Torque ripple suppression method based on adaptive noise cancellation

Abstract

The invention relates to a torque ripple suppression method based on adaptive noise cancellation, which is implemented mainly through an MCU, a power driving module, a current detection module and anadaptive noise cancellation module, wherein the MCU, the power driving module and the current detection module are sequentially connected, the current detection module is connected with a brushless DCmotor, and the brushless DC motor is connected to the MCU through the adaptive noise cancellation module; and the MCU module forms a current and speed double closed-loop structure through receiving rotor position feedback signals and current feedback signals which are acquired by a HALL sensor via A / D conversion and speed calculation according to a specific control strategy, and a complete doubleclosed-loop servo system is formed. According to the invention, the adaptive noise cancellation method is introduced into a speed-current double closed-loop speed regulation system of a permanent magnet brushless DC motor for eliminating the noise superimposed in HALL signals, thereby avoiding the noise from getting into the motor servo system, and thus reducing the torque ripple caused by mixingthe noise into the HALL signals.

Description

technical field [0001] The invention relates to the field of motors, in particular to a torque ripple suppression method based on adaptive noise elimination. Background technique [0002] The permanent magnet brushless motor can be regarded as a DC motor that replaces the mechanical commutation with an electronic commutation device. The permanent magnet DC brushless motor is mainly composed of a permanent magnet motor body, a rotor position sensor and an electronic commutation circuit. Regardless of the structure or control method, the permanent magnet brushless DC motor has many similarities with the traditional DC motor: the stator poles of the brushed DC motor are replaced by a rotor equipped with permanent magnets; pivot; replace the mechanical commutator and brushes with an electronic commutator consisting of a solid-state inverter and a shaft position detector. [0003] In an inductive permanent magnet brushless DC motor, the HALL sensor is indispensable as a device f...

AI Technical Summary

Problems solved by technology

As a sensitive device, the HALL sensor has varying degrees of sensitivity to light, heat, and mechanical stress in addition to magnetic sensitivity. When the brushless DC motor works in a complex environment such as dusty, high and low temperature, the noise is easy to superimpose Entering the servo system on the HALL feedback signal affects the processing of the real HALL signal and increases the torque ripple of the brushless DC motor

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