Test Method for Loss of Double-Branch AC Permanent Magnet Motor

Abstract

The invention discloses a method for testing the loss of a double-branch AC permanent magnet motor, which comprises the steps of connecting an adjustable resistance-inductive load to a power generation branch, and connecting a motor control driver to an electric branch; controlling the operation of the driver, the load is purely resistive, and testing the rotational speed of the motor , Electric branch current waveform and phase voltage value, power generation branch current waveform and phase voltage value and power factor angle; the motor stops running, disconnect the generator unit load, and calculate the winding resistance; test the motor AC and direct axis inductance; test the motor empty Carry back EMF and solve to obtain the total magnetic flux Φ of each pole of the permanent magnet 0 ; Run the motor again to get the iron loss of the motor. Compared with the direct test method of loss, the present invention does not need an external mechanical load device, which saves test cost. Compared with the indirect test method of loss, this method does not need to use iron loss tester, avoids complicated calculation and adjustment of instrument parameters, and considers the influence of rolling process on loss test.

Description

technical field [0001] The invention relates to a method for testing the loss of a double-branch AC permanent magnet motor, which belongs to the technical field of motor testing. Background technique [0002] At present, the test methods for the core loss of permanent magnet synchronous motors can be divided into two types: direct test method and indirect test method. [0003] The general direct test method is to use the prime mover and the tested motor to drag, and use the tests under different loads to calculate the core loss of the motor. In the process of using the direct test method to test the loss characteristics of the motor, not only an external load device is required, which increases the complexity of the test; and due to the existence of the load, the energy consumption of the test system is also relatively high during the test process of loss and temperature rise. big. [0004] The general indirect test method is to use external equipment to test the loss of e...

AI Technical Summary

Problems solved by technology

[0006] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is to provide a method for testing the loss of a double-branch AC permanent magnet motor that can test the loss of the motor without a mechanical load device or without a mechanical load device

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