Load drive device, motor assembly and motor drive device

Abstract

The invention provides a motor driving device, a motor assembly using the same and a load driving device. The motor driving device comprises a phase lock control circuit, a trigger circuit and a bidirectional electronic switch; the phase lock control circuit is used for tracking frequency and a phase of an AC power supply and emitting a phase lock rectangle wave string to a trigger circuit, wherein the phase lock rectangle wave string is changed from low frequency to high frequency until being the same in frequency and the phase with the AC power supply; the trigger circuit controls a bidirectional electronic switch to switch between conduction and cut-off in a preset mode according to an electric level of the phase lock rectangle wave string before a pulse width of a high electric level or a low electric level of the phase lock rectangle wave string is smaller than a power supply cycle; when the pulse width of the high electric level or the low electric level of the phase lock rectangle wave string is smaller than the power supply cycle, the trigger circuit controls the bidirectional electronic switch to conduct; and at least one of the phase lock control circuit, the trigger circuit and the bidirectional electronic switch is arranged on a semiconductor substrate. The motor driving device can guarantee that the motor can be started to rotate along a fixed direction every time when the motor is electrified.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a motor driving device for driving a motor, a motor component and a load driving device using the motor driving device. Background technique [0002] The armature magnetic field of a single-phase synchronous motor can be regarded as a pulsating magnetic field synthesized by two positive and negative rotating magnetic fields. When the magnetic pole starts, there is a dead point where the torque is 0. The traditional starting method usually adopts uneven air gap and uneven magnetic circuit, so that the magnetic pole N can stop at the predetermined initial position when it is stationary, that is, between 2-178 electrical angles or 182-358 electrical angles, so as to avoid starting force. 0 dead point. However, when the power is turned on, the initial phase of the current is random, and it is impossible to ensure that the force on the magnetic pole is in the specified direction of rotat...

AI Technical Summary

Problems solved by technology

However, when the power is turned on, the initial phase of the current is random, and it is impossible to ensure that the force on the magnetic pole is in the specified direction of rotation. Therefore, there are problems such as indeterminate rotation direction, startup vibration, small startup torque, and startup failure with this method.

Images