US3988658A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic drive assembly for rotary bodies using a magnetically mounted rotor
Assignee: MAN AG
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Filing: 1974-07-29
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Granted: 1976-10-26
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Expires: 1994-07-29
Abstract
Abstract An electromagnetic drive for rotary bodies including a stationary member having at least two coils and a revolving member arranged for rotation with respect thereto. The coils are supplied with a current signal for causing rotation of the revolving member and a sensing arrangement senses the position of the revolving member with respect to the stationary member and provides an output indicative thereof. A control device is responsive to the output of sensing arrangement for supplying an additional current signal to the coils effect positional control of the revolving member.
Inventors
- 👤 Peter Meinke
- 👤 Gerhard Flachenecker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:04
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/04; F16C32/0406; F16C32/044; F16C32/0459; F16C32/0461; F16C32/0444; F16C32/0474; F16C32/0493; H; H02; H02K; H02K7/00; H02K7/08; H02K7/09; F16C2380/00; F16C2380/26; Y; Y10; Y10T; Y10T74/00; Y10T74/12; Y10T74/1229; Y10T74/1232; Y10T74/125
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
153 words
An electromagnetic drive assembly comprising a stationary member and a rotatable member of a magnetizable material, one of said stationary and rotatable members being disposed within the other of said stationary and rotatable members, said stationary member being provided with at least two coil means for simultaneously producing a rotating magnetic field for driving said rotatable member and a nonrotating magnetic field for positioning said rotatable member relative to said stationary member, each of said coil means being supplied with a first current therethrough for producing the rotating magnetic field and a second current through at least a portion thereof supperimposed on the first current for producing the nonrotating magnetic field, sensing means for sensing the spacing between said stationary and rotatable members and providing an output indicative thereof, and control means for varying the second current and thereby the nonrotating field for maintaining a predetermined spacing between said stationary and rotatable members.
Claim 2
Dependent Claim
153 words
An electromagnetic drive assembly comprising a stationary member and a rotatable member of a magnetizable material, one of said stationary and rotatable members being disposed within the other of said stationary and rotatable members, said stationary member being provided with at least two coil means for simultaneously producing a rotating magnetic field for driving said rotatable member and a nonrotating magnetic field for positioning said rotatable member relative to said stationary member, each of said coil means being supplied with a first current therethrough for producing the rotating magnetic field and a second current through at least a portion thereof supperimposed on the first current for producing the nonrotating magnetic field, sensing means for sensing the spacing between said stationary and rotatable members and providing an output indicative thereof, and control means for varying the second current and thereby the nonrotating field for maintaining a predetermined spacing between said stationary and rotatable members.
Claim 3
Dependent Claim
15 words
Electromagnetic drive assembly according to claim 1, further comprising pole pieces for said coil means.
Claim 4
Dependent Claim
22 words
Electromagnetic drive assembly according to claim 2, wherein each of said pole pieces has a main axis extending in a radial direction.
Claim 5
Dependent Claim
36 words
Electromagnetic drive assembly to claim 3, wherein said pole pieces are disposed in a stellar arrangement around said rotatable member, and a shroud interconnects the portions of the pole pieces facing away from said rotatable member.
Claim 6
Dependent Claim
24 words
Electromagnetic drive assembly according to claim 4, wherein said stationary member includes said pole pieces and said interconnecting shroud thereby defining a core member.
Claim 7
Dependent Claim
48 words
Electromagnetic drive assembly according to claim 4, wherein the end faces of the pole pieces facing said rotatable member are widened with respect to other portions of said pole pieces such that a small air gap is provided between two adjacent pole pieces at the end faces thereof.
Claim 8
Dependent Claim
30 words
Electromagnetic drive assembly according to claim 4, wherein said coil means are each arranged between two pole pieces and said coil means having the windings thereof wound around said shroud.
Claim 9
Dependent Claim
30 words
Electromagnetic drive assembly according to claim 6, wherein said coil means are each arranged between two pole pieces and said coil means have the windings thereof wound around said shroud.
Claim 10
Dependent Claim
23 words
Electromagnetic drive assembly according to claim 7, wherein said coil means are provided with individual windings extending over 180° of said stationary member.
Claim 11
Dependent Claim
18 words
Electromagnetic drive assembly according to claim 9, wherein said coil means comprise six individual windings spaced 60° apart.
Claim 12
Dependent Claim
23 words
Electromagnetic drive assembly according to claim 9, wherein each of said coil means is provided with separate connection means for individual energization thereof.
Claim 13
Dependent Claim
45 words
Electromagnetic drive assembly according to claim 11, wherein said control means is provided with at least one control mode for generating current for energizing said coil means to restore said rotatable member to a predetermined position in response to the output of said sensing means.
Claim 14
Dependent Claim
29 words
Electromagnetic drive assembly according to claim 12, wherein said control means is provided with another control mode for generating compensating signals for undesirable side effects of the actuating force.
Claim 15
Dependent Claim
35 words
Electromagnetic drive assembly to claim 12, wherein said sensing means includes inductive sensors formed at least in part by said coil means in addition to the driving and actuating functions provided by said coil means.
Claim 16
Dependent Claim
26 words
Electromagnetic drive assembly according to claim 14, wherein said inductive sensors are formed at least in part by portions of the winding of said coil means.
Claim 17
Dependent Claim
24 words
Electromagnetic drive assembly according to claim 15, wherein the current to energize the sensing means and that to provide the actuating force are identical.
Claim 18
Dependent Claim
18 words
Electromagnetic drive assembly according to claim 12, wherein said sensing means includes sensors arranged within said pole pieces.
Claim 19
Dependent Claim
49 words
Electromagnetic drive assembly according to claim 17, wherein said pole pieces are provided with a circumferentially extending recess in the end face thereof facing said rotatable member and said sensors include an inductive test loop disposed within the slot and terminating in connection means outwardly of said stationary member.
Claim 20
Dependent Claim
18 words
Electromagnetic drive assembly according to claim 14, wherein said rotatable member is formed of a magnetically hard material.
Claim 21
Dependent Claim
49 words
Electromagnetic drive assembly according to claim 19, wherein said coil means is responsive to continued rotation of said rotatable member without said coil means being energized for driving said rotatable member for operating in a generating mode to generate power in response to the rotation of said rotatable member.
Claim 22
Dependent Claim
76 words
Electromagnetic drive assembly according to claim 20, further comprising switching means for establishing a connection path from a power supply means to said coil means and to said control means, said switching means being responsive to failure of said power supply means for establishing a connection path between said coil means and said control means for supplying power generated in the generating mode of said coil means to said control means for purposes of positional control.
Claim 23
Dependent Claim
23 words
Electromagnetic drive assembly according to claim 1, wherein each of said coil means is provided with separate connection means for individual energization thereof.
Claim 24
Dependent Claim
45 words
Electromagnetic drive assembly according to claim 1, wherein said control means is provided with at least one control mode for generating current for energizing said soil means to restore said rotatable member to a predetermined position in response to the output of said sensing means.
Claim 25
Dependent Claim
29 words
Electromagnetic drive assembly according to claim 23, wherein said control means is provided with another control mode for generating compensating signals for undesirable side effects of the actuating force.
Claim 26
Dependent Claim
36 words
Electromagnetic drive assembly according to claim 23, wherein said sensing means includes inductive sensors formed at least in part by said coil means in addition to the driving and actuating functions provided by said coil means.
Claim 27
Dependent Claim
26 words
Electromagnetic drive assembly according to claim 25, wherein said inductive sensors are formed at least in part by portions of the windings of said coil means.
Claim 28
Dependent Claim
17 words
Electromagnetic drive assembly to claim 2, wherein said sensing means includes sensors arranged within said pole pieces.
Claim 29
Dependent Claim
49 words
Electromagnetic drive assembly according to claim 27, wherein said pole pieces are provided with a circumferentially extending recess in the end face thereof facing said rotatable member and said sensors include an inductive test loop disposed within the slot and terminating in connection means outwardly of said stationary member.
Claim 30
Dependent Claim
18 words
Electromagnetic drive assembly according to claim 1, wherein said rotatable member is formed of a magnetically hard material.
Claim 31
Dependent Claim
49 words
Electromagnetic drive assembly according to claim 29, wherein said coil means is responsive to continued rotation of said rotatable member without said coil means being energized for driving said rotatable member for operating in a generating mode to generate power in response to the rotation of said rotatable member.
Claim 32
Dependent Claim
77 words
Electromagnetic drive assembly control according to claim 30, further comprising switching means for establishing a connection path from a power supply means to said coil means and to said control means, said switching means being responsive to failure of said power supply means for establishing a connection path between said coil means and said control means for supplying power generated in the generating mode of said coil means to said control means for purposes of positional control.
Claim 33
Dependent Claim
15 words
Electromagnetic drive assembly according to claim 31, further comprising pole pieces for said coil means.
Claim 34
Dependent Claim
17 words
Electromagnetic drive assembly to claim 32, wherein said sensing means includes sensors arranged within said pole pieces.
Claim 35
Dependent Claim
49 words
Electromagnetic drive assembly according to claim 33, wherein said pole pieces are provided with a circumferentially extending recess in the end face thereof facing said rotatable member and said sensors include and inductive test loop disposed within the slot and terminating in connection means outwardly of said stationary member.
Claim 36
Dependent Claim
26 words
Electromagnetic drive assembly according to claim 26, wherein said stationary member is an annular member and said coil means are radially wound about said annular member.
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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) | 1979-10-26 | 1980-04-26 | 1980-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-26 | 1984-04-26 | 1984-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-26 | 1988-04-26 | 1988-10-26 | $7700.00 | Window Closed / Lapsed |