US5625239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for sensing relative position between two relatively rotatable members using concentric rings
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1994-10-26
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Granted: 1997-04-29
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Expires: 2014-10-26
Abstract
Abstract An apparatus for sensing the relative rotational position between a stator (28) and a rotor (32) in a variable reluctance motor (26) includes a transmitting ring (40) mounted to the rotor (32) and having a transmitting coil (46) mounted thereon. A receiving ring (42) is mounted to stator (46) and has a receiving coil (56) mounted thereon. The receiving coil includes three conductor patterns (56a, 56b, 56c) having the same shape, each of said conductor patterns being electrically insulated from each other, and each conductor pattern being offset from adjacent conductor patterns by 120 electrical degrees. A drive signal is coupled to the transmitting coil. The apparatus further includes a controller (76) for monitoring the outputs from the receiving coil patterns and for determining the relative rotation between the rotor and the stator from the monitored outputs. The receiving coil patterns are each arranged in a circumferentially varying square wave pattern.
Inventors
- 👤 Erland K. Persson
- 👤 Don Blandino
- 👤 Michael J. Boyer
- 👤 Michael J. Medora
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:48
CPC Classifications
H; H02; H02K; H02K19/00; H02K19/02; H02K19/10; H02K19/103; G; G01; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/20; G01D5/204; G01D5/2073; G01D5/2086; H02K11/00; H02K11/20; H02K11/24; H02K11/25; H02K11/30; H02K11/33; H02K29/00; H02K29/06; H02K29/12
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
103 words
An apparatus for sensing the relative rotational position between first and second relatively rotatable members, comprising: a transmitting ring being mountable to said first member, said transmitting ring having a transmitting coil mounted thereon and arranged in a circumferentially varying sinusoidal pattern; and a receiving ring being mountable to said second member so that said transmitting ring and said receiving ring are concentric, said receiving ring having a receiving coil mounted thereon and arranged in a pattern so as to receive a signal from said transmitting ring and output a signal indicative of the relative rotational position between said first and second members.
Claim 2
Independent Claim
103 words
An apparatus for sensing the relative rotational position between first and second relatively rotatable members, comprising: a transmitting ring being mountable to said first member, said transmitting ring having a transmitting coil mounted thereon and arranged in a circumferentially varying sinusoidal pattern; and a receiving ring being mountable to said second member so that said transmitting ring and said receiving ring are concentric, said receiving ring having a receiving coil mounted thereon and arranged in a pattern so as to receive a signal from said transmitting ring and output a signal indicative of the relative rotational position between said first and second members.
Claim 3
Dependent Claim
18 words
The apparatus of claim 1 wherein said receiving coil is arranged in a circumferentially varying square wave pattern.
Claim 4
Dependent Claim
24 words
The apparatus of claim 1 wherein said receiving coil includes three conductor patterns, each of the patterns being electrically insulated from each other pattern.
Claim 5
Dependent Claim
19 words
The apparatus of claim 3 wherein each conductor pattern is offset from an adjacent pattern by 120 electrical degrees.
Claim 6
Dependent Claim
70 words
The apparatus of claim 1 further including a rotary coupling transformer operatively mounted between a stationary member and said first member, said first member rotating relative to said stationary member, a primary coil of said rotary coupling transformer being electrically connectable to a sinusoidal drive signal, a secondary coil of said rotary coupling transformer being electrically connected to said transmitting coil for providing a drive signal to said transmitting coil.
Claim 7
Dependent Claim
18 words
The apparatus of claim 1 wherein said transmitting coil extends around the entire circumference of said transmitting ring.
Claim 8
Dependent Claim
46 words
The apparatus of claim 1 wherein said transmitting ring includes two separate layers of conductor patterns, each pattern being arranged in the form of a circumferentially varying sinusoid, with the two patterns electrically insulated from each other and offset from each other by 180 electrical degrees.
Claim 9
Dependent Claim
25 words
The apparatus of claim 1 wherein said transmitting ring and said receiving ring are made from a material having a magnetic permeability greater than one.
Claim 10
Dependent Claim
31 words
The apparatus of claim 1 wherein said transmitting ring has a machined groove in the form of said circumferentially varying sinusoidal pattern with said transmitting coil mounted in said machined groove.
Claim 11
Dependent Claim
35 words
The apparatus of claim 1 wherein said transmitting ring has a plurality of radially extending poles in the form of said circumferentially varying sinusoidal pattern with said transmitting coil wound around said radially extending poles.
Claim 12
Dependent Claim
33 words
The apparatus of claim 1 wherein said transmitting coil arranged in a circumferentially varying sinusoidal pattern is formed on a flexible linear circuit, said flexible linear circuit being mounted to said transmitting ring.
Claim 13
Independent Claim
123 words
An apparatus for sensing the relative rotational position between a stator and a rotor in a variable reluctance motor, comprising: a transmitting ring mounted so as to be stationary relative to one of said stator and rotor, said transmitting ring having a transmitting coil mounted thereon and arranged in a circumferentially varying sinusoidal pattern; and a receiving ring mounted so as to be stationary relative to the other of said stator and rotor so that said transmitting ring and said receiving ring are concentric, said receiving ring having a receiving coil mounted thereon and arranged in a pattern so as to receive a signal from said transmitting ring and output a signal indicative of the relative rotational position of said stator and rotor.
Claim 14
Independent Claim
123 words
An apparatus for sensing the relative rotational position between a stator and a rotor in a variable reluctance motor, comprising: a transmitting ring mounted so as to be stationary relative to one of said stator and rotor, said transmitting ring having a transmitting coil mounted thereon and arranged in a circumferentially varying sinusoidal pattern; and a receiving ring mounted so as to be stationary relative to the other of said stator and rotor so that said transmitting ring and said receiving ring are concentric, said receiving ring having a receiving coil mounted thereon and arranged in a pattern so as to receive a signal from said transmitting ring and output a signal indicative of the relative rotational position of said stator and rotor.
Claim 15
Dependent Claim
18 words
The apparatus of claim 12 wherein said receiving coil is arranged in a circumferentially varying square wave pattern.
Claim 16
Dependent Claim
24 words
The apparatus of claim 12 wherein said receiving coil includes three conductor patterns, each of the patterns being electrically insulated from each other pattern.
Claim 17
Dependent Claim
19 words
The apparatus of claim 14 wherein each conductor pattern is offset from an adjacent pattern by 120 electrical degrees.
Claim 18
Dependent Claim
72 words
The apparatus of claim 12 wherein said transmitting ring is secured to said rotor and wherein said apparatus further includes a rotary coupling transformer operatively mounted between said stator and said rotor, a primary coil of said rotary coupling transformer being electrically connectable to a sinusoidal drive signal, a secondary coil of said rotary coupling transformer being electrically connected to said transmitting coil for providing a drive signal to said transmitting coil.
Claim 19
Dependent Claim
18 words
The apparatus of claim 12 wherein said transmitting coil extends around the entire circumference of said transmitting ring.
Claim 20
Dependent Claim
46 words
The apparatus of claim 12 wherein said transmitting ring includes two separate layers of conductor patterns, each pattern being arranged in the form of a circumferentially varying sinusoid, with the two patterns electrically insulated from each other and offset from each other by 180 electrical degrees.
Claim 21
Independent Claim
110 words
A method for sensing the relative rotational position between first and second relatively rotatable members, comprising the steps of: (a) providing a transmitting ring; (b) securing a transmitting coil to said transmitting ring in a circumferentially varying sinusoidal pattern; (c) mounting said transmitting ring to one of said first and second members; (d) providing a receiving ring; (e) securing a receiving coil to said receiving ring in a pattern so as to receive a signal from said transmitting ring and output a signal indicative of the relative rotational position of said first and second members; and (f) mounting said receiving ring to the other of said first and second members.
Claim 22
Independent Claim
110 words
A method for sensing the relative rotational position between first and second relatively rotatable members, comprising the steps of: (a) providing a transmitting ring; (b) securing a transmitting coil to said transmitting ring in a circumferentially varying sinusoidal pattern; (c) mounting said transmitting ring to one of said first and second members; (d) providing a receiving ring; (e) securing a receiving coil to said receiving ring in a pattern so as to receive a signal from said transmitting ring and output a signal indicative of the relative rotational position of said first and second members; and (f) mounting said receiving ring to the other of said first and second members.
Claim 23
Dependent Claim
53 words
The method of claim 19 wherein said step of securing said receiving coil to said receiving ring includes securing three conductor patterns and electrically insulating each conductor pattern from adjacent conductor patterns, and securing said conductor patterns to said receiving ring so that the patterns are electrically offset from each other by 120°.
Claim 24
Independent Claim
111 words
A method for sensing the relative rotational position between a stator and a rotor in a variable reluctance motor, comprising the steps of: (a) providing a transmitting ring; (b) securing a transmitting coil to said transmitting ring in a circumferentially varying sinusoidal pattern; (c) mounting said transmitting ring to one of said stator and rotor; (d) providing a receiving ring; (e) securing a receiving coil to said receiving ring in a pattern so as to receive a signal from said transmitting ring and output a signal indicative of the relative rotational position of said stator and rotor; and (f) mounting said receiving ring to the other of said stator and rotor.
Claim 25
Independent Claim
111 words
A method for sensing the relative rotational position between a stator and a rotor in a variable reluctance motor, comprising the steps of: (a) providing a transmitting ring; (b) securing a transmitting coil to said transmitting ring in a circumferentially varying sinusoidal pattern; (c) mounting said transmitting ring to one of said stator and rotor; (d) providing a receiving ring; (e) securing a receiving coil to said receiving ring in a pattern so as to receive a signal from said transmitting ring and output a signal indicative of the relative rotational position of said stator and rotor; and (f) mounting said receiving ring to the other of said stator and rotor.
References Cited (Backward Citations)
US2650352A
Cited
US3099830A
Cited
US4223300A
Cited
US4645961A
Cited
US4697144A
Cited
US4743786A
Cited
US4829247A
Cited
US4851771A
Cited
US5406155A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-04-28 | 2000-10-28 | 2001-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-04-28 | 2004-10-28 | 2005-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-04-28 | 2008-10-28 | 2009-04-29 | $7700.00 | Window Closed / Lapsed |