Motor starting and speed-regulation control circuit and driving control method thereof

Abstract

The invention is suitable for the field of power electronics and electronic control and provides a motor variable-frequency starting and speed-regulation control circuit and a driving control method thereof. The circuit comprises a variable-frequency control unit for generating a triggering signal; a bidirectional switch unit used for controlling bidirectional gating according to the triggering signal to enable a single-phase power frequency AC power supply to be converted into a three-phase variable-frequency AC power supply and form a variable-speed motor rotating magnetic field to control motor starting and speed regulation; and a protection unit used for detecting motor current and controlling the motor current through pulse-width modulation chopping wave. The triggering signal controls each bidirectional silicon controlled rectifier to realize bidirectional conduction under the single-phase power frequency AC power supply, and the three-phase variable-frequency AC power and the variable-speed motor rotating magnetic field are generated in the selective conduction process through the bidirectional silicon controlled rectifier, thereby realizing motor starting and speed regulation. The motor starting and speed-regulation control circuit is simple and reliable in structure and low in cost, and expands use range of a three-phase permanent-magnet asynchronous motor.

Description

technical field [0001] The invention belongs to the field of motors, and in particular relates to a motor starting and speed regulation control circuit and a driving control method thereof. Background technique [0002] At present, the three-phase permanent magnet synchronous motor is more and more widely used in people's production and life because of its simple structure, firmness, high efficiency and stable speed. Among them, the three-phase permanent magnet synchronous motor and BLDC (Brushless Direct Current Motor, brushless DC The combination of motor) and driver has the advantages of small size, light weight, high efficiency, adjustable speed, simple structure, reliable operation, and convenient maintenance. It can adapt to the small and light weight of the motor, high output power, and use under DC power supply. Therefore, it is increasingly used in household appliances, electric tools, medical equipment and light industrial equipment. [0003] However, the three-ph...

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Problems solved by technology

[0006] The purpose of the embodiment of the present invention is to provide a motor starting and speed regulation control circuit, aiming at solving the problem of starting the three-phase permanent magnet synchronous motor in the existing way, The problem of complex process and high cost

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