US5012673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for detecting a rotation angle
Assignee: Hitachi Ltd
•
Filing: 1988-04-01
•
Granted: 1991-05-07
•
Expires: 2008-04-01
Abstract
Abstract A measurement range is divided into a plurality of sections, a binary coded signal is generated at each division point, small section signals are generated at a predetermined interval between the binary coded signals, the binary coded signals are weighted by angles, and the small section signals are added or subtracted to or from the weighted signal to interpolate between two binary coded signals. Since the increment signals generated between the adjacent absolute signals is used as an interpolation signal between the absolute signals, the measurement accuracy is enhanced without increasing the number of elements for generating the absolute signals. The measured angle can be accurately read by adding or subtracting the increment signals to and from the weighted signal of the absolute signal.
Inventors
- 👤 Yoshiya Takano
- 👤 Yoshikazu Hoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:16
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/25; H; H03; H03M; H03M1/00; H03M1/12; H03M1/14; H03M1/143; G01D5/244; G01D5/245; G01D5/2454; G01D5/2455; H03M1/22; H03M1/24; H03M1/28; H03M1/285; H03M1/30
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
124 words
An angle detector for producing an absolute signal representing a rotation angle of a rotor, comprising: means for generating a plurality of absolute signals in a measurement range with at least one of said plurality of absolute signals representing at least one specific angle, wherein the interval of the absolute signals in a specific measurement range is smaller than in another measurement range; means for sequentially generating increment signals at a predetermined interval in accordance with the rotation of the rotor in measurement ranges above and below the specific angle; and means for adding or subtracting the increment signals to or from the at least one absolute signal representing said specific angle to produce the absolute signal representing the rotation angle of the rotor.
Claim 2
Dependent Claim
124 words
An angle detector for producing an absolute signal representing a rotation angle of a rotor, comprising: means for generating a plurality of absolute signals in a measurement range with at least one of said plurality of absolute signals representing at least one specific angle, wherein the interval of the absolute signals in a specific measurement range is smaller than in another measurement range; means for sequentially generating increment signals at a predetermined interval in accordance with the rotation of the rotor in measurement ranges above and below the specific angle; and means for adding or subtracting the increment signals to or from the at least one absolute signal representing said specific angle to produce the absolute signal representing the rotation angle of the rotor.
Claim 3
Dependent Claim
134 words
An angle detector for producing an absolute signal representing a rotation angle of a rotor, comprising: means for generating a plurality of absolute signals in a measurement range with at least one of said plurality of absolute signals representing at least one specific angle and being generated near an initial position of the rotor, wherein the interval of the absolute signals in a specific measurement range is smaller than in another measurement range; means for sequentially generating increment signals at a predetermined interval in accordance with the rotation of the rotor in measurement ranges above and below the specific angle; and means for adding or subtracting the increment signals to or from the at least one absolute signal representing said specific angle to produce the absolute signal representing the rotation angle of the rotor.
Claim 4
Dependent Claim
134 words
An angle detector for producing an absolute signal representing a rotation angle of a rotor, comprising: means for generating a plurality of absolute signals in a measurement range with at least one of said plurality of absolute signals representing at least one specific angle and being generated near an initial position of the rotor, wherein the interval of the absolute signals in a specific measurement range is smaller than in another measurement range; means for sequentially generating increment signals at a predetermined interval in accordance with the rotation of the rotor in measurement ranges above and below the specific angle; and means for adding or subtracting the increment signals to or from the at least one absolute signal representing said specific angle to produce the absolute signal representing the rotation angle of the rotor.
Claim 5
Dependent Claim
98 words
An angle detector for producing an absolute signal representing a rotation angle of a rotor, comprising: means for generating an absolute signal representing at least one specific angle in a measurement range; means for discriminating a direction of rotation of the rotor; means for generating increment signals at a predetermined interval in accordance with the rotation of the rotor over the measurement range; and means for adding or subtracting the increment signals to or from the absolute signal representing said specific angle depending on the direction of rotation discriminated by said discrimination means to correct the absolute signal.
Claim 6
Dependent Claim
98 words
An angle detector for producing an absolute signal representing a rotation angle of a rotor, comprising: means for generating an absolute signal representing at least one specific angle in a measurement range; means for discriminating a direction of rotation of the rotor; means for generating increment signals at a predetermined interval in accordance with the rotation of the rotor over the measurement range; and means for adding or subtracting the increment signals to or from the absolute signal representing said specific angle depending on the direction of rotation discriminated by said discrimination means to correct the absolute signal.
Claim 7
Dependent Claim
34 words
An angle detector according to claim 3, wherein said corrected absolute signal represents the rotation angle of the rotor and said corrected absolute signal is continuously produced regardless of the position of said rotor.
Claim 8
Dependent Claim
111 words
An angle detector for producing an absolute signal representing a rotation angle of a rotor, comprising: means for generating an absolute signal representing at least one specific angle in a measurement range; means for sequentially generating increment signals at a predetermined interval in accordance with the rotation of the rotor in measurement ranges above and below the specific angle; and means for adding or subtracting the increment signals to or from the absolute signal representing said specific angle to produce the absolute signal representing the rotation angle of the rotor, wherein said absolute signal representing the rotation angle of the rotor is continuosly produced regardless of the position of said rotor.
Claim 9
Dependent Claim
111 words
An angle detector for producing an absolute signal representing a rotation angle of a rotor, comprising: means for generating an absolute signal representing at least one specific angle in a measurement range; means for sequentially generating increment signals at a predetermined interval in accordance with the rotation of the rotor in measurement ranges above and below the specific angle; and means for adding or subtracting the increment signals to or from the absolute signal representing said specific angle to produce the absolute signal representing the rotation angle of the rotor, wherein said absolute signal representing the rotation angle of the rotor is continuosly produced regardless of the position of said rotor.
Claim 10
Dependent Claim
137 words
An angle detector for producing an absolute signal representing a rotation angle of a rotor, comprising: means for generating a binary coded signal representing at least one specific angle in a measurement range; means for sequentially generating increment signals at a predetermined interval in accordance with the rotation of the rotor in measurement ranges above and below the specific angle; means for counting the number of increment signals; means for adding or subtracting the count of the increment signals to or from the binary coded signal; and means for producing the sum or difference signal as a binary coded signal representing the absolute value of the rotation angle of the rotor, wherein said binary coded signal representing the absolute value of the rotation angle of the rotor is continuously reproduced regardless of the position of said rotor.
Claim 11
Dependent Claim
137 words
An angle detector for producing an absolute signal representing a rotation angle of a rotor, comprising: means for generating a binary coded signal representing at least one specific angle in a measurement range; means for sequentially generating increment signals at a predetermined interval in accordance with the rotation of the rotor in measurement ranges above and below the specific angle; means for counting the number of increment signals; means for adding or subtracting the count of the increment signals to or from the binary coded signal; and means for producing the sum or difference signal as a binary coded signal representing the absolute value of the rotation angle of the rotor, wherein said binary coded signal representing the absolute value of the rotation angle of the rotor is continuously reproduced regardless of the position of said rotor.
Claim 12
Dependent Claim
107 words
An angle detector for detecting a rotation angle of a rotor, comprising: means for generating a binary coded signal at each of division points in a measurement range; means for generating small section signals at a predetermined interval between specific binary coded signals; means for weighting the binary coded signal by angles; and means for adding or subtracting the small section signals to or from the weighted signal to produce an absolute signal which interpolates two binary coded signals, wherein said absolute signal which interpolates two binary coded signals represents the rotation angle of the rotor and is continuously produced regardless of the position of said rotor.
Claim 13
Dependent Claim
107 words
An angle detector for detecting a rotation angle of a rotor, comprising: means for generating a binary coded signal at each of division points in a measurement range; means for generating small section signals at a predetermined interval between specific binary coded signals; means for weighting the binary coded signal by angles; and means for adding or subtracting the small section signals to or from the weighted signal to produce an absolute signal which interpolates two binary coded signals, wherein said absolute signal which interpolates two binary coded signals represents the rotation angle of the rotor and is continuously produced regardless of the position of said rotor.
Claim 14
Dependent Claim
142 words
An angle detector for producing an absolute signal representing a rotation angle of a rotor, comprising: means for generating an absolute signal representing at least one specific angle in a measurement range; means for sequentially generating increment signals at a predetermined interval in accordance with the rotation of the rotor in measurement ranges above and below the specific angle; and means for adding or subtracting the increment signals to or from the absolute signal representing said specific angle to produce the absolute signal representing the rotation angle of the rotor, wherein a plurality of absolute signals are generated in the measurement range, each said absolute signal corresponding to a different section of the measurement range, whereby the interval of the absolute signal in a specific section of said measurement range is smaller than that in any other section of said measurement range.
Claim 15
Dependent Claim
142 words
An angle detector for producing an absolute signal representing a rotation angle of a rotor, comprising: means for generating an absolute signal representing at least one specific angle in a measurement range; means for sequentially generating increment signals at a predetermined interval in accordance with the rotation of the rotor in measurement ranges above and below the specific angle; and means for adding or subtracting the increment signals to or from the absolute signal representing said specific angle to produce the absolute signal representing the rotation angle of the rotor, wherein a plurality of absolute signals are generated in the measurement range, each said absolute signal corresponding to a different section of the measurement range, whereby the interval of the absolute signal in a specific section of said measurement range is smaller than that in any other section of said measurement range.
Claim 16
Dependent Claim
158 words
An angle detector for producing an absolute representing a rotation angle of a rotor, comprising: means for generating an absolute signal representing at least one specific angle in a measurement range, wherein the absolute signal representing said specific angle is generated near an initial position of the rotor; means for sequentially generating increment signals at a predetermined interval in accordance with the rotation of the rotor in measurement ranges above and below the specific angle; and means for adding or subtracting the increment signals to or from the absolute signal representing said specific angle to produce the absolute signal representing the rotation angle of the rotor, wherein a plurality of absolute signals are generated in the measurement range, each said absolute signal corresponding to a different section of the measurement range, whereby the interval of the absolute signal in a specific section of said measurement range is smaller than that in any other section of said measurement range.
Claim 17
Dependent Claim
158 words
An angle detector for producing an absolute representing a rotation angle of a rotor, comprising: means for generating an absolute signal representing at least one specific angle in a measurement range, wherein the absolute signal representing said specific angle is generated near an initial position of the rotor; means for sequentially generating increment signals at a predetermined interval in accordance with the rotation of the rotor in measurement ranges above and below the specific angle; and means for adding or subtracting the increment signals to or from the absolute signal representing said specific angle to produce the absolute signal representing the rotation angle of the rotor, wherein a plurality of absolute signals are generated in the measurement range, each said absolute signal corresponding to a different section of the measurement range, whereby the interval of the absolute signal in a specific section of said measurement range is smaller than that in any other section of said measurement range.
References Cited (Backward Citations)
US2926333A
Cited
US4016432A
Cited
US4267470A
Cited
US4201911A
Cited
GB2044463A
Cited
SU851780A1
Cited
US4421980A
Cited
US4733177A
Cited
US4698828A
Cited
US4633224A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-06 | 1994-11-05 | 1995-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-06 | 1998-11-05 | 1999-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-06 | 2002-11-05 | 2003-05-07 | $7700.00 | Window Closed / Lapsed |