Patent US3566226A successfully refreshed from Google Patents.
US3566226A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single-phase operation of three-phase motor
Assignee: ABB Motors and Mechanical Inc
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Filing: 1969-08-25
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Granted: 1971-02-23
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Expires: 1989-08-25
Abstract
Abstract Three-phase alternating current motor with Y-connected windings adapted to operate on single-phase source by disconnecting one leg of Y from other two legs, connecting the disconnected leg in series with a running capacitance across the single phase supply, connecting said two legs in series with a shuntable inductance across said supply. The coils of two voltage-sensitive relays for respectively shunting said shuntable inductance, and disconnecting a starting capacitance, each at different motor speeds, are connected in parallel with the aforesaid disconnected leg of the motor winding.
Inventors
- 👤 Emil S Tamm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:16
CPC Classifications
H; H02; H02P; H02P1/00; H02P1/16; H02P1/26
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
236 words
In an electric motor having a rotor, a stator, three groups of stator windings, the windings of the different groups being disposed in 120* space position, and an array of leads each connected to one end of an individual one of said stator windings, each lead being optionally connectable to another lead to interconnect said windings according to one of: a. a three-phase operating system wherein an end of each group is connected to a different phase conductor of a three-phase source; and b. a single phase operating system wherein an end of one group is connected directly to one pole of a single-phase source and the other end connected through a permanently connected capacitance to the opposite pole of said single-phase source, an end of another group is connected through a selectively shuntable reactance to the opposite pole of said single-phase source, and an end of the third group is connected between the opposite end of said another group and said one pole; means for reducing the starting current when said windings are connected per (b) including a circuit having in shunt with the group connected to the capacitance: c. the coil of a relay for shunting said selectively shuntable reactance when said rotor has reached a predetermined speed; and d. the coil of a relay for disconnecting part of said capacitance when said rotor has reached a predetermined speed different from that in (c).
Claim 2
Dependent Claim
236 words
In an electric motor having a rotor, a stator, three groups of stator windings, the windings of the different groups being disposed in 120* space position, and an array of leads each connected to one end of an individual one of said stator windings, each lead being optionally connectable to another lead to interconnect said windings according to one of: a. a three-phase operating system wherein an end of each group is connected to a different phase conductor of a three-phase source; and b. a single phase operating system wherein an end of one group is connected directly to one pole of a single-phase source and the other end connected through a permanently connected capacitance to the opposite pole of said single-phase source, an end of another group is connected through a selectively shuntable reactance to the opposite pole of said single-phase source, and an end of the third group is connected between the opposite end of said another group and said one pole; means for reducing the starting current when said windings are connected per (b) including a circuit having in shunt with the group connected to the capacitance: c. the coil of a relay for shunting said selectively shuntable reactance when said rotor has reached a predetermined speed; and d. the coil of a relay for disconnecting part of said capacitance when said rotor has reached a predetermined speed different from that in (c).
Claim 3
Dependent Claim
49 words
The motor of claim 1 wherein the relays referred to in (c) and (d) are each voltage-sensitive, and the relay of (c) is calibrated to actuate its contacts when the speed of the motor rotor has attained a value higher than that required to actuate the relay of (d).
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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |