US3993920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coreless motor
Assignee: Olympus Corp
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Filing: 1975-07-14
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Granted: 1976-11-23
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Expires: 1995-07-14
Abstract
Abstract A coreless motor comprises a motor housing having a bearing, a rotor mounted within the housing, rotatably supported within the bearing and having a plurality of coils constituting a pancake coil, a permanent magnet stator mounted within the housing and disposed opposite to the rotor, in which the stator is arranged opposite to an effective coil section of the pancake coil and thus the rotor, and an annular spacing is formed opposite to an outer peripheral portion other than the effective coil section of the rotor so that a balance adjusting member for the rotor as well as an electrical part associated with the coreless motor can be provided in the annular spacing within the motor housing.
Inventors
- 👤 Masaaki Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:31
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/288; H02P7/2885; H02K; H02K23/00; H02K23/54; H02K23/56; H02K7/00; H02K7/04
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
123 words
A coreless motor comprisng a motor housing having a bearing, a rotor mounted within the housing, rotatably supported within the bearing and having a plurality of coil units attached on a rotor substrate, said plurality of coil units constituting a pancake coil, and a permanent magnet stator mounted within the housing and disposed opposite to the rotor, in which said stator is arranged opposite to an effective coil section of said pancake coil and thus said rotor and an annular spacing are formed opposite to an outer peripheral portion other than said effective coil section of said rotor so that a balance adjusting member for said rotor and an electrical part associated with said coreless motor can be provided within said annular spacing.
Claim 2
Dependent Claim
123 words
A coreless motor comprisng a motor housing having a bearing, a rotor mounted within the housing, rotatably supported within the bearing and having a plurality of coil units attached on a rotor substrate, said plurality of coil units constituting a pancake coil, and a permanent magnet stator mounted within the housing and disposed opposite to the rotor, in which said stator is arranged opposite to an effective coil section of said pancake coil and thus said rotor and an annular spacing are formed opposite to an outer peripheral portion other than said effective coil section of said rotor so that a balance adjusting member for said rotor and an electrical part associated with said coreless motor can be provided within said annular spacing.
Claim 3
Dependent Claim
36 words
A coreless motor according to claim 1, in which a plurality of balance weights are provided substantially at equal intervals on that outer peripheral portion of said rotor which confronts said annular spacing within said housing.
Claim 4
Dependent Claim
49 words
A coreless motor according to claim 1, in which an annular balance weight capable of being cutting off at any suitable place for balance adjustment is provided on that outer peripheral portion other than said effective coil section of said rotor which confronts said annular spacing within said housing.
Claim 5
Dependent Claim
56 words
A coreless motor according to claim 1, in which an annular plural-pole magnetic material is attached on that outer peripheral portion other than said effective coil section of said rotor which confronts said annular spacing within said housing, and a pickup coil is attached on that inner surface of said housing which confronts said magnetic material.
Claim 6
Dependent Claim
60 words
A coreless motor according to claim 1, in which a striped annular member is attached on that outer peripheral portion other than said effective coil section of said rotor which confronts said annular spacing within said housing, and a lamp and photoelectric element are attached on that inner surface of the housing which confronts said annular spacing within said housing.
Claim 7
Dependent Claim
30 words
A coreless motor according to claim 1, in which said rotor is mounted on a rotor shaft integral with a pulley as an output transmission section of said coreless motor.
Claim 8
Dependent Claim
30 words
A coreless motor according to claim 1, in which said rotor is mounted on a rotor shaft integral with a gear as an output transmission section of said coreless motor.
Claim 9
Dependent Claim
29 words
A coreless motor according to claim 6, in which at least that part of said rotor shaft which contacts with a bearing can be made of an oilless material.
Claim 10
Dependent Claim
29 words
A coreless motor according to claim 6, in which at least that part of said rotor shaft which confronts with a bearing can be made of an oilless material.
Claim 11
Dependent Claim
26 words
A coreless motor according to claim 1, in which a magnetic material is attached on said rotor so as to maintain thrust in a predetermined direction.
Claim 12
Dependent Claim
21 words
A coreless motor according to claim 10, in which a magnetic powder is added to an insulating substrate of said rotor.
Claim 13
Dependent Claim
32 words
A coreless motor according to claim 10, in which said rotor is of a cup type and a magnetic material is attached on the inner bottom surface of said cup type rotor.
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) | 1979-11-23 | 1980-05-24 | 1980-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-23 | 1984-05-24 | 1984-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-23 | 1988-05-24 | 1988-11-23 | $7700.00 | Window Closed / Lapsed |