CN-117321430-B - Motor peak performance testing method and device

CN117321430BCN 117321430 BCN117321430 BCN 117321430BCN-117321430-B

Abstract

The invention provides a method and a device for testing peak performance of a motor, wherein the method comprises a setting testing step for setting maximum allowable power supply current of the motor and testing the peak performance of the motor by using the set maximum allowable power supply current, an adjusting step for adjusting the set maximum allowable power supply current to be reduced along with the rising of the rotating speed of the motor when the rotating speed of the motor reaches a preset rotating speed during testing the performance of the motor according to the set maximum allowable power supply current, and a continuous testing step for continuously testing the peak performance of the motor by using the adjusted maximum allowable power supply current. Thus, the highest copper loss density can be kept substantially constant with an increase in the motor rotation speed.

Inventors

GONG YU
LI JIAHAO
HU LIANG

Assignees

舍弗勒技术股份两合公司

Dates

Publication Date: 20260508
Application Date: 20210510

Claims (16)

1. The motor peak performance testing method is applied to a flat wire motor of a new energy automobile and is characterized by comprising the following steps of: a setting testing step, which is used for setting the maximum allowable power supply current of the motor and testing the peak performance of the motor by using the set maximum allowable power supply current; an adjustment step of adjusting the set maximum allowable power supply current to decrease with an increase in the rotational speed of the motor when the rotational speed of the motor reaches a predetermined rotational speed during a period in which the performance of the motor is tested in accordance with the set maximum allowable power supply current, and And continuing the testing step, namely continuing to test the peak performance of the motor by using the adjusted maximum allowable power supply current.
2. The method of claim 1, wherein, in the adjusting step, Calculating the ratio of the height of a conductor in a stator slot of the motor to the skin depth; Calculating a target maximum allowable supply current based on the ratio, the identity of the conductor, and the set maximum allowable supply current; And adjusting the set maximum allowable power supply current to the calculated target maximum allowable power supply current, wherein the target maximum allowable power supply current is smaller than the set maximum allowable power supply current.
3. The motor peak performance testing method according to claim 2, wherein in the adjusting step, the target maximum allowable supply current is calculated from the ratio, the identification of the conductor, and the set maximum allowable supply current using the following formula: Wherein I m represents the target maximum allowable supply current, I b represents the set maximum allowable supply current, ζ represents the ratio of the height of the conductor to the skin depth, and N represents the identity of the conductor.
4. A motor peak performance testing method according to any one of claims 1 to 3, wherein said setting testing step includes: setting a maximum allowable power supply current of the motor and a maximum allowable power supply voltage of the motor; according to the set lead angle and current test step length, calculating electromagnetic torque and phase voltage of the motor corresponding to each rotating speed of the motor; And filtering electromagnetic torque and phase voltage corresponding to the rotating speed of which the phase voltage exceeds the maximum allowable power supply voltage.
5. The method of claim 4, wherein the adjusting step comprises: After filtering out electromagnetic torque and phase voltage corresponding to the rotation speed of the phase voltage exceeding the maximum allowable power supply voltage, when the rotation speed of the motor reaches a preset rotation speed, the set maximum allowable power supply current is reduced along with the rising of the rotation speed of the motor.
6. The method of claim 5, wherein the continuing step of testing comprises: generating a peak torque curve of the motor representing peak torque performance of the motor according to the maximum electromagnetic torque corresponding to each remaining rotational speed; And generating a peak power curve of the motor, which represents the peak power performance of the motor, according to the maximum power corresponding to each remaining rotating speed.
7. The motor peak performance testing method according to claim 4, wherein said setting testing step includes: And setting the maximum allowable power supply voltage and the maximum allowable power supply current of the motor according to the current and voltage capacity of the battery and the power control unit PEU of the new energy automobile.
8. The motor peak performance testing method according to claim 4, wherein calculating a phase voltage for each rotation speed of the motor includes: acquiring a D-axis output voltage and a Q-axis output voltage of the motor under a rotating coordinate system corresponding to each rotating speed; And calculating the phase voltage corresponding to each rotating speed according to the obtained D-axis output voltage and Q-axis output voltage corresponding to each rotating speed.
9. The utility model provides a motor peak value performance testing arrangement, is applied to new energy automobile's flat wire motor, its characterized in that includes: the testing module is used for setting the maximum allowable power supply current of the motor and testing the peak performance of the motor by using the set maximum allowable power supply current; an adjustment module connected with the setting test module for adjusting the maximum allowable power supply current to be reduced along with the rising of the rotating speed of the motor when the rotating speed of the motor reaches a preset rotating speed during the test of the performance of the motor according to the maximum allowable power supply current, and And the continuous testing module is connected with the adjusting module and is used for continuously testing the peak performance of the motor by using the adjusted maximum allowable power supply current.
10. The motor peak performance testing apparatus according to claim 9, wherein the adjustment module is configured to: calculating the ratio of the height of a conductor in a stator slot of the motor to the skin depth; Calculating a target maximum allowable supply current based on the ratio, the identity of the conductor, and the set maximum allowable supply current; And adjusting the set maximum allowable power supply current to the calculated target maximum allowable power supply current, wherein the target maximum allowable power supply current is smaller than the set maximum allowable power supply current.
11. The peak motor performance testing apparatus according to claim 10, wherein the adjustment module is configured to calculate the target maximum allowable supply current using the following formula based on the ratio, the identification of the conductor, and the set maximum allowable supply current: Wherein I m represents the target maximum allowable supply current, I b represents the set maximum allowable supply current, ζ represents the ratio of the height of the conductor to the skin depth, and N represents the identity of the conductor.
12. The motor peak performance testing apparatus according to any one of claims 9 to 11, wherein the setup testing module is configured to: setting a maximum allowable power supply current of the motor and a maximum allowable power supply voltage of the motor; according to the set lead angle and current test step length, calculating electromagnetic torque and phase voltage of the motor corresponding to each rotating speed of the motor; And filtering electromagnetic torque and phase voltage corresponding to the rotating speed of which the phase voltage exceeds the maximum allowable power supply voltage.
13. The motor peak performance testing apparatus according to claim 12, wherein the adjustment module is configured to: After filtering out electromagnetic torque and phase voltage corresponding to the rotation speed of the phase voltage exceeding the maximum allowable power supply voltage, when the rotation speed of the motor reaches a preset rotation speed, the set maximum allowable power supply current is reduced along with the rising of the rotation speed of the motor.
14. The motor peak performance testing apparatus according to claim 13, wherein the continuation testing module is configured to: generating a peak torque curve of the motor representing peak torque performance of the motor according to the maximum electromagnetic torque corresponding to each remaining rotational speed; And generating a peak power curve of the motor, which represents the peak power performance of the motor, according to the maximum power corresponding to each remaining rotating speed.
15. The motor peak performance testing apparatus according to claim 12, wherein the setup test module is configured to: And setting the maximum allowable power supply voltage and the maximum allowable power supply current of the motor according to the current and voltage capacity of the battery and the power control unit PEU of the new energy automobile.
16. The motor peak performance testing apparatus according to claim 12, wherein the setup test module is configured to: acquiring a D-axis output voltage and a Q-axis output voltage of the motor under a rotating coordinate system corresponding to each rotating speed; And calculating the phase voltage corresponding to each rotating speed according to the obtained D-axis output voltage and Q-axis output voltage corresponding to each rotating speed.

Description

Motor peak performance testing method and device Technical Field The invention relates to the technical field of motors, in particular to a motor peak performance testing method and device. Background In the related art, in some situations, for example, in situations where a user needs to know the performance of a motor in order to select an appropriate motor whose performance meets the requirements, the performance of the motor needs to be tested before the motor leaves the factory. Existing motor performance testing methods may only consider voltage and current limitations, however, the requirements of new energy electric vehicles for peak performance often also include sufficient duration (10-30 seconds) at each rotational speed over the allowed temperature rise range (depending on the insulation level of the windings). Currently, most of these motors use rectangular flat wires due to high slot fill and good quality control. However, since rectangular flat wires have a strong skin effect at high speeds, the current density of the conductors in the stator slots is severely non-uniform, which results in a higher temperature rise of the motor at high speeds, which may not be considered by conventional peak performance estimation methods. Disclosure of Invention In view of the above, the present invention provides a method and apparatus for testing peak performance of a motor. In order to solve the technical problem, according to one embodiment of the invention, a motor peak performance testing method is provided, and the method is applied to a flat wire motor of a new energy automobile, and comprises a setting testing step, an adjusting step and a continuing testing step, wherein the setting testing step is used for setting the maximum allowable power supply current of the motor and testing the peak performance of the motor by using the set maximum allowable power supply current, the adjusting step is used for adjusting the set maximum allowable power supply current to be reduced along with the rising of the rotating speed of the motor when the rotating speed of the motor reaches a preset rotating speed during the testing of the performance of the motor according to the set maximum allowable power supply current, and the continuing testing step is used for continuing testing the peak performance of the motor by using the adjusted maximum allowable power supply current. In order to solve the technical problem, according to another embodiment of the invention, a peak performance testing device of a motor is provided, which is applied to a flat wire motor of a new energy automobile and comprises a setting testing module, an adjusting module and a continuous testing module, wherein the setting testing module is used for setting the maximum allowable power supply current of the motor and testing the peak performance of the motor by using the set maximum allowable power supply current, the adjusting module is connected with the setting testing module and is used for adjusting the set maximum allowable power supply current to be reduced along with the rising of the rotating speed of the motor when the rotating speed of the motor reaches a preset rotating speed during the testing of the performance of the motor according to the set maximum allowable power supply current, and the continuous testing module is connected with the adjusting module and is used for continuously testing the peak performance of the motor by using the adjusted maximum allowable power supply current. According to the method and the device for testing the peak performance of the motor, the set maximum allowable power supply current is used for testing the peak performance of the motor, if the rotating speed of the motor reaches the preset rotating speed in the period, the set maximum allowable power supply current is reduced along with the rising of the rotating speed of the motor, and the peak performance of the motor is continuously tested by using the adjusted maximum allowable power supply current. Thus, in comparison with the prior art in which only current limitation and/or voltage limitation are considered but no skin effect is considered in testing peak performance of the motor, the present invention considers not only current limitation but also skin effect in testing peak performance of the motor, whereby the maximum copper loss density can be kept substantially constant with an increase in the motor rotation speed by reducing the maximum allowable supply current applied to the motor when the motor rotation speed reaches a predetermined rotation speed. Other features and aspects of the present invention will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings. Drawings The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features and aspects of the invention and togeth