Test method for mechanical characteristics of double-branch AC permanent-magnet motor

Abstract

The invention discloses a test method for mechanical characteristics of a double-branch AC permanent-magnet motor. The method comprises the following steps that: a power generation branch is connectedto an adjustable impedance load; and an electric branch is connected to a motor control driver; the control driver works, the load is adjusted to be a pure impedance one, the rotating speed of a motor, current waveform and phase voltage values of the electric branch, current waveform and phase voltage values of the power generation branch, and a power factor angle are tested; the motor stops running, the load of a generator unit is disconnected, and the resistance of a winding is calculated; an inductance value of an AC-DC axis of the motor is tested; a mutual inductance value between windings of the electric branch and the power generation branch is tested; a no-load counter-electromotive force of the motor is tested and a total flux phi0 of each pole of a permanent magnet is calculated;the motor starts to work again to obtain iron losses of the motor; an output torque of the motor is calculated; and the resistance value and inductance value of the load connected to the generator unit terminal are changed and the steps are repeated to obtain a mechanical characteristic curve. Therefore, no external device is required; and the common need of mechanical characteristic testing of the permanent magnet synchronous motor is met. Moreover, the device has a simple structure; the performances are stable; and data are reliable.

Description

technical field [0001] The invention relates to a method for testing mechanical characteristics, in particular to a method for testing the mechanical characteristics of a double-branch AC permanent magnet motor. The invention belongs to the technical field of motor testing. Background technique [0002] At present, the test methods for the mechanical characteristics of permanent magnet synchronous motors are relatively mature, most of which are direct test methods, that is, the motor is installed on the test bench, the motor itself runs electrically, and a dynamometer is added as a mechanical load at the same time, and then tested at different speeds. The output torque of the motor is used to complete the test of the mechanical characteristics of the motor. [0003] However, when using this method to test the mechanical characteristics of the permanent magnet motor, it is necessary to add a dynamometer or a mechanical load device, which virtually increases the equipment cond...

AI Technical Summary

Problems solved by technology

[0003] However, when using this method to test the mechanical characteristics of the permanent magnet motor, it is necessary to add a dynamometer or a mechanical load device, which virtually increases the equipment conditions required for the test.

Moreover, the high-power low-speed permanent magnet synchronous motor runs at a low speed, generally not exceeding 200rpm, and its torque is very large, so a large-capacity DC motor and its auxiliary equipment are required as loads, which are not available in some laboratories or research institutes. Hundreds of kilowatts or even megawatts of DC motor load test conditions, so this kind of test cannot be completed

Images