Rotor sectional type flux switching motor and method for improving sine degree of back electromotive force thereof

Abstract

The invention discloses a rotor sectional type flux switching motor and a method for improving the sine degree of back electromotive force thereof, belonging to the field of stator permanent-magnetic motors. The motor of the invention comprises salient pole stators, an armature winding, salient pole rotors and an electro-magnetic winding, wherein a permanent magnet is embedded in a gap between every two salient pole stators; the armature winding is wound on two salient pole stator arms connected with the permanent magnets; the electro-magnetic winding is wound on the permanent magnets in a vertical direction of the armature winding, and the excitation directions of adjacent permanent magnets are opposite; and the salient pole rotors are sectioned according to a space mechanical angle alpha along the axial direction. In the method of the invention, the back electromotive force generated by the salient pole stator A and the salient pole rotor A in the armature winding and the back electromotive force generated by the salient pole stator B and the salient pole rotor B in the armature winding have a phase difference of 180 degree electric angle, and correspondingly, the excitation directions of the permanent magnets embedded in salient pole stator teeth are opposite, so the back electromotive force of a synthesized unicoil has high sine degree and high amplitude value with the synthesized coefficient of 1.

Description

technical field [0001] The invention relates to a magnetic flux switching motor and a method thereof, in particular to a rotor segmented magnetic flux switching motor and a method for increasing the sinusoidal degree of back electromotive force, belonging to the field of special motors. Background technique [0002] In the field of motors, permanent magnet motors have absolute advantages in terms of efficiency, power density, and torque density, and are more suitable for occasions that have strict requirements on volume and power. However, the permanent magnets are placed on the rotor, and there are the following problems during high-power / wide-speed operation: 1. The centrifugal force is large during high-speed rotation, and the permanent magnets must be protected; 2. The heat dissipation of the permanent magnets is difficult; 3. The magnetic field of the permanent magnets and the electric current The armature magnetic field is a series structure, and the permanent magnet i...

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Problems solved by technology

[0008] In order to solve the problem that the structure of the magnetic flux switching motor body is not completely symmetrical and the back EMF harmonic of its single coil is relatively large, the present invention proposes a magnetic flux switching motor with a single coil with high back EMF amplitude and high back EMF sine degree and Its method of increasing the sine degree of the back EMF

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