Hybrid magnetic bearing switched reluctance motor and control method thereof

Abstract

The invention discloses a hybrid magnetic bearing switched reluctance motor and a control method thereof, and belongs to the field of a magnetic suspension motor and control thereof. The motor is formed by connecting and integrating a 12-8-pole switched reluctance motor and a 4-pole magnetic bearing in series, wherein four suspension windings are wound around magnetic bearing stators and four reluctance motor stators which are aligned to the magnetic bearing stators, and are used for generating suspension forces, eight armature windings are wound around the other eight reluctance motor stators and are used for generating torques, during control, the suspension windings employ constant conduction excitation, suspension forces are simultaneously generated in the magnetic bearing and the reluctance motor, eight torque windings are connected to form two phases, excitation conduction is performed in turns, and torques are generated in the reluctance motor. According to the control method of the motor, the currents of the suspension windings are symmetric in each positive and negative half period, a positive torque and a negative torque which are generated are equal, the average torque is zero, and thus, the suspension forces and the average torque are decoupled; moreover, the starting performance of the motor is also improved by the positive torque, and the defect of difficulty in starting of a traditional two-phase motor can be overcome; and the hybrid magnetic bearing switched reluctance motor is simple in structure, and a power system is low in cost and is simple to control.

Description

technical field [0001] The invention relates to a hybrid magnetic bearing switched reluctance motor and a control method thereof, and belongs to the technical field of magnetic levitation switched reluctance motors and their control. Background technique [0002] The bearingless switched reluctance motor is a new type of magnetic levitation motor developed in the 1990s. Since the bearingless switched reluctance motor integrates the functions of rotation and suspension, it can not only effectively solve the problems of loss and heat caused by bearing friction during high-speed operation, but also further exert the high-speed adaptability of the switched reluctance motor, thereby strengthening its Application base in high-speed fields such as aerospace, flywheel energy storage, and ships. [0003] With the continuous deepening of research, people gradually realize that whether the constraints between the effective output areas of torque and suspension force can be solved, whe...

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Problems solved by technology

[0005] However, since the magnetic bearing and the switched reluctance motor share the same stator, there is a strong magnetic coupling between the two-phase armature winding and the four suspension windings, and the mathematical model of the suspension force is complex; in addition, the four suspension windings are equivalent to the traditional 8 / 6 The other two phases of the pole switched reluctance motor, and the direction of the generated torque is always opposite, the torque ripple is large, which limits the starting performance. The starting ability of this motor is similar to that of the traditional two-phase motor, and there is a starting dead zone; limited by its structure , the motor cannot achieve decoupling control of torque and suspension force, and it is difficult to accurately control high-speed suspension

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