Commutation torque ripple restraining method and system for brushless DC (Direct Current) motor driving system

A brushed DC motor and drive system technology, applied in the field of mechanical engineering, can solve the problems of sensitive motor parameters, lack of universal applicability, and difficulty in determining the commutation time.
CN103501146AInactive Publication Date: 2014-01-08CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
Publication Date
2014-01-08
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a commutation torque ripple restraining method and a commutation torque ripple restraining system for a brushless DC (Direct Current) motor driving system. The method comprises the following steps: (1) when T*-T is more than AT, carrying out PWM (Pulse Width Modulation) on a switching tube of an off phase, enabling a switching-in phase to be constantly communicated with a non-conducting phase, enabling the PWM duty cycle dhigh of the off switch to meet the condition and ensuring that a current rise speed of the switching-in phase is equal to a current fall speed of the off phase so as to restrain generation of a commutation torque ripple; and (2) when T-T* is more than delta T, carrying out PWM on switching tubes of the switching-in phase and the non-conducting phase, still switching off the off phase and enabling the PWM duty cycle dlow of the switching tubes of the switching-in phase and the non-conducting phase of the off phase to meet the condition. The method uses a torque ripple deviation as a feedback quantity and is matched with PWM to implement torque ripple restraint, has an excellent effect and is easy to implement.
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Description

technical field

[0001] The invention belongs to the field of mechanical engineering, and relates to a commutation torque ripple suppression method and system for a brushless DC motor drive system. Background technique

[0002] When analyzing the permanent magnet brushless DC motor, it is always assumed that its back EMF waveform is a trapezoidal wave with a flat top width of 120°. However, during the manufacturing process of the motor, technological problems such as insufficient rotor magnetization and asymmetrical windings may occur, and it is difficult to achieve an ideal trapezoidal wave in the actual back EMF waveform of the permanent magnet brushless DC motor. Therefore, the traditional current and speed double closed-loop control will produce larger torque ripple and poor dynamic performance. In addition, many factors such as cogging design process, current commutation, and armature reaction will also cause torque ripple of brushless DC motors, among which current com...

Claims

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