Patent US3602745A successfully refreshed from Google Patents.
US3602745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Concentric linear induction motor
Assignee: Individual
•
Filing: 1970-03-27
•
Granted: 1971-08-31
•
Expires: 1990-03-27
Abstract
Abstract A linear induction motor formed of an elongated, stationary rotor core surrounded by stationary, concentric stator coils, with an elongated tubular rotor arranged between the coils and rotor core and surrounding the rotor core, for endwise axial movement upon energization of the coils. The coils may be formed of spaced-apart rolls of conductive tape arranged end to end in axial alignment and secured to a stator core.
Inventors
- 👤 Murray W Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:16
CPC Classifications
H; H02; H02K; H02K41/00; H02K41/02; H02K41/025
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
182 words
A linear induction motor especially adapted for long stroke applications, comprising: a stationary elongated rotor core made of a material of high magnetic permeability; rotor core positioning means for maintaining said rotor core in a fixed axial position relative to the motor; a stationary hollow cylindrical stator member made of a material of high magnetic permeability and positioned to concentrically surround and axially overlap said rotor core and radially spaced therefrom; a plurality of energizable coils concentrically surrounding said rotor core and mounted on said stator member; and an axially movable relatively light weight rotor tube made of an electrically conductive material and concentrically mounted in the radial space between said rotor core and said stator member, said rotor tube being supported and guided for axial movement relative to said rotor core and said stator member by bearings, said rotor tube being substantially longer than said rotor core and said stator member so as to be capable of achieving a long axial stroke upon energization of said coils while maintaining a full axial overlap with said rotor core and said stator member.
Claim 2
Dependent Claim
182 words
A linear induction motor especially adapted for long stroke applications, comprising: a stationary elongated rotor core made of a material of high magnetic permeability; rotor core positioning means for maintaining said rotor core in a fixed axial position relative to the motor; a stationary hollow cylindrical stator member made of a material of high magnetic permeability and positioned to concentrically surround and axially overlap said rotor core and radially spaced therefrom; a plurality of energizable coils concentrically surrounding said rotor core and mounted on said stator member; and an axially movable relatively light weight rotor tube made of an electrically conductive material and concentrically mounted in the radial space between said rotor core and said stator member, said rotor tube being supported and guided for axial movement relative to said rotor core and said stator member by bearings, said rotor tube being substantially longer than said rotor core and said stator member so as to be capable of achieving a long axial stroke upon energization of said coils while maintaining a full axial overlap with said rotor core and said stator member.
Claim 3
Dependent Claim
40 words
A circuit of the type described in claim 1 wherein information is stored in said memory in character positions with an entry marker being stored in the character position in which the next input character would normally be stored; and
Claim 4
Dependent Claim
151 words
A linear induction motor especially adapted for long stroke applications, comprising: a stationary elongated rotor core made of a material of high magnetic permeability; rotor core positioning means for maintaining said rotor core in fixed axial position relative to the motor; a stationary hollow cylindrical stator positioned to concentrically surround and axially overlap said rotor core and radially spaced therefrom; and an axially movable relatively lightweight rotor tube made of an electrically conductive material and concentrically mounted in the radial space between said rotor core and said stator member, said rotor tube being supported and guided for axial movement relative to said rotor core and said stator member, said rotor tube being substantially longer than said rotor core and said stator so as to be capable of achieving a long axial stroke upon energization of said stator while maintaining a full axial overlap with said rotor core and said stator member.
Claim 5
Dependent Claim
151 words
A linear induction motor especially adapted for long stroke applications, comprising: a stationary elongated rotor core made of a material of high magnetic permeability; rotor core positioning means for maintaining said rotor core in fixed axial position relative to the motor; a stationary hollow cylindrical stator positioned to concentrically surround and axially overlap said rotor core and radially spaced therefrom; and an axially movable relatively lightweight rotor tube made of an electrically conductive material and concentrically mounted in the radial space between said rotor core and said stator member, said rotor tube being supported and guided for axial movement relative to said rotor core and said stator member, said rotor tube being substantially longer than said rotor core and said stator so as to be capable of achieving a long axial stroke upon energization of said stator while maintaining a full axial overlap with said rotor core and said stator member.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |