A pwm modulation method for suppressing commutation torque fluctuation of brushless dc motor
A technology of brushed DC motor and modulation method, which is applied in the direction of torque ripple control, control system, electrical components, etc., and can solve the limited effect of commutation torque ripple suppression on the dynamic characteristics of DC-DC converters and increase the cost of hardware systems Problems related to the complexity of the control system and the strategy of shortening the commutation time to achieve the effect of improving smooth running performance, shortening the commutation time, and increasing hardware costs
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[0035] Below in conjunction with accompanying drawing, the present invention will be further described:
[0036] The control schematic diagram of the whole brushless DC motor in the present invention is as follows figure 1 shown. The system consists of four parts: DC power supply, brushless DC motor, three-phase inverter bridge and controller. Among them, the DC power supply, brushless DC motor and three-phase inverter bridge are the same modules used in common brushless DC motor drive systems. The controller includes control strategies in the normal conduction stage and the commutation stage, and the control strategy in the commutation stage is divided into different control methods in the high-speed section and the low-speed section.
[0037] The three-phase stator windings of brushless DC motors are symmetrical, and each phase winding can be equivalent to a series connection of resistance, inductance and back electromotive force. The terminal voltage equation of brushles...
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