US6239571B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resolver
Assignee: Individual
•
Filing: 1999-12-06
•
Granted: 2001-05-29
•
Expires: 2019-12-06
Abstract
Abstract A resolver comprises excitation windings for receiving excitation signals and a detection winding for outputting a detection signal. Displacement of a passive member provided with the excitation windings or the detection winding is detected on the basis of the detection signal which varies with the displacement of the passive member. A modulated signal obtained through modulation of a high-frequency signal by an excitation signal is input to each of the excitation windings, and a detection signal is obtained through demodulation of a modulated signal output from the detection winding. Since the modulated signal obtained through modulation (amplitude modulation) of the high-frequency signal by means of the excitation signal is applied to the excitation windings, the number of turns in the excitation and the detection windings can be reduced.
Inventors
- 👤 Shiro Shimahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:42
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/244; G01D5/24471; G01D5/24476; G01D5/14; G01D5/20; G01D5/204; G01D5/2086; G01D5/2448
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
99 words
A resolver comprising excitation windings for receiving excitation signals and a detection winding formed by use of a sheet coil for outputting a detection signal, in which displacement of a passive member provided with said excitation windings or said detection winding is detected on the basis of the detection signal which varies with the displacement of said passive member, wherein a modulated signal obtained through modulation of a high-frequency signal by an excitation signal is input to each of said excitation windings, and a detection signal is obtained through demodulation of a modulated signal output from said detection winding.
Claim 2
Dependent Claim
99 words
A resolver comprising excitation windings for receiving excitation signals and a detection winding formed by use of a sheet coil for outputting a detection signal, in which displacement of a passive member provided with said excitation windings or said detection winding is detected on the basis of the detection signal which varies with the displacement of said passive member, wherein a modulated signal obtained through modulation of a high-frequency signal by an excitation signal is input to each of said excitation windings, and a detection signal is obtained through demodulation of a modulated signal output from said detection winding.
Claim 3
Dependent Claim
20 words
The resolver according to claim 1 , wherein said excitation windings are each formed by use of a sheet coil.
Claim 4
Dependent Claim
25 words
The resolver according to claim 1 , wherein said passive member is a rotation shaft, and the rotational angle of said rotation shaft is detected.
Claim 5
Dependent Claim
48 words
The resolver according to claim 1 , wherein said excitation windings are fixedly provided; said detection winding is provided on a rotation shaft; and the rotational angle of said rotation shaft is detected on the basis of a phase difference between said excitation signals and said detection signal.
Claim 6
Dependent Claim
20 words
The resolver according to claim 4 , wherein said excitation windings are each formed by use of a sheet coil.
Claim 7
Dependent Claim
19 words
The resolver according to claim 4 , wherein said detection winding is formed by use of a sheet coil.
Claim 8
Dependent Claim
27 words
The resolver according to claim 1 , wherein said passive member is a linearly movable member, and an amount of movement of said movable member is detected.
Claim 9
Dependent Claim
26 words
The resolver according to claim 1 , wherein said modulated signal is obtained though amplitude modulation of said high-frequency signal in accordance with said excitation signal.
Claim 10
Dependent Claim
24 words
The resolver according to claim 8 , wherein the polarity of said high-frequency signal is reversed whenever the polarity of said excitation signal reverses.
Claim 11
Dependent Claim
27 words
The resolver according to claim 1 , further comprising a phase correction circuit for correcting a phase error produced between said excitation signals and said detection signal.
Claim 12
Dependent Claim
141 words
A resolver comprising excitation windings for receiving excitation signals and a detection winding formed by use of a sheet coil for outputting a detection signal, in which displacement of a passive member provided with said excitation windings or said detection winding is detected on the basis of the detection signal which varies with the displacement of said passive member, wherein a modulated signal obtained through modulation of a high-frequency signal by an excitation signal is input to each of said excitation windings, and a detection signal is obtained through demodulation of a modulated signal output from said detection winding; and wherein said excitation windings are fixedly provided; said detection winding is provided on a rotation shaft; and the rotational angle of said rotation shaft is detected on the basis of a phase difference between said excitation signals and said detection signal.
Claim 13
Dependent Claim
141 words
A resolver comprising excitation windings for receiving excitation signals and a detection winding formed by use of a sheet coil for outputting a detection signal, in which displacement of a passive member provided with said excitation windings or said detection winding is detected on the basis of the detection signal which varies with the displacement of said passive member, wherein a modulated signal obtained through modulation of a high-frequency signal by an excitation signal is input to each of said excitation windings, and a detection signal is obtained through demodulation of a modulated signal output from said detection winding; and wherein said excitation windings are fixedly provided; said detection winding is provided on a rotation shaft; and the rotational angle of said rotation shaft is detected on the basis of a phase difference between said excitation signals and said detection signal.
Claim 14
Dependent Claim
20 words
The resolver according to claim 11 , wherein said excitation windings are each formed by use of a sheet coil.
Claim 15
Dependent Claim
25 words
The resolver according to claim 11 , wherein said passive member is a rotation shaft, and the rotational angle of said rotation shaft is detected.
Claim 16
Dependent Claim
48 words
The resolver according to claim 11 , wherein said excitation windings are fixedly provided; said detection winding is provided on a rotation shaft; and the rotational angle of said rotation shaft is detected on the basis of a phase difference between said excitation signals and said detection signal.
Claim 17
Dependent Claim
27 words
The resolver according to claim 11 , wherein said passive member is a linearly movable member, and an amount of movement of said movable member is detected.
Claim 18
Dependent Claim
26 words
The resolver according to claim 11 , wherein said modulated signal is obtained through amplitude modulation of said high-frequency signal in accordance with said excitation signal.
Claim 19
Dependent Claim
24 words
The resolver according to claim 16 , wherein the polarity of said high-frequency signal is reversed whenever the polarity of said excitation signal reverses.
Claim 20
Dependent Claim
26 words
The resolver according to claim 11 , wherein a phase correction circuit for correcting a phase error produced between said excitation signals and said detection signal.
References Cited (Backward Citations)
US4144519A
Cited
JPS5917781B2
Cited
US4705971A
Cited
JPS62144021A
Cited
US5003260A
Cited
US4857926A
Cited
US4893071A
Cited
US5150115A
Cited
US5763976A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-05-28 | 2004-11-27 | 2005-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-05-28 | 2008-11-27 | 2009-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-05-28 | 2012-11-27 | 2013-05-29 | $7700.00 | Window Closed / Lapsed |