Permanent magnet direct-current motor commutation control device and method based on sliding mode observer

Abstract

The invention discloses a permanent magnet direct current motor commutation control device and method based on a sliding mode observer. The device comprises a processor module, a voltage sampling module, a current sampling module, a photoelectric isolation module and the like. The input end of the processor module is connected with the voltage sampling module and the current sampling module, and the output end of the processor module is connected with the photoelectric isolation module; the sliding mode observer is constructed based on the data obtained by the voltage sampling module and the current sampling module, and motor commutation and closed-loop control are realized; the input ends of the voltage sampling module and the current sampling module are connected with a permanent magnetDC motor, and the output ends are connected with the processor module; the input end of the photoelectric isolation module is connected with the processor module, and the output end is connected witha driving circuit module; and the input end of the drive circuit module is connected with the photoelectric isolation module, and the output end is connected with the permanent magnet DC motor. The control device and method are applied to a permanent magnet direct current motor sensorless control system, back electromotive force is calculated in real time, and commutation control is achieved.

Description

technical field [0001] The invention relates to a position sensorless commutation control device for a permanent magnet direct current motor, in particular to a permanent magnet direct current motor phase commutation control device and method based on a sliding mode observer. Background technique [0002] The permanent magnet DC motor body has the advantages of simple physical structure, quick speed adjustment response, strong load capacity, and high power factor. Therefore, this type of motor has important application value in the production activities of various fields of human beings. [0003] In order to detect continuous permanent magnet DC motor rotor position information and realize motor commutation control, permanent magnet DC motors generally use electromagnetic induction, Hall magnetosensitive or photoelectric sensors for rotor position detection. However, the above-mentioned position sensor not only increases the volume and cost of the motor, but also is difficu...

AI Technical Summary

Problems solved by technology

[0005] By constructing an observer with known state quantities, the observed value of the back electromotive force is obtained, and the commutation control of the motor is realized. It has the characteristics of simple principle and good stability. Accurate position detection and stable commutation

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