US5041769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
DC motor apparatus with an index signal output
Assignee: Samsung Electro Mechanics Japan Advanced Technology Co Ltd
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Filing: 1989-06-29
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Granted: 1991-08-20
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Expires: 2009-06-29
Abstract
Abstract A dc motor apparatus with an index signal output comprises: a dc motor including: a stator having driving coils; a rotor having plural pairs of magnetic poles; plural magnetic sensors provided to the stator for sensing magnetic flux from the plural magnetic poles, one of the sensors producing a first signal; and a driving circuit responsive to output signals of the plural magnetic sensors for producing drive signals to energize the driving coils; and one of the magnetic poles magnetized to exhibit a different intensity of magnetic flux density from that of remaining poles; a peak level detecting circuit responsive to the first signal for detecting a peak level thereof and holding it for a predetermined interval to produce a reference signal; and comparing circuit for producing a second signal when the first signal has a predetermined relationship with the reference signal n. A level of the reference signal is changed in accordance with a detected peak level of the signal of the magnetic sensors to generate an index signal stably.
Inventors
- 👤 Hiroshi Iwai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:45
CPC Classifications
H; H02; H02P; H02P6/00; H02P6/14
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
217 words
A dc motor apparatus with an index signal output comprising: (a) a dc motor including: a stator having driving coils; a rotor having plural pairs of magnetic poles; plural magnetic sensors provided on said stator for producing output signals by sensing magnetic flux from said plural magnetic poles; and driving means responsive to said output signals of said plural magnetic sensors for producing drive signals to energize said driving coils; and means for causing one of said magnetic poles to exhibit a different intensity of magnetic flux density from that of remaining poles, one of said sensors producing a first signal in response to said difference intensity; (b) peak level detecting means responsive to said first signal for detecting a peak level thereof and holding it for a predetermined interval to produce a reference signal; (c) comparing means for producing a second signal when said first signal has a predetermined relationship with said reference signal by comparing said first signal with said reference signal; zero-cross detecting means producing a third signal when detecting that said first signal substantially crosses zero level; and logic circuit means responsive to said second and third signals for producing said index signal at a predetermined point when said second signal assumes a given level within a period defined by said third signal.
Claim 2
Dependent Claim
217 words
A dc motor apparatus with an index signal output comprising: (a) a dc motor including: a stator having driving coils; a rotor having plural pairs of magnetic poles; plural magnetic sensors provided on said stator for producing output signals by sensing magnetic flux from said plural magnetic poles; and driving means responsive to said output signals of said plural magnetic sensors for producing drive signals to energize said driving coils; and means for causing one of said magnetic poles to exhibit a different intensity of magnetic flux density from that of remaining poles, one of said sensors producing a first signal in response to said difference intensity; (b) peak level detecting means responsive to said first signal for detecting a peak level thereof and holding it for a predetermined interval to produce a reference signal; (c) comparing means for producing a second signal when said first signal has a predetermined relationship with said reference signal by comparing said first signal with said reference signal; zero-cross detecting means producing a third signal when detecting that said first signal substantially crosses zero level; and logic circuit means responsive to said second and third signals for producing said index signal at a predetermined point when said second signal assumes a given level within a period defined by said third signal.
Claim 3
Dependent Claim
229 words
A dc motor apparatus with an index signal output comprising: (a) a dc motor including: a stator having driving coils; a rotor having plural pairs of magnetic poles; plural magnetic sensors provided on said stator for producing output signals by sensing magnetic flux from said plural magnetic poles; and driving means responsive to said output signals of said plural magnetic sensors for producing drive signals to energize said driving coils; and means for causing one of said magnetic poles to exhibit a different intensity of magnetic flux density from that of remaining poles, one of said sensors producing a first signal in response to said difference intensity; (b) peak level detecting means responsive to said first signal for detecting a peak level thereof and holding it for a predetermined interval to produce a reference signal; (c) comparing means for producing a second signal when said first signal has a predetermined relationship with said reference signal by comparing said first signal with said reference signal; zero-cross detecting means producing a third signal when detecting that said first signal substantially crosses zero level; an R-S flip-flop set by said second signal, reset by said third signal; and a D flip-flop for holding level of its D input responsive to an output from said R-S flip-flop and for outputting held level in response to said third signal to produce said index signal.
Claim 4
Dependent Claim
229 words
A dc motor apparatus with an index signal output comprising: (a) a dc motor including: a stator having driving coils; a rotor having plural pairs of magnetic poles; plural magnetic sensors provided on said stator for producing output signals by sensing magnetic flux from said plural magnetic poles; and driving means responsive to said output signals of said plural magnetic sensors for producing drive signals to energize said driving coils; and means for causing one of said magnetic poles to exhibit a different intensity of magnetic flux density from that of remaining poles, one of said sensors producing a first signal in response to said difference intensity; (b) peak level detecting means responsive to said first signal for detecting a peak level thereof and holding it for a predetermined interval to produce a reference signal; (c) comparing means for producing a second signal when said first signal has a predetermined relationship with said reference signal by comparing said first signal with said reference signal; zero-cross detecting means producing a third signal when detecting that said first signal substantially crosses zero level; an R-S flip-flop set by said second signal, reset by said third signal; and a D flip-flop for holding level of its D input responsive to an output from said R-S flip-flop and for outputting held level in response to said third signal to produce said index signal.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-19 | 1995-02-18 | 1995-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-19 | 1999-02-18 | 1999-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-19 | 2003-02-18 | 2003-08-20 | $7700.00 | Window Closed / Lapsed |