Motor rotor, manufacturing method of motor rotor and permanent magnet assisted reluctance motor

Abstract

The invention provides a motor rotor, a manufacturing method of the motor rotor and a permanent magnet assisted reluctance motor. The motor rotor comprises a rotor iron core, a plurality of magnetic conduction channels and a plurality of permanent magnets, wherein the plurality of magnetic conduction channels and the plurality of permanent magnets are alternately stacked, the structure of the motor rotor is optimized, a magnetic isolation bridge is canceled, the magnetic leakage amount and the iron loss amount of the motor rotor are reduced, and the problem of rotor heating caused by local magnetic saturation at the magnetic isolation bridge is solved; and the rotor iron core and the magnetic conduction channels are made of iron-based powder metallurgy and have the characteristics of high magnetic conductivity and low iron loss, and the magnetic conduction channels located on the peripheral side of the rotor iron core form a concave structure, so that the salient pole ratio of the motor rotor is improved. The manufacturing method of the motor rotor comprises the steps of filling the rotor iron core position and the magnetic conduction channel position of the rotor mold with a soft magnetic powder metallurgy material, filling a magnetic barrier groove with a hard magnetic powder metallurgy material, pressing and sintering, and magnetizing the permanent magnet to form the motor rotor. The manufacturing process is simplified, and the power factor and the power density of the motor are improved.

Description

technical field [0001] The invention belongs to the technical field of motors, and in particular relates to a motor rotor, a manufacturing method of the motor rotor and a permanent magnet assisted reluctance motor. Background technique [0002] Permanent magnet synchronous motor is one of the main directions of motor development, and permanent magnet assisted reluctance motor is widely used because its power density is equivalent to that of rare earth permanent magnet synchronous motor without using expensive rare earth permanent magnets. In the existing permanent magnet assisted reluctance motor, the motor rotor includes a rotor core and a permanent magnet. The rotor core is made of silicon steel sheets superimposed, and the silicon steel sheet is punched out with magnetic barrier slots. The magnet is set in the magnetic barrier slot; multiple magnetic barrier slots and magnetic conduction channels are formed on the rotor core, and the magnetic conduction channels are conne...

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Problems solved by technology

[0003] In view of this, the present invention provides a motor rotor, a manufacturing method of the motor rotor, and a permanent magnet assisted reluctance motor to solve the problems of complex structure of the rotor in the prior art, cumbersome manufacturing process, and large magnetic flux leakage.

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