A double-layer permanent magnet composite magnetic circuit memory motor

Abstract

Disclosed is a double-layer permanent magnet compound magnetic circuit memory motor, comprising a hybrid permanent magnet rotor, a stator, an armature winding and a rotating shaft, wherein the hybrid permanent magnet rotor comprises a rotor core; several double-layer permanent magnet areas are evenly distributed on the the circumferential direction of the rotor core; the double-layer permanent magnet area comprises a U-shaped hybrid permanent magnet structure and a V-shaped permanent magnet structure; the U-shaped hybrid permanent magnet structure comprises a second high coercive force permanent magnet and a low coercive force permanent magnet; the V-shaped permanent magnet structure comprises a first high coercive force permanent magnet arranged in an opening of the U-shaped hybrid permanent magnet structure; openings of the U-shaped hybrid permanent magnet structure and of the V-shaped permanent magnet structure face the stator; and the low coercive force permanent magnet is in a parallel magnetic circuit with the second high coercive force permanent magnet and is in a series magnetic circuit with the first high coercive force permanent magnet. The present invention incorporates the advantages of both memory motors of a parallel magnetic circuit type and memory motors of a series magnetic circuit type, the electric motor torque density can be increased, the problem of demagnetization of a low coercive force permanent magnet load is avoided, and the speed adjustment range and high efficiency operating range of an electric motor are further widened.

Description

technical field [0001] The invention relates to a permanent magnet memory motor, in particular to a double-layer permanent magnet composite magnetic circuit memory motor, which belongs to the technical field of motors. Background technique [0002] The permanent magnet synchronous motor (Permanent Magnet Synchronous Machine, PMSM) has the advantages of high power density, high efficiency, reliable operation and strong overload capacity due to the use of traditional rare earth permanent magnet materials with high magnetic energy product (such as high coercive force). An important direction for the development of the discipline. Thanks to the development of rare earth permanent magnet materials and power electronics technology, PMSM has largely replaced electric excitation motors in the small and medium power field, and has been widely used in various fields such as aerospace, national defense, industrial and agricultural production, and daily life. [0003] Ordinary permanen...

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Problems solved by technology

[0005] Aiming at the defects of the above-mentioned prior art, the present invention provides a double-layer permanent magnet composite magnetic circuit memory motor, which solves the need to reduce the demand for magnetizing current, control the cost of the power converter, and reduce the power consumption under load in the existing AC magnetic modulation memory motor The serious problem of cross demagnetization of low coercivity permanent magnets

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