US3746979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring the insulation resistance of the rotor of a brushless synchronous machine
Assignee: Individual
•
Filing: 1971-07-08
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Granted: 1973-07-17
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Expires: 1991-07-08
Abstract
Abstract An apparatus is provided for measuring the insulation resistance of, and the voltage across, the rotor of a brushless synchronous machine. The apparatus is characterized in that the rotor of the synchronous machine is coupled to an insulation-resistance measuring unit via a synchronous generator with a rotary rectifier and an exciter, such that the field winding of the synchronous generator together with the rotary rectifier and the armature winding of the exciter are series-connected between the zero-potential datum point of the rotor of the synchronous machine and the rotor frame. The rotary rectifier is shunted with resistors. A supply source in measuring the insulative resistance is connected, in one of the various positions of a switch, to the inductor winding of the excitor. The meter of the insulationresistance measuring unit is connected in separate positions of the switch to the armature winding of the synchronous generator and the inductor winding of the exciter, while, in the brake-down alarm position of a switch, the meter is connected to the armature winding of the synchronous generator.
Inventors
- 👤 A Lebedev
- 👤 N Maznikin
- 👤 A Misjulin
- 👤 V Kildishev
- 👤 G Kovalkov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:50
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/34; G01R31/343; G01R27/00; G01R27/02; G01R27/025
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
272 words
An apparatus for measuring the insulation resistance of a brushless synchronous machine including a rotor and a frame supporting said rotor, said rotor having a zero-potential (datum) point, said apparatus comprising: an insulation resistance measuring unit including a switch and a meter, said switch having a plurality of positions; a supply source; a coupling unit connecting the rotor of said synchronous machine to said insulation resistance measuring unit; a rotary rectifier; said coupling unit including a measuring synchronous generator and a measuring exciter connected for rotation with said synchronous machine; said measuring exciter including an armature winding and a stationary winding; said measuring synchronous generator including a rotating field winding fed from the armature winding of said measuring exciter through said rotary rectifier, said measuring synchronous rotating field winding also including a stationary winding; said field winding of said measuring synchronous generator and said rotary rectifier being connected between the zeropotential (datum) point of the rotor of said synchronous machine and the frame of said rotor; said rotary rectifier including a plurality of diodes and resistors shunting at least some of the diodes of said rotary rectifier; said supply source being connected to the stationary winding of said measuring exciter, the meter of said measuring unit being connected to the stationary winding of said measuring synchronous generator with said switch correspondingly positioned in an insulation resistance measuring position; said meter, with said supply source disconnected, being connected to one of the windings of said measuring synchronous generator with said switch in insulation breakdown signalling position or to the winding of the inductor of said measuring exciter in other positions of said switch.
Claim 2
Independent Claim
272 words
An apparatus for measuring the insulation resistance of a brushless synchronous machine including a rotor and a frame supporting said rotor, said rotor having a zero-potential (datum) point, said apparatus comprising: an insulation resistance measuring unit including a switch and a meter, said switch having a plurality of positions; a supply source; a coupling unit connecting the rotor of said synchronous machine to said insulation resistance measuring unit; a rotary rectifier; said coupling unit including a measuring synchronous generator and a measuring exciter connected for rotation with said synchronous machine; said measuring exciter including an armature winding and a stationary winding; said measuring synchronous generator including a rotating field winding fed from the armature winding of said measuring exciter through said rotary rectifier, said measuring synchronous rotating field winding also including a stationary winding; said field winding of said measuring synchronous generator and said rotary rectifier being connected between the zeropotential (datum) point of the rotor of said synchronous machine and the frame of said rotor; said rotary rectifier including a plurality of diodes and resistors shunting at least some of the diodes of said rotary rectifier; said supply source being connected to the stationary winding of said measuring exciter, the meter of said measuring unit being connected to the stationary winding of said measuring synchronous generator with said switch correspondingly positioned in an insulation resistance measuring position; said meter, with said supply source disconnected, being connected to one of the windings of said measuring synchronous generator with said switch in insulation breakdown signalling position or to the winding of the inductor of said measuring exciter in other positions of said switch.
Claim 3
Dependent Claim
112 words
An apparatus as claimed in claim 1 comprising a further diode and wherein the field winding of the measurIng synchronous generator is shunted by said further diode which is connected in opposition to the rotary rectifier, the meter of said measuring unit being a center-zero meter and being connected in one of the positions of said switch to the like terminals of two rectifiers included by the measuring unit in series-opposing connection and shunted by resistors included by said unit; one of said rectifiers of the measuring unit being connected to one of said windings of said measuring synchronous generator, and the other to one of said windings of said measuring exciter.
Claim 4
Dependent Claim
59 words
An apparatus as claimed in claim 1 wherein the rotor circuit of said brushless synchronous machine includes an induction voltage measuring unit comprising: a rotating inductor winding; a stationary armature winding; said rotating inductor winding of said induction voltage measuring unit including a center tap constituting the zero-potential (datum) point of the rotor circuit of said brushless synchronous machine.
Claim 5
Dependent Claim
41 words
An apparatus as claimed in claim 3 wherein said armature winding of said induction voltage measuring unit is a three-phase two or four layer winding including end connections placed in one plane perpendicular to the axis of rotation of said rotor.
References Cited (Backward Citations)
US3303410A
Cited
US3593123A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |