US3562615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase control device for dc motor
Assignee: Panasonic Holdings Corp
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Filing: 1968-06-26
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Granted: 1971-02-09
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Expires: 1988-06-26
Abstract
Abstract A device for controlling the rotation of a rotary shaft driven by a DC motor so that the rotary shaft can rotate with a rotational phase which is in synchronism with the phase of a predetermined signal. The device is provided with a speed regulator so that the motor can drive the rotary shaft at approximately the number of revolutions corresponding to the oscillation frequency of the predetermined signal, and a signal representative of the phase difference is applied to the speed regulator so as to positively and steadily drive the motor in phasic synchronism and eliminate the hunting while and after the motor is pulled in.
Inventors
- 👤 Takuya Nasu
- 👤 Osahiko Yano
- 👤 Masahiro Deguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:15
CPC Classifications
H; H02; H02P; H02P23/00; H02P23/18; H02P23/186; Y; Y10; Y10S; Y10S388/00; Y10S388/90; Y10S388/902
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
152 words
A phase control device for a DC motor comprising a rotary output shaft whose rotational phase is to be controlled, a DC motor for driving said rotary output shaft, rotational phase detecting means for detecting the rotational phase of said rotary output shaft, a delay circuit which delays a reference synchronizing signal externally applied thereto and whose amount of delay is controlled by a voltage applied thereto, phase comparator means detecting a phase difference between the output signal of said rotational phase detecting means and the output signal of said delay circuit and providing an error signal corresponding to the phase difference, and a low-pass filter circuit supplied with the output signal delivered from said phase comparator means, the output signal delivered from said low-pass filter circuit being negatively fed back to said delay circuit as the signal for controlling the amount of delay thereby accomplishing a damping compensation for said motor.
Claim 2
Dependent Claim
152 words
A phase control device for a DC motor comprising a rotary output shaft whose rotational phase is to be controlled, a DC motor for driving said rotary output shaft, rotational phase detecting means for detecting the rotational phase of said rotary output shaft, a delay circuit which delays a reference synchronizing signal externally applied thereto and whose amount of delay is controlled by a voltage applied thereto, phase comparator means detecting a phase difference between the output signal of said rotational phase detecting means and the output signal of said delay circuit and providing an error signal corresponding to the phase difference, and a low-pass filter circuit supplied with the output signal delivered from said phase comparator means, the output signal delivered from said low-pass filter circuit being negatively fed back to said delay circuit as the signal for controlling the amount of delay thereby accomplishing a damping compensation for said motor.
Claim 3
Dependent Claim
33 words
The phase control device of claim 1 further comprising a speed control means for controlling the rotational speed of said DC motor by utilizing the back electromotive force developed in said DC motor.
Claim 4
Dependent Claim
42 words
The phase control device of claim 1 further comprising means for generating a signal which is representative of the number of revolutions of said rotary output shaft and means for controlling the rotational speed of said DC motor depending on said signal.
Claim 5
Dependent Claim
153 words
A phase control device for a DC motor comprising a rotary output shaft whose rotational phase is to be controlled, a DC motor for driving said rotary output shaft, rotational phase detecting means for detecting the rotational phase of said rotary output shaft, a delay circuit which delays the output signal of said rotational phase detecting means and whose amount of delay is controlled by a voltage applied thereto, phase comparator means which detects the phase difference between the output signal of said delay circuit and a reference synchronizing signal externally applied thereto and which provides an error signal corresponding to the phase difference, And a low-pass filter circuit supplied with the output signal delivered from said phase comparator means, the output signal of said low-pass filter circuit being negatively fed back to said delay circuit as the signal for controlling the amount of delay, thus achieving a damping compensation for said motor.
Claim 6
Dependent Claim
153 words
A phase control device for a DC motor comprising a rotary output shaft whose rotational phase is to be controlled, a DC motor for driving said rotary output shaft, rotational phase detecting means for detecting the rotational phase of said rotary output shaft, a delay circuit which delays the output signal of said rotational phase detecting means and whose amount of delay is controlled by a voltage applied thereto, phase comparator means which detects the phase difference between the output signal of said delay circuit and a reference synchronizing signal externally applied thereto and which provides an error signal corresponding to the phase difference, And a low-pass filter circuit supplied with the output signal delivered from said phase comparator means, the output signal of said low-pass filter circuit being negatively fed back to said delay circuit as the signal for controlling the amount of delay, thus achieving a damping compensation for said motor.
Claim 7
Dependent Claim
33 words
The phase control device of claim 4 further comprising a speed control means for controlling the rotational speed of said DC motor by utilizing the back electromotive force developed in said DC motor.
Claim 8
Dependent Claim
33 words
The phase control device of claim 4 further comprising a speed control means for controlling the rotational speed of said DC motor by utilizing the back electromotive force developed in said DC motor.
Claim 9
Dependent Claim
252 words
A phase control device for a DC motor comprising a rotary output shaft whose rotational phase is to be controlled, a DC motor for driving said output shaft, means forming a bridge circuit including said DC motor in one of its sides, said means being operative to compare a voltage proportional to the rotational speed of said DC motor with a reference voltage for deriving a difference voltage therebetween and to control the passage of current through a power supply control element connected to a power supply circuit for said bridge circuit, rotational phase detecting means for detecting the rotational phase of said rotary output shaft, a delay circuit which delays a reference synchronizing signal externally applied thereto and whose amount of delay is controlled by a voltage applied thereto, phase comparator means detecting a phase difference between the output signal of said rotational phase detecting means and the output signal of said delay circuit and providing an error signal corresponding to the phase difference, a low-pass filter circuit supplied with the output signal delivered from said phase comparator means, the output signal delivered from said low-pass filter being negatively fed back to said delay circuit as the signal for controlling the amount of delay, thereby accomplishing a damping compensation for said motor, and variable impedence means interposed between the detecting terminals of said bridge circuit and operative in response to the output of said phase comparator means to vary the degree of damping for the voltage detected by said bridge circuit.
Claim 10
Dependent Claim
252 words
A phase control device for a DC motor comprising a rotary output shaft whose rotational phase is to be controlled, a DC motor for driving said output shaft, means forming a bridge circuit including said DC motor in one of its sides, said means being operative to compare a voltage proportional to the rotational speed of said DC motor with a reference voltage for deriving a difference voltage therebetween and to control the passage of current through a power supply control element connected to a power supply circuit for said bridge circuit, rotational phase detecting means for detecting the rotational phase of said rotary output shaft, a delay circuit which delays a reference synchronizing signal externally applied thereto and whose amount of delay is controlled by a voltage applied thereto, phase comparator means detecting a phase difference between the output signal of said rotational phase detecting means and the output signal of said delay circuit and providing an error signal corresponding to the phase difference, a low-pass filter circuit supplied with the output signal delivered from said phase comparator means, the output signal delivered from said low-pass filter being negatively fed back to said delay circuit as the signal for controlling the amount of delay, thereby accomplishing a damping compensation for said motor, and variable impedence means interposed between the detecting terminals of said bridge circuit and operative in response to the output of said phase comparator means to vary the degree of damping for the voltage detected by said bridge circuit.
Claim 11
Dependent Claim
247 words
A phase control device for a DC motor comprising a rotary output shaft whose rotational phase is to be controlled, a DC motor for driving said rotary output shaft, means forming a bridge circuit including said DC motor in one of its sides, said means being operative to compare a voltage proportional to the rotational speed of said DC motor with a reference voltage for deriving a difference voltage therebetween and to control the passage of current through a power supply control element connected to a power supply circuit for said bridge circuit, rotational phase detecting means for detecting the rotational phase of said rotary output shaft, a delay circuit which delays the output signal of said rotational phase detecting means, and whose amount of delay is controlled by a voltage applied thereto, phase comparator means which detects the phase difference between the output signal of said delay circuit and a reference synchronizing signal externally applied thereto and which provides an error signal corresponding to the phase difference, a low-pass filter circuit supplied with the output signal delivered for said phase comparator means, the output signal of said low-pass filter circuit being negatively fed back to said delay circuit as the signal for controlling the amount of delay, and variable impedence means interposed between the detecting terminals of said bridge circuit and operative in response to the output of said phase comparator means to vary the degree of damping for the voltage detected by said bridge circuit.
Claim 12
Dependent Claim
247 words
A phase control device for a DC motor comprising a rotary output shaft whose rotational phase is to be controlled, a DC motor for driving said rotary output shaft, means forming a bridge circuit including said DC motor in one of its sides, said means being operative to compare a voltage proportional to the rotational speed of said DC motor with a reference voltage for deriving a difference voltage therebetween and to control the passage of current through a power supply control element connected to a power supply circuit for said bridge circuit, rotational phase detecting means for detecting the rotational phase of said rotary output shaft, a delay circuit which delays the output signal of said rotational phase detecting means, and whose amount of delay is controlled by a voltage applied thereto, phase comparator means which detects the phase difference between the output signal of said delay circuit and a reference synchronizing signal externally applied thereto and which provides an error signal corresponding to the phase difference, a low-pass filter circuit supplied with the output signal delivered for said phase comparator means, the output signal of said low-pass filter circuit being negatively fed back to said delay circuit as the signal for controlling the amount of delay, and variable impedence means interposed between the detecting terminals of said bridge circuit and operative in response to the output of said phase comparator means to vary the degree of damping for the voltage detected by said bridge circuit.
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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |