Brushless direct current motor control method and device, terminal equipment and storage medium

Abstract

The invention relates to the technical field of motor control, and provides a brushless direct current motor control method and device, terminal equipment and a storage medium. According to the invention, the control method comprises the steps: employing a six-step square wave control method to control the brushless direct current motor, detecting a counter electromotive force of output signals ofeach phase of the motor, and searching a zero crossing point of the counter electromotive force in a current commutation period; according to the position relative relationship between the zero crossing point and the midpoint of the current commutation period, adjusting the next commutation period and the next commutation time point of the motor, so the zero crossing point of the counter electromotive force in the next commutation period is close to the midpoint of the next commutation period. Through the arrangement, each commutation of the motor can promote the zero crossing point of the counter electromotive force to approach to the midpoint of the commutation period, and finally, the control target that the zero crossing point of the counter electromotive force coincides with the midpoint of the commutation period is achieved. The control method is simple, has low requirements on basic software and hardware of the system, and has a wide application prospect.

Description

technical field [0001] The present application relates to the technical field of motor control, and in particular to a control method, device, terminal equipment and storage medium of a brushless DC motor. Background technique [0002] Brushless DC motors use semiconductor switching devices to achieve electronic commutation, that is, electronic switching devices are used to replace traditional contact commutators and brushes. They have the advantages of high reliability, no commutation sparks, and low mechanical noise. They are widely used in video recorders. , electronic instruments and various automated office equipment. [0003] Compared with brushed motors, brushless motors reduce the number of mechanical commutation brushes, and the structure is simpler and more reliable, but the control is more complicated than brushed motors. It is often necessary to add an additional position sensor to detect the rotor position of the motor. According to the position of the rotor Di...

AI Technical Summary

Problems solved by technology

However, the existing control methods of brushless motors without position sensors are relatively complicated, and the

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