System and method thereof for testing endurance of symmetrical motor

Abstract

The invention discloses a system for testing endurance of a symmetrical motor. The system comprises two to-be-tested motors, two environment compartments, two cooling machine units, a torque sensor, two motor controllers, a coupling and a rectifying unit, wherein the two to-be-tested motors are respectively a three-phase alternating current motor, the temperatures of the interiors of the environment compartments are adjustable, the environment compartments are used for respectively accommodating the two to-be-tested motors, the two cooling machine units are used for respectively radiating the heat of windings of the two to-be-tested motors, the torque sensor is arranged on a rotary shaft of any to-be-tested motor, the first motor controller is used for controlling the current of the direct shaft and the rotation speed of the rotary shaft of the first to-be-tested motor, the second motor controller is used for controlling the current of the direct shaft and the quadrature axis current of the second to-be-tested motor, the rotary shafts of the two to-be-tested motors are connected by the coupling to ensure the uniform rotation speeds of the two rotary shafts, and the rectifying unit is used for converting the alternating current into the constant direct current, and then is used for respectively supplying power to the two motors. The invention also discloses a test method. The test system has the advantages that the structure is simple, the test efficiency is higher, and the universality is higher.

Description

technical field [0001] This application relates to a system for durability testing of motors of new energy vehicles (hybrid vehicles, pure electric vehicles, etc.). Background technique [0002] The drive motor is the core component of new energy vehicles, usually using a three-phase AC motor, preferably a permanent magnet synchronous motor. The service life and reliability of the motor are directly related to the life and safety of the vehicle. Therefore, in the development process of the drive motor of the new energy vehicle, it is essential to carry out the durability test. The durability test of the motor is based on the operation status of the motor in the actual road conditions, and the equivalent strengthening experiment is carried out to accelerate the aging of the motor. The equivalent strengthening experiment includes a durability experiment in which the motor operates in a high temperature environment, a durability experiment in which the motor operates alternate...

AI Technical Summary

Problems solved by technology

After replacing the motor 10 to be tested of a different type, it is often necessary to replace the motor controller 19 at the same time, resulting in higher costs

If the motor controller is not replaced at the same time, it is necessary to establish the constraint relationship between the rotational speed, torque and current of the motor to be tested 10 after replacement in the motor controller 19. This matching cycle is quite long, usually up to dozens of days. Often affects the progress of the experiment

Therefore, the existing motor durability test system has poor versatility

Images