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A novel on-phase PWM control method for brushless DC motor

A technology of brushed DC motor and control method, which is applied in the direction of torque ripple control and electronic commutator, can solve the problems that the technology has not yet been reported, and the research on the PWM control technology of the open phase is very little, so as to weaken the low-speed commutation The effect of torque ripple

Inactive Publication Date: 2018-12-11
魏海峰
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Up to now, there are very few researches on the open-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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  • A novel on-phase PWM control method for brushless DC motor

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Embodiment Construction

[0018] The technical solutions and beneficial effects of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0019] Such as figure 1 As shown, the present invention provides a novel brushless DC motor open-phase PWM control method, comprising the following steps:

[0020] Step 1. Determine the open power tube in the three-phase full-bridge inverter during the commutation process of the brushless DC motor;

[0021] Step 2. Record the rotational speed Sa of the brushless DC motor before commutation;

[0022] Step 3. Record the rotational speed Sb of the brushless DC motor during the commutation process;

[0023] Step 4: Subtract the brushless DC motor speed Sb during the phase commutation process from the brushless DC motor speed Sa before commutation to obtain the brushless DC motor speed deviation ΔS;

[0024] Step 5: Differentiate the rotational speed deviation ΔS of the brushless DC motor to obtain ΔSw;

[0025] Step 6...

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Abstract

The invention discloses a novel on-phase PWM control method for a brushless DC motor. The control method comprises the following steps: determining a three-phase full-bridge inverter on-phase power transistor in the commutation process of the brushless DC motor; Recording the rotational speed Sa of the brushless DC motor before commutation; Recording the rotational speed Sb of the brushless DC motor in the commutation process; Subtracting the rotational speed Sb of the brushless DC motor in the commutation process from the rotational speed Sa of the brushless DC motor before commutation to obtain the rotational speed deviation DELTA S of the brushless DC motor; DELTA Sw is obtained by differentiating the speed deviation DELTA S of the brushless DC motor; Performing a PI operation on the. DELTA Sw; The result of the PI operation is limited to 0-100% range to obtain the value D; The three-phase full-bridge inverter is controlled to turn on the power transistor with D as the duty cycle for PWM modulation so as to weaken the low-speed commutation torque ripple of brushless DC motor.

Description

technical field [0001] The invention belongs to the field of brushless direct current motor control, relates to a brushless direct current motor, in particular to a novel brushless direct current motor open-phase PWM control method. 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 open phase is too large. The reason is that the brushless DC motor comm...

Claims

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Application Information

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IPC IPC(8): H02P6/10H02P6/14
CPCH02P6/10H02P6/14
Inventor 魏海峰
Owner 魏海峰
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