Patent US3617857A successfully refreshed from Google Patents.
US3617857A
Expired / Lapsed
US
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Voltage regulator for brushless alternator
Assignee: Motorola Solutions Inc
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Filing: 1970-05-26
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Granted: 1971-11-02
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Expires: 1990-05-26
Abstract
Abstract A voltage regulator for brushless alternators including an oscillator circuit which has the output thereof fed into a stationary, primary winding of a rotary transformer device which, in turn, has a secondary winding thereof rotatable with the rotor shaft of the alternator. The oscillator is a free running oscillator at substantially a fixed frequency and the output of the alternator is fed back to a voltage sensor circuit which, in turn controls the oscillator between fully on and fully off conditions to regulate the output therefrom to the primary winding of the rotary transformer thereby regulating the power output of the alternator.
Inventors
- 👤 Philip D Gunderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:24
CPC Classifications
H; H02; H02J; H02J7/00; H02J7/14; H02J7/16; H02J7/24
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
177 words
A voltage regulator for a brushless alternator having a rotor and a stator comprising, in combination: a first fixed winding of a rotary transformer, the second winding of which is rotatable by the rotor shaft of the alternator to which a voltage output is to be regulated; an oscillator circuit for applying predetermined frequency output signals to said first fixed winding to transformer couple said output signal into the rotatable second winding thereof; means for inducing a magnetic field within the alternator stator in response to said output signal being transformer coupled into the rotatable second winding; voltage sensing circuit means connected to the output of the alternator to sense the voltage value thereof; and a semicoNductor switching means connected between said voltage sensing circuit means and said oscillator circuit to control said oscillator circuit between fully on and fully off conditions at a repetition rate less than said predetermined frequency in accordance with the load requirements sensed at the output of the alternator, thereby producing a substantially constant output voltage at the output of the alternator.
Claim 2
Dependent Claim
177 words
A voltage regulator for a brushless alternator having a rotor and a stator comprising, in combination: a first fixed winding of a rotary transformer, the second winding of which is rotatable by the rotor shaft of the alternator to which a voltage output is to be regulated; an oscillator circuit for applying predetermined frequency output signals to said first fixed winding to transformer couple said output signal into the rotatable second winding thereof; means for inducing a magnetic field within the alternator stator in response to said output signal being transformer coupled into the rotatable second winding; voltage sensing circuit means connected to the output of the alternator to sense the voltage value thereof; and a semicoNductor switching means connected between said voltage sensing circuit means and said oscillator circuit to control said oscillator circuit between fully on and fully off conditions at a repetition rate less than said predetermined frequency in accordance with the load requirements sensed at the output of the alternator, thereby producing a substantially constant output voltage at the output of the alternator.
Claim 3
Dependent Claim
34 words
The voltage regulator of claim 1 wherein said semiconductor switching means includes a high gain switching transistor which is switched to a highly conductive condition at a desired voltage value to disable the oscillator.
Claim 4
Dependent Claim
29 words
The voltage regulator of claim 1 wherein said first fixed winding is a center tapped primary winding, and said second winding is a secondary winding of the rotary transformer.
Claim 5
Dependent Claim
140 words
The voltage regulator of claim 3 wherein said oscillator circuit includes first transistor means connected to one end of said primary winding to cause current flow to pass through one-half of said primary winding during one instance and second transistor means connected to the other end of said primary winding to cause current flow to pass through the other half of said primary winding during another instance, each condition of current flow being alternate with one another; stationary transformer means including a primary winding connected across said center tapped primary winding of said rotary transformer with secondary windings of said stationary transformer coupled back to said transistor means to provide self-sustained oscillations; and high gain switching transistors connected to the input of each of said transistor means to disable said transistor means upon sensing a predetermined output at the alternator.
Claim 6
Dependent Claim
23 words
The voltage regulator of claim 4 wherein said high gain switching transistors are rendered conductive simultaneously in response to a voltage sensing transistor.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |