Testing method for mechanical characteristics of alternating-current permanent magnet motors

The invention relates to a testing method for mechanical characteristics of alternating-current permanent magnet motors, and belongs to the technical field of motor testing. According to the method, the winding structure characteristics of multiple units of the multi-phase multi-unit permanent magnet synchronous motors are used when the mechanical characteristics of the motor is predicted, the mechanical characteristics of one unit motor can be predicted by testing related motor parameters under the operation condition that one unit motor operates electrically, and one unit motor operates in an electricity generating mode, and then the mechanical characteristics of the whole motor are obtained through the relation between one unit output torque and whole motor output torque, and therefore not only is the mechanical characteristics of the motor predicted, but also an extra loading device is omitted. In the testing process of the mechanical characteristics of the multi-phase multi-unit motors by the adoption of the method, a motor shell and shaft extension of the motors do not need special fixture, an external device is not needed, the motors have the advantages of being simple in structure and stable in property, and the testing method has the advantages of being reliable in data and the like and can meet testing requirements for testing the mechanical characteristics of the common permanent magnet synchronous motor.