Odd-number unit alternating current permanent magnet motor torque fluctuation testing method

Abstract

The invention provides an odd-number unit alternating current permanent magnet motor torque fluctuation testing method, belongs to the technical field of motor testing and aim at solving the problem that an additional load device is needed when torque fluctuation of a multiphase odd-number unit permanent magnet synchronous motor is tested by adopting a direct measurement method at present. The method can utilize a part of unit motor running electrically as an input power end when testing the motor torque fluctuation by utilizing a winding structure characteristic of an odd-number unit of the multiphase odd-number unit permanent magnet synchronous motor, the part of unit motor running in a generating mode serves as an output power end, and accordingly running of all of units of the motor is ensured under the condition that motor load is simulated. A torque fluctuation curve is equivalently tested in a certain load state by testing the torque fluctuation in the state and related motor parameters, the motor torque fluctuation can be equivalently tested in an any output power state by changing load resistance of a generating unit motor, accordingly the motor torque fluctuation is equivalently tested, and the additional load device is also 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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