding alternating current copper loss and the iron core loss, which challenges the accuracy of motor efficiency design and thermal analysis. The alternating current copper loss in the motor is generated under the background of complex magnetic field, which has spatial harmonic components and time domain high frequency harmonic interference. In addition, the alternating magnetic field not only produces alternating current copper loss, but also produces iron core loss in the magnetic circuit. The two kinds of losses are coupled and difficult to separate and measure directly.

[0003] In order to accurately and effectively analyze the efficiency and manage the heat of the motor, the variation of alternating current copper loss and iron core loss needs to be obtained. However, the whole machine test, especially the winding difficulty, high cost and long test period when using flat wire winding, therefore a new device is needed to improve the test efficiency and accuracy. SUMMARY

[0004] In view of the defects in the prior art, the present application provides a method and system for separating and measuring alternating current copper loss and iron loss of a motor.

[0005] According to the method and system for separating and measuring alternating current copper loss and iron loss of a motor provided by the present application, the scheme is as follows:

[0006] In a first aspect, a method for separating and measuring alternating current copper loss and iron loss of a motor is provided, the method comprising: a motor rotor and two partial stator bodies consistent with the shape of the complete stator of the motor to be tested, each partial stator body containing at least one slot number corresponding to a pole pair, symmetrically arranged on both sides of the rotor, and the motor to be tested has N winding wires per slot, the measurement method comprising:

[0007] Step S101: making partial stator bodies of N-line and 2N-line motors per slot, i.e. N-line and 2N-line motor partial stator bodies as test objects, the total copper conductor cross section in the slots of the two is the same;

[0008] Step S102: testing the total loss data and external circuit characteristic parameters generated by the N-line motor and 2N-line motor partial stator bodies under load operation, the speed and current at each test point are consistent;

[0009] Step S103: obtaining the difference of alternating current copper loss according to the difference of total loss under the same current test of N-line motor and 2N-line motor partial stator bodies or the difference of winding equivalent resistance in external circuit characteristic;

[0010] Step S104: correcting the AC copper loss simulation model of the N-line motor and the 2N-line motor by using the obtained AC copper loss difference value, and outputting the AC copper loss of the N-line motor and the 2N-line motor under different rotating speeds and different torques;

[0011] Step S105: performing no-load test on the partial stator body of the N-line motor and the 2N-line motor using the non-shock-excited rotor, and obtaining the no-load loss;

[0012] Step S106: obtaining the core loss of the partial stator body of the N-line motor and the 2N-line motor under different test points according to the total loss, the copper loss and the no-load loss obtained by the test of the partial stator body of the N-line motor and the 2N-line motor;

[0013] Step S107: correcting the core loss simulation model of the N-line motor and the 2N-line motor by using the obtained core loss value, and outputting the core loss of the N-line motor and the 2N-line motor under different rotating speeds and different torques.

[0014] Preferably, in the rotating speed control, the rotating speed of the armature magnetic field and the rotor magnetic field of the partial stator body is consistent;

[0015] The synchronous rotating angle of the armature magnetic field and the rotor magnetic field between the partial stator body of the N-line motor and the 2N-line motor at each test point is consistent.

[0016] Preferably, the step S102 comprises: obtaining the total loss of the two tested devices according to the difference between the input power and the output power of the tested motor by the torque and rotating speed sensors installed between the drag motor and the tested motor;

[0017] The input active power of the motor is obtained by the input current and the input voltage:

[0018] P0=U0I0cosφ

[0019] Wherein, P0 is the input active power of the motor, U0 is the input voltage, I0 is the input current, and φ is the phase angle of the input voltage and the input current;

[0020] The output power of the tested motor is obtained by the torque and rotating speed sensors installed between the drag motor and the tested motor according to the following formula:

[0021]

[0022] Wherein, P m is the output power of the motor, T is the torque, and n is the rotating speed (r / min);

[0023] The total loss of the tested device is obtained according to the input active power and the output power:

[0024] P=P0-Pm

[0025] Wherein, P is the total loss of the motor, P0 is the input active power of the motor, P m is the output power.

[0026] Preferably, the step S103 comprises: obtaining the difference value ΔP e of the AC copper loss under each speed and current value by the total loss difference of the partial stator of the N-line motor and the 2N-line motor while keeping the speed and the current size consistent.

[0027] Preferably, the step S103 further comprises: obtaining the difference value ΔR of the equivalent resistance of the winding of the partial stator of the N-line motor and the 2N-line motor according to the size of the terminal voltage and the phase of the current by the external circuit characteristics of the partial stator of the N-line motor and the 2N-line motor while keeping the speed and the current size consistent, and the difference value ΔP e of the AC copper loss under each speed and current value can also be calculated according to the following formula:

[0028] ΔP e = nI 2 ΔR

[0029] Wherein, ΔP e is the difference value of the AC copper loss, n is the number of motor phases, and I is the effective value of the current.

[0030] Preferably, the step S105 comprises: replacing the rotor with an un-magnetized rotor, driving the rotor by the drag motor, and measuring the no-load loss under each speed and current value according to the torque and speed sensor, which is the sum of the wind friction loss, bearing loss and stray loss:

[0031]

[0032] Wherein, P f is the no-load loss, T1 is the torque, and n1 is the speed (r / min).

[0033] Preferably, the step S106 comprises: subtracting the no-load loss and the winding AC copper loss from the total loss of the partial stator and the full rotor structure to obtain the core loss:

[0034] P Fe = P-P e -P f

[0035] Wherein, P Fe is the core loss of the motor, P is the total loss of the motor, P e is the AC copper loss of the motor, and P f is the no-load loss of the motor.

[0036] The second aspect provides a system for separating and measuring AC copper loss and iron loss of a motor, comprising: a motor rotor, two opposite partial stator bodies, a rotating shaft, a winding blocking ring, rectangular wires, a partial stator body clamp and a counter motor.

[0037] The counter motor is connected with the rotating shaft, and the motor rotor rotates around the rotating shaft between the partial stator body clamps.

[0038] The two partial stator bodies are symmetrically arranged on both sides of the motor rotor.

[0039] The winding blocking ring is arranged at both ends of the motor rotor, and the rectangular wires are wound on the partial stator bodies.

[0040] Preferably, the contour features of the two partial stator bodies are consistent with the shape of the motor to be measured, and each partial stator body contains at least one slot number corresponding to a pole pair number.

[0041] A torque speed sensor is arranged between the motor rotor and the counter motor.

[0042] The rectangular wires of the two symmetrically arranged partial stator bodies are oppositely wound.

[0043] Especially preferably, the two partial stator bodies are symmetrically arranged on both sides of the complete motor rotor, and the original air gap length between the motor rotor is ensured, and the partial stator body clamp is made of non-magnetic material.

[0044] Especially preferably, the test device composed of the two partial stator bodies and the motor rotor is used to test two-phase, three-phase and multi-phase windings.

[0045] Especially preferably, the motor rotor is connected with the counter motor during the test, and the counter motor generates a load force or a driving force under no load.

[0046] Preferably, the partial stator bodies are respectively wound with N-line and 2N-line conductors in each slot to form N-line and 2N-line motors; during winding, the two stator bodies are oppositely wound, and the N-line winding conductor height is twice the 2N-line winding conductor height, and the total copper cross section of the conductors in each slot is kept equal.

[0047] The 2N-line winding is two-wire parallel winding on the connecting wire, that is, the current of the N-line motor single wire is consistent with the current of the 2N-line motor double wire, and the average current density is consistent.

[0048] Especially preferably, the rotational speed of the magnetic field of the partial stator body is consistent with the rotational speed of the rotor magnetic field during speed control.

[0049] Compared with the prior art, the present application has the following advantages:

[0050] The application restores the electromagnetic environment inside the motor through the structure of the opposite partial stator body and the complete rotor, and can perform opposite cross winding, avoids the problem that the short side of the rectangular conductor is difficult to bend, greatly reduces the test difficulty, cost and period, and realizes the separation and calculation of the motor AC copper loss and the core loss through the difference of the AC copper loss between the four-wire motor and the eight-wire motor.

[0051] Other beneficial effects of the application will be described in the specific embodiments through the introduction of specific technical features and technical solutions, and those skilled in the art should understand the beneficial technical effects brought by the technical features and technical solutions through the introduction of the technical features and technical solutions. BRIEF DESCRIPTION OF DRAWINGS

[0052] Other features, objects and advantages of the application will become more apparent through reading the detailed description of the non-limiting embodiments with reference to the following drawings:

[0053] Figure 1 The separation and measurement method steps diagram for the motor AC copper loss and the core loss;

[0054] Figure 2 The physical diagram of the motor partial stator body testing device;

[0055] Figure 3 The physical diagram of the motor partial stator body;

[0056] Figure 4 The physical diagram of the motor rotating shaft;

[0057] Figure 5 The physical diagram of the motor rotor;

[0058] Figure 6 The physical diagram of the winding blocking ring;

[0059] Figure 7 The physical diagram of the motor partial stator body clamp;

[0060] Figure 8 The physical diagram of the motor no-load testing device;

[0061] Figures 9a-9b The physical diagram of the conductor of the motor with N wires per slot and the motor with 2N wires per slot;

[0062] Figures 10a-10b The winding schematic diagram of the original eight-wire motor and the original four-wire motor;

[0063] Figure 11 The winding connection mode schematic diagram of the original eight-wire motor;

[0064] Figure 12 The winding connection mode schematic diagram of the eight-wire motor of the application.

[0065] 1, motor rotor; 2, partial stator body; 3, rotating shaft; 4, winding blocking ring; 5, rectangular wire; 6, partial stator body clamp. DETAILED DESCRIPTION

[0066] The application will be described in detail below with specific examples. The following examples will help those skilled in the art to further understand the application, but do not limit the application in any form. It should be noted that for those skilled in the art, without departing from the concept of the application, a number of changes and improvements can be made. These are within the scope of the present application.

[0067] Example 1:

[0068] The embodiment of the application provides a system for separating and measuring the AC copper loss and iron loss of a motor. Figure 1 and Figure 2 The system specifically comprises a motor rotor 1, two opposing partial stator bodies 2, a rotating shaft 3, a winding blocking ring 4, a rectangular wire 5, a partial stator body clamp 6, and a motoring motor. Figure 3 , 4 , 5, 6, 7, which respectively show the specific structures of the partial stator body 2, the rotating shaft 3, the motor rotor 1, the winding blocking ring 4, and the partial stator body clamp 6.

[0069] The motoring motor is connected with the rotating shaft 3, and the motor rotor 1 rotates around the rotating shaft 3 between the partial stator body clamps 6.

[0070] The two partial stator bodies 2 are symmetrically arranged on both sides of the motor rotor 1.

[0071] The winding blocking ring 4 is arranged at both ends of the motor rotor 1, can guide the winding of the rectangular wire 5, and avoid interference with the motor rotor 1 in the test; the rectangular wire 5 is wound on the partial stator body 2.

[0072] Referring to Figure 3 , the contour features of the two partial stator bodies 2 are consistent with the shape of the motor to be measured, and each partial stator body 2 contains at least one slot corresponding to a pole pair number.

[0073] The motor rotor 1 is arranged with a torque speed sensor between the motoring motor.

[0074] Referring to Figure 2 , the two partial stator bodies 2 are symmetrically arranged on both sides of the complete motor rotor 1, and the original air gap length between the motor rotor 1 is ensured, and the rectangular wires 5 of the two symmetrically arranged partial stator bodies 2 are oppositely wound. The partial stator body clamp 6 is made of non-magnetic materials such as aluminum and organic materials.

[0075] The test device composed of two partial stator bodies 2 and the motor rotor 1 is used to test two-phase, three-phase and multi-phase windings.

[0076] During the test, the motor rotor 1 is connected to a counter motor to generate a load force or a driving force under no load.

[0077] The partial stator body 2 is wound with N conductors and 2N conductors respectively to form an N conductor motor and a 2N conductor motor.

[0078] During the speed control, the armature magnetic field of the partial stator body 2 is consistent with the rotating speed of the rotor magnetic field.

[0079] The application further provides a method for separating and measuring the AC copper loss and the iron loss of a motor. Figure 1 The motor AC copper loss and iron loss separating and measuring partial stator test device comprises a complete motor rotor 1 and two partial stator bodies which are consistent with the complete stator shape of the motor to be tested.

[0080] Step S101: manufacturing partial stator bodies of N conductor and 2N conductor (2 conductor parallel winding) motors in each slot, i.e.

[0081] Step S102: testing the total loss data and external circuit characteristic parameters generated by the N conductor motor and the 2N conductor motor partial stator bodies under load operation, and keeping the rotating speed and current consistent at each test point.

[0082] During the speed control, the armature magnetic field of the partial stator body 2 is consistent with the rotating speed of the rotor magnetic field.

[0083] In the speed control, the synchronous rotation angle of the armature magnetic field and the rotor magnetic field between the N-line motor and the partial stator of the 2N-line motor at each test point is consistent. For example, id=0, to ensure that the rotor magnetic field and the partial stator magnetic field maintain the same angle of 90 degrees during the operation of the N-line motor and the 2N-line motor. For another example, in the field weakening operation, the rotor magnetic field and the partial stator armature magnetic field of the N-line motor and the 2N-line motor maintain the same field weakening angle.

[0084] In this step S102, the total loss of the two test devices is obtained according to the difference between the power input and the power output of the measured motor through the torque and speed sensors installed between the drag motor and the measured motor.

[0085] Specifically, the N-line motor partial stator and the 2N-line motor partial stator are respectively tested at different operating points under the condition of maintaining the consistency of the speed n and the current I.

[0086] The input active power of the motor is obtained from the input current and the input voltage according to the following formula:

[0087] P0=U0I0 cosφ

[0088] Where P0 is the input active power of the motor, U0 is the input voltage, I0 is the input current, and φ is the phase angle of the input voltage and the input current.

[0089] The output power of the measured motor is obtained from the torque and speed sensors installed between the drag motor and the measured motor according to the following formula:

[0090]

[0091] Where P m is the output power of the motor, T is the torque, and n is the speed (rpm).

[0092] The total loss of the test device is obtained according to the input active power and the output power:

[0093] P=P0-P m

[0094] Where P is the total loss of the motor, P0 is the input active power of the motor, and P m is the output power.

[0095] Step S103: According to the difference in the total loss of the N-line motor and the 2N-line motor partial stator under the equal current test or the difference in the winding equivalent resistance in the external circuit characteristics, the difference in the AC copper loss is obtained.

[0096] The step S103 comprises: obtaining the difference ΔP of the AC copper loss at each speed and current value by the total loss difference of the partial stator of the N-line motor and the 2N-line motor while keeping the speed and current value of both consistent. e ;

[0097] The step S103 can also obtain the difference ΔR of the equivalent resistance of the partial stator winding of the N-line motor and the 2N-line motor according to the size of the terminal voltage and the phase of the current by the external circuit characteristics of the partial stator of the N-line motor and the 2N-line motor while keeping the speed and current value of both consistent, and the difference ΔP of the AC copper loss at each speed and current value can also be calculated according to the following formula e :

[0098] ΔP e =nI 2 ΔR

[0099] Wherein, n is the number of motor phases, and I is the current effective value.

[0100] Step S104: correcting the AC copper loss simulation model of the N-line motor and the 2N-line motor with the obtained difference of the AC copper loss, and outputting the AC copper loss of the N-line motor and the 2N-line motor at different speeds and different torques.

[0101] Step S105: referring to Figure 8 and Figures 9a-9b , using the non-magnetized rotor to perform no-load test on the partial stator of the N-line motor and the 2N-line motor to obtain the no-load loss, i.e. the wind friction loss, bearing loss and other stray loss.

[0102] The step S105 comprises: replacing the rotor with a non-magnetized rotor, driving the rotor by the drag motor, and measuring the no-load loss, i.e. the sum of the wind friction loss, bearing loss and stray loss, at each speed and current value according to the torque and speed sensor:

[0103]

[0104] Wherein, P f is the no-load loss, T1 is the torque, and n1 is the speed (r / min).

[0105] Step S106: obtaining the core loss of the partial stator of the N-line motor and the 2N-line motor at different test points according to the total loss, copper loss and no-load loss obtained by testing the partial stator of the N-line motor and the 2N-line motor.

[0106] The step S106 comprises: subtracting the no-load loss and the winding AC copper loss from the total loss of the partial stator and the full rotor structure to obtain the core loss:

[0107] P Fe=PP e -P f

[0108] Among them, P Fe P represents the core loss of the motor, and P represents the total loss of the motor. e For AC copper losses in the motor, P f This refers to the no-load loss of the motor.

[0109] Step S107: Use the obtained core loss values ​​to correct the core loss simulation models of the N-line motor and the 2N-line motor, and output the core loss of the N-line and 2N-line motors at different speeds and torques.

[0110] Example 2:

[0111] This embodiment provides a more detailed description of the present invention based on the above embodiments.

[0112] The following explanation uses N=4, that is, a motor with four wires per slot and a motor with eight wires per slot in part of the stator, as examples, referred to as a four-wire motor and an eight-wire motor.

[0113] like Figure 2 As shown, two stator sections are symmetrically arranged, maintaining the original air gap length between the stator sections and the rotor, and the windings are performed in opposite directions between the two stator sections.

[0114] like Figures 10a-10b The diagram shows the original windings of a four-wire motor and an eight-wire motor with two pole pairs. Each pole has one slot per phase, meaning one parallel slot. The windings on the left and right sides are named "A1+, B1-, C1+, A1-, B1+, C1-" and "A2+, B2-, C2+, A2-, B2+, C2-", respectively. The phase arrangement of the four-wire motor windings is the same as that of the eight-wire motor described above.

[0115] like Figure 11 The diagram shown is a schematic of the original winding connections for an eight-wire motor. During winding, the windings are connected sequentially as follows: "A1+~A1-, B1-~B1+, C1+~C1-, A2+~A2-, B2-~B2+, C2+~C2-". The wiring method for the windings of a four-wire motor is the same as that for the eight-wire motor.

[0116] The eight-wire motor winding method used in this invention is as follows: Figure 12 As shown, the windings are connected in opposite directions via cross connections, following the sequence "A1+~A2-, B1-~B2+, C1+~C2-, A1-~A2+, B1+~B2-, C1-~C2+". The connection method for the four-wire motor windings is the same as that for the eight-wire motor described above.

[0117] like Figures 9a-9b , Figures 10a-10bAs shown, in shape, the four-wire motor and the eight-wire motor have equal-width wires, the conductor height of the four-wire motor winding is twice that of the eight-wire motor winding, and the total cross section of the copper conductor in each slot is equal. The eight-wire motor adopts two-wire parallel winding to keep the average current density consistent with that of the four-wire motor. Among them, Figure 9a is the winding wire of the eight-wire (2N-wire) motor, Figure 9b is the winding wire of the four-wire (N-wire) motor.

[0118] The motor AC copper loss and core loss separation and measurement method provided by the application is suitable for permanent magnet synchronous motors, asynchronous AC motors, radial magnetic field motors and axial magnetic field motors, and when N=4, it includes:

[0119] S101, a partial stator body of a four-wire motor and an eight-wire motor is made as a test object, and the total copper conductor cross section in the slot is the same.

[0120] S102, total loss data and external circuit characteristic parameters of the four-wire and eight-wire (two-wire parallel winding) partial stator under test load operation are tested, and the speed and current are consistent at each test point.

[0121] Among them, when the speed is controlled, the magnetic field of the partial stator body and the rotation speed of the rotor magnetic field should be consistent, and it is necessary to ensure that the rotor magnetic field and the magnetic field of the partial stator body maintain an electrical angle of 90 degrees during motor operation, and the electrical angle is adjusted through a phase difference; the eight-wire winding adopts two-wire parallel connection on the connecting wire, that is, the current passing through the single wire of the four-wire motor and the double wire of the eight-wire motor is consistent, and the average current density is consistent; under the fixed speed n and current I, the corresponding terminal voltage data of the four-wire motor and the eight-wire motor are obtained.

[0122] According to the following formula, the input active power P0 of the motor is obtained from the input current I0, the input voltage U0 and the phase difference angle φ:

[0123] P0=U0I0 cosφ

[0124] According to the torque T and the speed n measured by the torque speed sensor installed between the drag motor and the measured motor, the output power P of the measured motor is obtained by the following formula: m

[0125]

[0126] According to the input active power P0 and the output power P m , the total loss P of the motor is obtained:

[0127] P=P0-Pm

[0128] S103, the difference between the total losses of the partial stator bodies of the four-wire motor and the eight-wire motor is calculated, that is, the AC copper loss difference ΔP e is obtained.​

[0129] In addition, the equivalent resistance difference ΔR of the four-wire and eight-wire motor part stator windings can be derived based on the input voltage amplitude and the phase angle of the input current obtained under the equal load test of equal current and equal speed of the four-wire motor part stator and the eight-wire motor part stator at different operating points, and the difference in AC copper loss at each speed and current value is calculated according to the current effective value I, the number of motor phases n, by the following formula:

[0130] ΔP e =nI 2 ΔR

[0131] S104, correct the AC copper loss simulation model of the motor using the obtained AC copper loss difference, and output the AC copper loss of the four-wire motor and the eight-wire motor at different speeds and different torques.

[0132] The AC copper loss model is calculated in the finite element electromagnetic simulation software.

[0133] S105, use the unshocked rotor to perform no-load test to obtain wind friction loss, bearing loss and other stray loss at the same speed.

[0134] Wherein, during the no-load test, the original rotor is replaced by an unshocked rotor, which is driven by the motor rotor, and the torque T1 and the speed n1 (r / min) measured by the torque speed sensor are used to calculate the no-load loss, i.e. the sum of the wind friction loss, bearing loss and stray loss P1:

[0135]

[0136] S106, according to the total loss, copper loss and no-load loss obtained by testing the four-wire and eight-wire motor stator, the core loss is obtained.

[0137] Wherein, according to the total loss P, the no-load loss P f and the corresponding winding copper loss P e , the core loss P Fe is calculated by the following formula:

[0138] P Fe =P-P e -P f

[0139] S107, correct the core loss simulation model of the motor using the obtained core loss value, and output the core loss of the four-wire motor and the eight-wire motor at different speeds and different torques.

[0140] Wherein, the core loss model is calculated in the finite element electromagnetic simulation software.

[0141] The embodiment of the present application provides a method and system capable of separating and measuring AC copper loss and iron loss of a motor, the electromagnetic environment inside the motor is restored through the structure of the partial stator body and the complete rotor, meanwhile, the opposite cross winding can be carried out, the problem that the short side of the rectangular conductor is difficult to bend is avoided, the test difficulty, cost and period are greatly reduced, the AC copper loss, the iron loss of the motor are separated and calculated through the difference between the four-wire motor and the eight-wire motor.

[0142] Those skilled in the art know that, in addition to implementing the system provided by the present application and each device, module and unit thereof in the form of pure computer readable program code, the system provided by the present application and each device, module and unit thereof can also be implemented in the form of logic gate, switch, application specific integrated circuit, programmable logic controller and embedded microcontroller, etc. by logically programming the method steps to achieve the same function. Therefore, the system provided by the present application and each device, module and unit thereof can be considered as a hardware component, and the devices, modules and units included therein for achieving various functions can also be considered as structures in the hardware component; the devices, modules and units for achieving various functions can also be considered as both software modules for implementing the method and structures in the hardware component.

[0143] The specific embodiments of the present application are described above. It needs to be understood that the present application is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essential content of the present application. The embodiments of the present application and the features in the embodiments can be combined with each other in any way without conflict.

Claims

1. A method of separating and measuring the AC copper losses and iron losses of an electrical machine, characterized in that, The method comprises the following steps: Step S101: manufacturing the partial stator body of the N-wire motor and the partial stator body of the 2N-wire motor, i.e. taking the partial stator body of the N-wire motor and the partial stator body of the 2N-wire motor as test objects, and the total copper conductor section in the slots of the two is the same; Step S102: testing the total loss data and the external circuit characteristic parameters generated by the partial stator body of the N-wire motor and the partial stator body of the 2N-wire motor under load operation, and keeping the rotation speed and the current consistent at each test point; Step S103: obtaining the difference of the AC copper loss according to the difference of the total loss of the partial stator body of the N-wire motor and the partial stator body of the 2N-wire motor under the same current test or the difference of the winding equivalent resistance in the external circuit characteristic; Step S104: correcting the AC copper loss simulation model of the N-wire motor and the 2N-wire motor by using the difference of the AC copper loss, and outputting the AC copper loss of the N-wire motor and the 2N-wire motor under different rotation speeds and different torques; Step S105: testing the no-load loss of the partial stator body of the N-wire motor and the partial stator body of the 2N-wire motor by using the non-magnetic rotor; Step S106: obtaining the core loss of the partial stator body of the N-wire motor and the partial stator body of the 2N-wire motor at different test points according to the total loss, the AC copper loss and the no-load loss obtained by testing the partial stator body of the N-wire motor and the partial stator body of the 2N-wire motor; Step S107: correcting the core loss simulation model of the N-wire motor and the 2N-wire motor by using the obtained core loss value, and outputting the core loss of the N-wire motor and the 2N-wire motor under different rotation speeds and different torques. In the rotation speed control, the rotation speed of the armature magnetic field and the rotation speed of the rotor magnetic field of the partial stator body are consistent; 2. The method of claim 1, wherein, The synchronous rotation angle of the armature magnetic field and the rotor magnetic field of the partial stator body of the N-wire motor and the partial stator body of the 2N-wire motor at each test point is consistent. The step S102 comprises the following steps: obtaining the total loss of the two test devices according to the difference between the input power and the output power of the measured motor by the torque and rotation speed sensors installed between the drag motor and the measured motor; 3. The method of claim 1, wherein, The input active power of the motor is obtained according to the input current and the input voltage: The output power of the measured motor is obtained according to the following formula by the torque and rotation speed sensors installed between the drag motor and the measured motor: wherein, P is the input active power to the motor, V is the input voltage, I is the input current, φ is the phase angle of the input voltage and input current; The total loss of the test device is obtained according to the input active power and the output power: wherein, P is the motor output power, T is the torque, N is the rotational speed (revolutions per minute); The step S105 comprises the following steps: replacing the rotor with a non-magnetic rotor, driving the rotor by the drag motor, and obtaining the no-load loss, i.e. the sum of the windage loss, the bearing loss and the stray loss, according to the torque and rotation speed sensors at each rotation speed and current value: wherein, is the total motor losses, is the motor input active power, is the output power.

4. The method of claim 1, wherein, The step S103 comprises: obtaining the difference of the AC copper loss under each speed and current value through the total loss difference of the part stator body of the N-line motor and the 2N-line motor while keeping the speed and the current size consistent. .

5. The method of claim 1, wherein, The step S103 further comprises: through the external circuit characteristics of the N-phase motor and the partial stator body of the 2N-phase motor, under the condition that the rotation speeds of the two are consistent and the current sizes are consistent, according to the size of the terminal voltage and the phase of the current, the equivalent resistance difference value of the N-phase motor and the partial stator body winding of the 2N-phase motor is obtained , and the difference value of the AC copper loss under each rotation speed and current value can also be calculated by the following formula : wherein, is the number of motor phases, is the current effective value.

6. The method of claim 1, wherein, The step S106 comprises the following steps: obtaining the core loss by subtracting the no-load loss and the AC copper loss from the total loss of the partial stator and the full rotor structure: wherein, is the no-load loss, is the torque, is the rotational speed (revolutions / minute).

7. The method of claim 1, wherein, The motor rotor (1), the two opposite partial stator bodies (2), the rotation shaft (3), the winding blocking ring (4), the rectangular wire (5), the partial stator body clamp (6) and the drag motor. wherein, is the motor iron loss, is the motor total loss, is the motor AC copper loss, is the motor no-load loss.

8. A system for separating and measuring AC copper losses and iron losses of an electrical machine, based on the method for separating and measuring AC copper losses and iron losses of an electrical machine according to any one of claims 1-7, characterized in that, ​ ​ The pair of drag motors is connected with the rotating shaft (3), and the motor rotor (1) rotates around the rotating shaft (3) between the partial stator body clamps (6); The two partial stator bodies (2) are symmetrically arranged on both sides of the motor rotor (1); The winding blocking ring (4) is arranged at both ends of the motor rotor (1); and the rectangular wire (5) is wound on the partial stator body (2).

9. The system of claim 8, wherein, The profile characteristics of the two partial stator bodies (2) are consistent with the shape of the motor to be measured, and each partial stator body (2) contains at least one slot number corresponding to the pole pair number; The motor rotor (1) and the pair of drag motors are provided with a torque speed sensor therebetween; The rectangular wires (5) of the two symmetrically arranged partial stator bodies (2) are oppositely wound.

10. The system for separating and measuring AC copper loss and iron loss of an electric machine according to claim 8, wherein, The partial stator bodies (2) are wound with N wires and 2N wires in each slot respectively to form N wire motors and 2N wire motors; during winding, the two stator bodies are oppositely wound, and the shape of the winding conductor is such that the N wire motor and the 2N wire motor are equal in width, the N wire winding conductor is twice as high as the 2N wire winding conductor, and the total copper cross section of the conductors in each slot is equal; The 2N wire winding is two-wire parallel winding on the connecting wire, that is, the current of the N wire motor single wire and the 2N wire motor double wire is consistent, and the average current density is consistent.

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