Brushless direct current motor low-power-consumption driving system and method based on Buck converter

Abstract

The invention discloses a brushless direct current motor low-power-consumption driving system and method based on a Buck converter, and the brushless direct current motor low-power-consumption driving system based on the Buck converter adopts a voltage controller and a current controller which are cascaded to control the output voltage of the Buck converter, thereby achieving the high-precision control of the current of a motor. A self-adaptive notch filter is added to a current loop feedback channel to reduce distortion caused by non-ideal counter electromotive force in direct-current bus current, and alternating-current components in feedback quantity are removed. A composite structure of a PI controller and a repetitive controller is used in a forward channel of a voltage loop, a direct-current component and an alternating-current component of output voltage of the Buck converter are controlled respectively, and the repetitive controller is used for eliminating disturbance caused by non-ideal counter electromotive force to the output voltage of the Buck converter. In the low-power-consumption driving system, the direct current bus voltage can well track the required reference signal, the control performance of the motor current is enhanced, the operation efficiency of the brushless direct current motor can be improved, and the power consumption of the system is reduced.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a low-power drive system and method for a brushless DC motor based on a Buck converter. Background technique [0002] Since the brushless DC motor can improve the operating efficiency of the equipment, save energy, and has a wide speed range, good low-speed performance, large starting torque, good linearity, and high work efficiency, it has been widely used in air conditioners, refrigerators, Washing machines, fans and other home appliances and industrial applications. With the development and application of motor technology, power electronics technology, digital control technology, control theory and sensor technology, the general control technology of brushless DC motors has become increasingly mature. Brushless DC motors usually use a classic PI controller to perform double closed-loop control on the speed and current to achieve speed adjustment or constant speed and stable speed...

AI Technical Summary

Problems solved by technology

However, for most motors, the back electromotive force is difficult to achieve the ideal trapezoidal wave, but between the trapezoidal wave and the sine wave, which makes the current distortion due to the hysteresis introduced by the Buck converter in the high-speed stage, increasing the motor power consumption

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