Motor drive control circuit and system

Abstract

The invention relates to a motor drive control circuit and system. According to the invention, a starting circuit is arranged at the front end of a motor; the starting circuit can control the motor tobe started to generate induced electromotive force when the motor working in a counter electromotive force commutation mode is static, a corresponding observation waveform is obtained, and therefore,rotor position information of the motor is obtained; and meanwhile, a back electromotive force filtering and shaping circuit is arranged in front of a decoding circuit, and the input end of the backelectromotive force filtering and shaping circuit is connected between a main control circuit and the motor, so processing can be carried out according to a sampling signal and a back electromotive force signal of the motor, and filtering of the sampling signal and elimination of back electromotive force pulse sharp waves are realized, and therefore, the problem of interference in the low-speed operation process of the motor is avoided. Through a technical scheme of an embodiment in the invention, the motor can be controlled to be started at a low speed to obtain the position information of the motor rotor when the motor is in a static state, filtering optimization can be carried out on signals in the operation process of the motor, harmonic interference is avoided, and high driving reliability is achieved.

Description

technical field

[0001] The present application relates to the technical field of motors, in particular to a motor drive control circuit and system. Background technique

[0002] With the development of power electronics technology, especially the emergence of new permanent magnet materials, the development process of permanent magnet synchronous motors has been greatly promoted. The stable operation of the permanent magnet synchronous motor control system is based on the closed-loop control system, and the most important thing in the control system is to accurately obtain the rotor position and speed signals in order to accurately identify the motor running state, so as to control the normal start of the motor and run. The position sensorless control technology has the advantage of simple structure, and it is currently widely used in the occasions of no-load and light-load starting of the motor. The position sensorless control technology refers to the completion of closed-...

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