Patent US4350003A successfully refreshed from Google Patents.
US4110643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Induction motor
Assignee: Individual
•
Filing: 1976-08-24
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Granted: 1978-08-29
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Expires: 1996-08-24
Abstract
Abstract Variable-speed electric induction motors are known with a closed fluid-flow circuit for coolant liquid driven by a pump operated by the motor. A disadvantage is that the coolant flow varies with speed of the motor. The improvement is that the motor has an ancillary shaft which drives the coolant pump and which is rotated at constant speed irrespective of the speed of the main drive rotor of the motor. The ancillary shaft may be driven by an ancillary rotor cooperating with the main stator of the motor. There may also be provided a coolant fan driven at constant speed, for example by the ancillary shaft and preferably through a releasable clutch.
Inventors
- 👤 Arnold Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:09
CPC Classifications
H; H02; H02K; H02K9/00; H02K9/19
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
93 words
In a variable-speed electric induction motor, of that kind having a stator and a rotor, and means defining a hermetically sealed liquid flow circuit including internal space of the motor, a coolant liquid in said liquid flow circuit, and a pump located in said liquid flow circuit for pumping said coolant liquid in said liquid flow circuit, the improvement which comprises a free-running ancillary shaft, and drive means independent of the rotor of the motor for rotating said ancillary shaft at constant speed, said pump being coupled for driving to said ancillary shaft.
Claim 2
Dependent Claim
93 words
In a variable-speed electric induction motor, of that kind having a stator and a rotor, and means defining a hermetically sealed liquid flow circuit including internal space of the motor, a coolant liquid in said liquid flow circuit, and a pump located in said liquid flow circuit for pumping said coolant liquid in said liquid flow circuit, the improvement which comprises a free-running ancillary shaft, and drive means independent of the rotor of the motor for rotating said ancillary shaft at constant speed, said pump being coupled for driving to said ancillary shaft.
Claim 3
Dependent Claim
31 words
A variable-speed electric induction motor, as claimed in claim 1, wherein said rotating means is an ancillary rotor cooperating with the motor stator and coupled to and driving said ancillary shaft.
Claim 4
Dependent Claim
23 words
A variable-speed electric induction motor, as claimed in claim 1, further comprising a fan, and means for driving said fan at constant speed.
Claim 5
Dependent Claim
21 words
A variable-speed electric induction motor, as claimed in claim 1, further comprising a fan coupled for driving to said ancillary shaft.
Claim 6
Dependent Claim
28 words
A variable-speed electric induction motor, as claimed in claim 1, further comprising a fan, and a clutch providing releasable driving connection between said ancillary shaft and said fan.
Claim 7
Dependent Claim
56 words
A variable-speed electric induction motor, as claimed in claim 4, wherein said means defining a hermetically sealed liquid flow circuit includes a heat-exchanger, said heat-exchanger being arranged outside of said internal space of the motor and adjacent said fan such that air flow is provided from the fan through the heat-exchanger for cooling said coolant liquid.
References Cited (Backward Citations)
US953219A
Cited
US2657322A
Cited
US2844101A
Cited
US2922098A
Cited
US3456141A
Cited
US3749949A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-08-28 | 1982-02-27 | 1982-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-28 | 1986-02-27 | 1986-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-28 | 1990-02-27 | 1990-08-29 | $7700.00 | Window Closed / Lapsed |