Method and device for distinguishing phase sequence of three-phase windings of permanent magnet synchronous motor

Abstract

The invention discloses a method and device for distinguishing a phase sequence of three phase windings of a permanent magnet synchronous motor. The method comprises the steps of selecting two phases connected with current sensors as a phase-A winding and a phase-V winding, and adopting the other phase as a phase-W winding; setting the phase-A current as a set value, measuring an actual value of the phase-A current, obtaining a difference between the set value and the actual value and then performing PID adjustment, wherein a rotor is positioned to the position of the phase-A winding when the actual value of the phase-A current follows the set value, and the rotor will rotate when the actual value of the phase-V current follows the set value in the same way; if clockwise deflection is performed, enabling the phase-V winding to correspond to the phase-B winding, and if the rotor performs anticlockwise defection, enabling the phase-V winding to correspond to the phase-C winding. The device for achieving the method comprises a direct-current power source, a three-phase bridge type inverter, two current sensors and a PWM controller. The phase sequence of wiring of the three-phase windings can be scientifically judged on the condition that the wiring phase sequence of the three phase windings of the permanent magnet synchronous motor is not known and the permanent magnet synchronous motor cannot be operated normally.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet synchronous motors, in particular to a method and a device for judging the phase sequence of three-phase windings of permanent magnet synchronous motors. Background technique [0002] The permanent magnet synchronous motor uses an electronic commutation device to replace the mechanical commutation device of the traditional DC motor, and has similar mechanical characteristics to the DC motor. The rotor turns. Since the rotor adopts a permanent magnet structure, the permanent magnet synchronous motor has the characteristics of small size, light weight and simple structure. With the development of power electronics technology, the application of permanent magnet synchronous motor is more and more extensive. The phase sequence of the three-phase wiring of the permanent magnet synchronous motor is the key to the normal operation of the permanent magnet synchronous motor. However, the early ...

AI Technical Summary

Problems solved by technology

However, the early manufacturers of permanent magnet synchronous motors did not have a unified standard for the three-phase winding wiring of the motor, and many factors such as the wear and aging of the three-phase wiring during the long-term operation of the permanent magnet synchronous motor will cause the three-phase winding wiring of the permanent magnet synchronous motor to fail. identify the problem

In engineering applications, the original permanent magnet synchronous motor is directly eliminated, and the motor matching the new controller is repurchased, resulting in great waste

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