US3909693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for driving a pulse motor
Assignee: Fujitsu Ltd
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Filing: 1973-11-09
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Granted: 1975-09-30
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Expires: 1993-11-09
Abstract
Abstract System for driving an electric pulse motor, which provides n exciting coils, and generates, in accordance with command pulses, n exciting control voltages having a trapezoidal waveform with a phase difference which depends on the speed of said command pulses. Said n exciting control voltages are respectively supplied via linear current amplifiers to the exciting coils of the electric pulse motor. Therefore, by using exciting control voltages having a trapezoidal waveform, the movement of the electric pulse motor steps very smoothly.
Inventors
- 👤 Norito Yoshitake
- 👤 Hiroshi Usami
- 👤 Hiroshi Ishida
- 👤 Makoto Ohtomi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:48
CPC Classifications
H; H02; H02P; H02P8/00; H02P8/14; H02P8/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
118 words
A method for driving an electric pulse motor which provides n exciting coils and moves in response to command pulses, which comprises the steps of generating selectively, in accordance with said command pulses, n exciting control voltages which have approximate trapezoidal waveforms inclined at the rise and fall portions, said exciting control voltages being generated, in order, with a phase difference which depends on the speed of said command pulses, amplifying said exciting control voltages respectively by linear current amplifiers each of which is connected respectively to said n exciting coils, applying the amplified outputs of said linear current amplifiers respectively to said exciting coils of said motor, and thereby smoothing the movement of said electric pulse motor.
Claim 2
Independent Claim
118 words
A method for driving an electric pulse motor which provides n exciting coils and moves in response to command pulses, which comprises the steps of generating selectively, in accordance with said command pulses, n exciting control voltages which have approximate trapezoidal waveforms inclined at the rise and fall portions, said exciting control voltages being generated, in order, with a phase difference which depends on the speed of said command pulses, amplifying said exciting control voltages respectively by linear current amplifiers each of which is connected respectively to said n exciting coils, applying the amplified outputs of said linear current amplifiers respectively to said exciting coils of said motor, and thereby smoothing the movement of said electric pulse motor.
Claim 3
Independent Claim
113 words
A system for driving an electric pulse motor which provides n exciting coils and moves in response to command pulses, comprising, means for generating selectively, in accordance with said command pulses, n exciting control voltages which have approximate tapezoidal waveforms inclined at the rise and fall portions, said exciting control voltages being generated, in order, with a phase difference which depends on the speed of said command pulses, amplifying means including n linear current amplifiers which amplify said exciting control voltages respectively and each of which is connected respectively to said n exciting coils, means for applying the amplified outputs of said linear current amplifiers respectively to said exciting coils of said motor.
Claim 4
Independent Claim
113 words
A system for driving an electric pulse motor which provides n exciting coils and moves in response to command pulses, comprising, means for generating selectively, in accordance with said command pulses, n exciting control voltages which have approximate tapezoidal waveforms inclined at the rise and fall portions, said exciting control voltages being generated, in order, with a phase difference which depends on the speed of said command pulses, amplifying means including n linear current amplifiers which amplify said exciting control voltages respectively and each of which is connected respectively to said n exciting coils, means for applying the amplified outputs of said linear current amplifiers respectively to said exciting coils of said motor.
Claim 5
Dependent Claim
74 words
The system for driving an electric pulse motor according to claim 2, wherein said generating means comprises a pulse multiplier circuit for producing a series of pulses by multiplying said command pulses, reversible counting means for counting reversibly said series of pulses in accordance with the sign of said command pulses, and digital to analogue converting means for generating said n exciting control voltages in accordance with the contents of said reversible counting means.
Claim 6
Dependent Claim
51 words
The method of claim 1 in which said generating step includes multiplying said command pulses n times for producing a series of pulses, counting reversibly said series of pulses in accordance with the sign of said command pulses, and generating said n exciting control voltages in accordance with the reversible counting.
References Cited (Backward Citations)
US3512066A
Cited
US3445741A
Cited
US3612973A
Cited
US3621358A
Cited
US3777246A
Cited
US3696278A
Cited
US3678358A
Cited
US3678352A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |