A Control Method for Improving the Commutation Accuracy of Brushless DC Motor

A brushed DC motor and control method technology, applied in electronic commutation motor control, control system, torque ripple control and other directions, can solve the problem of motor lead or lag commutation

A brushed DC motor and control method technology, applied in electronic commutation motor control, control system, torque ripple control and other directions, can solve the problem of motor lead or lag commutation

CN110299876BActive Publication Date: 2020-10-27NORTHWESTERN POLYTECHNICAL UNIV
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  • A Control Method for Improving the Commutation Accuracy of Brushless DC Motor
  • A Control Method for Improving the Commutation Accuracy of Brushless DC Motor
  • A Control Method for Improving the Commutation Accuracy of Brushless DC Motor

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0018] A control method for improving the commutation accuracy of a brushless DC motor without a position sensor. By sampling the terminal voltage of the motor to the ground, sending it to a DSP for judgment, and obtaining a commutation signal; in order to improve the commutation accuracy, Take the following steps:

[0019] (1) Reasonably select the DSP sampling method, make the PWM counting mode of the DSP as the increasing and decreasing counting mode, and select AD sampling when the counter is 0, avoiding the PWM switching action time; read the terminal voltage of the motor of the AD port to the ground signal U a , U b , U c , after the conversion formula E a =U a +(U a +U b +U c ) / 3, E b =U b +(U a +U b +U c ) / 3, E c =U c +(U a +U b +U c ) / 3 , get the actual three-phase terminal voltage signal E of the brushless DC motor a , E ...

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Abstract

The invention provides a control method for improving the commutation accuracy of brushless DC motors. The difference in the number of interrupts between two conduction sections is taken as a feedbackvalue of the input end of a PI controller, and PI control is carried out to make the difference in the number of interrupts follow a reference value. The compensation angle obtained through PI control on the difference in the number of interrupts changes according to the actual commutation state. Whether the current motor commutation is ahead or lags behind is determined according to the symmetryof the slopes on the two sides of the trapezoidal terminal voltage wave, and then, the phase compensation is adjusted, so as to improve the accuracy of commutation. On the basis of the original sensorless brushless DC motor control system, the cycles maintained on each of the two sides of the trapezoid wave of each phase of counter electromotive force are counted, and phase compensation is carried out according to the difference in the number of count points between the two sides. The control method does not need an additional hardware circuit, is simple, and can improve the accuracy of commutation, reduce the waveform distortion rate of the voltage and current of the motor and reduce the torque ripple.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a control method for improving the commutation accuracy of the motor. Background technique [0002] As a high-efficiency and high-performance motor system, the brushless DC motor has more and more applications. As one of the important components of the brushless DC motor, the position sensor plays an important role in maintaining the continuous operation of the motor, but it also brings many problems. For example, the volume of the motor is increased, the external leads are increased, the manufacturing cost of the motor is increased, the reliability of the motor is reduced, and the rotor position sensor is easily affected by changes in environmental factors, requiring a higher installation process. It is precisely because of the above-mentioned defects of the rotor position sensor that there are certain risks in the application of the brushless DC motor in a relatively harsh environ...

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Application Information

Patent Timeline
27 Oct 2020
Publication
CN110299876B
IPC
H02P6/182; H02P6/10
CPC
H02P6/10; H02P6/182
Inventors
吴旋律; 张欣玥