Two-degree-of-freedom dual-winding hybrid magnetic bearing switched reluctance motor and control method thereof

Abstract

The invention discloses a two-degree-of-freedom dual-winding 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 comprises a 12 / 8-pole switched reluctance motor and a 12-pole magnetic bearing, wherein a suspension winding and a bias winding are wound around each of four stators of the magnetic bearing, all bias windings are connected and then are connected in series with an A-phase winding of the reluctance motor to form an A-phase composite excitation winding, a constant conduction excitation mode is employed, bias magnetic flux is generated in the magnetic bearing, and meanwhile, a torque is generated in the reluctance motor; a B phase and a C phase employ modes of excitation in turns, and the A phase employs asymmetric excitation in a positive and negative half period to generate an effective torque; and the A phase provides the bias magnetic flux by control and also generates an average torque equal to those of the other two phases, and the average output torques output from the three phases are symmetric. By the motor and the control method, the magnetic bearing and the reluctance motor are isolated, no coupling is generated between magnetic paths, the torques and the suspension forces are decoupled, and a power system is low in cost and is simple to control.

Description

technical field [0001] The invention relates to a two-degree-of-freedom double-winding hybrid magnetic bearing switched reluctance motor and a control method thereof, belonging to the technical field of magnetic levitation switched reluctance motors and control thereof. 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 an...

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Problems solved by technology

[0004] In addition, the power converter system of the traditional bearingless switched reluctance motor is complicated. For the double-winding structure, two sets of power converters are required for the main winding and the suspension winding. For the single-winding structure, each winding needs to be controlled independently. That is, each winding requires a power converter, so the cost of the power converter of the two structures is higher, and it is more difficult to control accurately. The existence of these problems seriously limits the application of the bearingless switched reluctance motor

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