Brushless direct current motor control method capable of reducing commutation torque ripple

A technology of brush DC motor and control method, which is applied in the direction of torque ripple control, monitoring commutation, etc., can solve the problems of motor electromagnetic torque ripple, vibration and noise, motor speed fluctuation, etc., and achieve the purpose of suppressing commutation torque ripple, Reduce the effect of inaccurate detection and solve difficult detection

Pending Publication Date: 2022-07-29
南京凌博电子科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually, BLDCM is driven by square wave, and the two phases are turned on during normal operation. However, due to the particularity of its system, during the commutation process of BLDCM, due to current commutation, pulsation of the electromagnetic torque of the motor will be generated, which will cause the motor speed to fluctuate and generate vibration and noise
The torque ripple of BLDCM in the commutation process makes BLDCM unable to be applied to high-precision occasions, which limits the application of BLDCM. Therefore, how to suppress torque ripple is an important research topic of BLDCM

Method used

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  • Brushless direct current motor control method capable of reducing commutation torque ripple

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Embodiment Construction

[0018] The specific embodiments of the present application will be further described below with reference to the accompanying drawings.

[0019] This application discloses a brushless DC motor control method that can reduce commutation torque ripple. Please refer to figure 1 Equivalent control model shown, DC bus voltage Connect the inverter circuit. The inverter circuit here can use a common three-phase three-arm inverter circuit. The output end of each bridge arm of the inverter circuit passes through the winding resistance in turn. and winding inductance Connect one phase winding of a BLDC motor. like figure 1 Middle, upper arm switch tube and lower arm switch The middle point of the formed bridge arm is connected to the A-phase winding as the output terminal, and the back EMF of the A-phase winding is recorded as , the current of the A-phase winding is recorded as . Upper arm switch tube and lower arm switch The middle point of the formed bridge arm is c...

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Abstract

The invention discloses a brushless direct current motor control method capable of reducing commutation torque ripple, and relates to the field of brushless direct current motors, the method adopts different duty ratios to simultaneously modulate three phase windings of a brushless direct current motor, and according to the change rule of the back electromotive force of a turn-off phase along with the commutation time, the duty ratios of the three phase windings of the brushless direct current motor are adjusted. The commutation torque ripple caused by overlong commutation time and the commutation torque ripple caused by the body structure and the working principle of the brushless direct current motor are comprehensively considered and quantified into a comprehensive optimization index to determine the modulation duty ratio of three phase windings, so that the difference value between the current change rates of an on phase and an off phase during commutation of the motor can be reduced; further, commutation torque ripple is suppressed.

Description

technical field [0001] The present application relates to the field of brushless DC motors, in particular to a brushless DC motor control method capable of reducing commutation torque ripple. Background technique [0002] Brushless Direct Current Motor (BLDCM) has the advantages of simple structure, simple control and low noise, so it is widely used in transportation, medical equipment, household appliances and other fields. Usually BLDCM is driven by a square wave, and the two phases are turned on during normal operation. However, due to the particularity of its system, during the commutation process of the BLDCM, due to the current commutation, the electromagnetic torque of the motor will be pulsated, causing the motor speed to fluctuate and generate vibration and noise. The torque ripple of BLDCM in the commutation process makes BLDCM unable to be applied in high-precision occasions, which limits the application of BLDCM. Therefore, how to suppress torque ripple is an im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/10H02P6/12
CPCH02P6/10H02P6/12
Inventor 谈正言蒋建国
Owner 南京凌博电子科技有限公司
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