Patent US2516314A successfully refreshed from Google Patents.
US3681630A
Expired / Lapsed
US
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Air cooled linear motor
Assignee: INFORMATION MAGNETICS CORP
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Filing: 1971-08-16
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Granted: 1972-08-01
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Expires: 1991-08-16
Abstract
Abstract An open end motor of the linear motion type has a tubular air gap between a center core and a tubular magnet or field piece. An armature of tubular shape fits in the air gap and is mounted on a cup-shaped member. The relative movement between the core and the armature cup gives rise to a piston-cylinder structure which is utilized to pump air past the armature windings to cool them. A flexible washer on a closed end motor acts as a pump.
Inventors
- 👤 David A Sutton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:03
CPC Classifications
H; H02; H02K; H02K41/00; H02K41/02; H02K41/035; H02K41/0352; H02K41/0354; H02K41/0356
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
128 words
An air cooled linear motor of the open end type comprising a. a magnetized field piece having a bore; b. a center core spaced from the bore to define a tubular working air gap and having an outer end; c. a tubular armature reciprocable within the air gap in response to current flow therein and having an inner end and an outer end; d. a cup-shaped member secured to the outer end of the armature and cooperating with the outer end of the core to define a cylinder-piston pump; e. and a check valve in at least one of said core and cup to admit atmospheric air on one stroke and exhale air in the other stroke to move air past the armature coils to cool the same.
Claim 2
Dependent Claim
128 words
An air cooled linear motor of the open end type comprising a. a magnetized field piece having a bore; b. a center core spaced from the bore to define a tubular working air gap and having an outer end; c. a tubular armature reciprocable within the air gap in response to current flow therein and having an inner end and an outer end; d. a cup-shaped member secured to the outer end of the armature and cooperating with the outer end of the core to define a cylinder-piston pump; e. and a check valve in at least one of said core and cup to admit atmospheric air on one stroke and exhale air in the other stroke to move air past the armature coils to cool the same.
Claim 3
Dependent Claim
19 words
An air cooled linear motor as set forth in claim 1, wherein a check valve is in the cup.
Claim 4
Dependent Claim
19 words
An air cooled linear motor as set forth in claim 1, wherein a check valve is in the core.
Claim 5
Dependent Claim
33 words
An air cooled linear motor as set forth in claim 1, wherein the core is splined to reduce the resistance to air flow without reducing the magnetic strength of the working air gap.
Claim 6
Dependent Claim
18 words
An air cooled motor as set forth in claim 1, wherein the cup supports the armature for reciprocation.
Claim 7
Dependent Claim
96 words
An air cooled linear motor comprising: a. a tubular shell; b. a center core spaced from the shell to define a working air gap; c. a tubular armature coil disposed in the air gap for reciprocation therein; d. pump means secured to the armature and cooperating with at least one of said core or shell to form a pump; e. a chEck valve communicating one side of the pump means to atmosphere and located in at least one of said pump means, shell or core to move atmospheric air along said armature to cool the same.
Claim 8
Dependent Claim
96 words
An air cooled linear motor comprising: a. a tubular shell; b. a center core spaced from the shell to define a working air gap; c. a tubular armature coil disposed in the air gap for reciprocation therein; d. pump means secured to the armature and cooperating with at least one of said core or shell to form a pump; e. a chEck valve communicating one side of the pump means to atmosphere and located in at least one of said pump means, shell or core to move atmospheric air along said armature to cool the same.
Claim 9
Dependent Claim
42 words
An air cooled linear motor as set forth in claim 6, wherein one end of the motor is open and the pump means is a cup secured to the outer end of the armature to form a piston-cylinder pump with the core.
Claim 10
Dependent Claim
30 words
An air cooled linear motor as set forth in claim 6, wherein both ends of the motor are closed and the pump means is a washer secured to the armature.
Claim 11
Dependent Claim
21 words
An air cooled linear motor as set forth in claim 6, wherein the check valve is located in the pump means.
Claim 12
Dependent Claim
19 words
An air cooled linear motor as set forth in claim 6, wherein the check valve is on the core.
Claim 13
Dependent Claim
19 words
An air cooled linear motor as set forth in claim 6, wherein the check valve is on the shell.
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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |