Permanent magnet motor structure for cryogenic pumps

Abstract

The invention provides a permanent magnet motor structure for cryogenic pumps, which belongs to the technical field of motor structure. The structure includes permanent magnets, auxiliary slots, magnetic isolation sleeves, starting cage bars, leaf-like holes, a shielding sleeve and air magnetic isolation slots. The permanent magnets are distributed in a 'T' shape, and are provided with the auxiliary slots filled with a non-magnetic material at the end. Each permanent magnet is provided with one magnetic isolation sleeve. The starting cage bars are symmetrically distributed at the edge of a rotor in an integrated three-bar way. The leaf-like holes are concentrically distributed on the rotor. The shielding sleeve is located between a stator and the rotor and is close to the stator. Accordingto the motor structure of the invention, the 'T'-type distribution of the permanent magnets improves the saliency ratio, the auxiliary slots at the end are filled with a non-magnetic material to reduce magnetic leakage and fix the permanent magnets, the magnetic isolation sleeves and the air magnetic isolation slots can reduce magnetic leakage, the starting cage bars can improve the starting torque and shorten the starting time, the leaf-like holes can reduce the inertia of the rotor, circulate the low-temperature medium and strengthen heat dissipation, and the shielding sleeve can prevent the medium from corroding the stator core and the windings.

Description

technical field [0001] The invention relates to a permanent magnet motor structure for a cryopump, belonging to the technical field of motor structures. Background technique [0002] The transportation of cryogenic medium (such as liquefied natural gas, liquid nitrogen, liquid hydrogen, etc.) usually requires a cryogenic pump. Since the temperature of the cryogenic medium is usually relatively low, as the core operating part of the cryogenic pump, the pump motor should be a cryogenic motor. The permanent magnet motor has the characteristics of high efficiency, simple structure and reliable operation. The shape and size of the motor are diverse and flexible, and it is widely used in various fields of aerospace, national defense, industrial and agricultural production and daily life. With the extensive research of cryogenic motors all over the world, the application of high-efficiency low-temperature permanent magnet motors in cryopumps has broad prospects for development. Ho...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a permanent magnet motor structure for cryopumps to solve the problems of magnetic flux leakage, slow heat dissipation and difficult starting of existing permanent magnet motors during operation.

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