A bearingless switched reluctance motor and its control method

Abstract

The invention provides a bearingless switched reluctance motor and a control method thereof. The difference between a rotor pole arc angle and a stator pole arc angle of the motor is 15 degrees, current of torque windings and suspension windings are controlled to generate suspension force, the current of the torque windings is controlled so as to generate torque, and current of the torque winding of each phase and turn-on and turn-off angle of the torque winding are regulated to achieve a speed closed loop; radial displacement of a rotor is detection, and radial force needed for rotor suspension is outputted via PID (proportion integration differentiation) regulators, so that closed-loop control of radial displacement of the rotor is achieved. The suspension windings are only excited and conducted in a maximum-inductance flat-top area and do not generate torque, so that the torque and the suspension force can be decoupled in control, and current magnitude of the torque windings and the suspension windings is optimized to make copper loss of the windings to be minimum; in addition, counter potential of the suspension windings and the torque windings is zero in the maximum-inductance flat-top area, and high-speed suspended running of the bearingless switched reluctance motor is benefitted so as to give full play to high-speed adaptability of the switched reluctance motor.

Description

technical field [0001] The invention belongs to the technical field of automatic control, in particular to a bearingless switched reluctance motor and a control method thereof. Background technique [0002] Bearingless switched reluctance motors are divided into double-winding structure and single-winding structure. The double-winding bearingless switched reluctance motor is to stack the levitation winding that generates the levitation force and the winding of the switched reluctance motor on the stator of the motor. By controlling the current of the two sets of windings, the motor can simultaneously rotate and self-levitate, thereby realizing High-speed operation of the motor. The single-winding bearingless switched reluctance motor has the ability to rotate and self-suspend at the same time by independently controlling the current of each set of windings. [0003] There is a complex coupling relationship between torque and levitation force, and it is difficult to realize...

AI Technical Summary

Problems solved by technology

[0003] There is a complex coupling relationship between torque and levitation force, and it is difficult to realize the complete decoupling of the two in the control strategy and mathematical model, which is an important factor restricting the improvement of the levitation and operation performance of the bearingless switched reluctance motor

In addition, when the levitation force is controlled, it is necessary to control the winding current by chopping, and when running at high speed, the surge of the counter electromotive force makes it impossible to track and control the winding current, that is, the current cannot be chopped, which seriously affects the Exerting High Speed ​​Performance of Bearing Switched Reluctance Motor

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