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Turn-off phase control method for brushless direct current motor based on non-commutation phase current

A brush DC motor and control method technology, applied in the direction of torque ripple control, etc., can solve the problems that the technology has not yet been reported, and the off-phase PWM control technology has little research, so as to achieve the effect of weakening the low-speed commutation torque ripple

Inactive Publication Date: 2018-11-23
夏怀琴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Up to now, there are very few studies on the off-phase PWM control technology in the commutation process of brushless DC motors, and the application technology of the present invention has not yet been reported.

Method used

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  • Turn-off phase control method for brushless direct current motor based on non-commutation phase current

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Embodiment Construction

[0017] The technical solutions and beneficial effects of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0018] Such as figure 1 As shown, the present invention provides a method for controlling the shutdown phase of a brushless DC motor based on non-commutated phase current, including the following steps:

[0019] Step 1. Determine the power tube to be turned off in the three-phase full-bridge inverter during the commutation process of the brushless DC motor;

[0020] Step 2. Record the non-commutated phase current Ia before commutation;

[0021] Step 3. Record the non-commutated phase current Ib during the commutation process;

[0022] Step 4, subtracting the non-commutated phase current Ia before the commutation from the non-commutated phase current Ib during the commutation process to obtain the non-commutated phase current deviation ΔI of the brushless DC motor;

[0023] Step 5, performing PI calculation on the n...

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Abstract

The invention discloses an turn-off phase control method for a brushless direct current motor based on non-commutation phase current which comprises the following steps of: determining a turn-off power tube in a three-phase full-bridge inverter in the commutation process of the brushless direct current motor; recording the non-commutation phase current before commutation by Ia; recording the non-commutation phase current in the commutation process by Ib; subtracting the non-commutation phase current in the commutation process Ib from the non-commutation phase current before commutation Ia to obtain the non-commutation phase current deviation [delta]I of the brushless direct current motor; performing PI operation on the non-commutation phase current deviation [delta]I of the brushless direct current motor; limiting the result of PI operation to a range of 0-100% to obtain a value D; controlling the power tube which has the same bridge arm with the turn-off power tube of the three-phasefull-bridge inverter to perform PWM modulation with D as the duty cycle. According to the turn-off phase control method for the brushless direct current motor based on non-commutation phase current, the purpose of weakening the torque ripple in low-speed commutation of the brushless direct current motor is achieved.

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 shutdown phase of the brushless direct current motor based on non-commutation phase current. 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] The commutation torque pulsation generated during the commutation of the brushless DC motor 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, when the low-speed brushless DC motor commutates, the current change rate of the off-phase is to...

Claims

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Application Information

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IPC IPC(8): H02P6/10
CPCH02P6/10
Inventor 夏怀琴
Owner 夏怀琴
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