Patent US3704402A successfully refreshed from Google Patents.
US3704402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed controlled synchronous inverter motor
Assignee: Siemens AG
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Filing: 1971-02-17
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Granted: 1972-11-28
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Expires: 1991-02-17
Abstract
Abstract A speed controlled synchronous inverter motor is supplied from a multiphase alternating-current line of substantially constant frequency and voltage through rectifiers and inverters via a direct-current intermediate circuit. The motor is a mediumfrequency machine whose armature winding and excitation winding are both located on the non-rotating part. The excitation winding is connected in series to the direct-current intermediate circuit and works also as a smoothing reactor.
Inventors
- 👤 Wilhelm Leitgeb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:13
CPC Classifications
H; H02; H02K; H02K19/00; H02K19/02; H02K19/10; H02K19/103
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
A speed controllable inverter motor of the synchronous type with circuit means for energizing the motor from a multiphase line of substantially constant frequency and voltage, said energizing circuit means comprising rectifier means and inverter means and an intermediate direct-current circuit between said rectifier means and said inverter means, said inverter motor being a medium-frequency machine having a rotor and a stator, said machine having an excitation winding on said stator, said excitation winding being series connected in said intermediate circuit and forming part thereof.
Claim 2
Dependent Claim
85 words
A speed controllable inverter motor of the synchronous type with circuit means for energizing the motor from a multiphase line of substantially constant frequency and voltage, said energizing circuit means comprising rectifier means and inverter means and an intermediate direct-current circuit between said rectifier means and said inverter means, said inverter motor being a medium-frequency machine having a rotor and a stator, said machine having an excitation winding on said stator, said excitation winding being series connected in said intermediate circuit and forming part thereof.
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) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |