Patent US4949393A successfully refreshed from Google Patents.
US4949393A
Expired / Lapsed
US
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Motor rotation speed controlling apparatus
Assignee: Omron Corp
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Filing: 1988-01-19
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Granted: 1990-08-14
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Expires: 2008-01-19
Abstract
Abstract The present invention is directed to a motor rotation speed controlling apparatus including a comparator, a detecting circuit for detecting a feedback signal of a motor, a motor driving transistor, and a circuit for changing the level of a constant voltage fed to the comparator. The comparator compares a saw-tooth voltage with a constant voltage and outputs a signal which has a duty cycle corresponding to the result of the comparison. The motor driving transistor drives the motor in response to the output signal from the comparator. To change the duty cycle of the output signal from the comparator, a circuit is used that changes the level of the constant voltage in response to a feedback signal detected by the detecting circuit.
Inventors
- 👤 Koji Ohmori
- 👤 Yutaka Nozaki
- 👤 Hirofumi Endo
- 👤 Hidetoshi Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:38
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/29; H02P7/2913; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/915; Y10S388/917; Y10S388/92
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
125 words
A motor rotation speed controlling apparatus comprising: means for generating a saw-tooth voltage; setting means for setting a constant voltage; comparison means for comparing the saw-tooth voltage with the constant voltage and for outputting a signal which has a duty cycle corresponding to the result of the comparison; driving means for providing a driving current to drive a motor in response to the signal from said comparison means, wherein said driving means comprises a transistor having a collector voltage; and circuit means for changing the level of said constant voltage set by said setting means in response to a feedback signal of said motor, wherein said circuit means comprises means for detecting said collector voltage and means for converting said collector voltage into a current
Claim 2
Dependent Claim
125 words
A motor rotation speed controlling apparatus comprising: means for generating a saw-tooth voltage; setting means for setting a constant voltage; comparison means for comparing the saw-tooth voltage with the constant voltage and for outputting a signal which has a duty cycle corresponding to the result of the comparison; driving means for providing a driving current to drive a motor in response to the signal from said comparison means, wherein said driving means comprises a transistor having a collector voltage; and circuit means for changing the level of said constant voltage set by said setting means in response to a feedback signal of said motor, wherein said circuit means comprises means for detecting said collector voltage and means for converting said collector voltage into a current
Claim 3
Dependent Claim
22 words
The apparatus as in claim 1, wherein said setting means includes a variable resistor and a resistor connected to said variable resistor.
Claim 4
Dependent Claim
24 words
The apparatus as in claim 1, wherein said circuit means includes a Zener diode and a current mirror circuit connected to said Zener diode.
Claim 5
Dependent Claim
14 words
The apparatus as in claim 1, wherein said driving means includes a power transistor.
Claim 6
Dependent Claim
33 words
The apparatus as claimed in claim 1, wherein said means for detecting said collector voltage includes a detecting resistor for detecting a feedback signal and a smoothing capacitor connected to said detecting resistor.
Claim 7
Independent Claim
91 words
A method for controlling the rotation of a motor, said method comprising: generating a saw-tooth voltage; setting a constant voltage; comparing said saw-tooth voltage to said constant voltage and outputting a signal having a duty cycle corresponding to the result of the comparison; driving a motor with a transistor in response to said signal; generating a feedback signal by detecting a collector voltage of said transistor and converting said collector voltage into a current; and changing the level of said constant voltage in response to said feedback signal from the motor,
Claim 8
Independent Claim
91 words
A method for controlling the rotation of a motor, said method comprising: generating a saw-tooth voltage; setting a constant voltage; comparing said saw-tooth voltage to said constant voltage and outputting a signal having a duty cycle corresponding to the result of the comparison; driving a motor with a transistor in response to said signal; generating a feedback signal by detecting a collector voltage of said transistor and converting said collector voltage into a current; and changing the level of said constant voltage in response to said feedback signal from the motor,
Claim 9
Dependent Claim
125 words
A motor rotation speed controlling apparatus comprising: means for generating a saw-toth voltage; setting means for setting a constant voltage; comparison means for comparing the saw-tooth voltage with the constant voltage and for outputting a signal which has a duty cycle corresponding to the result of the comparison; driving means for providing a driving current to drive a motor in response to the signal from said comparison means, wherein said driving means comprises a transistor having a drain voltage; and circuit means for changing the level of said constant voltage set by said setting means in response to a feedback signal of said motor, wherein said circuit means comprises means for detecting said drain voltage and means for converting said drain voltage into a current.
Claim 10
Dependent Claim
125 words
A motor rotation speed controlling apparatus comprising: means for generating a saw-toth voltage; setting means for setting a constant voltage; comparison means for comparing the saw-tooth voltage with the constant voltage and for outputting a signal which has a duty cycle corresponding to the result of the comparison; driving means for providing a driving current to drive a motor in response to the signal from said comparison means, wherein said driving means comprises a transistor having a drain voltage; and circuit means for changing the level of said constant voltage set by said setting means in response to a feedback signal of said motor, wherein said circuit means comprises means for detecting said drain voltage and means for converting said drain voltage into a current.
Claim 11
Dependent Claim
24 words
The apparatus as in claim 7, wherein said circuit means includes a Zener diode and a current mirror circuit connected to said Zener diode.
Claim 12
Independent Claim
91 words
A method for controlling the rotation of a motor, said method comprising: generating a saw-tooth voltage; setting a constant voltage; comparing said saw-tooth voltage to said constant voltage and outputting a signal having a duty cycle corresponding to the result of the comparison; driving a motor with a transistor in response to said signal; generating a feedback signal by detecting a drain voltage of said transistor and converting said drain voltage into a current; and changing the level of said constant voltage in response to said feedback signal from the motor.
Claim 13
Independent Claim
91 words
A method for controlling the rotation of a motor, said method comprising: generating a saw-tooth voltage; setting a constant voltage; comparing said saw-tooth voltage to said constant voltage and outputting a signal having a duty cycle corresponding to the result of the comparison; driving a motor with a transistor in response to said signal; generating a feedback signal by detecting a drain voltage of said transistor and converting said drain voltage into a current; and changing the level of said constant voltage in response to said feedback signal from the motor.
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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) | 1993-08-13 | 1994-02-12 | 1994-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-13 | 1998-02-12 | 1998-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-13 | 2002-02-12 | 2002-08-14 | $7700.00 | Window Closed / Lapsed |