Layered rotor structure for high-speed permanent magnet motor and manufacturing method

Abstract

The invention discloses a layered rotor structure for a high-speed permanent magnet motor and a manufacturing method. The layered rotor structure comprises a rotor iron core, permanent magnets and a protective sleeve which are sequentially arranged from inside to outside in the radial direction, wherein the outer side of the rotor iron core is sleeved with the permanent magnets, and blocky ferritematerial filling bodies used for reducing deformation stress of the permanent magnets are arranged in gaps formed between adjacent protruding block bodies of the permanent magnets; the protective sleeve comprises an inner carbon fiber layer, a mixed layer, a copper shielding layer and an outer carbon fiber layer which are sequentially arranged from inside to outside in the radial direction; and the mixed layer comprises a carbon fiber pre-winding belt, the carbon fiber pre-winding belt is formed by flattening and bonding a flexible magnetic powder adhesive film on the surface of a carbon fiber belt, and the flexible magnetic powder adhesive film is formed by spraying and curing an adhesive film prefabricated material formed by uniformly mixing bonded permanent magnet magnetic powder and acolloid material. The layered rotor structure effectively reduces rotor eddy current loss and air friction loss, relieves the permanent magnet damage risk caused by too high local stress in the rotor, and enables the high-speed permanent magnet motor to develope towards higher rotating speed and higher power.

Description

technical field [0001] The invention belongs to the technical field of high-speed permanent magnet motors, and in particular relates to a layered surface-mounted rotor structure and a manufacturing method of a high-speed permanent magnet motor. Background technique [0002] High-speed permanent magnet motors have the advantages of small size and high power density, and are widely used in high-speed drive systems such as machine tool spindle motors, high-speed turbomachinery, and micro gas turbine power generation equipment. [0003] At present, the rotor of high-speed permanent magnet motor mainly adopts the structure of block permanent magnet surface-mounted and external sheath. Since the permanent magnet is subjected to great centrifugal tensile stress when the rotor rotates at high speed, and the tensile strength of sintered permanent magnet with high magnetic performance is low. Must be protected by an external sheath. However, on the one hand, the non-metallic sheath o...

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Problems solved by technology

However, on the one hand, the non-metallic sheath of the permanent magnet will affect the heat dissipation of the permanent magnet, and on the other hand, the eddy current loss of the metal sheath will also cause the temperature of the permanent magnet to rise too high. Flat-top wave distribution, which contains more high-order harmonics, will also increase the eddy current loss inside the motor; the local stress on the edge of the block permanent magnet is higher than other positions, which will easily cause damage to the permanent magnet

[0004] To sum up, the current high-speed permanent magnet motor rotor structure with a surface-mounted permanent magnet and a sheath structure has problems such as high temperature rise, large loss, local stress concentration, and high harmonic content of the air-gap magnetic field waveform, which limits its maximum Room for improvement in power and top speed

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