Single-phase magnetic-flux switching-type variable reluctance motor

Abstract

The invention discloses a single-phase magnetic-flux switching-type variable reluctance motor. The motor comprises: an excitation winding and / or an excitation permanent magnet, a magnetic flux switching salient pole unit, a salient pole stator and a salient pole rotor. The salient pole stator comprises: a magnetic flux switching salient pole unit and a stator yoke. The salient pole rotor comprises three rotor salient poles and rotor yokes which are uniformly distributed as a certain interval and angle. The excitation winding and / or the excitation permanent magnet is fixed on a stator yoke so as to form a single phase excitation source. Therefore, an excitation magnetic flux always forms a closed path through the stator yoke, the magnetic flux switching salient pole unit, an air gap and the salient pole rotor. Through a flexible adjusting effect of the magnetic flux switching salient pole unit to the closed path of the excitation magnetic flux, a motor output torque can do work externally. In the invention, a motor structure is simple. Because there is no the winding or the permanent magnet on the rotor, the motor of the invention simultaneously possesses high reliability and other advantages.

Description

technical field [0001] The invention relates to a motor, in particular to a single-phase magnetic flux path switching type variable reluctance motor, which belongs to the field of electric drive equipment. Background technique [0002] The variable reluctance motor is a new type of speed regulating motor. The speed regulating system has the advantages of both DC and AC speed regulating systems. It is the latest generation of stepless speed regulating system following the frequency conversion speed regulating system and the brushless DC motor speed regulating system. It has simple and firm structure, wide speed regulation range, excellent speed regulation performance, high efficiency in the whole speed regulation range, high system reliability, especially suitable for high-speed operation, where high-speed and variable-speed drives are required in fans and pumps. In some occasions, it can well replace the existing asynchronous motor and permanent magnet synchronous motor. ...

AI Technical Summary

Problems solved by technology

[0004] However, in order to reduce the control cost and manufacturing cost of variable reluctance motors, single-phase or two-phase variable reluctance motor structures are usually used to reduce the number of control switches used. The phase-changed reluctance motor realizes the reduction of control cost, but it has no self-starting ability due to the excessive torque dead zone, and like the common motor, the complex magnetic flux field on the stator makes the stator iron loss too high, changing the To enable the general variable reluctance motor to have self-starting capability, it is usually necessary to adopt a stator structure of more than three phases, which directly increases the cost of control, which is not conducive to application and promotion

[0005] There have been extensive studies at home and abroad on the research of flux switching motors. China's invention patent application: Electric excitation flux switching motor (patent number application number: 201010120388.0) improves its magnetic field adjustment performance by using segmented stator magnetic gathering blocks , similarly, the Chinese invention patent application: hybrid excitation permanent magnet flux switching motor (patent application number: 201010176671.5) is also built in the stator through the permanent magnet, and the permanent magnet magnetic field is switched through the electric excitation winding, so that the air gap magnetic field is a mixed magnetic field, At the same time, the air-gap magnetic field can be adjusted to achieve the purpose of increasing energy density; the above two solutions of flux switching motors reduce the iron loss of the stator, but the control cost is too high and the manufacturing is complicated, which is not conducive to large-scale application

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