US6031350A
Expired / Lapsed
US
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Position control and monitoring circuit and method for an electric motor
Assignee: Individual
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Filing: 1996-09-23
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Granted: 2000-02-29
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Expires: 2016-09-23
Abstract
Abstract A position control and monitoring circuitry is provided for an electric motor having a plurality of coils and a movable element. A drive circuit generates a square wave drive signal of variable mark/space ratio to drive the coils to position the movable element. A monitoring circuit modulates square wave transitions at a sub-harmnonic of the drive signal frequency and generates a monitoring signal for injection into the coils. A sensor senses the monitoring signal from the coils to determine the position of the movable element. A difference circuit drives the drive circuit with a difference between an input signal and an output signal of the sensor.
Inventors
- 👤 Roger Charles Hey Sidey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:31
CPC Classifications
G; G05; G05B; G05B19/00; G05B19/02; G05B19/18; G05B19/19; G05B19/27; G05B19/31; G05B19/311; G05B2219/00; G05B2219/30; G05B2219/37; G05B2219/37019; G05B2219/37133; G05B2219/37529; G05B2219/41; G05B2219/41337; G05B2219/42; G05B2219/42237
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
118 words
A position control and monitoring circuitry for an electric motor having a plurality of coils and a movable element, comprising: drive means generating a square wave drive signal of variable mark/space ratio to drive the coils to position the movable element, the square wave drive signal having a drive signal frequency; monitoring means for modulating square wave transitions at a sub-harmonic of the drive signal frequency to generate a monitoring signal for supply to the coils; sensing means for sensing the monitoring signal from the coils to thereby determine the position of the movable element; and difference means for driving the drive means with a difference between an input signal and an output signal of the sensing means.
Claim 2
Dependent Claim
118 words
A position control and monitoring circuitry for an electric motor having a plurality of coils and a movable element, comprising: drive means generating a square wave drive signal of variable mark/space ratio to drive the coils to position the movable element, the square wave drive signal having a drive signal frequency; monitoring means for modulating square wave transitions at a sub-harmonic of the drive signal frequency to generate a monitoring signal for supply to the coils; sensing means for sensing the monitoring signal from the coils to thereby determine the position of the movable element; and difference means for driving the drive means with a difference between an input signal and an output signal of the sensing means.
Claim 3
Dependent Claim
22 words
A circuitry according to claim 1, wherein the monitoring means modulates the square wave transitions at half of the drive signal frequency.
Claim 4
Dependent Claim
41 words
A circuitry according to claim 1, wherein the square wave transitions are, in a first sense, modulated by the drive means, and the square wave transitions are, in a second sense opposite to the first sense, modulated by the monitoring means.
Claim 5
Dependent Claim
41 words
A circuitry according to claim 2, wherein the square wave transitions are, in a first sense, modulated by the drive means, and the square wave transitions are, in a second sense opposite to the first sense, modulated by the monitoring means.
Claim 6
Dependent Claim
117 words
A position control and monitoring method for control and monitoring an electric motor having a plurality of coils and a movable element, comprising the steps of: with a drive circuit, generating a square wave drive signal of variable mark/space ratio to drive the coils to position the movable element, the square wave drive signal having a drive signal frequency; modulating square wave transitions at a sub-harmonic of the drive signal frequency to generate a monitoring signal for supply to the coils; sensing the monitoring signal from the coils to thereby determine the position of the movable element; and driving the drive circuit with a difference between an input signal and an output signal of the sensing step.
Claim 7
Dependent Claim
117 words
A position control and monitoring method for control and monitoring an electric motor having a plurality of coils and a movable element, comprising the steps of: with a drive circuit, generating a square wave drive signal of variable mark/space ratio to drive the coils to position the movable element, the square wave drive signal having a drive signal frequency; modulating square wave transitions at a sub-harmonic of the drive signal frequency to generate a monitoring signal for supply to the coils; sensing the monitoring signal from the coils to thereby determine the position of the movable element; and driving the drive circuit with a difference between an input signal and an output signal of the sensing step.
Claim 8
Dependent Claim
27 words
A method according to claim 5, wherein the step of modulating the square wave transitions is performed with a sub-harmonic having half of the drive signal frequency.
Claim 9
Dependent Claim
47 words
A method according to claim 5, wherein the step of modulating is performed by modulating the square wave transitions in a first sense by the drive circuit, and by modulating the square wave transitions in a second sense opposite to the first sense by the monitoring signal.
Claim 10
Dependent Claim
47 words
A method according to claim 6, wherein the step of modulating is performed by modulating the square wave transitions in a first sense by the drive circuit and by modulating the square wave transitions in a second sense opposite to the first sense by the monitoring signal.
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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) | 2003-02-28 | 2003-08-30 | 2004-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-02-28 | 2007-08-30 | 2008-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-02-28 | 2011-08-30 | 2012-02-29 | $7700.00 | Window Closed / Lapsed |