A double-layer permanent magnet composite magnetic circuit memory motor

Abstract

The invention discloses a double-layer permanent magnet composite magnetic circuit memory motor, comprising a hybrid permanent magnet rotor, a stator, an armature winding and a rotating shaft, whereinthe hybrid permanent magnet rotor comprises a rotor iron core, a plurality of double-layer permanent magnet regions are uniformly distributed in the circumferential direction of the rotor iron core,the double-layer permanent magnet regions comprise a U-shaped hybrid permanent magnet structure and a V-shaped permanent magnet structure, and the U-shaped hybrid permanent magnet structure comprisesa second high coercivity and a low coercivity permanent magnet. The V-shaped permanent magnet structure comprises a first high coercivity permanent magnet arranged in the opening of the U-shaped hybrid permanent magnet structure, the opening of the U-shaped hybrid permanent magnet structure and the V-shaped permanent magnet structure facing the stator, and the low coercivity permanent magnet and the second high coercivity permanent magnet are in parallel magnetic circuit and in series magnetic circuit with the first high coercivity permanent magnet. The invention combines the advantages of theparallel magnetic circuit type and the series magnetic circuit type memory motor, realizes the improvement of the torque density of the motor, avoids the demagnetization problem of the low coercive force permanent magnet load, and further widens the speed regulating range and the high efficiency operation interval of the motor.

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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