Two-phase permanent magnet synchronous motor control circuit and control method

Abstract

The invention provides a two-phase permanent magnet synchronous motor control circuit and a control method. The two-phase permanent magnet synchronous motor control circuit comprises a single-chip microcomputer circuit (1), a CPLD circuit (11), two Hall sensor circuits (2), two in-phase proportional amplifier circuits (3), a second-order low-pass filter circuit (4), a speed compensation circuit (5), two filter amplification circuits (10), two square wave generation circuits (9), two analog multiplier circuits (8) and a high-low speed switching circuit (7). And two motor power amplifier circuits (6). Low-speed starting of the motor and correctness control of the starting direction are achieved through the phase sequence relation output by the two Hall sensors and setting of the rotating speed of the motor of the single-chip microcomputer. The quick starting process is converted into counter electromotive force control, and is realized by a method of sensing counter electromotive force by a pair of signal coils in a motor armature winding; the speed stabilizing process is realized by phase locking of the single-chip microcomputer; the quick starting time of the motor is less than or equal to 3s, and the steady speed precision reaches 10 <-4 >.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and in particular relates to a control circuit and a control method of a two-phase permanent magnet synchronous motor. Background technique [0002] The permanent magnet synchronous motor is a brushless DC motor without a position sensor and an iron-core armature, which uses back EMF commutation. The armature windings of permanent magnet synchronous motors are divided into two-phase, three-phase or multi-phase according to the number of phases, and there are various forms of star, delta and disconnected according to the winding connection mode. The advantages of permanent magnet synchronous motors are simple structure, no iron core armature, brushless, no position sensor, reliable operation, long life; high efficiency, generally up to more than 90%, therefore, low heat generation of the motor; high speed stability; The speed regulation performance of the motor is good, and it is easy...

AI Technical Summary

Problems solved by technology

But at the same time, the permanent magnet synchronous motor also has the following disadvantages: the motor itself has no starting torque, it is difficult to start, and there is a dead point. It needs to use an electronic starting circuit to start, but sometimes it will reverse when starting, and it will reach the rated synchronous work after starting. The rotation time is also longer

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