Motor driving circuit, motor assembly and application equipment

Abstract

The invention provides a motor driving circuit, a motor assembly and application equipment. The motor driving circuit comprises a bidirectional alternating current switch, a rectifying circuit, a first voltage reduction circuit, a switch control circuit, and a magnetic sensor, wherein the bidirectional alternating current switch and a motor are connected in series between the two ends of an external alternating current power supply; the bidirectional alternating current switch is connected between a first node and a second node; the rectifying circuit has a first input end and a second input end; the first voltage reduction circuit is connected between the first input end of the rectifying circuit and the first node; the switch control circuit is connected between the control end of the bidirectional alternating current switch and the output end of the rectifying circuit; the output end of the magnetic sensor is connected with the control end of the switch control circuit; and the magnetic sensor is used for detecting the magnetic field of a rotor of the motor and outputting a corresponding magnetic sensing signal. Therefore, it is ensured that the motor which applies the motor driving circuit is started and rotated in a fixed direction in power-on each time.

Description

technical field [0001] The invention relates to the technical field of motor drive, in particular to a motor drive circuit, a motor assembly and application equipment. Background technique [0002] The synchronous motor is an AC motor. The stator coil is powered by an AC power supply. The AC power supply generates a rotating magnetic field with NS pole changes at the stator poles of the motor. The rotating magnetic field attracts the rotor to rotate, and the rotor speed is the same as the frequency of the provided AC power supply. During the starting process of a traditional synchronous motor, the electromagnet of the stator generates an alternating magnetic field, through which the rotor is dragged to yaw and oscillate. The rotation is rapidly accelerated to synchronize with the alternating magnetic field of the stator. [0003] Since the polarity of the initial energization of the AC power supply and the stop position of the rotor are not fixed, it cannot be guaranteed th...

AI Technical Summary

Problems solved by technology

[0003] Since the polarity of the initial energization of the AC power supply and the stop position of the rotor are not fixed, there is no guarantee that the rotor will rotate in the same direction every time it is started.

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