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

Abstract

The invention discloses an even unit alternating-current permanent magnet motor torque ripple testing method, and belongs to the technical field of motor testing. In order to solve the problem that at present, when the torque ripples of a multi-phase even unit permanent magnet synchronous motor are tested through a direct measuring method, a load device needs to be additionally arranged, by means of the structural characteristics of windings of even units of the multi-phase even unit permanent magnet synchronous motor, when the torque ripples of the motor are tested, part of the units of the motor can run in an electric mode to serve as an input power end, and part of the units of the motor can run in an electricity generation mode to serve as an output power end, and therefore running of all the units of the motor is ensured under the condition of simulating motor loads. By testing the torque ripples and related motor parameters under this condition, the curve of the torque ripples under a certain load condition is tested equivalently; by changing the load resistance of the power generation units of the motor, the torque ripples of the motor under any output power condition can be tested equivalently; thus, the additional load device is omitted while the torque ripples of the motor are tested equivalently.

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 even-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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