No-position permanent magnet brushless direct current motor control device and control method thereof

Abstract

The present invention relates to the motor control technology field, especially to a no-position permanent magnet brushless direct current motor control device and a control method thereof. The control method comprises: setting the presetting rotary speed data of a motor; when the motor is running, collecting the back electromotive force on the motor, and obtaining three groups of back electromotive force electric signals; arranging the back electromotive force electric signals collected at the same time according to the presetting sequence, and obtaining position signals, wherein each position signal corresponds to the only one rotor movement region; performing statistics of all the position signals in the presetting time, obtaining the real rotary speed data, and comparing the real rotary speed data with the presetting rotary data, and if the comparison result is that the real rotary speed data is not consistent to the presetting rotary data, performing corresponding regulation control of the rotary speed of the motor according to the comparison result. The no-position permanent magnet brushless direct current motor control device and the control method thereof allow the production cost of the motor to be reduced and the structure of the motor to be simplified, and are helpful for the popularization and the application of the brushless direct current motor in many fields.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a control device for a positionless permanent magnet brushless DC motor and a control method for a positionless permanent magnet brushless DC motor. Background technique [0002] Compared with brushed DC motors, brushless DC motors have the characteristics of wide application range, long service life, fast speed, low energy consumption, and easy maintenance. Therefore, brushless DC motors are the main development direction of motors in the future; among them , the control method of the brushless motor is the key to the performance of the brushless DC motor, but because in the prior art, the position sampling of the brushless DC motor is based on the Hall sensor, its cost is relatively high and the structure is relatively complicated, so in Some motor equipment, such as: brushed DC motors are still used on sewing machines; it greatly hinders the promotion and use of brushles...

AI Technical Summary

Problems solved by technology

[0002] Compared with brushed DC motors, brushless DC motors have the characteristics of wide application range, long service life, fast speed, low energy consumption, and easy maintenance. Therefore, brushless DC motors are the main development direction of motors in the future; among them , the control method of the brushless motor is the key to the performance of the brushless DC motor, but because in the prior art, the position sampling of the brushless DC motor is based on the Hall sensor, its cost is relatively high and the structure is relatively complicated, so in Some motor equipment, such as: brushed DC motors are still used on sewing machines; it greatly hinders the promotion and use of brushless DC motors in various industries, and also hinders the development of various motor equipment

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