US4607197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear and rotary actuator
Assignee: NMB USA Inc
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Filing: 1980-02-11
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Granted: 1986-08-19
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Expires: 2000-02-11
Abstract
Abstract A linear and rotary electromagnetic device particularly adapted as a linear and rotary stepper or stepper motor. A cylindrical movable member or armature is provided which is mounted for both axial movement and for angular movement about its axis. The armature member has teeth on its surface formed in both axial rows and in circumferential alignment or rows. Stator means having poles with windings associated with the poles is provided, the stator means having a central opening in which the movable armature member is mounted for axial and angular movement. By energizing certain angularly spaced windings, the movable armature member may be caused to rotate. By energizing axially spaced windings, the movable member of armature can be caused to move axially. Simultaneous angular and axial movement is achieved by energizing appropriate windings.
Inventors
- 👤 Coleman W. Conrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:14
CPC Classifications
H; H02; H02K; H02K41/00; H02K41/02; H02K41/03; H02K37/00; H02K37/02; H02K37/04; H02K2201/00; H02K2201/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
218 words
A linear and rotary stepping device including in combination, a first member having an axis and which is mounted to be movable angularly about its axis and to be movable axially thereof, said member having means formed on its surface which provide individual aligned angularly spaced teeth having end faces, said last means being constructed so that aligned individual axially spaced teeth having end faces are provided as well as angularly spaced teeth on the surface of the said member, stator means having groups of circumferentially spaced individual poles having end faces and including windings and having a circular central opening in which the movable member is disposed so that the teeth of the movable member can move adjacent to the poles of the stator means, the stator means including at least three of said groups of poles and windings which are spaced axially, the said stator means being constructed whereby energizing certain axially spaced stator windings, the movable member can be caused to move axially and by energizing selected stator windings that are angularly displaced from each other the said movable member is caused to rotate about its axis, the end faces of the said poles being adjacent the end faces of the teeth on the said movable member, all of said faces forming smooth uninterrupted surfaces.
Claim 2
Dependent Claim
218 words
A linear and rotary stepping device including in combination, a first member having an axis and which is mounted to be movable angularly about its axis and to be movable axially thereof, said member having means formed on its surface which provide individual aligned angularly spaced teeth having end faces, said last means being constructed so that aligned individual axially spaced teeth having end faces are provided as well as angularly spaced teeth on the surface of the said member, stator means having groups of circumferentially spaced individual poles having end faces and including windings and having a circular central opening in which the movable member is disposed so that the teeth of the movable member can move adjacent to the poles of the stator means, the stator means including at least three of said groups of poles and windings which are spaced axially, the said stator means being constructed whereby energizing certain axially spaced stator windings, the movable member can be caused to move axially and by energizing selected stator windings that are angularly displaced from each other the said movable member is caused to rotate about its axis, the end faces of the said poles being adjacent the end faces of the teeth on the said movable member, all of said faces forming smooth uninterrupted surfaces.
Claim 3
Dependent Claim
45 words
A device as in claim 1 wherein the capability of simultaneously imparting axial and angular movement to the movable member is provided by energizing certain windings that are axially spaced from each other and by energizing certain windings that are angularly spaced from each other.
Claim 4
Dependent Claim
33 words
A device as in claim 1 wherein the said teeth on the movable member are arranged in rows which include axial rows and also circumferential rows in which the teeth are angularly spaced.
Claim 5
Dependent Claim
34 words
A device as in claim 1 wherein the number of angularly spaced stator poles bears a predetermined relationship of the number of angularly spaced teeth on the moveable member at any given position thereon.
Claim 6
Dependent Claim
41 words
A device as in claim 1, including linear end bearings, the first member having smooth end parts journalled in the said end bearings whereby when an end part of the first member becomes positioned opposite the stator poles, movement is discontinued.
Claim 7
Dependent Claim
52 words
A device as in claim 1, wherein the device includes a housing having a cylindrical bore, each of said groups of poles comprising an individual circular stator member having inwardly extending poles and being of a size to fit into the said bore, there being spacer members between the individual stator members.
References Cited (Backward Citations)
US3869625A
Cited
US4197488A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-18 | 1990-02-17 | 1990-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-18 | 1994-02-17 | 1994-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-18 | 1998-02-17 | 1998-08-19 | $7700.00 | Window Closed / Lapsed |