A wide rotor tooth bearingless switched reluctance motor power converter and control method

Abstract

The invention discloses a wide rotor tooth bearingless switched reluctance motor power converter and its control method. The power converter includes a power supply voltage V DC , voltage stabilizing capacitor C L , boost capacitor C H and several bridge arm circuits; the bridge arm circuits include switching tubes and diodes; the number of the bridge arm circuits is the same as the number of motor stators, and each stator of the motor is connected to the bridge arm circuits; , each winding can be independently switched and operated under different working modes; the wide rotor tooth bearingless switched reluctance motor power converter provided by the present invention realizes the rapid excitation of the motor windings, and can effectively improve the operating performance of the motor; Compared with the flat power converter, each phase of the present invention can operate independently, while improving the motor torque problem, it will not affect the stable suspension of the motor, and the cost is controlled to a certain extent.

Description

technical field [0001] The invention relates to the technical field of motor control applications, and mainly relates to a wide rotor tooth bearingless switched reluctance motor power converter and a control method. Background technique [0002] Wide rotor tooth bearingless switched reluctance motor (Bearingless Switched Reluctance Motor with Wider Rotor Teeth, BSRMWR) has the characteristics of simple structure, firmness, low cost, reliable operation, no lubrication, long life, etc. Flywheel energy storage and other fields have important applications. Compared with ordinary bearingless switched reluctance motors, the mechanical angle of BSRMWR rotor teeth is increased to 30°, and the two-phase conduction method is adopted to realize the natural decoupling of torque and suspension force, which greatly simplifies the control algorithm. [0003] Since the bearingless switched reluctance motor generally uses an asymmetrical half-bridge power converter, during the commutation p...

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Problems solved by technology

[0003] Since the bearingless switched reluctance motor generally uses an asymmetrical half-bridge power converter, during the commutation period of the motor, after the phase current of the previous phase is cut off, the phase current of the subsequent phase is still in the established state, which may easily cause current tracking failure. The above problems make the torque ripple of the motor larger during commutation

If the traditional four-level power converter is used, although the excitation current can be established quickly, the number of switching tubes required for each phase is too large, which will greatly increase the cost of the power converter; at the same time, each of the traditional four-level power converters The phases cannot be independently controlled, and the motor cannot be guaranteed to float stably while rotating

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