Temperature rise test method for multiphase multi-unit permanent magnet motor

Abstract

The invention belongs to the technical field of motor testing, discloses a temperature rise test method for a multiphase multi-unit permanent magnet motor and aims to solve the problems of energy consumption in long-time operation of the motor and request of additional testing equipment in a current temperature rise testing process for a permanent magnetic synchronous motor. The method includes the steps: enabling one unit of the tested motor to be in power generation operation; enabling another unit of the tested motor to be in electric operation; measuring a power angle, a phase resistance voltage value and a current waveform of a three-phase winding; taking all units as electric units to access to a circuit, controlling a direct-axis voltage and a quadrature-axis voltage applied to the winding to enable direct-axis and quadrature-axis currents of the winding to meet test constraint conditions, and measuring a current temperature rise curve of the motor; changing a load connected to a power generation unit end to obtain temperature rise curves of the multi-unit motor under the conditions of different rotation speeds and different loads. Current parameters and output power of the motor under a loaded condition are obtained by enabling one unit of the motor to be in electric operation and another unit of the motor to be in power generation operation.

Description

technical field [0001] The invention relates to a method for testing the temperature rise of a multi-phase multi-unit 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 d...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for testing the temperature rise of a multi-phase multi-unit 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

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