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Method for suppressing commutation torque ripples of brushless DC motor

A brushed DC motor, phase torque technology, applied in torque ripple control and other directions, can solve complex cost and other problems, and achieve the effects of increasing output power, reducing current lag, and suppressing torque ripple

Active Publication Date: 2017-02-22
威海天达汽车科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it needs to change the structure of the control circuit, which is more complicated and costly

Method used

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  • Method for suppressing commutation torque ripples of brushless DC motor
  • Method for suppressing commutation torque ripples of brushless DC motor
  • Method for suppressing commutation torque ripples of brushless DC motor

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Embodiment Construction

[0031] A method for suppressing commutation torque ripple of a brushless DC motor, the method is applicable to the control strategy of H-PWM-L-ON, and is characterized in that it comprises the following steps:

[0032] The drive inverter described in the present invention is an inverter that drives a motor.

[0033] 1), in the motor controller, enter the interrupt after each PWM cycle of the inverter drive signal ends;

[0034] 2) After entering the interrupt, collect the value of the three-phase current of the motor and the hall (Hall) signal, and judge whether the next commutation is the upper bridge or the lower bridge of the inverter according to the hall position of the motor;

[0035] 3) If it is judged as upper bridge commutation, according to the formula: Find the number of cycles ahead of the next commutation of the upper bridge of the inverter; if it is judged to be commutation of the lower bridge, according to the formula: Find the number of cycles ahead of the ...

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Abstract

The invention discloses a method for suppressing the commutation torque ripples of a brushless DC motor. The invention relates to the technical field of control technology of brushless DC motors. The method includes the following steps: after entering a break off, conducting upper bridge commutation based on the formula: (as shown in the description) to resolve cycle count of advanced commutation; conducting lower bridge commutation based on the formula (as shown in the description) to resolve cycles of advanced commutation; the PWM cycle count n1 during the ongoing period of the previous Hall signal; the PWM cycle count n2 during the ongoing period of the current Hall signal; when n1-n2 is greater than n upper or n lower, conducting no commutation, and when n1-n2 is not greater than n upper or n lower, conducting commutation: an upper bridge-non-commutation phase duty cycle staying at 1, changing an on-phase duty cycle from 0 to a duty cycle d of an off-phase duty cycle prior to the commutation, the off-phase duty cycle being changed to doff; a lower bridge-non-commutation phase duty cycle staying at d, changing the on-phase duty cycle from 0 to the duty cycle 1 of the off-phase prior to the commutation, the off-phase duty cycle being changed to doff. According to the invention, the method can be applied to a wide range of rotation speeds and load changes and has high electric output power.

Description

technical field [0001] The present invention relates to the technical field of brushless DC motor control. Specifically, it is a method of controlling the motor to commutate a period of time before the traditional commutation time, and simultaneously modulating the three-phase voltage during the commutation period to suppress the commutation of the brushless DC motor. The control method of phase torque ripple. Background technique [0002] Brushless DC motors have been widely used in production and life due to a series of advantages such as high power density, stable structure, and simple control. However, due to the large commutation torque ripple generated during the operation of the motor, the application of brushless DC motors in occasions requiring high precision is limited. Solving this problem has become the focus and difficulty of many scholars. [0003] There are two main reasons for the commutation torque ripple of brushless DC motors: the current change rate of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/10
CPCH02P6/10
Inventor 王大方朱洪彪贾隆王苗然宋鹏王明玉
Owner 威海天达汽车科技有限公司
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