Five-degree-of-freedom magnetic suspension switched reluctance motor system and control method thereof

Abstract

The invention discloses a five-degree-of-freedom magnetic suspension switched reluctance motor system and a control method thereof. The system comprises a switched reluctance motor, two radial magnetic bearings and two conical magnetic bearings, wherein one of the two radial magnetic bearings and one of the two conical magnetic bearings are arranged at one side of the switched reluctance motor, the other radial magnetic bearing and the other conical magnetic bearing are arranged at the other side of the switched reluctance motor, bias windings of the four magnetic bearings are connected in series to form a set of bias winding, four diodes are connected in series to a DC bus of an armature winding power circuit of the switched reluctance motor, the rotation control is same as a control mode of a traditional switched reluctance motor, suspension forces in five directions are only relevant to a bias current and a current of a suspension winding in each direction and are decoupled to one another, moreover, the current of the bias winding is only relevant to a current of a three-phase armature, no independent control is performed, and torques and the suspension forces can be controlled in a decoupling way. The motor system is high in integration, simple in winding structure, low in control variable and simple in suspension control, and a power converter is low in cost.

Description

technical field [0001] The invention relates to a five-degree-of-freedom magnetic levitation switched reluctance motor system and a control method thereof, and belongs to the technical field of magnetic levitation switched reluctance motors and control thereof. Background technique [0002] The magnetic levitation switched reluctance motor not only has the advantages of no friction and no lubrication of the magnetic bearing, but also inherits the high-speed adaptability of the switched reluctance motor and meets the harsh working environment. It has unique characteristics in aerospace, flywheel energy storage and military applications. Advantage. [0003] The magnetic levitation switched reluctance motor is usually composed of a five-degree-of-freedom magnetic bearing and a switched reluctance motor. The traditional permanent magnet bias magnetic bearing requires a large thrust plate, which will cause large eddy current loss and temperature rise; while the traditional cone ...

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Problems solved by technology

[0003] The magnetic levitation switched reluctance motor is usually composed of a five-degree-of-freedom magnetic bearing and a switched reluctance motor. The traditional permanent magnet bias magnetic bearing requires a large thrust plate, which will cause large eddy current loss and temperature rise; while the traditional cone The shape electric excitation magnetic bearing has more control objects, and the axial suspension force is related to the square of the control winding current, which is not conducive to the simplification and reliability of the system

There is a strong coupling between the suspension forces, which also increases the difficulty of the control of the suspension system, and the accuracy of the suspension control is also reduced.

[0004] In addition, the motor and the magnetic bearing control system in the traditional magnetic levitation switched reluctance motor system are independent, and the integration degree is not high

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