A method for controlling a brushless DC motor

A brushed DC motor and control method technology, applied in the direction of a single motor speed/torque control, torque ripple control, etc., can solve the problems of commutation torque ripple, aggravated EMI problems, fast dynamic response speed, etc. The effect of torque ripple, faster dynamic response, and lower current change rate

Active Publication Date: 2016-11-30
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0003] 1. Since the electromagnetic time constant of the brushless DC motor is usually very small, when the switching frequency is low, the current harmonics caused by PWM chopping are relatively large, which aggravates the heating of the motor
Increasing the switching frequency will increase the loss and reduce the efficiency, and will aggravate the EMI problem;
[0004] 2. The brushless DC motor has the inherent defect of commutation torque ripple, which limits its application in high-precision occasions
When the motor is running at high speed, the commutation torque ripple is more serious;
[0005] 3. In the traditional control method, limited by the DC power supply voltage and the electromagnetic time constant, it is impossible to obtain a faster dynamic response speed

Method used

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  • A method for controlling a brushless DC motor
  • A method for controlling a brushless DC motor
  • A method for controlling a brushless DC motor

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Embodiment Construction

[0034] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0035] Such as figure 1 As shown, the present invention discloses a brushless DC motor control method, including a four-output level power converter, a two-level three-phase full-bridge inverter, a brushless DC motor body, a speed error calculation module, and a speed loop PI The specific steps of the adjustment module, the current sampling module, the current error calculation module and the level selection table are as follows:

[0036] Step 1), obtain six discrete Hall position signals through the Hall position sensor of the brushless DC motor body, obtain a commutation table according to the six discrete Hall position signals, and use this to control the two-level three-phase A full-bridge inverter realizes the commutation of the brushless DC motor body;

[0037] Step 2), use the six discrete Hall position signals to calculate the sampling va...

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Abstract

The invention discloses a method for a brushless direct current motor, which belongs to the technical field of electric power transmission. In the present invention, a front-stage four-output level power converter is cascaded with a rear-stage two-level three-phase full-bridge inverter as a power supply topology for a brushless DC motor, and instantaneous current is used as a control variable. The instantaneous current is controlled to always track the reference value by constantly switching the output level of the front-stage four-output-level power converter, and the commutation of the brushless DC motor is performed through the switch state of the rear-stage three-phase full-bridge inverter. The method can reduce the current harmonic generated by PWM control, improve the dynamic response speed and effectively suppress the commutation torque ripple at a lower switching frequency.

Description

technical field [0001] The invention relates to the technical field of electric power transmission, in particular to a control method of a brushless DC motor. Background technique [0002] In recent years, brushless DC motors have been used more and more widely because of their advantages such as high power density and simple control. The traditional brushless DC motor control system is powered by a three-phase full-bridge inverter, and realizes the speed regulation function through PWM chopper control of the three-phase full-bridge inverter. However, the control effect of brushless DC motors has been poor, mainly for the following three reasons: [0003] 1. Since the electromagnetic time constant of the brushless DC motor is usually very small, when the switching frequency is low, the current harmonics caused by PWM chopping are relatively large, which aggravates the heating of the motor. Increasing the switching frequency will increase the loss and reduce the efficiency,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/08H02P6/10
Inventor 顾聪王晓琳
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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