Permanent magnet synchronous motor rotor of mixed magnetic steel

Abstract

The object of the present invention is to disclose a permanent magnet synchronous motor rotor of mixed magnetic steel, which is composed of first magnetic steel, second magnetic steel, third magneticsteel, and a rotor core. The first, second and third magnetic steel are alternately distributed and embedded in the rotor core to form a plurality of magnetic poles. Each magnetic pole has N layers ofmagnetic steel, wherein N is a natural number greater than or equal to 3. The first, second and third magnetic steel are alternately distributed on the magnetic poles in sequence. Compared with the prior art, the multilayer magnetic steel arrangement can easily obtain a good magnetic flux concentration effect and pole arc coefficient control, solves the contradiction between the structural strength and the magnetic isolation effect of the tangential magnetic steel arrangement, and effectively reduces the performance degradation caused by the pole leakage reactance of the motor. A layer of themultilayer magnetic steel close to the outer circle of the rotor core is the radial magnetic steel to further enhance the magnetic flux concentration effect to achieve the object of the present invention.

Description

technical field [0001] The invention relates to a motor rotor, in particular to a permanent magnet synchronous motor rotor with mixed magnetic steel. Background technique [0002] In the prior art, the reluctance torque generated by the asymmetry of the rotor magnetic circuit of the built-in permanent magnet synchronous motor is beneficial to improve the overload capacity and power density of the motor, and has been applied more and more. [0003] The traditional arrangement of rotor magnets includes "one" shape, "V" shape and "V"+"one" shape, but the motor reluctance torque of the above magnetic circuit structures is not large, The consumption is relatively large. In order to increase the proportion of the reluctance torque of the motor and improve the magnetic field weakening capability of the motor, double "V" and multi-"V" magnet topologies have also begun to appear in recent years. With the increase in the number of layers, the motor's The structural strength will det...

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Problems solved by technology

[0003] The traditional arrangement of rotor magnets includes "one" shape, "V" shape and "V"+"one" shape, but the motor reluctance torque of the above magnetic circuit structures is not large, relatively large consumption

In order to increase the proportion of the reluctance torque of the motor and improve the magnetic field weakening capability of the motor, double "V" and multi-"V" magnet topologies have also begun to appear in recent years. With the increase in the number of layers, the motor's The structural strength will become worse, so the application of multilayer magnetic steel topological structure will receive more and more challenges as the motor speed increases

[0004] In addition, there are also rotor structures with tangentially arranged magnets, while traditional tangentially arranged permanent magnet synchronous motors generally use a single-layer tangential magnetic circuit, which has no magnetic gathering ability and is easily demagnetized by the armature reaction.

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