Large-aspect-ratio magnetic shaft structure of shaft type linear motor

Abstract

The invention discloses a large-aspect-ratio magnetic shaft structure of a shaft type linear motor. The large-aspect-ratio magnetic shaft structure comprises a cross-shaped hollow shaft, a fan-shaped radial magnetic shoe, a casing and an end cover, wherein the cross-shaped hollow shaft has a longitudinally-symmetrical and bilaterally-symmetrical projecting axial rib structure on an outer peripheral face of a hollow circular shaft; the outer peripheral face of the cross-shaped hollow shaft is axially connected with fan-shaped radial magnetic shoes at intervals; each segment is connected to an axial peripheral face between two ribs through four fan-shaped radial magnetic shoe inner cambered walls; adjacent segments of magnetic shoes are different-stage magnetic shoes; and the cross-shaped hollow shaft and the fan-shaped radial magnetic shoes are connected integrally and sleeved in a casing, and the two ends are meshed and fixed through end covers. The cross-shaped hollow shaft with a special-shaped section is taken as a support of magnetic steel in order to resist gravity fall of a magnetic steel shaft. A shoe-shaped magnetic steel monomer is adopted, and radial magnetization is performed, so that the problems of difficulty in radial magnetization of annular magnetic steel and complex assembly process of an axially-magnetized magnetic steel monomer are solved; the aspect ratio of the magnetic steel shaft is increased; the cost is lowered; and the application range of the shaft type linear motor is enlarged.

Description

technical field [0001] The invention relates to the field of axial linear motors, in particular to a magnetic shaft structure with a large aspect ratio of an axial linear motor. Background technique [0002] The cylindrical shaft linear motor with the solenoid coil as the mover has many advantages: (1) The structure is simple. The cylindrical linear motor can directly produce linear motion without an intermediate conversion mechanism, which greatly simplifies the structure, reduces the motion inertia, and greatly improves the dynamic response performance and positioning accuracy; at the same time, it also improves reliability and saves costs. Easier. Its unique combination of primary and secondary levels that can directly become part of the institution furthers this advantage. (2) Suitable for high-speed linear motion. Because there is no constraint of centrifugal force, ordinary materials can also achieve higher speeds. And if the air cushion or magnetic cushion is used...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a magnetic shaft structure with a large length-to-diameter ratio for a shaft-type linear motor. A cross hollow shaft with a special-shaped section is used as the support of the magnetic steel to resist the gravity droop of the magnetic steel shaft; Radial magnetization is carried out on the single-shaped magnet steel, which solves the difficulty of radial magnetization of ring magnets and solves the difficult problem of complex assembly process of magnet steel monomers using axial magnetization, thereby increasing the length-to-diameter ratio of the magnet shaft. Reduced cost and expanded application range of axial linear motors

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