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Title: US4542311: Long linear stroke reciprocating electric machine
[ Derwent Title ]

Country: US United States of America

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7 pages

Inventor: Newman, Wyatt S.; Riverdale, NY
Goldowsky, Michael P.; Valhalla, NY

Assignee: North American Philips Corporation, New York, NY
other patents from NORTH AMERICAN PHILIPS CORPORATION (407820) (approx. 1,166)
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Published / Filed: 1985-09-17 / 1983-12-27

Application Number: US1983000565952

IPC Code: Advanced: H02K 33/16; H02K 33/18; H02K 35/02; H02K 35/04;
Core: H02K 33/00; H02K 35/00; more...
IPC-7: H02K 33/00;

U.S. Class: Current: 310/013; 310/015; 310/027; 310/030;
Original: 310/013; 310/027; 310/015; 310/030;

Field of Search: 310/013,27,15,30

Priority Number:
1983-12-27  US1983000565952

Abstract: A linear stroke reciprocating electric machine provides both high efficiency and linearity. A cylindrical air gap is defined between outer and inner gap defining surfaces, at least one of which has a length equal to the length of an electric coil plus the length of the stroke. A flux focusing ring, having a length in the direction of movement equal to the length of the coil in the same direction, concentrates substantially all the field flux and all of the electric coil turns to interact over the entire stroke.

Attorney, Agent or Firm: Treacy, David R. ;

Primary / Asst. Examiners: Duggan, Donovan F.;

Maintenance Status: E1 Expired  Check current status

INPADOC Legal Status: Show legal status actions

Family: None

First Claim:
Show all 13 claims
I claim:     1. A linear stroke reciprocating electric machine, comprising
two relatively movable members, mounted to be relatively linearly movable with respect to each other in a movement direction, one of said members being an electric coil, and the other member being a magnetic gap ring having a gap-defining surface having a given length in said movement direction,
a magnetic stator structure fixed to one of said relatively movable members, said structure and said gap ring being gap-defining members, and said structure having a surface spaced from said gap-defining surface to define a gap therebetween, said electric coil being arranged in the gap between the gap ring and the stator structure, and said coil having a length in said movement direction substantially less than said given length,
magnet means for producing a field flux across at least portion of said gap,
means for establishing electrical connection to pass electrical current through said coil, for urging relative motion between said relatively movable members in said movement direction, and
a flux focusing ring, having a length in the movement direction substantially equal to said coil length, said focusing ring being formed of a magnetic material and arranged in said gap between the coil and one of said two gap-defining members, said focusing ring having a thickness compared to the gap width such that substantially all the field flux passes through the coil and the focusing ring, said focusing ring and said coil being fixed relative to each other,
whereby relative movement of said coil and gap ring over a stroke equal to the difference between said given length and said coil length provides a long linear stroke, with substantially all the field flux and all the coil turns interacting over the entire stroke.

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Forward References: Show 24 U.S. patent(s) that reference this one

U.S. References: Go to Result Set: All U.S. references   |  Forward references (24)   |   Backward references (6)   |   Citation Link

Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 4pp US3018467  1962-01 Harris   Resonant reactively operating variable position transducer
Get PDF - 7pp US3505544  1970-04 Helms   LINEAR MOTOR
Get PDF - 16pp US4161666  1979-07 Bacsanyi et al.  Ransburg Corporation Imbalance determining apparatus
Get PDF - 7pp US4227142  1980-10 Jarret et al.   Pulsed excitation alternator
Get PDF - 13pp US4427906  1984-01 Kainuma et al.  Sawafuji Electric Co., Ltd. Vibrating compressor
Get PDF - 7pp US4439700  1984-03 Menzel et al.  Vacuumschmelze GmbH Magnetic drive system for generating linear movements
Foreign References: None

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