A system and method for suppress commutation torque ripple of a brushless DC motor

Abstract

The invention provides a commutation torque ripple suppression system and a method of a brushless DC motor, which relate to the technical field of motor control. The method comprises the following steps: (1) obtaining motor rotor position information according to a Hall sensor inside a brushless DC motor, and obtaining feedback quantity of motor actual speed through A / D conversion and DSP operation; 2, calculating that error Delta n between the actual speed of the motor and the given quantity of the speed of the motor according to the step 1, estimating the disturbance of the system and the controlled object and eliminating the disturbance through the output of the system control quantity and the output feedback of the controlled object, and obtaining an inner loop current set value iref;3, comparing that set value of the inner loop current and the feedback value of the inn loop current given by the current sampling circuit module, and controlling the conduction and the shutdown of the corresponding pow transistor in combination with the rotor position signal of the motor. This method has strong robustness and adaptability. The commutation torque ripple can be well embedded in thecommutation period, and the commutation torque ripple can be effectively suppressed.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a system and method for suppressing commutation torque ripple of a brushless DC motor. Background technique [0002] Brushless DC motor (BLDCM) is widely used in aerospace, military equipment, industrial automation and other fields due to its advantages of high power density, high efficiency and small size. However, the torque ripple problem in the operation of the brushless DC motor has a great influence on the realization of precise position and high-performance speed control. The torque ripple of brushless DC motor mainly includes cogging torque ripple, torque ripple caused by non-ideal back electromotive force, and commutation torque ripple. Among them, commutation torque ripple is the main component of brushless DC motor torque ripple. Moreover, the brushless DC motor itself is a nonlinear, strongly coupled, multivariable system, and it is difficult to obtain a more ...

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Problems solved by technology

Moreover, the brushless DC motor itself is a nonlinear, strongly coupled, multivariable system, and it is difficult to obtain a more accurate mathematical model. In actual use, some of its own parameters will have a certain perturbation around the rated value, and the external load Changes will also bring disturbances, so the robustness and adaptability of its control system have always been poor, which also has a certain impact on the suppression of brushless DC motor commutation torque ripple. Both the deterministic disturbance and the internal disturbance of the control object have strong adaptability and robustness

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