Mixed excitation permanent magnet motor based on three-stage stator axial complementary structure

Abstract

The invention discloses a mixed excitation permanent magnet motor based on a three-stage stator axial complementary structure. An outer stator of the mixed excitation permanent magnet motor comprisesthree outer stator stages arranged along the axial direction in an equally-spaced manner, the difference of the initial angles of every two adjacent outer stages is a mechanical angle alpha, and alphais equal to 360 degrees / p, wherein p is the number of pole-pairs of the motor, p is equal to 3i, and i is a positive integer; an armature winding is wound on the outer stator teeth of each outer stator stage respectively, and each armature winding is a fractional-slot concentrated winding respectively; the rotor is an internally installed V-shaped rotor with heteropolarly alternated poles, the rotor is provided with 2p / 3 permanent magnet pole pairs and p / 3 iron core pole pairs; an exciting winding is wound on the inner stator teeth of the inner stator, the number of pole-pairs of the excitingwinding is p / 3, and each exciting winding is an integer slot distributed winding respectively. The flux density of an outer air gap can be changed by taking the iron core pole of the rotor as a channel in a rotating magnetic field generated by the inner stator, and the problem that the counter potential amplitudes are unequal existing in the heteropolarly alternated poles is solved. Moreover, themanufacturing cost and demagnetization risk are reduced while the reliability is improved.

Description

technical field [0001] The invention relates to the field of motor structure design, in particular to a hybrid excitation permanent magnet motor based on a three-stage stator axial complementary structure. Background technique [0002] With the rapid development of permanent magnet motor technology, various new permanent magnet motors have been widely used. According to statistics, the global consumption of rare earth permanent magnet materials has reached 20% of the total consumption of magnetic materials in 2015. my country is a major producer of rare earth permanent magnet materials, and the consumption of rare earths in 2015 was as high as 40%, reaching 80,000 tons. Since 2005, the global rare earth consumption has continued to grow at a rate of nearly 3.36% per year, and China occupies an absolute dominant position in it. At present, China's rare earths account for 85% of the global rare earth supply, which will greatly consume the existing rare earth permanent magnet...

AI Technical Summary

Problems solved by technology

As a result, the amplitudes of the opposite potentials are not equal, which will greatly affect the electromagnetic parameter characteristics of the motor

[0006] In order to solve the asymmetric topological magnetic circuit of "heteropolar" motors, some studies have adopted the method of multi-winding, but because the number of stator teeth is not equal to the number of rotor pole pairs, multi-winding still cannot completely solve the problem of magnetic circuit asymmetry. , at the same time, if the electric excitation winding is added, the asymmetry of the magnetic circuit will be aggravated due to problems such as the coupling of various harmonics

[0007] At the same time, it can be seen from the field modulation theory that the reason for the asymmetry of the back EMF magnetic circuit is because of harmonic interference, and the original technology does not use the interference harmonics, so that the interference harmonics in the "heteropolarity" motor are wasted. Increased torque ripple and motor losses

[0008] The original "different polarity" multi-winding excitation cannot completely solve the problem of magnetic circuit asymmetry

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