Test method for torque fluctuation of AC permanent magnet motor with odd number of units

Abstract

The invention discloses a torque fluctuation test method of an odd-numbered AC permanent magnet motor, which belongs to the technical field of motor testing. In order to solve the problem that an external load device is required when using the direct measurement method to test the torque fluctuation of the multi-phase odd-numbered permanent magnet synchronous motor, the present invention uses the winding structure characteristics of the odd-numbered unit of the multi-phase odd-numbered permanent magnet synchronous motor to test the rotation of the motor. When the torque fluctuates, some unit motors can be used as the input power end, and some unit motors can be used as the output power end, so as to ensure the operation of all units of the motor under the condition of simulating the motor load. By testing the torque fluctuation in this state and related motor parameters, the torque fluctuation curve under a certain load state can be equivalently tested, and the torque fluctuation curve under any output power state of the motor can be equivalently tested by changing the load resistance of the motor of the power generation unit. Torque fluctuation, so that the torque fluctuation of the motor is equivalently tested and the additional load device is omitted.

Description

technical field [0001] The invention belongs to the technical field of motor testing, and relates to a testing method for torque fluctuation of a multi-phase odd-numbered unit permanent magnet synchronous motor. Background technique [0002] At present, the dynamic test methods for torque fluctuation of permanent magnet synchronous motors are mainly divided into direct measurement methods and indirect measurement methods. Among them, the direct measurement method can relatively accurately test the torque fluctuation of the motor, while the indirect measurement method needs to rely on the calculation speed of the processor and the accuracy of its indirect test parameters, which virtually increases the test error. However, there are also some problems in the torque ripple test for high-power motors. In general, testing the torque of a motor requires an external dynamometer or a mechanical load device as a load, which increases the equipment conditions required for the test. ...

AI Technical Summary

Problems solved by technology

For the high-power low-speed permanent magnet synchronous motor, which operates at a low speed (generally no more than 200rpm) and has a large torque to be tested, a large-capacity DC motor and its auxiliary equipment are required as loads. Some laboratories or The research institute simply does not have the test conditions for hundreds of kilowatts or even megawatts of DC motor loads, so this kind of test cannot be completed

And after the load is added, the test device will be changed from the motor and the torque sensor in series to the motor, the load and the torque sensor in series, which increases the axial length and affects the test accuracy of the torque fluctuation

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