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Direct-current brushless motor control method

A brushless DC, motor technology, applied in the direction of torque ripple control, starting devices, etc., can solve the problems of large torque ripple, many sensors, complex parameter adjustment, etc., achieve rapid shutdown and reverse rotation, and reduce torque ripple , The effect of suppressing torque ripple during commutation

Inactive Publication Date: 2014-08-13
STATE GRID CORP OF CHINA +1
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 1. The traditional brushless DC motor control strategy has a large torque ripple during commutation, which limits the wide application of brushless DC motors
[0011] 2. The traditional PI control requires more sensors, and the parameter adjustment is more complicated

Method used

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0035] Such as figure 1 As shown, the core of the DC brushless motor control system is the inverter. The whole circuit is powered by DC, and the inverter, the core device of the control system, is generally controlled by six power transistors (T1~T6), of which the upper bridge arms are T1, T3, T5, and the lower bridge arms are T2, T4, T6. The inverter is a switch that controls the flow of current to the motor coils. The core of the inverter is the control strategy, which generates a pulse width modulation signal to control the frequency of switching on and off of the transistor and the time of forward and reverse rotation.

[0036] At present, there are generally five main modulation methods of brushless DC motors, namely PWM-ON type, ON-PWM type, H_PWM-L_ON type, H_ON-L_PWM type, and H_PWM-L_PWM type. Such as Figure 2-6 .

[0037] ⑴PWM-ON type: I...

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Abstract

The invention discloses a direct-current brushless motor control method. An adopted control system is characterized in that an upper switching tube and a lower switching tube on a bridge arm in one phase are controlled to be turned on in a complementary mode in an on interval of 120 degrees for a three-phase inverter and lower bridge arms of the other two phases are alternately constantly turned on for 60 degrees, namely in the interval of 0-60 degrees, T1 and T4 are turned on in the complementary mode, and T6 is turned on constantly; in the interval of 60-120 degrees, T1 and T4 are turned on in the complementary mode, and T2 is constantly turned on; in the interval of 120-180 degrees, T3 and T6 are turned on in the complementary mode, and T2 is constantly turned on; in the interval of 180-240 degrees, T3 and T6 are turned on in the complementary mode, and T4 is constantly turned on; in the interval of 240-300 degrees, T2 and T5 are turned on in the complementary mode, and T4 is constantly turned on; in the interval of 300-360 degrees, T2 and T5 are turned on in the complementary mode, and T6 is constantly turned on.

Description

technical field [0001] The invention relates to a control method of a DC brushless motor. Background technique [0002] At present, there are generally five main modulation methods of brushless DC motors, namely PWM-ON type, ON-PWM type, H_PWM-L_ON type, H_ON-L_PWM type, and H_PWM-L_PWM type. The control methods are as follows: [0003] ⑴PWM-ON type: In the 120° conduction interval, the first 60° of each switch tube adopts PWM modulation, and the last 60° is constant; [0004] ⑵ON-PWM type: In the 120° conduction interval, the front 60° of each switch tube is constant, and the rear 60° adopts PWM modulation; [0005] (3) H_PWM-L_ON type: In the 120° conduction interval, the switch tube of the upper bridge arm adopts PWM modulation, and the lower bridge arm is constant; [0006] ⑷H_ON-L_PWM type: In the respective 120° conduction intervals, the upper bridge arm switch tube is constant, and the lower bridge arm adopts PWM modulation; [0007] ⑸H_PWM-L_PWM type: In the 120° ...

Claims

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Application Information

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IPC IPC(8): H02P6/10H02P6/22
Inventor 吴奎华王建杨波吴健王浩孙伟张晓磊郑志杰杨慎全王轶群梁荣贾善杰
Owner STATE GRID CORP OF CHINA
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