A device and method for judging the phase sequence of three-phase windings of a brushless DC motor

Abstract

The invention discloses an apparatus for determining the phase sequence of a three-phase winding of a brushless direct current motor. The apparatus comprises a direct-current source, a three phase bridge type inverter, two current sensors and a PWM controller. And the invention also provides a method for determining the phase sequence of a three-phase winding of a brushless direct current motor. The method comprises the steps: selecting two phases connected with the current sensors as an A phase winding and a V phase winding, and taking the residual phase as a W phase winding; setting the A phase current as a set value, measuring the practical value of the A phase current, and performing PID adjusting after making a difference of the set value and the practical value so as to enable the practical value of the A phase current to follow the set value and to position a rotor to the position of the A phase winding; and using the same mode to enable a practical value of the V phase current to follow a set value of the V phase current while the rotor rotates, wherein if the rotor rotates clockwise, the V phase winding is corresponding to the B phase winding, and if the rotor rotates anticlockwise, the V phase winding is corresponding to the C phase winding. The apparatus and method for determining the phase sequence of a three-phase winding of a brushless direct current motor can scientifically and simply determine the wiring phase sequence of the three-phase winding when the wiring phase sequence of the three-phase winding of the brushless direct current motor is not known and the brushless direct current motor cannot operate normally.

Description

Technical field [0001] The invention belongs to the technical field of brushless DC motors, and particularly relates to a device and method for judging the phase sequence of the three-phase winding connection of the brushless DC motor. Background technique [0002] The brushless DC motor uses an electronic commutation device to replace the mechanical commutation device of a traditional DC motor, and has similar mechanical characteristics as a DC motor. Its magnetic steel is placed on the rotor and generates a rotating magnetic field drive by continuously changing the stator winding energization method The rotor turns. Because the rotor adopts a permanent magnet structure, the brushless DC motor has the characteristics of small size, light weight and simple structure. With the development of power electronics technology, the application of brushless DC motors has become more and more widespread. The phase sequence of the three-phase wiring of the brushless DC motor is the key to...

AI Technical Summary

Problems solved by technology

However, the early manufacturers of brushless DC motors did not have uniform marking standards 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 brushless DC motor will cause the three-phase winding wiring of the brushless DC motor to fail. identify the problem

In engineering applications, the original brushless DC motors are directly eliminated, and the motors matching the new controllers are repurchased, resulting in great waste

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