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Shutdown phase control method in commutation process of brushless DC motor

A brushless DC motor and control method technology, which is applied to the phase-off control during the commutation process of the brushless DC motor, in the field of brushless DC motor control. and other problems to achieve the effect of weakening the low-speed commutation torque ripple

Inactive Publication Date: 2018-11-23
魏传月
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Up to now, there are very few technical researches on controlling the shut-off phase 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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  • Shutdown phase control method in commutation process of brushless DC motor

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Embodiment Construction

[0016] The technical solutions and beneficial effects of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0017] Such as figure 1 As shown, the present invention provides a method for controlling the off-phase in the commutation process of a brushless DC motor, which includes the following steps:

[0018] Step 1. Determine the non-commutated phase, the shut-off phase and the shut-off power tube in the three-phase full-bridge inverter in the commutation process of the brushless DC motor;

[0019] Step 2. Record the non-commutated phase current Ia before commutation;

[0020] Step 3. Record the non-commutated phase current Ib during the commutation process;

[0021] Step 4. Judging whether |Ia-Ib| is greater than 0.05|Ia| during the commutation process;

[0022] Step 5. If |Ia-Ib| is greater than 0.05|Ia|, turn on the power tube in the same bridge arm as the off power tube in the three-phase full-bridge inverter;

[002...

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Abstract

The invention discloses a shutdown phase control method in a commutation process of a brushless DC motor, the control method comprises the following steps: determining a shutdown power tube of a non-commutated phase, a shutdown phase and a three-phase full-bridge inverter in the commutation process of a brushless DC motor; recording the non-commutation phase current Ia before commutation; recording the non-commutation phase current Ib during the commutation process; if the absolute value of Ia minus Ib in the commutation process is greater than 5% of the absolute value of Ia, then open a powertube that has the same arm as the shutdown power tube in the three-phase full-bridge inverter ; If the absolute value of Ia minus Ib in the commutation process is not more than 5% of the absolute value of Ia, turn off the power tube that has the same arm as the shutdown power tube in the three-phase full-bridge inverter to achieve the purpose of weakening the low-speed commutation and torque ripple of the brushless DC motor.

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 control method for a shut-off phase in the phase commutation process 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] 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 too small. Du...

Claims

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Application Information

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IPC IPC(8): H02P6/10
CPCH02P6/10
Inventor 魏传月
Owner 魏传月
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