A composite rotor structure bearingless switched reluctance motor

Abstract

The invention relates to a bearingless switched reluctance motor with a composite rotor structure and belongs to the field of magnetic levitation switched reluctance motors of motors, a set of windings are wound on stator teeth of a stator; rotors consist of a torque rotor and a levitation force rotor; the torque rotor and the levitation force rotor are arranged in the stator in an axial superposition manner; the torque rotor is used for generating the torque; the levitation force rotor is used for generating a levitation force and part of torque. According to the bearingless switched reluctance motor provided by the invention, only one winding is wound on the stator teeth; and compared with the traditional dual-winding bearingless switched reluctance motor, the bearingless switched reluctance motor disclosed by the invention has the advantages that the structure is simple, the coil space factor is high, copper and silicon steel sheets are saved and the manufacturing cost of a motor can be reduced. In the structure, the levitation force and the torque are decoupled, a control method is simple and the levitation performance of the motor is good. The levitation control is realized by using a smallest inductance zone; the influence of levitation current on torque current is small; and the alternate coupling action is small. In addition, the bearingless switched reluctance motor has the characteristics of high utilization rate of the winding, high power density and strong high-speed adaptability.

Description

technical field [0001] The invention relates to a bearingless switched reluctance motor with a compound rotor structure, which belongs to the field of magnetic levitation switched reluctance motors of motors. Background technique [0002] The bearingless switched reluctance motor is a new type of magnetic levitation motor developed at the end of the 20th century. The double-winding bearingless switched reluctance motor is to stack the levitation winding that generates the levitation force and the winding of the original ordinary switched reluctance motor on the stator of the motor. By controlling the current of the two sets of windings, it has the ability to rotate and self-levitate at the same time So as to realize the ultra-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 controlling the current of a set of windings. The single-winding bearingless switched reluctance...

AI Technical Summary

Problems solved by technology

[0003] Regardless of the double-winding bearingless switched reluctance motor or the single-winding bearingless switched reluctance motor, there is a strong coupling between the torque and the levitation force, and it is difficult to achieve complete decoupling of the two in the control strategy and mathematical model. It is one of the main factors that make it difficult to improve the running performance of the bearingless switched reluctance motor

In addition, due to the suspension force control, the winding current must be controlled by chopping. When running at high speed, the surge of back electromotive force makes it impossible to control the winding current by tracking and chopping, that is, the current cannot be chopped. It affects the high-speed performance of the bearingless switched reluctance motor

[0004] In order to solve the above two shortcomings of the bearingless switched reluctance motor, and based on the perspective of reducing the cost of the motor system, simplifying the control system, and improving and optimizing the performance of the suspension force, Korean scholars proposed two-phase motors with 8 / 10 and 12 / 14 structures. The bearingless switched reluctance motor is characterized in that the levitation force and torque are separately generated by the levitation winding and the torque winding respectively, the motor is a two-phase working system, and the power density of the motor is low

Images