US5446966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Angular position transducer
Assignee: Individual
•
Filing: 1994-01-18
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Granted: 1995-09-05
•
Expires: 2014-01-18
Abstract
Abstract Disclosed is a high accuracy angular position transducer of simple constuction. The angular position transducer consists of a stator core in slots of which both exciting windings with p 1 pole pairs and output windings with p 2 pole pairs are wound, and a rotor core which carries no windings and has salient poles whose number is an integer N satisfying one of the following relations, p 1 +p 2 =N, or p 1 -p 2 =±N. In this construction the angular position is detected by using the following voltages induced in output windings: two or three phase voltages having a sinusoidal waveform of one cycle per rotation of 1/N of the circumference, in the combination of single phase exciting windings and two or three phase output windings; single phase voltage having a sinusoidal waveform whose phase shifts by 2.sub.π per rotation of 1/N of the circumference, in the combination of two phase exciting windings and single phase output windings.
Inventors
- 👤 Akira Ishizaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:51
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/20; G01D5/204; G01D5/2046; H; H02; H02K; H02K24/00
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
112 words
An angular position transducer comprising: a stator having exciting windings and output windings enclosed in slots formed in an iron core, said exciting windings having a first number of pole pairs, and said output windings having a second number of pole pairs different than said first number of pole pairs; and a rotor with no windings and which is constructed by only an iron core having a number of salient poles equal to a sum of the first number of pole pairs and the second number of pole pairs; wherein said angular position transducer has a combination of the exciting winding of a single phase and the output windings of two phases.
Claim 2
Dependent Claim
112 words
An angular position transducer comprising: a stator having exciting windings and output windings enclosed in slots formed in an iron core, said exciting windings having a first number of pole pairs, and said output windings having a second number of pole pairs different than said first number of pole pairs; and a rotor with no windings and which is constructed by only an iron core having a number of salient poles equal to a sum of the first number of pole pairs and the second number of pole pairs; wherein said angular position transducer has a combination of the exciting winding of a single phase and the output windings of two phases.
Claim 3
Dependent Claim
63 words
A transducer according to claim 1, wherein in the case where the center of one of said salient poles is set as an origin, and a space angle indicative of the position on the outer periphery of the rotor is set to θ 2 , said rotor has a shape such that a gap permeance fluctuation is in proportion to cos(Nθ 2 ).
Claim 4
Dependent Claim
71 words
A transducer according to claim 1, wherein a first air gap length at one point on the outer periphery of said rotor constitutes a minimum air gap length, and a second air gap length at a point on the side opposite of a diameter which passes through said one point constitutes a maximum air gap length, thereby enabling the absolute position to be detected as a rotor shape corresponding to N=1.
Claim 5
Dependent Claim
71 words
A transducer according to claim 2, wherein a first air gap length at one point on the outer periphery of said rotor constitutes a minimum air gap length and a second air gap length at a point on the side opposite of a diameter which passes through said one point constitutes a maximum air gap length, thereby enabling the absolute position to be detected as a rotor shape corresponding to N=1.
Claim 6
Dependent Claim
112 words
An angular position transducer comprising: a stator having exciting windings and output windings enclosed in slots formed in an iron core, said exciting windings having a first number of pole pairs, and said output windings having a second number of pole pairs different than said first number of pole pairs; and a rotor with no windings and which is constructed by only an iron core having a number of salient poles equal to a sum of the first number of pole pairs and the second number of pole pairs; wherein said angular position transducer has a combination of the exciting winding of a single phase and the output windings of three phases.
Claim 7
Dependent Claim
112 words
An angular position transducer comprising: a stator having exciting windings and output windings enclosed in slots formed in an iron core, said exciting windings having a first number of pole pairs, and said output windings having a second number of pole pairs different than said first number of pole pairs; and a rotor with no windings and which is constructed by only an iron core having a number of salient poles equal to a sum of the first number of pole pairs and the second number of pole pairs; wherein said angular position transducer has a combination of the exciting winding of a single phase and the output windings of three phases.
Claim 8
Dependent Claim
63 words
A transducer according to claim 5, wherein in the case where the center of one of said salient poles is set as an origin, and a space angle indicative of the position on the outer periphery of the rotor is set to θ 2 , said rotor has a shape such that a gap permeance fluctuation is in proportion to cos(Nθ 2 ).
Claim 9
Dependent Claim
71 words
A transducer according to claim 5, wherein a first air gap length at one point on the outer periphery of said rotor constitutes a minimum air gap length, and a second air gap length at a point on the side opposite of a diameter which passes through said one point constitutes a maximum air gap length, thereby enabling the absolute position to be detected as a rotor shape corresponding to N=1.
Claim 10
Dependent Claim
71 words
A transducer according to claim 6, wherein a first air gap length at one point on the outer periphery of said rotor constitutes a minimum air gap length and a second air gap length at a point on the side opposite of a diameter which passes through said one point constitutes a maximum air gap length, thereby enabling the absolute position to be detected as a rotor shape corresponding to N=1.
Claim 11
Dependent Claim
112 words
An angular position transducer comprising: a stator having exciting windings and output windings enclosed in slots formed in an iron core, said exciting windings having a first number of pole pairs, and said output windings having a second number of pole pairs different than said first number of pole pairs; and a rotor with no windings and which is constructed by only an iron core having a number of salient poles equal to a sum of the first number of pole pairs and the second number of pole pairs; wherein said angular position transducer has a combination of the exciting windings of two phases and the output winding of a single phase.
Claim 12
Dependent Claim
112 words
An angular position transducer comprising: a stator having exciting windings and output windings enclosed in slots formed in an iron core, said exciting windings having a first number of pole pairs, and said output windings having a second number of pole pairs different than said first number of pole pairs; and a rotor with no windings and which is constructed by only an iron core having a number of salient poles equal to a sum of the first number of pole pairs and the second number of pole pairs; wherein said angular position transducer has a combination of the exciting windings of two phases and the output winding of a single phase.
Claim 13
Dependent Claim
63 words
A transducer according to claim 9, wherein in the case where the center of one of said salient poles is set as an origin, and a space angle indicative of the position on the outer periphery of the rotor is set to θ 2 , said rotor has a shape such that a gap permeance fluctuation is in proportion to cos(Nθ 2 ).
Claim 14
Dependent Claim
71 words
A transducer according to claim 9, wherein a first air gap length at one point on the outer periphery of said rotor constitutes a minimum air gap length, and a second air gap length at a point on the side opposite of a diameter which passes through said one point constitutes a maximum air gap length, thereby enabling the absolute position to be detected as a rotor shape corresponding to N=1.
Claim 15
Dependent Claim
71 words
A transducer according to claim 10, wherein a first air gap length at one point on the outer periphery of said rotor constitutes a minimum air gap length and a second air gap length at a point on the side opposite of a diameter which passes through said one point constitutes a maximum air gap length, thereby enabling the absolute position to be detected as a rotor shape corresponding to N=1.
Claim 16
Dependent Claim
112 words
An angular position transducer comprising: a stator having exciting windings and output windings enclosed in slots formed in an iron core, said exciting windings having a first number of pole pairs, and said output windings having a second number of pole pairs different than said first number of pole pairs; and a rotor with no windings and which is constructed by only an iron core having a number of salient poles equal to a difference between the first number of pole pairs and the second number of pole pairs; wherein said angular position transducer has a combination of the exciting winding of a single phase and the output windings of two phases.
Claim 17
Dependent Claim
112 words
An angular position transducer comprising: a stator having exciting windings and output windings enclosed in slots formed in an iron core, said exciting windings having a first number of pole pairs, and said output windings having a second number of pole pairs different than said first number of pole pairs; and a rotor with no windings and which is constructed by only an iron core having a number of salient poles equal to a difference between the first number of pole pairs and the second number of pole pairs; wherein said angular position transducer has a combination of the exciting winding of a single phase and the output windings of two phases.
Claim 18
Dependent Claim
63 words
A transducer according to claim 13, wherein in the case where the center of one of said salient poles is set as an origin, and a space angle indicative of the position on the outer periphery of the rotor is set to θ 2 , said rotor has a shape such that a gap permeance fluctuation is in proportion to cos(Nθ 2 ).
Claim 19
Dependent Claim
71 words
A transducer according to claim 13, wherein a first air gap length at one point on the outer periphery of said rotor constitutes a minimum air gap length, and a second air gap length at a point on the side opposite of a diameter which passes through said one point constitutes a maximum air gap length, thereby enabling the absolute position to be detected as a rotor shape corresponding to N=1.
Claim 20
Dependent Claim
71 words
A transducer according to claim 14, wherein a first air gap length at one point on the outer periphery of said rotor constitutes a minimum air gap length and a second air gap length at a point on the side opposite of a diameter which passes through said one point constitutes a maximum air gap length, thereby enabling the absolute position to be detected as a rotor shape corresponding to N=1.
Claim 21
Dependent Claim
112 words
An angular position transducer comprising: a stator having exciting windings and output windings enclosed in slots formed in an iron core, said exciting windings having a first number of pole pairs, and said output windings having a second number of pole pairs different than said first number of pole pairs; and a rotor with no windings and which is constructed by only an iron core having a number of salient poles equal to a difference between the first number of pole pairs and the second number of pole pairs; wherein said angular position transducer has a combination of the exciting winding of a single phase and the output windings of three phases.
Claim 22
Dependent Claim
112 words
An angular position transducer comprising: a stator having exciting windings and output windings enclosed in slots formed in an iron core, said exciting windings having a first number of pole pairs, and said output windings having a second number of pole pairs different than said first number of pole pairs; and a rotor with no windings and which is constructed by only an iron core having a number of salient poles equal to a difference between the first number of pole pairs and the second number of pole pairs; wherein said angular position transducer has a combination of the exciting winding of a single phase and the output windings of three phases.
Claim 23
Dependent Claim
63 words
A transducer according to claim 17, wherein in the case where the center of one of said salient poles is set as an origin, and a space angle indicative of the position on the outer periphery of the rotor is set to θ 2 , said rotor has a shape such that a gap permeance fluctuation is in proportion to cos(Nθ 2 ).
Claim 24
Dependent Claim
71 words
A transducer according to claim 17, wherein a first air gap length at one point on the outer periphery of said rotor constitutes a minimum air gap length, and a second air gap length at a point on the side opposite of a diameter which passes through said one point constitutes a maximum air gap length, thereby enabling the absolute position to be detected as a rotor shape corresponding to N=1.
Claim 25
Dependent Claim
71 words
A transducer according to claim 18, wherein a first air gap length at one point on the outer periphery of said rotor constitutes a minimum air gap length and a second air gap length at a point on the side opposite of a diameter which passes through said one point constitutes a maximum air gap length, thereby enabling the absolute position to be detected as a rotor shape corresponding to N=1.
Claim 26
Dependent Claim
112 words
An angular position transducer comprising: a stator having exciting windings and output windings enclosed in slots formed in an iron core, said exciting windings having a first number of pole pairs, and said output windings having a second number of pole pairs different than said first number of pole pairs; and a rotor with no windings and which is constructed by only an iron core having a number of salient poles equal to a difference between the first number of pole pairs and the second number of pole pairs; wherein said angular position transducer has a combination of the exciting windings of two phases and the output winding of a single phase.
Claim 27
Dependent Claim
112 words
An angular position transducer comprising: a stator having exciting windings and output windings enclosed in slots formed in an iron core, said exciting windings having a first number of pole pairs, and said output windings having a second number of pole pairs different than said first number of pole pairs; and a rotor with no windings and which is constructed by only an iron core having a number of salient poles equal to a difference between the first number of pole pairs and the second number of pole pairs; wherein said angular position transducer has a combination of the exciting windings of two phases and the output winding of a single phase.
Claim 28
Dependent Claim
63 words
A transducer according to claim 21, wherein in the case where the center of one of said salient poles is set as an origin, and a space angle indicative of the position on the outer periphery of the rotor is set to θ 2 , said rotor has a shape such that a gap permeance fluctuation is in proportion to cos(Nθ 2 ).
Claim 29
Dependent Claim
71 words
A transducer according to claim 21, wherein a first air gap length at one point on the outer periphery of said rotor constitutes a minimum air gap length, and a second air gap length at a point on the side opposite of a diameter which passes through said one point constitutes a maximum air gap length, thereby enabling the absolute position to be detected as a rotor shape corresponding to N=1.
Claim 30
Dependent Claim
71 words
A transducer according to claim 22, wherein a first air gap length at one point on the outer periphery of said rotor constitutes a minimum air gap length and a second air gap length at a point on the side opposite of a diameter which passes through said one point constitutes a maximum air gap length, thereby enabling the absolute position to be detected as a rotor shape corresponding to N=1.
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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) | 1998-09-04 | 1999-03-06 | 1999-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-09-04 | 2003-03-06 | 2003-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-09-04 | 2007-03-06 | 2007-09-05 | $7700.00 | Window Closed / Lapsed |