Device and method for shortening commutation time of brushless DC motor

Abstract

The invention discloses a device and a method for shortening the phase changing time of a brushless direct current motor. The device comprises a direct current voltage source, a triphase full bridge inverter and a thyristor circuit, wherein the direct current voltage source supplies power for the triphase full bridge inverter, and the triphase full bridge inverter controls the brushless direct current motor through the thyristor circuit. The method is as follows: each phase of the triphase full bridge inverter is correspondingly connected with each branch of the thyristor circuit; when the phase is changed, the disconnection and the connection of the triple bridge of the triphase full bridge inverter and the corresponding branch of the thyristor circuit are controlled simultaneously; the required disconnection phase of the brushless direct current motor is disconnected through the branch in the thyristor circuit, the phase required to be disconnected cannot form a continuous current channel, so that the current of the connected channel cannot be distributed; and the current of the phase required to be disconnected is reduced to zero, the current of the phase required to be connected is increased to be equal to the current of the connected phase, and accordingly, the time for changing the phases is shortened. Hardware is low in cost, the original operation control mode of the motor does not need to be changed, and the software is simple to realize.

Description

technical field [0001] The invention relates to a device and method for shortening the commutation time of a brushless direct current motor, which is suitable for the technical field of electric drive control. Background technique [0002] Brushless DC motors have many advantages such as simple structure, high power density, and simple control. In recent years, brushless DC motors have been increasingly widely used in industrial fields such as high-performance speed regulation systems and servo control systems. [0003] Commutation torque pulse is a prominent problem of brushless DC motors, which restricts its application in speed regulation systems requiring low ripple speed and high-precision position servo control systems. In addition, commutation torque ripple is also one of the causes of motor rotation noise. From the perspective of commutation duration, the shorter the commutation time, the larger the current change rate and the smaller the commutation torque ripple....

AI Technical Summary

Problems solved by technology

Moreover, during the operation of the brushless DC motor without a position sensor, the commutation torque ripple will also affect the detection of the rotor position signal

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