Convenient method for controlling direction of rotation of synchronous motor of single-phase permanent magnet and motor using same

Abstract

The invention provides a convenient method for controlling direction of rotation of a synchronous motor of a single-phase permanent magnet. The method comprises the following steps: A. arranging a power switch of stator exciting current and ensuring the power switch to conform to the following requirements: when a rotor of the permanent magnet is motionless, the power switch is conducted after the power voltage is connected, or after the rotor of the permanent magnet rotates, the power switch is conducted if the direction of rotation conforms to the set requirement, or after the rotor of the permanent magnet rotates, the power switch is turned off if the direction of rotation is opposite to the set requirement, and when the rotor of the permanent magnet only shakes or wriggles, the power switch is conducted; B. arranging a permanent magnet rotor field polarity sensing device obtaining the real-time field polarity of the permanent magnet rotor in designated position; and C. using the simplest sequential logical circuit to complete each judgment in the step A, thus implementing control of the direction of rotation of the rotor of the permanent magnet. The invention has the advantages of simple and practical control method, simple control circuit, low cost, high reliability, strong interference resistance, capability of effectively reducing the noises of thyristor switches, etc.

Description

【Technical field】 [0001] The invention relates to a synchronous motor with permanent magnets, in particular to a synchronous motor with stationary armatures and rotating magnets, and in particular to a control circuit for the rotation direction of a single-phase permanent magnet synchronous motor. 【Background technique】 [0002] As we all know, single-phase AC synchronous or asynchronous motors produce pulsating magnetic fields because they only have one-phase power supply. The pulsating magnetic field can be decomposed into two rotating magnetic field components that are equal in size and opposite in direction, so they have no starting torque. For small or miniature single-phase permanent magnet synchronous motors, in fact, as long as the rotor shakes at the moment the stator excitation winding is powered on, it can keep rotating in a certain direction, because the rotating magnetic field generated by the rotor rotation weakens until it cancels the stator The opposite compo...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to avoid the disadvantages of the above-mentioned prior art and provide a convenient method for controlling the rotation direction of a single-phase permanent magnet synchronous motor, a single-phase permanent magnet synchronous motor provided with a steering control circuit, and a single-phase permanent magnet synchronous motor for single-phase The steering control circuit of the phase permanent magnet synchronous motor, the convenient method and the steering control circuit cleverly solve the problem of uncertain steering of the synchronous motor by means of each hardware module, and can reliably ensure that the synchronous motor runs in the set direction , has the advantages of simple and practical control method, simple control circuit, low cost, high reliability, strong anti-interference and can effectively reduce thyristor switching noise.

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