Method for testing temperature rise of three-phase alternating-current permanent magnet motor

Abstract

The invention discloses a method for testing temperature rise of a three-phase alternating current permanent magnet motor, which belongs to the technical field of motor test, and aims at solving the problems that external test equipment is needed and energy of the motor is consumed during long-term operation when temperature rise of a permanent magnet synchronous motor is tested at present. The method comprises the following steps: reading nameplate information of a tested motor, and recording numerical values of power, current and rotating speed of the motor during rated operating; adjusting a driving controller, and controlling the direct-axis voltage and quadrature-axis voltage applied to the winding so as to maintain the rotating speed of the motor at the rotating speed in the step 3; and testing the three-phase winding current, obtaining the current Iq2 and Id2 of the dq axis by virtue of dq conversion, measuring the temperature rise of the motor, thereby obtaining a temperature rise curve of the motor. The method disclosed by the invention has the advantages that the dq axis current is regulated by virtue of the driving controller, so that the motor is positioned in a non-load state, and the temperature rise condition of the motor in a load state is simulated in the state. According to the method, an extra mechanical loading device is not needed, and energy consumption caused by mechanical load in the testing process is avoided.

Description

technical field [0001] The invention relates to a method for testing the temperature rise of a three-phase AC permanent magnet motor, belonging to the technical field of motor testing. Background technique [0002] At present, there are mainly three methods for testing the temperature rise of permanent magnet synchronous motors: thermometer method, resistance method and temperature detector method. The thermometer method generally tests the surface temperature of the motor, the resistance method tests the average temperature of the winding, and the thermometer method tests the internal temperature of the motor by embedding a temperature measuring element inside the motor. [0003] However, these three temperature rise test methods all need to make the motor work under load for a long time, so that the temperature rise of the motor reaches a stable state to complete the temperature rise test. This requires that the motor needs to be connected to an external load device durin...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for testing the temperature rise of a three-phase AC permanent magnet motor, which is to solve the problem that when testing the temperature rise of a permanent magnet synchronous motor, additional testing equipment is required and the motor consumes energy for a long time