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Method for controlling turn-off phase delay time of brushless DC motor

A brushed DC motor and delay time technology, applied in the direction of torque ripple control, can solve the problems of commutation torque fluctuation, limit the application range of the motor, motor jitter, etc., and achieve the effect of weakening the high-speed commutation torque ripple

Inactive Publication Date: 2018-11-23
张新华
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The commutation torque fluctuation generated during the commutation of brushless DC motors can cause motor vibration and noise, which limits the application range of this type of motor

Method used

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  • Method for controlling turn-off phase delay time of brushless DC motor

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Embodiment Construction

[0014] The technical solutions and beneficial effects of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0015] Such as figure 1 As shown, the present invention provides a method for controlling the delay time of a brushless DC motor shutdown phase, comprising the following steps:

[0016] Step 1. Make the brushless DC motor run stably at high speed;

[0017] Step 2. Determine the on-phase X, off-phase Y, and non-commutation phase Z of the brushless DC motor during the commutation process, and record the current of the on-phase X in the commutation process of the brushless DC motor from the beginning of commutation The interval time T1 between the moment and the moment when the current amplitude of the open phase X is equal to the current amplitude of the non-commutated phase Z;

[0018] Step 3. Record the interval time T2 between the current of the phase Y turned off during the commutation process of the brushless DC ...

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Abstract

The invention discloses a method for controlling off phase delay time of a brushless DC motor, the control method comprises the steps of: recording a time T1 from the time when phase current is started to turn on to the time when the amplitude of the turn-on phase current is equal to the amplitude of the non-commutated phase current during the brushless DC motor commutation in the operation that the brushless DC motor is running at high speed and high speed; recording a time T2 from the time when the turn-off phase current is turned off to the time when the current drops to 0 during the commutation of the brushless DC motor; subtracting the T2 from the T1 to obtain a deltaT; in the subsequent commutation process, controlling the turn-off phase delay deltaT from the commutation time and then turning off. Therefore, the average current rate of change of the turn-off phase and the turn-on phase is the same during the commutation process, thereby achieving the purpose of weakening the high-speed commutation torque ripple of the brushless DC motor at this speed.

Description

technical field [0001] The invention belongs to the field of brushless direct current motor control, and relates to a brushless direct current motor, in particular to a method for controlling the phase failure delay time of the brushless direct current motor. Background technique [0002] Brushless DC motors have many advantages such as simple structure, high power density, and simple control. In recent years, brushless DC motors have been increasingly widely used in industrial fields such as high-performance speed regulation systems and servo control systems. [0003] Commutation torque fluctuations generated during commutation of brushless DC motors can cause motor vibration and noise, which limits the application range of this type of motor. Taking the brushless DC motor with 120° conduction and three-phase six-state control as an example, during the commutation process of the brushless DC motor running at high speed, the off-phase current drops rapidly, while the on-pha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/10
CPCH02P6/10
Inventor 张新华
Owner 张新华
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