US4490665A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for driving a stepper motor
Assignee: Beckman Coulter Inc
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Filing: 1983-07-26
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Granted: 1984-12-25
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Expires: 2003-07-26
Abstract
Abstract A method for driving a stepper motor. The method includes varying the width of the high level drive impulses of a bi-level drive system based on the desired speed to be achieved by the stepper motor. A microprocessor is used to vary the pulse width.
Inventors
- 👤 Richard C. Meyer
- 👤 Peter Kan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:17
CPC Classifications
H; H02; H02P; H02P8/00; H02P8/14; H02P8/16; H02P8/165; H02P8/32
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
65 words
A method for driving a stepper motor wherein at least some steps of the motor rotation each comprise: supplying a first voltage to the motor for a time period, such time period being selected as a function of the required speed of the motor; and supplying a second lower voltage to the motor for the remainder of the motor step after the time period ends.
Claim 2
Independent Claim
65 words
A method for driving a stepper motor wherein at least some steps of the motor rotation each comprise: supplying a first voltage to the motor for a time period, such time period being selected as a function of the required speed of the motor; and supplying a second lower voltage to the motor for the remainder of the motor step after the time period ends.
Claim 3
Dependent Claim
16 words
A method as in claim 1 wherein the time period increases with increasing required motor speed.
Claim 4
Dependent Claim
20 words
A method as in claim 2 wherein the time period increases as a linear function with increasing required motor speed.
Claim 5
Independent Claim
84 words
A method for driving a stepper motor wherein at least some steps of the motor rotation each comprise: beginning the motor step by supplying a first voltage to the motor; terminating the first voltage at a time defining a time period which is a function of the required speed of the motor, such time period increasing with increasing required motor speed; and supplying a second lower voltage to the motor for the remainder of the motor step upon the termination of the first voltage.
Claim 6
Independent Claim
84 words
A method for driving a stepper motor wherein at least some steps of the motor rotation each comprise: beginning the motor step by supplying a first voltage to the motor; terminating the first voltage at a time defining a time period which is a function of the required speed of the motor, such time period increasing with increasing required motor speed; and supplying a second lower voltage to the motor for the remainder of the motor step upon the termination of the first voltage.
References Cited (Backward Citations)
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US4156170A
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US4250544A
Cited
US4377847A
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US4377847B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-25 | 1988-06-25 | 1988-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-25 | 1992-06-25 | 1992-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-25 | 1996-06-25 | 1996-12-25 | $7700.00 | Window Closed / Lapsed |