System and method for testing counter electromotive force of permanent magnet synchronous motor

Abstract

The invention discloses a permanent magnet synchronous motor back electromotive force testing system and method, and relates to the technical field of motor testing. Comprising a bench dynamometer, a tested motor, a motor electric controller and a bus voltage measuring device. Wherein an output shaft of the bench dynamometer is connected with the motor to be tested and is used for dragging the motor to be tested to rotate to generate electromotive force; the motor electric controller is connected with the tested motor and is used for converting three-phase alternating current generated by the tested motor into direct current; and a measuring probe of the bus voltage measuring equipment is connected with a direct-current bus end of the motor electric controller and is used for measuring a voltage value of the back electromotive force of the measured motor after rectification. The invention innovatively provides a simple, efficient and cost-controllable permanent magnet synchronous motor back electromotive force test method which can be conveniently used on a production line EOL rack, the method completely avoids the disassembly of the internal structure of the motor, and the back electromotive force test of the permanent magnet synchronous motor is efficiently and accurately carried out while the test cost is reduced.

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