Linear stepper motor
AssigneeTri-Tech, Inc.
InventorRobert Pulford, Jr.
Life of this patent
Estimating the term…
Abstract
In a preferred embodiment, linear stepper motor, comprising; an annular stator structure; an axially extending, cylindrical, permanent magnet shaft extending coaxially through said annular stator structure; and the axially extending, cylindrical, permanent magnet shaft having a smooth external surface along a portion thereof with axially alternating N and S poles defined circumferentially in an outer periphery of the portion of the axially extending, cylindrical, permanent magnet shaft. The present invention also provides a method of magnetizing the shaft of such a motor and a fixture and method of manufacturing the fixture therefor.
Claims19
A linear stepper motor, comprising:
- (a) an annular stator structure;
- (b) an axially extending, cylindrical, permanent magnet shaft extending coaxially through said annular stator structure;
- (c) said axially extending, cylindrical, permanent magnet shaft having a smooth external surface along a portion thereof with axially alternating N and S poles defined circumferentially in an outer periphery of said portion of said axially extending, cylindrical, smooth, permanent magnet shaft;
- (d) said portion of said axially extending, cylindrical, permanent magnet shaft has a solid core;
- (e) said solid core is formed from a non-magnetic material;
- and
- (f) said stator structure includes annular disks of a high lubricity material spacing apart elements of said stator structure and serving as bearing surfaces for said axially extending shaft.
A linear stepper motor, comprising;
- (a) an annular stator structure;
- (b) an axially extending, cylindrical, permanent magnet shaft extending coaxially through said annular stator structure;
- (c) said axially extending, cylindrical, permanent magnet shaft having a smooth external surface along a portion thereof with axially alternating N and S poles defined circumferentially in an outer periphery of said portion of said axially extending, cylindrical, smooth, permanent magnet shaft;
- and
- (d) said stator structure includes annular disks of a high lubricity material spacing apart elements of said stator structure and serving as bearing surfaces for said axially extending shaft.
Dependencies are inferred from the claim text.