US3886383A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compressed back iron linear motor laminated core
Assignee: Rohr Inc
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Filing: 1974-04-01
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Granted: 1975-05-27
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Expires: 1994-04-01
Abstract
Abstract An improved laminated motor core for a linear induction motor utilizing gramme ring windings. The upper pole piece portion of the core is substantially smaller in width than the widest portion of the lower back iron portion. The cross-sectional perimeter of the back iron portion provides a minimum mean length turn for the gramme ring windings.
Inventors
- 👤 James A Ross
- 👤 James A Houdyshel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 01:51
CPC Classifications
H; H02; H02K; H02K41/00; H02K41/02; H02K41/025; B; B60; B60L; B60L13/00; B60L13/03; B60L2200/00; B60L2200/26
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
66 words
An improved laminated core for a linear induction motor employing windings comprising: a plurality of interleaved laminations of different heights; a top pole piece portion having an upper face and a bottom back iron portion with a rectilinear tapered transition therebetween, said face has a cross-sectional dimension less than the largest cross-sectional dimension of said back iron portion for concentrating the flux produced by the core.
Claim 2
Dependent Claim
66 words
An improved laminated core for a linear induction motor employing windings comprising: a plurality of interleaved laminations of different heights; a top pole piece portion having an upper face and a bottom back iron portion with a rectilinear tapered transition therebetween, said face has a cross-sectional dimension less than the largest cross-sectional dimension of said back iron portion for concentrating the flux produced by the core.
Claim 3
Dependent Claim
11 words
The invention of claim 1 wherein said windings are gramme rings.
Claim 4
Dependent Claim
11 words
The invention of claim 1 wherein said windings are lap wound.
Claim 5
Dependent Claim
16 words
The invention of claim 1 wherein the individual laminations of said laminated core are side-by-side stacked.
Claim 6
Dependent Claim
13 words
The invention of claim 4 wherein said laminations have equal length and thickness.
Claim 7
Dependent Claim
18 words
The invention of claim 5 wherein the upper and lower surfaces of said laminations terminate on parallel planes.
Claim 8
Dependent Claim
23 words
The invention of claim 6 wherein the cross-sectional configuration of said pole piece portion is trapezoidal and said back iron portion is square.
Claim 9
Dependent Claim
73 words
An improved laminated core for a linear induction motor employing windings comprising: a top pole piece portion having an upper face and a bottom back iron portion, said face has a cross-sectional dimension of said back iron portion for concentrating the flux produced by the core, said back iron portion is serpentiform having side by side stacked laminations of equal length and thickness with their upper and lower surfaces terminating on parallel planes.
Claim 10
Dependent Claim
73 words
An improved laminated core for a linear induction motor employing windings comprising: a top pole piece portion having an upper face and a bottom back iron portion, said face has a cross-sectional dimension of said back iron portion for concentrating the flux produced by the core, said back iron portion is serpentiform having side by side stacked laminations of equal length and thickness with their upper and lower surfaces terminating on parallel planes.
Claim 11
Dependent Claim
23 words
The invention of claim 8 wherein the lower surface of said laminations are first folded in a clockwise and then a couterclockwise direction.
Claim 12
Dependent Claim
21 words
The invention of claim 9 wherein the lower surface of said laminations terminate at a position elevated from the core base.
Claim 13
Dependent Claim
24 words
The invention of claim 9 wherein the lower surfaces of said laminations terminate on the same plane as the base of said back iron.
Claim 14
Dependent Claim
77 words
An improved laminated core for a linear induction motor employing windings comprising: a top pole piece portion having an upper face and a bottom back iron portion, said face has a cross-sectional dimension less than the largest cross-sectional dimension of said back iron portion for concentrating the flux produced by the core, said back iron portion is constructed of side by side stacked laminations of equal length and thickness, the lower portion of said laminations are spiralform.
Claim 15
Dependent Claim
77 words
An improved laminated core for a linear induction motor employing windings comprising: a top pole piece portion having an upper face and a bottom back iron portion, said face has a cross-sectional dimension less than the largest cross-sectional dimension of said back iron portion for concentrating the flux produced by the core, said back iron portion is constructed of side by side stacked laminations of equal length and thickness, the lower portion of said laminations are spiralform.
Claim 16
Dependent Claim
15 words
The invention of claim 12 wherein said spiralform portion is formed in a clockwise direction.
Claim 17
Dependent Claim
75 words
An improved laminated core for a linear induction motor employing windings comprising: a top pole piece portion having an upper face and a bottom back iron portion, said face has a cross-sectional dimension less than the largest cross-sectional dimension of said back iron portion for concentrating the flux produced by the core, said back iron portion is constructed of side by side stacked liminations of equal length and thickness, said back iron portion is curvilinear.
Claim 18
Dependent Claim
75 words
An improved laminated core for a linear induction motor employing windings comprising: a top pole piece portion having an upper face and a bottom back iron portion, said face has a cross-sectional dimension less than the largest cross-sectional dimension of said back iron portion for concentrating the flux produced by the core, said back iron portion is constructed of side by side stacked liminations of equal length and thickness, said back iron portion is curvilinear.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |