Three Levitation Pole Magnetic Suspension Sheet Switching Reluctance Motor

Abstract

The invention relates to the technical field of magnetic levitation sheet switched reluctance motors, and discloses a three-levitation pole magnetic levitation sheet switched reluctance motor, which includes a stator and a rotor. The stator includes a motor stator core, a magnetic bridge, and a permanent magnet ring; Three stator suspension teeth and three stator torque teeth are distributed at weekly intervals; the stator torque teeth are connected to the stator core of the motor through a magnetic isolation aluminum block; the stator torque teeth are three inverted "U" shaped structures distributed along the axial direction; The two ends of the magnetic bridge are connected to the stator core through permanent magnetic rings, and the middle part of the magnetic bridge is a magnetic collecting ring that protrudes inward and extends into the rotor; rotor teeth are evenly distributed on the outside of the rotor, forming an outer air gap with the stator core of the motor. An inner air gap is formed between the magnet rings. The invention only needs a three-phase inverter to realize the stable suspension of the two degrees of freedom of the rotor, the torque magnetic flux path is separated from the suspension magnetic flux path, the torque and the suspension force are naturally decoupled, and the suspension force density is large. Low cost and power consumption, simple control and other advantages.

Description

technical field [0001] The invention relates to the technical field of magnetic levitation sheet switched reluctance motors, in particular to a three levitation pole magnetic levitation sheet switched reluctance motor. Background technique [0002] There are no permanent magnets and windings on the rotor of the magnetic levitation switched reluctance motor. It has the advantages of no friction and wear, simple structure, firmness, and high strength. It is easy to achieve high-speed operation and has great application prospects in high-speed applications. [0003] In order to realize the stable levitation operation of the rotor of the magnetic levitation switched reluctance motor, it is necessary to use a two-degree-of-freedom magnetic levitation switched reluctance motor, a radial two-degree-of-freedom magnetic bearing, an axial single-degree-of-freedom magnetic bearing or a radial-axial three-degree-of-freedom magnetic levitation bearing. The five-degree-of-freedom magnetic...

AI Technical Summary

Problems solved by technology

[0003] In order to realize the stable levitation operation of the rotor of the magnetic levitation switched reluctance motor, it is necessary to use a two-degree-of-freedom magnetic levitation switched reluctance motor, a radial two-degree-of-freedom magnetic bearing, an axial single-degree-of-freedom magnetic bearing or a radial-axial three-degree-of-freedom magnetic levitation bearing. The five-degree-of-freedom magnetic levitation switched reluctance motor system leads to a long axial length of the system, low critical speed, low levitation force density and power density, and strong coupling between levitation force and torque, which makes the control complex and difficult to miniaturize. Industrial applications in the field of liquid transfer

There are two sets of windings on each tooth of the traditional bearingless switched reluctance motor, and the magnetic fields generated by the two sets of windings work together to generate levitation force and torque, which makes the levitation magnetic field and torque magnetic field coupled seriously, and the control is complicated

In addition, the traditional bearingless switched reluctance motor has no permanent magnets and cannot achieve a thin design, which also limits its application in the field of liquid transmission such as hermetic pumps

Chinese invention patent: a permanent magnet bias bearingless switched reluctance motor (CN102306995A), the stator and rotor poles are 12 / 14, the stator has 4 levitation poles and 8 torque poles, and the number of rotor teeth is 14, realizing torque It is naturally decoupled from the levitation force, but the magnetic levitation switched reluctance motor with this structure needs two switching power amplifiers to realize the stable levitation of the rotor with two degrees of freedom, and the number of poles in the radial circle is large and the pole area is small, resulting in small levitation force. It is difficult to reflect its excellent performance

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