Performance prediction method and system after motor expansion on same platform

Abstract

The invention provides a performance prediction method and system after motor expansion on the same platform, and belongs to the technical field of motor expansion performance prediction, and the method comprises the steps: obtaining the no-load loss-rotating speed test data of a motor before stack height expansion, the stack height of the motor before expansion and the stack height of the motor after expansion, and obtaining the wind friction loss of the motor after expansion; performing simulation according to a motor no-load loss test result to obtain mechanical loss of the motor, and obtaining mechanical loss of the expanded motor based on the weight of the rotor before stacking expansion, the weight of the rotor after stacking expansion and the mechanical loss of the motor; based on the fact that the direct current copper loss of the motor before expansion is a function of the rotating speed and the torque, the total copper loss of the motor before expansion is determined, and the copper loss of the motor after expansion is obtained based on the direct current resistance of the motor before expansion, the total copper loss of the motor before expansion and the direct current resistance after expansion and stacking; and obtaining the output power and the input power of each measuring point, and calculating the efficiency of each measuring point by using the output power / input power of each measuring point, namely the efficiency of the expanded motor.

Description

Technical Field

[0001] The present invention belongs to the technical field of motor expansion performance prediction, and in particular, relates to a method and system for predicting the performance of a motor after expansion on the same platform. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Motors play an extremely important role in people's daily life and production. Flat wire motors are widely used in different application scenarios due to their high slot fill rate and high power density.

[0004] The same platform expansion means: keeping the stator and rotor blades of the motor different, and realizing the deformation of motors with different power and torque by adjusting the material, stacking height and winding parameters.

[0005] Flat wire motors have a complex stator trial production process and poor production line flexibility. When expanding on the same platform, it is necessary to ensure that the stator and rotor sheet shapes remain unchanged and expand the stacking height. Therefore, it is important to accurately predict the performance of the motor after expansion. The stacking height refers to the stacking height of the stator and rotor cores, that is, the stacking length of the cores.

[0006] At present, there are some studies on the performance analysis of the winding arrangement of flat wire motors, but the performance of motors on the same platform after different stacking height expansions is of great benefit to improving the optimization efficiency and degree of motor optimization. Generally speaking, when the same type of motor is changed to different stacking heights, it is necessary to predict in advance whether the performance indicators of the motor after the change meet the requirements. The indicators of the motor include many, such as power, economy, cost, NVH, and temperature rise. The different performance of the motor can be achieved by changing the stacking height, material grade, winding parameters, etc., which can reduce the number of motor molds, etc., and reduce production costs. However, in the prior art, the prediction of the performance of motors on the same platform after different stacking height expansions is mainly based on subjective judgment or simple indicators, which is not objective enough and has large errors. Summary of the invention

[0007] In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides a method for predicting the performance of motors on the same platform after expansion, and provides technical support for the design of motors with differentiated advantages by calculating the external characteristics and efficiency of the motors expanded on the same platform.

[0008] To achieve the above objectives, one or more embodiments of the present invention provide the following technical solutions: First, a method for predicting the performance of motors after expansion on the same platform is disclosed, including: Obtain the no-load loss-speed test data of the motor before stacking height expansion, the stacking height of the motor before expansion and the stacking height of the motor after expansion, and obtain the wind friction loss of the motor after expansion; According to the no-load loss test results of the motor, the no-load iron loss simulation is performed to obtain the mechanical loss of the motor. Then, based on the rotor weight before stacking and expansion, the rotor weight after stacking and expansion, and the mechanical loss of the motor, the mechanical loss of the motor after expansion is obtained. Based on the fact that the DC copper loss of the motor before expansion is a function of the speed and torque, the total copper loss of the motor before expansion is obtained, and the copper loss of the motor after expansion is obtained based on the DC resistance of the motor before expansion, the total copper loss of the motor before expansion, and the DC resistance after expansion stacking; Using electromagnetic simulation, calculate the external characteristics of the expanded motor: take the basic iron loss and DC copper loss of all speed and torque points, the wind friction loss, mechanical loss, copper loss, and iron loss of the corresponding measurement points; Obtain the output power and input power of each measuring point. The input power is the sum of output power, iron loss, copper loss, mechanical loss, and wind friction loss. The efficiency of each measuring point is calculated using the output power / input power of each measuring point to obtain the efficiency of the motor after expansion.

[0009] As a further technical solution, the calculation process of the expanded motor wind friction loss is: Fit the no-load loss P0-speed test data of the motor before stacking and expansion, and extract the value P1 of the no-load loss changing with the third-order term of speed; The stack height of the motor before expansion is obtained as L1, and the stack height of the motor after expansion is obtained as L2; Calculate the motor wind friction loss after expansion .

[0010] As a further technical solution, the process of obtaining the mechanical loss of the expanded motor is: According to the no-load loss test results of the motor, the no-load iron loss simulation is performed to obtain P3; The mechanical loss of the motor is P4=P0-P1-P3; Obtain the rotor weight m1 before stacking height expansion and the rotor weight m2 after stacking height expansion; Calculate the mechanical losses of the motor after expansion .

[0011] As a further technical solution, the process of obtaining the copper loss of the expanded motor is: The DC resistance of the motor before expansion is R1, and the DC resistance after expansion and stacking is R2; Test the AC / DC resistance ratio of the motor before expansion, AC frequency , where p is the number of pole pairs, n is the speed, and R3 is the AC / DC resistance ratio of the motor, specifically the ratio of the total resistance to the DC resistance; For any working condition, the current of the motor before expansion is I i， Related to speed and torque, DC copper loss P6=Ii 2 R1, the total copper loss of the motor before expansion is ; Calculate the copper loss of the motor after expansion .

[0012] As a further technical solution, the process of obtaining the iron loss coefficient of the expanded motor is also included: The actual iron loss of the motor is calculated by using the efficiency MAP total loss, wind friction loss, mechanical loss, copper loss, and efficiency of the motor's performance calibration before expansion; Use electromagnetic simulation to calculate the basic iron loss; The iron loss coefficient K of the motor = actual iron loss / basic iron loss; The iron loss coefficient of the motor after expansion is consistent with that before expansion.

[0013] As a further technical solution, when analyzing the external characteristics of the expanded motor, the expanded motor uses electromagnetic simulation to predict the peak torque of the motor in the constant torque section; The corresponding relationship between the external characteristics of the motor in the weak magnetic field speed expansion section before expansion is based on the difference between the inductance parameters of the simulated motor and the actual motor. The voltage utilization rate of the motor is adjusted. The specific adjustment process is as follows: The torque under the same current and the same speed is extracted, and the torque in the weak magnetic expansion section of the measured motor is compared. When the absolute value of the torque difference is the smallest, the voltage utilization rate of the motor is x. After expansion, the voltage utilization rate of the motor is set to x.

[0014] Secondly, the motor performance prediction system after expansion on the same platform is disclosed, including: The module for obtaining the wind friction loss of the motor after the expansion is configured to: obtain the no-load loss-speed test data of the motor before the stacking height expansion, the stacking height of the motor before the expansion and the stacking height of the motor after the expansion, and obtain the wind friction loss of the motor after the expansion; The mechanical loss acquisition module of the motor after expansion is configured to: perform no-load iron loss simulation according to the no-load loss test result of the motor to obtain the mechanical loss of the motor, and then obtain the mechanical loss of the motor after expansion based on the rotor weight before stacking and expansion, the rotor weight after stacking and expansion, and the mechanical loss of the motor; The copper consumption acquisition module of the motor after expansion is configured as follows: based on the DC copper consumption of the motor before expansion being a function of the speed and torque, the total copper consumption of the motor before expansion is obtained, and the copper consumption of the motor after expansion is obtained based on the DC resistance of the motor before expansion, the total copper consumption of the motor before expansion, and the DC resistance after expansion stacking; The efficiency calculation module of the extended motor is configured as follows: using electromagnetic simulation, calculate the external characteristics of the extended motor: taking the basic iron loss and DC copper loss of all speed and torque points, the wind friction loss, mechanical loss, copper loss, and iron loss of the corresponding measurement points; Obtain the output power and input power of each measuring point. The input power is the sum of output power, iron loss, copper loss, mechanical loss, and wind friction loss. The efficiency of each measuring point is calculated using the output power / input power of each measuring point to obtain the efficiency of the motor after expansion.

[0015] One or more of the above technical solutions have the following beneficial effects: The technical solution of the present invention utilizes the measured data of the motor before the change to reversely infer and calibrate the simulation model of the motor, and then uses the simulation model to predict the motor after the change. Based on the measured data of the motor before expansion, various losses are reasonably analyzed and output, and the voltage utilization rate is used to analyze the influence of parameters such as the inductance of the actual motor and the simulated motor, and corresponding adjustments are made.

[0016] The technical solution of the present invention utilizes the measured data of the motor before the change to reversely infer and calibrate the simulation model of the motor, and then utilizes the simulation model to predict the performance indicators of the motor after the change. The characteristics of the external characteristic curve of the permanent magnet synchronous motor can be checked. The front section is called the constant torque section, and the back section is called the constant power section. Due to the existence of weak magnetic field, the dynamics and efficiency of this section are difficult to predict. Therefore, with the existence of the measured results of the motor before the change, a more accurate prediction and analysis of the external characteristics of the constant power section can be made.

[0017] The technical solution of the present invention is a method for calculating the external characteristics and efficiency of a motor expanded on the same platform, providing technical support for the design of motors with differentiated advantages.

[0018] Advantages of additional aspects of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0020] Figure 1 A flow chart of a method for calculating the external characteristics and efficiency of a motor provided by an embodiment of the present invention on the same platform; Figure 2 , which is a schematic diagram of simulation results provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0021] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0022] It should be noted that the terms used herein are for describing specific embodiments only and are not intended to be limiting of exemplary embodiments according to the present invention.

[0023] In the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0024] Embodiment 1 See attached Figure 1 As shown, this embodiment discloses a method for predicting the performance of a motor after expansion on the same platform, which specifically includes: S1: Before the stacking height is expanded, the motor bench test is performed to obtain the test data corresponding to the motor's no-load loss and speed. P0 is the motor's no-load loss, unit kW. The test data is fitted to extract the value P1 that changes with the third-order term of the speed. P1 is the motor's wind friction loss before expansion. The stacking height of the motor before expansion is L1, and the stacking height of the motor after expansion is L2. According to common sense, increasing the stacking height will lead to an increase in the core volume, thereby increasing the magnetic resistance and eddy current loss. The wind friction loss is linearly related to the stacking height, that is, P1=μL1, μ=P1 / L1, and μ refers to the ratio of the linear relationship; changing the stacking height to L2, that is, the motor wind friction loss after expansion is P2=μL2. After substituting μ=P1 / L1, the motor wind friction loss after expansion is calculated based on this. .

[0025] In this implementation example, polynomial fitting is performed using Matlab to distinguish losses of different orders, which represent different types of losses. No-load loss includes mechanical loss of bearings, wind friction loss of rotors and iron loss of cores, and iron loss of cores includes hysteresis loss and eddy current loss. Among these losses, only wind friction loss is tertiary, so it is necessary to deal with wind friction loss first, and then continue to disassemble other losses.

[0026] In this implementation example, the actual measurement results of the motor with a stack height of L1 are used to determine the performance of the motor after expansion to a stack height of L2 to determine whether it meets the requirements. Based on the expansion formula of wind friction loss at different stack heights, the wind friction loss of the motor after expansion is predicted.

[0027] S2: According to the no-load loss test results of the motor, the no-load iron loss simulation is performed. During the simulation, the temperature is set to 25°C, the current is 0.001A, and the current advance angle is 45°. The iron loss P3 can be directly obtained by the software. The no-load iron loss at different speeds is obtained through simulation. The mechanical loss of the motor is P4=P0-P1-P3, which is the mechanical loss of the bearing corresponding to the no-load loss of the motor; before the stacking height expansion, the rotor weight is m1, and after the stacking height expansion, the rotor weight is m2. According to common knowledge, the mechanical loss is linearly related to the rotor weight. Based on this, the mechanical loss of the motor after expansion is calculated. .

[0028] Based on the influence of the radial force of the bearing on the bearing loss, this example can more accurately calculate the mechanical loss of the bearing of the motor after it is expanded to a stack height of L2.

[0029] S3: The DC resistance of the motor before expansion is measured by a multimeter and is R1. The DC resistance is calculated as R2. The AC / DC resistance ratio and AC frequency of the motor before expansion are tested. , where p is the number of pole pairs and n is the motor speed in rpm. The AC / DC resistance ratio of the motor is the measured relationship. The DC copper loss P6 of the motor before expansion is related to the speed and torque. The total copper loss of the motor before expansion is , R3 is the AC / DC resistance ratio of the motor, specifically the ratio of the total resistance to the DC resistance; according to common knowledge, the copper loss of the motor is linearly related to the DC resistance, and the total copper loss of the expanded motor is calculated based on this. , based on the total loss of the motor before expansion, calculate the total copper loss of the motor after expansion, including DC copper loss and AC copper loss.

[0030] Regarding the function of speed and torque, the motor has different current intensities at different speeds and torques due to the existence of control strategies, and the Joule heat caused by the current is also different. P6 represents the DC copper loss of the motor before expansion. The current distribution of the motor at different speeds and torques is also called current MAP.

[0031] It should be noted that the AC / DC resistance ratio = total resistance / DC resistance. When the frequency of the current flowing through the conductor changes, the resistance will change. By measuring the DC resistance, you can also use an LCR meter to test the AC resistance of the motor at different frequencies, and you can directly calculate the AC / DC resistance ratio.

[0032] S4: The actual iron loss of the motor can be calculated using the efficiency MAP (contour map, contour map) of the performance calibration of the motor before expansion, including total loss, wind friction loss, mechanical loss, copper loss, and efficiency (total loss - wind friction loss - mechanical loss - copper loss = actual iron loss). The basic iron loss can be calculated using electromagnetic simulation. The iron loss coefficient of the motor K = actual iron loss / basic iron loss. The iron loss coefficient of the motor remains unchanged after expansion. The iron loss coefficient is related to the processing and manufacturing of the motor. For the same product expansion, the general process will not change.

[0033] S5: External characteristics of the motor after expansion, constant torque section, the peak torque of the motor in the constant torque section is predicted by electromagnetic simulation after expansion. The corresponding relationship of nTI in the external characteristics of the motor before expansion, because there are certain differences between the parameters such as inductance of the simulated motor and the actual motor, the voltage utilization needs to be adjusted: adjust the voltage utilization of the motor, extract the torque at the same current and the same speed, and the torque of the measured motor in the weak magnetic expansion section, when the absolute value of the torque difference is the smallest, the voltage utilization of the motor before expansion is x, and the voltage utilization of the motor after expansion is set to x, based on the voltage utilization, electromagnetic simulation is used to calculate the external characteristics of the motor after expansion.

[0034] The simulation process here is a simulation technology commonly used in Motor-cad software, which belongs to the prior art and will not be described in detail here.

[0035] Among them, nTI is the current corresponding to the motor at different speeds and torques, which is related to the motor parameters and control strategy. It is generally obtained by test engineers through testing in motor bench tests.

[0036] The voltage utilization is the actual line voltage of the motor (expressed in amplitude) / rated voltage.

[0037] S6: From small to high speed, take the intervals n1-nm in turn, and from small to high torque, take T1-Tt, and take the basic iron loss P9 of all speed and torque points respectively. The basic iron loss is obtained through simulation, and the wind friction loss of the corresponding measuring point is obtained by the formula Calculate the mechanical loss by the formula , the total copper loss is calculated by the formula Calculate the iron loss by the formula Calculation, K is the iron loss coefficient of the motor, and the output power P11 of each measuring point (n, T) is , the unit is kilowatt, the input power P12=P11+P10+P8+P5+P2, use P11 / P12 to calculate the efficiency MAP of the motor. At different points, the efficiency of the motor is different. The above result is the efficiency of the motor after expansion.

[0038] See attached Figure 2 As shown, the electromagnetic simulation of this embodiment example is performed using the Motor-cad software of Ansys, and the simulation process includes: Based on Motor-cad, fill in the stator outer diameter, stator inner diameter, air gap, number of slots, number of poles, slot depth and slot width, length and width of permanent magnets, angle of permanent magnets, pole arc coefficient of permanent magnets, and stack height in the geometric parameter setting module; fill in the number of phases, number of turns, number of parallel branches, number of parallel windings, pitch and wire diameter in the winding parameter setting module; assign the stator core and rotor core to silicon steel material, the winding to pure copper, and the permanent magnet to rare earth permanent magnet in the material selection module; set the winding temperature and permanent magnet temperature in the solution setting module; after clicking to build the model in the efficiency solution module, set the voltage and voltage utilization rate, and click to generate the efficiency map and data in the efficiency map calculation module. The generated data includes: speed, torque, efficiency, copper loss, iron loss, inductance, resistance, current, voltage and other information. This simulation process is a commonly used simulation technology in Motor-cad software, which belongs to the prior art and will not be described in detail here.

[0039] The simulation acquisition process of the above motor efficiency MAP is to calculate the different losses at different points in turn, and then calculate the different efficiencies, and finally form the efficiency MAP of the expanded motor to determine whether the expanded requirements meet the development requirements.

[0040] in, Figure 2 The horizontal axis in the figure is the speed, and the vertical axis on the left is the torque. After simulation, the efficiency MAP diagram is obtained, and different colors represent different efficiencies on the right.

[0041] Embodiment 2 The purpose of this embodiment is to provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above method when executing the program.

[0042] Embodiment 3 The purpose of this embodiment is to provide a computer-readable storage medium.

[0043] A computer-readable storage medium stores a computer program, which executes the steps of the above method when executed by a processor.

[0044] Embodiment 4 The purpose of this embodiment is to provide a motor performance prediction system after expansion on the same platform, including: The module for obtaining the wind friction loss of the motor after the expansion is configured to: obtain the no-load loss-speed test data of the motor before the stacking height expansion, the stacking height of the motor before the expansion and the stacking height of the motor after the expansion, and obtain the wind friction loss of the motor after the expansion; The mechanical loss acquisition module of the motor after expansion is configured to: perform no-load iron loss simulation according to the no-load loss test result of the motor to obtain the mechanical loss of the motor, and then obtain the mechanical loss of the motor after expansion based on the rotor weight before stacking and expansion, the rotor weight after stacking and expansion, and the mechanical loss of the motor; The copper consumption acquisition module of the motor after expansion is configured as follows: based on the DC copper consumption of the motor before expansion being a function of the speed and torque, the total copper consumption of the motor before expansion is obtained, and the copper consumption of the motor after expansion is obtained based on the DC resistance of the motor before expansion, the total copper consumption of the motor before expansion, and the DC resistance after expansion stacking; The efficiency calculation module of the extended motor is configured as follows: using electromagnetic simulation, calculate the external characteristics of the extended motor: taking the basic iron loss and DC copper loss of all speed and torque points, the wind friction loss, mechanical loss, copper loss, and iron loss of the corresponding measurement points; Obtain the output power and input power of each measuring point. The input power is the sum of output power, iron loss, copper loss, mechanical loss, and wind friction loss. The efficiency of each measuring point is calculated using the output power / input power of each measuring point to obtain the efficiency of the motor after expansion.

[0045] Embodiment 5 The purpose of this embodiment is to provide a computer program product containing instructions, which, when running on a computer, enables the computer to execute the methods and functions involved in any of the above embodiments. The steps involved in the apparatus of the above embodiment correspond to the method embodiment 1, and the specific implementation method can refer to the relevant description part of embodiment 1. The term "computer-readable storage medium" should be understood as a single medium or multiple media including one or more instruction sets; it should also be understood to include any medium that can store, encode or carry an instruction set for execution by a processor and enable the processor to execute any method in the present invention.

[0046] Those skilled in the art should understand that the modules or steps of the present invention described above can be implemented by a general-purpose computer device, or alternatively, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. The present invention is not limited to any specific combination of hardware and software.

[0047] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A method for predicting the performance of motors after expansion on the same platform, characterized in that: include: Obtain the no-load loss-speed test data of the motor before stacking height expansion, the stacking height of the motor before expansion and the stacking height of the motor after expansion, and obtain the wind friction loss of the motor after expansion; According to the no-load loss test results of the motor, the no-load iron loss simulation is performed to obtain the mechanical loss of the motor. Then, based on the rotor weight before stacking and expansion, the rotor weight after stacking and expansion, and the mechanical loss of the motor, the mechanical loss of the motor after expansion is obtained. Based on the fact that the DC copper loss of the motor before expansion is a function of the speed and torque, the total copper loss of the motor before expansion is obtained, and the copper loss of the motor after expansion is obtained based on the DC resistance of the motor before expansion, the total copper loss of the motor before expansion, and the DC resistance after expansion stacking; Using electromagnetic simulation, calculate the external characteristics of the expanded motor: take the basic iron loss and DC copper loss of all speed and torque points, the wind friction loss, mechanical loss, copper loss and iron loss of the corresponding measurement points; Obtain the output power and input power of each measuring point. The input power is the sum of output power, iron loss, copper loss, mechanical loss, and wind friction loss. The efficiency of each measuring point is calculated using the output power / input power of each measuring point as the efficiency of the expanded motor.

2. The method for predicting the performance of a motor after expansion on the same platform as claimed in claim 1, characterized in that: The calculation process of the expanded motor wind friction loss is: The no-load loss P0-speed test data of the motor before stacking and expansion is fitted, and the value P1 of the no-load loss changing with the third-order term of speed is extracted. P1 is the wind friction loss of the motor before expansion. The stack height of the motor before expansion is obtained as L1, and the stack height of the motor after expansion is obtained as L2; Calculate the motor wind friction loss after expansion .

3. The method for predicting the performance of a motor after expansion on the same platform as claimed in claim 2, characterized in that: The process of obtaining the mechanical loss of the expanded motor is: According to the no-load loss test results of the motor, the no-load iron loss simulation is performed to obtain the iron loss P3; The mechanical loss of the motor is P4=P0-P1-P3, P0 is the no-load loss, and P1 is the wind friction loss of the motor before expansion; Obtain the rotor weight m1 before stacking height expansion and the rotor weight m2 after stacking height expansion; Calculate the mechanical losses of the motor after expansion .

4. The method for predicting the performance of a motor after expansion on the same platform as claimed in claim 1, characterized in that: The process of obtaining the copper loss of the expanded motor is: The DC resistance of the motor before expansion is R1, and the DC resistance after expansion and stacking is R2; Test the AC / DC resistance ratio of the motor before expansion, AC frequency , where p is the number of pole pairs and n is the rotation speed; For any working condition, the current of the motor before expansion is I i Related to speed and torque, DC copper loss P6=I i 2 R1, the total copper loss of the motor before expansion is , R3 is the AC / DC resistance ratio of the motor, specifically the ratio of the total resistance to the DC resistance; Calculate the copper loss of the motor after expansion .

5. The method for predicting the performance of a motor after expansion on the same platform as claimed in claim 1, characterized in that: It also includes the process of obtaining the iron loss coefficient of the expanded motor: The actual iron loss of the motor is calculated by using the efficiency MAP total loss, wind friction loss, mechanical loss, copper loss, and efficiency of the motor's performance calibration before expansion; Calculate the basic iron loss using electromagnetic simulation; The iron loss coefficient K of the motor = actual iron loss / basic iron loss; The iron loss coefficient of the motor after expansion is consistent with that before expansion.

6. The method for predicting the performance of a motor after expansion on the same platform as claimed in claim 1, characterized in that: It also includes the analysis of the external characteristics of the expanded motor, and the use of electromagnetic simulation to predict the peak torque of the motor in the constant torque section of the expanded motor; The corresponding relationship between the external characteristics of the motor in the weak magnetic field speed expansion section before expansion is based on the difference between the inductance parameters of the simulated motor and the actual motor. The voltage utilization rate of the motor is adjusted. The specific adjustment process is as follows: The torque under the same current and the same speed is extracted, and the torque in the weak magnetic expansion section of the measured motor is compared. When the absolute value of the torque difference is the smallest, the voltage utilization rate of the motor is x. After expansion, the voltage utilization rate of the motor is set to x.

7. The motor performance prediction system after expansion on the same platform is characterized by: include: The motor wind friction loss acquisition module after expansion is configured to: acquire the no-load loss-speed test data of the motor before stacking height expansion, the stacking height of the motor before expansion and the stacking height of the motor after expansion, and obtain the motor wind friction loss after expansion; The mechanical loss acquisition module of the motor after expansion is configured to: perform no-load iron loss simulation according to the no-load loss test result of the motor to obtain the mechanical loss of the motor, and then obtain the mechanical loss of the motor after expansion based on the rotor weight before stacking and expansion, the rotor weight after stacking and expansion, and the mechanical loss of the motor; The copper consumption acquisition module of the motor after expansion is configured as follows: based on the DC copper consumption of the motor before expansion being a function of the speed and torque, the total copper consumption of the motor before expansion is obtained, and the copper consumption of the motor after expansion is obtained based on the DC resistance of the motor before expansion, the total copper consumption of the motor before expansion, and the DC resistance after expansion stacking; The efficiency calculation module of the extended motor is configured as follows: using electromagnetic simulation, calculate the external characteristics of the extended motor: taking the basic iron loss and DC copper loss of all speed and torque points, the wind friction loss, mechanical loss, copper loss, and iron loss of the corresponding measurement points; Obtain the output power and input power of each measuring point. The input power is the sum of output power, iron loss, copper loss, mechanical loss, and wind friction loss. The efficiency of each measuring point is calculated using the output power / input power of each measuring point to obtain the efficiency of the motor after expansion.

8. A computer program product, comprising a computer program, characterized in that When the computer program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the program, the steps of the method described in any one of claims 1 to 6 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method described in any one of claims 1 to 6 are performed.

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