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US3670187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ironless direct-current machine having a normal conducting rotor and a superconducting excitation system
Assignee: Siemens AG
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Filing: 1971-06-04
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Granted: 1972-06-13
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Expires: 1991-06-04
Abstract
Abstract An ironless direct-current machine with a rotor having a rotor winding of normal conductivity and being equipped with a superconducting excitation system is provided with compensation coils electrically coupled with the rotor and traversed by the rotor current. The superconducting excitation system has superconducting heteropolar excitation coils disposed between the compensation coils and the rotor winding. The compensation coils are dimensioned, arranged in proximity to the excitation coils and have ampere-turns such that the sum of the torque forces arising from the coaction of the field of the compensation coils with the current flowing through the excitation coils substantially cancels the torque forces arising from the coaction of the rotor winding field with the current flowing through the excitation coils.
Inventors
- 👤 Egon Thum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:42
CPC Classifications
H; H02; H02K; H02K23/00; H02K23/58; H02K55/00; Y; Y02; Y02E; Y02E40/00; Y02E40/60
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
114 words
Ironless direct-current machine with a rotor having a rotor winding of normal conductivity and being equipped with a superconducting excitation system, comprising compensation coils electrically coupled with the rotor and traversed by the rotor current, said system having superconducting heteropolar excitation coils disposed between said compensation coils and said rotor winding; said compensation coils being dimensioned, arranged in proximity to said excitation coils and having ampereturns such that the sum of the torque forces arising from the coaction of the field of said compensation coils with the current flowing through said excitation coils substantially cancels the torque forces arising from the coaction of the rotor-winding field with the current flowing through said excitation coils.
Claim 2
Dependent Claim
114 words
Ironless direct-current machine with a rotor having a rotor winding of normal conductivity and being equipped with a superconducting excitation system, comprising compensation coils electrically coupled with the rotor and traversed by the rotor current, said system having superconducting heteropolar excitation coils disposed between said compensation coils and said rotor winding; said compensation coils being dimensioned, arranged in proximity to said excitation coils and having ampereturns such that the sum of the torque forces arising from the coaction of the field of said compensation coils with the current flowing through said excitation coils substantially cancels the torque forces arising from the coaction of the rotor-winding field with the current flowing through said excitation coils.
Claim 3
Dependent Claim
148 words
A direct-current machine according to claim 1 comprising a commutator arranged on said rotor and connected to said rotor winding; each of said excitation coils having two sides extending in the longitudinal direction of said rotor; said rotor and rotor winding and said excitation coil jointly defining a first plane passing through the center of the corresponding commutation zone of said rotor winding and a corresponding side of said excitation coil, and defining a second plane passing through the axis of said rotor and said side of said excitation winding; said first and second planes defining an angle; a plurality of saId angles being defined by respective pluralities of said first and second planes; each of said compensation coils having two sides extending in said longitudinal direction, each of said sides of said compensation coils being disposed in the angular space of a corresponding one of said angles.
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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |