Patent US4535377A successfully refreshed from Google Patents.
US4535377A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaft voltage suppression circuit
Assignee: General Electric Co
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Filing: 1984-03-28
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Granted: 1985-08-13
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Expires: 2004-03-28
Abstract
Abstract A shaft voltage suppression circuit is used with electrical motors or generators of the type including a field winding supported by a shaft which is movable within bearings, which motor or generator is supplied by way of relatively positive and negative buses with electrical power from a source including an electrical power conversion bridge having controlled rectifiers and uncontrolled rectifiers. The shaft voltage suppression circuit includes a first series combination of a first resistor and a first capacitor connected between the positive bus and a common voltage. A second series combination of a second resistor and a second capacitor is connected between the negative bus and the same common voltage and a unidirectional current conductor is connected in parallel with the second resistor such that there is established a low resistance path for current to pass from the negative bus to the common voltage.
Inventors
- 👤 Lawrence J. Lane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:10
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/06; H02K; H02K11/00; H02K11/40; H02K19/00; H02K19/16; H02K19/36
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
175 words
For use with electric motors and generators, of the type including a field winding supported by a shaft which is movable within bearings, which is supplied by way of relative positive and negative buses with electrical power from a source including an electrical power conversion bridge having controlled rectifiers and uncontrolled rectifiers, circuit means for suppressing voltages coupled to said shaft from said field winding, said circuit means comprising: (a) a first series combination of a first resistor and a first capacitor connected between said positive bus and a common voltage; (b) a second series combination of a second resistor and a second capacitor connected between said negative bus and said common voltage; and, (c) means associated with said second series combination to establish a low impedance path including said second capacitor for currents flowing from the negative bus to the common voltage and a path having a high impedance relative to said low impedance path including said second resistor and said second capacitor for currents flowing from said common voltage to said negative bus.
Claim 2
Dependent Claim
175 words
For use with electric motors and generators, of the type including a field winding supported by a shaft which is movable within bearings, which is supplied by way of relative positive and negative buses with electrical power from a source including an electrical power conversion bridge having controlled rectifiers and uncontrolled rectifiers, circuit means for suppressing voltages coupled to said shaft from said field winding, said circuit means comprising: (a) a first series combination of a first resistor and a first capacitor connected between said positive bus and a common voltage; (b) a second series combination of a second resistor and a second capacitor connected between said negative bus and said common voltage; and, (c) means associated with said second series combination to establish a low impedance path including said second capacitor for currents flowing from the negative bus to the common voltage and a path having a high impedance relative to said low impedance path including said second resistor and said second capacitor for currents flowing from said common voltage to said negative bus.
Claim 3
Dependent Claim
34 words
The invention in accordance with claim 1 wherein said means associated with said second series combination includes a unidirectional current carrying device poled to conduct current from said negative bus to said common voltage.
Claim 4
Dependent Claim
16 words
The invention in accordance with claim 2 wherein said unidirectional current carrying device comprises a diode.
Claim 5
Dependent Claim
18 words
The invention in accordance with claim 3 wherein said diode is connected in parallel with said second resistor.
Claim 6
Dependent Claim
14 words
The invention in accordance with claim 1 wherein said common voltage is earth ground.
Claim 7
Dependent Claim
14 words
The invention in accordance with claim 2 wherein said common voltage is earth ground.
Claim 8
Dependent Claim
14 words
The invention in accordance with claim 3 wherein said common voltage is earth ground.
Claim 9
Dependent Claim
19 words
The invention in accordance with claim 1 further including a diode connected in electrical parallel with said field winding.
Claim 10
Dependent Claim
26 words
The invention in accordance with claim 1 wherein the series arrangement of said first and second series combinations is connected in parallel with said field winding.
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) | 1988-08-12 | 1989-02-11 | 1989-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-12 | 1993-02-11 | 1993-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-12 | 1997-02-11 | 1997-08-13 | $7700.00 | Window Closed / Lapsed |