Control device and method for reducing commutation torque ripple of brushless direct-current motor

A brushless DC motor and control device technology, applied in torque ripple control, electronic commutator and other directions, can solve the problems of reducing the commutation torque ripple of brushless DC motor, unable to eliminate torque ripple, etc. Reduced commutation torque ripple and simple angle calculation

Active Publication Date: 2017-04-26
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0011] The purpose of the present invention is to solve the problem in the prior art that the torque ripple cannot be eliminated by controlling the current slope of the on-phase and off-phase to be consistent, and to provide a method for reducing the commutation torque ripple of the brushless DC motor through the advance angle control Control device and method

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  • Control device and method for reducing commutation torque ripple of brushless direct-current motor
  • Control device and method for reducing commutation torque ripple of brushless direct-current motor
  • Control device and method for reducing commutation torque ripple of brushless direct-current motor

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Embodiment Construction

[0058] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0059] Such as figure 1 Shown is a block diagram of a brushless DC motor speed and current double closed-loop control system including the method of the present invention. It consists of brushless DC motor, three-phase full-bridge inverter, Hall position sensor, PWM generation and logic control, feedback current selection, current regulator, speed calculation, speed PI adjustment and advance angle calculation module. Among them, the Hall position sensor is installed on the brushless DC motor, and outputs the three-phase Hall position signal H a 、H b 、H c To the speed calculation module and the advance angle calculation module, the speed calculation module outputs the mechanical angular velocity ω of the motor rotor rotation; the given speed is subtracted from the actual feedback speed of the motor to obtain the speed error, and then the PI regulator ...

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Abstract

The invention relates to a control device and method for reducing the commutation torque ripple of a brushless direct-current motor and belongs to the permanent magnet motor control field. According to the control device and method of the invention, phase current of the stator of the brushless direct-current motor and the output signals of a Hall sensor are detected, so that an advance angle calculation module is built; and the advance commutation angle of the brushless direct-current motor is adjusted in real time under different rotation speeds and load states, so that the intersection time point of turning on phase current and turning off phase current in commutation can be consistent with the intersection time point of corresponding counter electromotive forces, and therefore, the commutation torque ripple can be decreased. The control device and method of the invention do not rely on motor parameters, do not require complex formula calculation and can effectively reduce the commutation torque ripple.

Description

technical field [0001] The invention relates to an advance angle control strategy and a realization method of a brushless DC motor, belonging to the field of permanent magnet motor control. Background technique [0002] Brushless DC motors have the advantages of high power density, high torque-to-current ratio, and simple structure. In recent years, with the improvement of the performance of permanent magnets, brushless DC motors have been more and more widely used in industrial production. [0003] The ideal back EMF waveform of the brushless DC motor is a trapezoidal wave, which is controlled by a 120° conduction mode, and a constant torque can be generated when a square wave current is passed. But in reality, due to the existence of winding inductance, it takes a certain amount of time for the current to rise and fall, and the current value cannot quickly drop from the steady-state value to 0 or rise from 0 to the steady-state value, which will lead to an obvious problem ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/10H02P6/17
CPCH02P6/10
Inventor 郭鸿浩胡明桦杨艳
Owner NANJING UNIV OF POSTS & TELECOMM
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