Brushless DC motor control method

A technology of brushed DC motor and control method, which is applied in the direction of single motor speed/torque control, torque ripple control, etc., can solve the problems of aggravated EMI, commutation torque ripple, fast dynamic response speed, etc., and achieve faster dynamic Response speed, suppress commutation torque ripple, and reduce the effect of current change rate

Active Publication Date: 2014-11-19
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

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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 present invention discloses a brushless DC motor method belonging to the electric power transmission technology field. According to the present invention, a preceding stage four-output level power converter and a next-stage two-level three-phase full bridge inverter are in cascade connection to be used as a power supply topology of the brushless DC motor, and an instantaneous current is used as a control variable. By switching the output levels of the preceding stage four-output level power converter continuously to control the instantaneous current to always track a reference value, and the commutation of the brushless DC motor is carried out by the on-off state of the next-stage two-level three-phase full bridge inverter. According to the method, a current harmonic wave generated by the PWM control can be reduced under a lower switching frequency, the dynamic response speed is improved, and the commutation torque ripple can be restrained effectively.

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