Patent US4633108A successfully refreshed from Google Patents.
US4633108A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct current linear motor
Assignee: Papst Licensing GmbH and Co KG
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Filing: 1985-07-22
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Granted: 1986-12-30
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Expires: 2005-07-22
Abstract
Abstract A direct current linear motor, particularly for use in data processing drive systems, is provided. The motor includes a plurality of permanent magnet poles disposed linearly adjacent each other, a ferromagnetic structure having a multi-strand winding formed of a plurality of coils, each strand forming a coil, the permanent magnet poles and the ferromagnetic structure being linearly moveable relative to each other. A flat air gap is defined between and separates the permanent magnet poles and the ferromatic structure. The ratio of the coil pitch of the ferromatic structure to the magnetic poles of the permanent magnet system is not greater than 1.
Inventors
- 👤 Johann von der Heide
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:44
CPC Classifications
H; H02; H02K; H02K41/00; H02K41/02; H02K41/03; H02K41/031
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
207 words
A brushless direct current linear motor, particularly for use in data processing drive systems, said motor having a stationary portion and an armature and comprising: a permanent magnetic system formed of a plurality of permanent magnet poles disposed linearly adjacent each other and being alternately magnetized; a ferromagnetic structure formed of at least one slotted flux-carrying member and a plurality of coils connected into a three independent-coil type winding, the coils disposed linearly adjacent each other on the flux-carrying member, the coils being energized in cyclic sequence and each said coil separately surrounding a substantially T-shaped pole of the at least one flux-carrying member between adjacent slots thereof; and a flat air gap defined between and separating said permanent magnetic system and said ferromagnetic structure; the ratio of the coil pitch of said ferromagnetic structure to the magnetic pitch of the permanent magnetic system being 2:3 irrespective of the number of coils; said permanent magnetic system and said ferromagnetic structure being linearly moveable relative to each other in their longitudinal direction, the axis of each said coil of said ferromagnetic structure extending perpendicular to the direction of relative movement and the permanent magnet poles being alternately magnetized in a direction perpendicular to the direction of relative movement.
Claim 2
Dependent Claim
207 words
A brushless direct current linear motor, particularly for use in data processing drive systems, said motor having a stationary portion and an armature and comprising: a permanent magnetic system formed of a plurality of permanent magnet poles disposed linearly adjacent each other and being alternately magnetized; a ferromagnetic structure formed of at least one slotted flux-carrying member and a plurality of coils connected into a three independent-coil type winding, the coils disposed linearly adjacent each other on the flux-carrying member, the coils being energized in cyclic sequence and each said coil separately surrounding a substantially T-shaped pole of the at least one flux-carrying member between adjacent slots thereof; and a flat air gap defined between and separating said permanent magnetic system and said ferromagnetic structure; the ratio of the coil pitch of said ferromagnetic structure to the magnetic pitch of the permanent magnetic system being 2:3 irrespective of the number of coils; said permanent magnetic system and said ferromagnetic structure being linearly moveable relative to each other in their longitudinal direction, the axis of each said coil of said ferromagnetic structure extending perpendicular to the direction of relative movement and the permanent magnet poles being alternately magnetized in a direction perpendicular to the direction of relative movement.
Claim 3
Dependent Claim
41 words
A motor according to claim 1 wherein the permanent magnetic system is stationary and the ferromagnetic structure is the armature and has at least three poles aligned adjacent each other in the direction of linear movement, each pole including a coil.
Claim 4
Dependent Claim
28 words
A motor according to claim 2, wherein at least two flux guide members with associated coils are symmetrically located on the opposite sides of the permanent magnetic system.
Claim 5
Dependent Claim
20 words
A motor according to claim 1 wherein the permanent magnetic system is the armature and the ferromagnetic structure is stationary.
Claim 6
Dependent Claim
27 words
A motor according to claim 2, wherein on each side of the armature a guide bar is provided, the armature being supported thereon by a three-point support.
Claim 7
Dependent Claim
28 words
A motor according to claim 4 wherein on each side of the armature there is provided a guide bar, the armature being supported thereon by a three-point support.
Claim 8
Dependent Claim
41 words
A motor according to claim 5, wherein the three-point support comprises two double conical rollers spaced in the direction of movement of the armature in contact with one guide bar and a cylindrical roller in contact with the other guide bar.
Claim 9
Dependent Claim
28 words
A motor according to claim 7, wherein the rollers are rotatably supported in a frame, said frame carrying fall safety means, particularly in the form of safety lugs.
Claim 10
Dependent Claim
20 words
A motor according to claim 8, wherein the frame comprises guide bars on the side facing away from the rollers.
Claim 11
Dependent Claim
27 words
The motor according to claim 1, further comprising armature position sensors responsive to the magnetic field and located in the direct field of the permanent magnetic system.
Claim 12
Dependent Claim
27 words
A motor according to claim 1, wherein at least two flux-carrying members with associated coils are symmetrically located on the opposite sides of the permanent magnetic system.
Claim 13
Dependent Claim
76 words
A motor according to claim 1 wherein the armature includes only a single slotted flux-carrying member having the coils disposed thereon, said single flux-carrying member and coils being located on one side of the permanent magnetic system and being connected to a load, said armature being arranged relative to the permanent magnetic system such that the resultant point of gravity of the combined armature and load approximately coincides with the position of the flat air gap.
References Cited (Backward Citations)
US3707924A
Cited
US4151447A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-29 | 1990-06-30 | 1990-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-29 | 1994-06-30 | 1994-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-29 | 1998-06-30 | 1998-12-30 | $7700.00 | Window Closed / Lapsed |