Patent US2807848A successfully refreshed from Google Patents.
Patent US4833873A successfully refreshed from Google Patents.
US4833873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spindle apparatus directly driven by electric motor
Assignee: Hitachi Ltd
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Filing: 1988-08-24
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Granted: 1989-05-30
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Expires: 2008-08-24
Abstract
Abstract A spindle apparatus for winding fibers has a spindle which is directly fixed to a rotor of an electric motor. One of a pair of magnetically-coupled thrusting members is fixed to a rotary part of the apparatus, while the other of the thrusting members is fixed to a stationary part of the apparatus, so that a downward thrusting force is applied to the spindle to prevent lift of the spindle during rotation thereof.
Inventors
- 👤 Hideaki Kobayashi
- 👤 Takeshi Obata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:23
CPC Classifications
D; D01; D01H; D01H1/00; D01H1/14; D01H1/20; D01H1/24; D01H1/244; B; B65; B65H; B65H54/00; B65H54/70; B65H54/74; B65H2701/00; B65H2701/30; B65H2701/31
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
171 words
A spindle apparatus of the type that is directly driven by an electric motor, comprising: a blade rotatably supported by an insert bearing; a cylindrical wharve having an upper end fixed to said blade and a lower end which opens downwards; an electric motor having a rotor fixed to a lower portion of the outer peripheral surface of said wharve and rotatable about a vertical axis and a stator carrying a stator winding and facing said rotor across an air gap, said stator being adapted to be excited by an electric current supplied to said stator winding to cause said rotor to rotate about said vertical axis; and thrust generating means including a pair of thrusting members which are magnetically coupled to each other, one of said thrusting members being fixed to a rotary part of said spindle apparatus while the other is fixed to a stationary art of said spindle apparatus so that said thrusting members magnetically interact with each other to supply a downward thrust force to said blade.
Claim 2
Dependent Claim
171 words
A spindle apparatus of the type that is directly driven by an electric motor, comprising: a blade rotatably supported by an insert bearing; a cylindrical wharve having an upper end fixed to said blade and a lower end which opens downwards; an electric motor having a rotor fixed to a lower portion of the outer peripheral surface of said wharve and rotatable about a vertical axis and a stator carrying a stator winding and facing said rotor across an air gap, said stator being adapted to be excited by an electric current supplied to said stator winding to cause said rotor to rotate about said vertical axis; and thrust generating means including a pair of thrusting members which are magnetically coupled to each other, one of said thrusting members being fixed to a rotary part of said spindle apparatus while the other is fixed to a stationary art of said spindle apparatus so that said thrusting members magnetically interact with each other to supply a downward thrust force to said blade.
Claim 3
Dependent Claim
63 words
A spindle apparatus according to claim 1, wherein one of said thrusting members is formed by said rotor which is so disposed that the axial center thereof is offset upwardly from the axial center of said stator which serves as said the other thrusting member, whereby said rotor is magnetically attracted downwardly by the magnetic force acting between said rotor and said stator.
Claim 4
Dependent Claim
47 words
A spindle apparatus according to claim 1, wherein at least one of said pair of thrusting members is formed by a permanent magnet and said thrusting members are arranged to oppose each other in the axial direction of said apparatus with an axial air gap left therebetween.
Claim 5
Dependent Claim
63 words
A spindle apparatus according to claim 1, wherein one of said thrusting members is formed by the upper coil end of said stator winding having an upwardly diverging inner peripheral surface, while the other of said thrusting members comprises a magnetic disk secured to said wharve and having upwardly diverging outer peripheral surface facing said inner peripheral surface of said upper coil end.
Claim 6
Dependent Claim
54 words
A spindle apparatus according to claim 1, wherein one of said thrusting members is formed by said rotor of said electric motor while the other of said thrusting members comprises said stator of said electric motor, said rotor and said stator being so arranged that an upwardly diverging frusto-conical air gap is defined therebetween.
Claim 7
Dependent Claim
60 words
A spindle apparatus according to claim 1, wherein one of said thrusting members is formed by a lower end ring of a secondary conductor of said rotor, while the other of said thrusting members comprises a ferromagnetic hollow member secured to said stationary part in such a manner as to oppose the inner peripheral surface of said lower end ring.
Claim 8
Dependent Claim
31 words
A spindle apparatus according to claim 6, wherein said hollow member comprises said insert bearing a portion of which is shaped to extend radially outward in the form like a flange.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-05-29 | 1992-11-28 | 1993-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-29 | 1996-11-28 | 1997-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-29 | 2000-11-28 | 2001-05-30 | $7700.00 | Window Closed / Lapsed |