Test method for loss of double-branch alternating-current permanent-magnet motor

Abstract

The invention discloses a test method for loss of a double-branch alternating-current permanent-magnet motor, comprising steps of connecting an electricity generating branch to an adjustable resistor-inductance load, and connecting an electric branch to a motor control driver, running the control driver, wherein the load is pure resistant, testing a rotation speed of the motor, a current waveformand a phase voltage value of the electric branch, and a current waveform and a phase voltage value and a power factor angle of the electricity generating branch; stopping running of the motor, disconnecting a generator unit load, calculating a winding resistance; testing a quadrature-direct axis inductance of the motor, testing a back electromotive force of the motor under no load and solving a total magnetic flux Phi 0 of each pole of a permanent magnet; running the motor again to obtain iron loss of the motor. Compared to a direct test method for loss, the method of the invention does not require an external mechanical load device, so as to save test cost. Compared with an indirect test method for loss, the method of the invention does not need to use an iron loss tester, so as to avoidcomplicated calculation and adjustment of instrument parameters, and considers the influence of rolling process on the 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

Images