Five-degree-of-freedom co-excited bearing-less switched reluctance motor system and control method

Abstract

The invention discloses a five-degree-of-freedom co-excited bearing-less switched reluctance motor system and a control method. The system is composed of a switch reluctance motor, a hybrid magnetic bearing and a radial magnetic bearing, wherein bias windings of the two bearings and an m-phase armature winding of the switch reluctance motor share the same set of power converter; with the adoptionof a co-excited manner, biased magnetic flux is generated in the two bearings when torque is generated in the switch reluctance motor; the m-phase armature winding adopts the traditional switch reluctance drive mode; and the current of the bias winding is only related to working conditions of the switch reluctance motor, and no control is performed. In addition, current of five suspending windingsis reasonably controlled by combining with the current of the bias winding collected in real time, so that five-degree-of-freedom suspension operation can be realized. According to the system disclosed by the invention, suspension force is decoupled, the suspension force and the torque are also decoupled, the control variable is less, the suspension control is simple, the integration level is high, the reliability is high, no permanent magnet exists in the system, the environmental suitability is high, and the system has unique advantages in high-speed or ultra-high-speed application occasions.

Description

technical field [0001] The invention relates to a five-degree-of-freedom co-excitation magnetic levitation switched reluctance motor system and a control method, belonging to the technical field of electric motor magnetic levitation switched reluctance motors and their control. Background technique [0002] The five-degree-of-freedom magnetic levitation switched reluctance motor system is usually composed of a switched reluctance motor, a three-degree-of-freedom hybrid magnetic bearing and a two-degree-of-freedom radial magnetic bearing, which effectively solves the problem of bearing support for high-speed motors, and further provides the switching magnetic Resistance motors have laid the foundation for high-speed or ultra-high-speed applications such as aerospace, flywheel energy storage, high-speed centrifuges, high-speed blowers, and spindle motors. [0003] Because the electromagnetic bearing adopts the electric excitation method, the design capacity is larger and the l...

AI Technical Summary

Problems solved by technology

However, the electric excitation method used in the electromagnetic bearing has many control variables, the number of power system branches increases accordingly, the failure rate of the power system also increases, and the power density is low; moreover, the traditional magnetic levitation switch reluctance The switched reluctance motor and the magnetic bearing in the motor system are independent of each other, the integration level is not high, the power system is huge, and the cost is high

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