US6462429B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction motor/generator system
Assignee: Hamilton Sundstrand Corp
•
Filing: 2000-02-24
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Granted: 2002-10-08
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Expires: 2020-02-24
Abstract
Abstract A generator/starter system for starting an engine and for tapping power from the engine in order to generate electricity includes a squirrel cage rotor, a main stator winding, an auxiliary stator winding, and an excitation source. The main stator winding is magnetically coupled to the squirrel cage rotor so as to provide an AC output in response to rotation of the squirrel cage rotor and so as to rotate the squirrel cage rotor in response to an AC input. The auxiliary stator winding is magnetically coupled to the squirrel cage rotor so as to provide excitation current when the main stator winding is providing the AC output. The source of excitation current is coupled to the auxiliary stator winding.
Inventors
- 👤 John Dhyanchand
- 👤 Donald G. Fair
- 👤 Chai-Nam Ng
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:58
CPC Classifications
H; H02; H02K; H02K17/00; H02K17/42; F; F02; F02N; F02N11/00; F02N11/04; H02M; H02M7/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
133 words
A generator/starter system for starting an engine and for tapping power from the engine in order to generate electricity comprising: a squirrel cage rotor so as to provide an AC output in response to rotation of the squirrel cage rotor and so as to rotate the squirrel cage rotor in response to an AC input; an auxiliary stator winding magnetically coupled to the squirrel cage rotor so as to excite the main stator winding; a source of excitation current coupled to the auxiliary stator winding; a rectifier coupled to the main stator winding, wherein the rectifier is arranged to rectify a variable frequency AC output from the main stator winding to DC; and, an inverter coupled to the rectifier, wherein the inverter is arranged to invert the DC from the rectifier to AC.
Claim 2
Dependent Claim
133 words
A generator/starter system for starting an engine and for tapping power from the engine in order to generate electricity comprising: a squirrel cage rotor so as to provide an AC output in response to rotation of the squirrel cage rotor and so as to rotate the squirrel cage rotor in response to an AC input; an auxiliary stator winding magnetically coupled to the squirrel cage rotor so as to excite the main stator winding; a source of excitation current coupled to the auxiliary stator winding; a rectifier coupled to the main stator winding, wherein the rectifier is arranged to rectify a variable frequency AC output from the main stator winding to DC; and, an inverter coupled to the rectifier, wherein the inverter is arranged to invert the DC from the rectifier to AC.
Claim 3
Dependent Claim
38 words
The generator/starter system of claim 1 wherein the inverter is a first inverter, and wherein the source of excitation current comprises a second inverter having a DC input and an AC output coupled to the auxiliary stator winding.
Claim 4
Dependent Claim
19 words
The generator/starter system of claim 2 wherein the second inverter further includes a capacitor coupled to the DC input.
Claim 5
Dependent Claim
46 words
The generator/starter system of claim 2 wherein the second inverter further includes a PMG generator having a permanent magnet coupled to the squirrel cage rotor, a PMG winding magnetically coupled to the permanent magnet, and a rectifier coupled between the PMG winding and the DC input.
Claim 6
Dependent Claim
38 words
The generator/starter system of claim 1 further comprising: an AC bus coupled to the AC output of the inverter; and, a switch coupling an AC output of the inverter to the AC output of the main stator winding.
Claim 7
Dependent Claim
29 words
The generator/starter system of claim 1 wherein the source of excitation current comprises an inverter having a DC input and an AC output coupled to the auxiliary stator winding.
Claim 8
Dependent Claim
18 words
The generator/starter system of claim 6 wherein the inverter further includes a capacitor coupled to the DC input.
Claim 9
Dependent Claim
45 words
The generator/starter system of claim 7 wherein the inverter further includes a PMG generator having a permanent magnet coupled to the squirrel cage rotor, a PMG winding magnetically coupled to the permanent magnet, and a rectifier coupled between the PMG winding and the DC input.
Claim 10
Dependent Claim
44 words
The generator/starter system of claim 6 wherein the inverter further includes a PMG generator having a permanent magnet coupled to the squirrel cage rotor, PMG winding magnetically coupled to the permanent magnet, and a rectifier coupled between the PMG winding and the DC input.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-10-07 | 2006-04-08 | 2006-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-10-07 | 2010-04-08 | 2010-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-10-07 | 2014-04-08 | 2014-10-08 | $7700.00 | Window Closed / Lapsed |