Brushless DC motor open phase delay open control method

A technology of brush DC motor and control method, which is applied in the field of brushless DC motor control and brushless DC motor turn-on phase delay turn-on control, which can solve the problems of limiting the application range of the motor, noise, motor jitter, etc., and is beneficial to low-speed commutation Effect of Torque Ripple Control

Inactive Publication Date: 2018-12-21
张新华
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  • Summary
  • 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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  • Brushless DC motor open phase delay open control method

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Embodiment Construction

[0021] The technical solutions and beneficial effects of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0022] Such as figure 1 As shown, the present invention provides a method for controlling the delayed turn-on of the turn-on phase of the brushless DC motor, which includes the following steps:

[0023] Step 1. Make the brushless DC motor run stably at low speed;

[0024] Step 2, determining the on-phase X, off-phase Y and non-commutation phase Z of the brushless DC motor during the commutation process;

[0025] Step 3: detecting the current Ia of the on-phase X during the commutation process, detecting the current Ib of the off-phase Y during the commutation process, and detecting the current Ic of the non-commutation phase Z during the commutation process ;

[0026] Step 4, recording the interval time t1 between the current Ia from the commutation start moment to the moment when the amplitude of the current Ia is...

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Abstract

The invention discloses a brushless DC motor opening phase delay opening control method, which determines the opening phase X, the closing phase Y and the non-commutating phase Z when the brushless DCmotor commutes; detecting the current Ia in the commutation process of the on-phase X, detecting the current Ib in the commutation process of the off-phase Y, and detecting the current Ic in the commutation process of the non-commutation Z; recording a time t1 from the commutation start time to a time t1 when the magnitude of the current Ia is equal to the magnitude of the current Ic; recoridingthe amplitude | Ia1 |of the current Ia when the amplitude of the current Ia is equal to the amplitude of the current Ic; dividing | Ia1 | by t1 to get Ip1; recording the magnitude of the commutation start time of the current Ib | Ib1 |; recording a time t2 from the commutation start time to the current magnitude reaching zero; divideing | Ib1 | by t2 to give Ip2; subtracting Ip2 from Ip1 to obtainthe deviation [Delta]Ip; Performing PI operation on the deviation [DELTA]Ip to obtain a delayed turn-on time Ty; At the next commutation process, controlling the on-phase X to be open again from thecommutation start time delay time Ty to control the low speed torque ripple of brushless DC motor.

Description

technical field [0001] The invention belongs to the control field of a brushless direct current motor, relates to a brushless direct current motor, in particular to a method for controlling the delayed turn-on of the turn-on phase 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, the brushless DC motor running at low speed will produce commutation torque ripple when commutating. The drop rate of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/15
CPCH02P6/15
Inventor 张新华
Owner 张新华
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