US3723779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compensated linear motor
Assignee: INFORMATION MAGNETICS CORP
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Filing: 1970-06-22
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Granted: 1973-03-27
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Expires: 1990-06-22
Abstract
Abstract A linear motor having a tubular shell and a center core of magnetic material, has a tubular working air gap formed between a magnet and the core or between the shell and the magnet. A tubular armature is disposed within the tubular air space. Compensation windings are provided that do not occupy the working air gap. Instead, these windings are placed in grooves in one surface of the working air gap and thereby do not increase the air gap dimension, nor decrease the flux density, resulting in an air gap of maximum flux density. With presently available magnets the grooves are preferably formed in the magnetic material of the shell or core. The compensation windings may be shorted, connected with the armature, as in parallel, or any combination.
Inventors
- 👤 D Gillum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:22
CPC Classifications
H; H02; H02K; H02K41/00; H02K41/02; H02K41/035; H02K41/0352; H02K41/0354; H02K41/0356
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
125 words
A compensated linear electric motor comprising: a. a tubular shell of magnetic material having a tubular axis; b. a center core of magnetic material magnetically connected to the shell by at least one low reluctance magnetic path, and spaced from the shell; c. a radially polarized tubular permanent magnet disposed within the tubular shell for magnetic contact with the surface of one of said shell or center core and spaced from the surface of other to form a working air gap; d. a compensation winding disposed at one air gap surface; e. an armature winding disposed in said air gap; f. and means for supporting the armature for axial movement within the motor; g. and conductors connecting the compensation winding and armature winding in parallel.
Claim 2
Dependent Claim
125 words
A compensated linear electric motor comprising: a. a tubular shell of magnetic material having a tubular axis; b. a center core of magnetic material magnetically connected to the shell by at least one low reluctance magnetic path, and spaced from the shell; c. a radially polarized tubular permanent magnet disposed within the tubular shell for magnetic contact with the surface of one of said shell or center core and spaced from the surface of other to form a working air gap; d. a compensation winding disposed at one air gap surface; e. an armature winding disposed in said air gap; f. and means for supporting the armature for axial movement within the motor; g. and conductors connecting the compensation winding and armature winding in parallel.
Claim 3
Dependent Claim
128 words
A compensated linear electric motor comprising: a. a tubular shell of magnetic material having a tubular axis; b. a center core of magnetic material magnetically connected to the shell by at least one low reluctance magnetic path, and spaced from the shell; c. a radially polarized tubular permanent magnet disposed within the tubular shell for magnetic contact with the surface of one of said shell or center core and spaced from the surface of other to form a working air gap wherein at least one surface of said air gap is grooved; d. a compensation winding disposed in the grooves of said one air gap surface; e. an armature winding disposed in said air gap; f. and means for supportinG the armature for axial movement within the motor.
Claim 4
Dependent Claim
128 words
A compensated linear electric motor comprising: a. a tubular shell of magnetic material having a tubular axis; b. a center core of magnetic material magnetically connected to the shell by at least one low reluctance magnetic path, and spaced from the shell; c. a radially polarized tubular permanent magnet disposed within the tubular shell for magnetic contact with the surface of one of said shell or center core and spaced from the surface of other to form a working air gap wherein at least one surface of said air gap is grooved; d. a compensation winding disposed in the grooves of said one air gap surface; e. an armature winding disposed in said air gap; f. and means for supportinG the armature for axial movement within the motor.
Claim 5
Dependent Claim
39 words
A linear motor as defined in claim 2 wherein the center core is peripherally grooved and the compensation winding is placed in said grooves, to thereby obtain distributed air gap compensation without the compensation winding occupying the air gap.
Claim 6
Dependent Claim
52 words
A linear motor as set forth in claim 2 wherein the center core is an air gap surface and has a helical groove therein and the compensation winding is helical and located in said groove, to obtain air gap surface compensation without the compensation occupying any appreciable part of the air gap.
Claim 7
Dependent Claim
76 words
A compensated linear motor having an axis of reciprocation comprising: a. a core of magnetic material; b. a magnet having a polarization transverse to the axis and separated by a space from said core to define a working air gap; c. an armature coil having at least a portion disposed in said working air gap; d. a compensation winding magnetically coupled to said core; e. and conductors connecting said armature coil and compensation coil in parallel.
Claim 8
Dependent Claim
76 words
A compensated linear motor having an axis of reciprocation comprising: a. a core of magnetic material; b. a magnet having a polarization transverse to the axis and separated by a space from said core to define a working air gap; c. an armature coil having at least a portion disposed in said working air gap; d. a compensation winding magnetically coupled to said core; e. and conductors connecting said armature coil and compensation coil in parallel.
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |