A Bearingless Switched Reluctance Motor

Abstract

The invention discloses a switch reluctance motor without bearings. The number of teeth of a suspension stator of the reluctance motor is four, the number of teeth of a torque stator is four times of a phase number m, the number of teeth of a rotor is integral times of four, four suspension stator teeth stretch out of a stator yoke of the rotor, then the phase number m teeth of the torque stator stretch out of each tooth of the suspension stator again, a torque winding winds on each tooth of the torque stator, a suspension winding winds on each tooth of the suspension stator, currents of the torque windings and the suspension windings are controlled respectively, and suspension force and torque are produced at the same time. According to the switch reluctance motor without the bearings, only one winding is arranged on the teeth of the torque stator and the teeth of the suspension stator respectively, relative to a traditional duplex winding switch reluctance motor without the bearings, the torque is not contacted with the suspension windings, a groove full rate is high, a utilization rate of the windings is high, the suspension force and torque force are completely decoupled structurally, a control method is simple, suspension performance of the motor is good, systematic cost is low, and high-speed adaptability is strong.

Description

Technical field [0001] The invention belongs to the technical field of motors, and relates to a bearingless switched reluctance motor. Background technique [0002] Bearingless switched reluctance motor is a new type of magnetic levitation motor developed at the end of the 20th century. The dual-winding bearingless switched reluctance motor is the suspension winding that generates the suspension force and the winding of the original switched reluctance motor are stacked together on the stator of the motor, and the two sets of winding currents are controlled to have both rotation and self-suspension capabilities, thereby Realize ultra-high-speed operation of the motor. The single-winding bearingless switched reluctance motor controls a set of winding currents so that it has both rotation and self-suspension capabilities. [0003] Regardless of the dual-winding bearingless switched reluctance motor or the single-winding bearingless switched reluctance motor, there is a strong coupl...

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 suspension and 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 bearingless switched reluctance motors, Korean scholars proposed two-phase bearingless switched reluctance motors with 8 / 10 and 12 / 14 structures, which are characterized in that the suspension force and torque are respectively controlled by the suspension winding and the rotor The torque winding is generated separately, the motor is a two-phase working system, and the power density of the motor is low; the High-speed Motor Teaching and Research Office of Nanjing University of Aeronautics and Astronautics proposed a series-excited bearingless switched reluctance motor, which connects three-phase suspension windings in the same direction in series. Set the winding, so that the magnetic permeability of the suspension winding is constant in a rotor cycle, and the suspension current does not generate torque, which realizes the decoupling of the torque and suspension force structure. Low

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