Mixed excitation short-magnetic-circuit variable-reluctance motor

Abstract

The invention discloses a mixed excitation short-magnetic-circuit variable-reluctance motor 1 as well as a stator structure and a rotor structure thereof. An inner circular face t of a base part 2 of the mixed excitation short-magnetic-circuit variable-reluctance motor is provided with modules 2-1 which protrude inwards in a preset interval angle; the stator part comprises a plurality of H-shaped stator sections 3 and first permanent magnets 4 (1) arranged at all the H-shaped stator sections p1, and the polarities of the permanent magnets of the stator sections are opposite; an exciting winding coil is embedded into two stator slots of each H-shaped stator section 3; and the rotor part comprises a rotor body 5 and a plurality of annular body rotor sections 8 arranged on the rotor body and / or second permanent magnets 4 (2), wherein the second permanent magnets are arranged on the s3 surfaces of the annular body rotor sections, and open grooves 8-1 and 8-2 are arranged on the lateral surfaces of the annular body rotor sections. According to the invention, the rotating force of the variable-reluctance motor can be increased, the energy density is improved, the torque ripple and the vibration and noise level are reduced, the performance is stable, and the size is smaller under the requirement of same output torque.

Description

technical field [0001] The invention relates to a motor, in particular to a mixed excitation short magnetic circuit variable reluctance motor, which belongs to the field of electric drive. 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 attracted widespread attention due to its simple and solid structure, wide speed range, excellent performance, high efficiency and high reliability. [0003] The general variable reluctance motor includes a stator installed in the frame and a rotor that rotates relative to the stator. The stator and the rotor have protruding magnetic poles at a certain interval, and the number of magnetic poles of the stator and the rotor ...

AI Technical Summary

Problems solved by technology

When the rotor tries to rotate to the position where the reluctance of the magnetic circuit is minimized or the position where the inductance of the stator winding is maximized, a reluctance torque is generated. There is no permanent magnet in the rotor winding, and the field winding is fixed on the stator pole. To increase the output torque, a larger excitation current and more winding turns are required, which limits the improvement of the energy density of the motor; in addition, the general variable reluctance motor causes excessive vibration and noise levels due to its double salient pole structure , which limits the generalization and application of variable reluctance motors

[0004] In order to improve the volume energy ratio of the switched reluctance motor, Chinese invention patents: mixed excitation block stator and rotor switched reluctance motor (patent application number: 200910263110.6) and hybrid excitation block stator and rotor switched reluctance motor (patent application No.: 201010102546.X) adopts the method of mixed excitation to obtain a larger energy density ratio, which solves the problem of low energy density of general variable reluctance motors; however, the scheme provided in the patent No. 200910263110.6 leads to excitation windings The utilization rate of copper is low, and the solution provided in the patent No. 201010102546.X is to wind the winding on the yoke of the segmented stator segment, which is not easy to install, and the part of the excitation winding outside the stator segment is in the air around, heat dissipation Difficult, both patents use a fan-shaped rotor segment, which fails to improve the vibration and noise levels; in addition, in the two solutions, the permanent magnet is located in the notch of the stator segment, which makes it difficult to dissipate heat, which reduces the service life of the permanent magnet

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