Wide speed range and low torque ripple suppression method for bearingless brushless DC motor used for flywheel energy storage

Abstract

The invention relates to a bearingless brushless DC motor wide speed regulation range low torque ripple suppression method for flywheel energy storage, and belongs to the field of motor control. Current prediction control is added into direct torque control, and the system adopts a rotation speed and torque dual closed loop control mode, the torque control is performed at the non-commutation time,overlap commutation is performed at the commutation time, and a current prediction module is added to calculate the duty ratio. When the Hall position signal jump flag commutation starts, the turn-off phase current decreases to zero, and the flag commutation ends. During the commutation phase, the off-phase and non-commutation phase synchronous PWM modulation is adopted to turn on the phase-passing measure. Simultaneously, the non-commutation phase current value and the motor speed at the current time, that is the time k are sampled, the opposite electromotive force of the three-phase windingis obtained according to the operation state of the motor at the current time that is the time k, and finally the prediction control law D is calculated by using the current prediction control module; and the output of an inverter circuit is controlled, and the rotation of the motor is controlled.

Description

technical field [0001] The invention relates to a bearingless brushless DC motor with wide speed regulation range and low torque ripple suppression, which is suitable for high-performance control of a bearingless brushless DC motor used for a flywheel battery and belongs to the field of motor control. Background technique [0002] With the development of new energy power generation, distributed power systems, hybrid vehicles, aerospace and other fields, energy storage technology has become a worldwide research topic. Among many energy storage technologies, flywheel batteries are highly valued at home and abroad for their advantages of high power, high efficiency, long life, high energy storage density, and cleanliness. As one of the core components of the flywheel battery, the drive motor has become the focus of research. Bearingless brushless DC motors not only have the advantages of high critical speed, good speed regulation performance and simple structure of brushless D...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the commutation torque ripple suppression effect is not ideal when the direct torque control strategy of the bearingless brushless DC motor operates in the high-speed section, the present invention proposes a bearingless brushless DC motor with a wide speed regulation range and low torque ripple Inhibition method, adding current predictive control to the traditional direct torque control strategy, the purpose is to minimize the torque ripple of the motor at low, medium and high speeds

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