US4885494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor and motor device
Assignee: Mitsubishi Electric Corp
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Filing: 1988-11-17
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Granted: 1989-12-05
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Expires: 2008-11-17
Abstract
Abstract This invention relates to a motor and a motor apparatus and is so constructed that end rings and bars composing a squirrel cage rotor of the motor are formed in a hollow or grooved shape and superconductive materials are filled within said end rings and bars to form looped circuits, which are symmetrical relative to a center line of a field, of a number equal to a number of poles, by the superconductive materials filled in each two bars and both end rings, so that the motor exhibits starting characteristics similar to those in an induction motor using a squirrel cage rotor composed of usual conductors by starting in an atmosphere of room temperature, and the operational characteristics as a very highly efficient synchronous motor by cooling the rotor to a critical temperature or less of the superconductive material after starting a permanent direct current flows through field windings composed of the superconductive materials.
Inventors
- 👤 Kazuhiko Higashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:21
CPC Classifications
H; H02; H02K; H02K9/00; H02K9/19; H02K55/00; H02K55/02; H02K55/04; H02K9/10; H02K9/12; Y; Y02; Y02E; Y02E40/00; Y02E40/60
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
107 words
A motor being provided with a squirrel cage rotor comprising a plurality of bar conductors short-circuited by two opposite circular conductors at respective both ends thereof, wherein said squirrel cage rotor has spaces, in which superconductive materials are filled, at each said bar conductor and each said circular conductor, respective pair of bar conductors being electrically connected to both circular conductors so that the superconductive materials filled in the respective bar conductors and circular conductors may form looped circuits, which are symmetrical relative to a center line of a magnetic pole of said squirrel cage rotor, of a number equal to a number of the magnetic poles.
Claim 2
Dependent Claim
107 words
A motor being provided with a squirrel cage rotor comprising a plurality of bar conductors short-circuited by two opposite circular conductors at respective both ends thereof, wherein said squirrel cage rotor has spaces, in which superconductive materials are filled, at each said bar conductor and each said circular conductor, respective pair of bar conductors being electrically connected to both circular conductors so that the superconductive materials filled in the respective bar conductors and circular conductors may form looped circuits, which are symmetrical relative to a center line of a magnetic pole of said squirrel cage rotor, of a number equal to a number of the magnetic poles.
Claim 3
Dependent Claim
23 words
A motor as set forth in claim 1, in which said spaces comprise hollow portions formed in said bar conductors and circular conductors.
Claim 4
Dependent Claim
20 words
A motor as set forth in claim 1, in which said spaces comprise grooved portions formed in said circular conductors.
Claim 5
Dependent Claim
19 words
A motor as set forth in claim 1, in which said superconductive materials are ceramic materials of Y-Ba-Cu-O derivative.
Claim 6
Dependent Claim
140 words
A motor apparatus being provided with a motor which has a squirrel cage rotor comprising a plurality of bar conductors short-circuited by two opposite circular conductors at respective both ends thereof, wherein said motor is a hermetic type one, said squirrel cage rotor has spaces, in which superconductive materials are filled, at each said bar conductor and each said circular conductor, respective pairs of bar conductors being electrically connected to both circular conductors so that the superconductive materials filled in the respective bar conductors and circular conductors are able to form looped circuits, which are symmetrical relative to a center line of a magnetic pole of said squirrel cage rotor, of a number equal to a number of the magnetic poles, and further comprising a cooling means for cooling an inside of said hermetic type motor by a gaseous coolant.
Claim 7
Dependent Claim
140 words
A motor apparatus being provided with a motor which has a squirrel cage rotor comprising a plurality of bar conductors short-circuited by two opposite circular conductors at respective both ends thereof, wherein said motor is a hermetic type one, said squirrel cage rotor has spaces, in which superconductive materials are filled, at each said bar conductor and each said circular conductor, respective pairs of bar conductors being electrically connected to both circular conductors so that the superconductive materials filled in the respective bar conductors and circular conductors are able to form looped circuits, which are symmetrical relative to a center line of a magnetic pole of said squirrel cage rotor, of a number equal to a number of the magnetic poles, and further comprising a cooling means for cooling an inside of said hermetic type motor by a gaseous coolant.
Claim 8
Dependent Claim
24 words
A motor apparatus as set forth in claim 5, in which said spaces comprise hollow portions formed in said bar conductors and circular conductors.
Claim 9
Dependent Claim
21 words
A motor apparatus as set forth in claim 5, in which said spaces comprise grooved portions formed in said circular conductors.
Claim 10
Dependent Claim
20 words
A motor apparatus as set forth in claim 5, in which said superconductive materials are ceramic materials of Y-Ba-Cu-O derivative.
Claim 11
Dependent Claim
140 words
A motor apparatus being provided with a motor which has a squirrel cage rotor comprising a plurality of bar conductors short-circuited by two opposite circular conductors at respective both ends thereof, wherein said motor is a canned type one, said squirrel cage rotor has spaces, in which superconductive materials are filled, at each said bar conductor and each said circular conductor, and respective pairs of bar conductors being electrically connected to both circular conductors so that the superconductive materials filled in the respective bar conductors and circular conductors are able to form looped circuits, which are symmetrical relative to a center line of a magnetic pole of said squirrel cage rotor, of a number equal to a number of the magnetic poles, and further comprising a cooling means for cooling an inside of said canned type motor by a coolant.
Claim 12
Dependent Claim
140 words
A motor apparatus being provided with a motor which has a squirrel cage rotor comprising a plurality of bar conductors short-circuited by two opposite circular conductors at respective both ends thereof, wherein said motor is a canned type one, said squirrel cage rotor has spaces, in which superconductive materials are filled, at each said bar conductor and each said circular conductor, and respective pairs of bar conductors being electrically connected to both circular conductors so that the superconductive materials filled in the respective bar conductors and circular conductors are able to form looped circuits, which are symmetrical relative to a center line of a magnetic pole of said squirrel cage rotor, of a number equal to a number of the magnetic poles, and further comprising a cooling means for cooling an inside of said canned type motor by a coolant.
Claim 13
Dependent Claim
17 words
A motor apparatus as set forth in claim 9, in which said coolant is a liquid coolant.
Claim 14
Dependent Claim
24 words
A motor apparatus as set forth in claim 9, in which said spaces comprise hollow portions formed in said bar conductors and circular conductors.
Claim 15
Dependent Claim
21 words
A motor apparatus as set forth in claim 9, in which said spaces comprise grooved portions formed in said circular conductors.
Claim 16
Dependent Claim
20 words
A motor apparatus as set forth in claim 9, in which said superconductive materials are ceramic materials of Y-Ba-Cu-O derivative.
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) | 1992-12-04 | 1993-06-05 | 1993-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-12-04 | 1997-06-05 | 1997-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-12-04 | 2001-06-05 | 2001-12-05 | $7700.00 | Window Closed / Lapsed |