US4591767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for reciprocating drive motor
Assignee: Ricoh Co Ltd
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Filing: 1985-04-29
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Granted: 1986-05-27
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Expires: 2005-04-29
Abstract
Abstract A control system for a reciprocating drive motor includes a phase comparator which determines a difference in phase between pulses synchronous with the rotation of a motor and reference pulses whose period corresponds to a specified velocity, to produce a pulse while any phase difference exists and in accordance with the advancement/retardation of the phase. A charge pump circuit is connected between the phase comparator and a loop filter of the control system to produce a voltage which is zero level when the phase difference is zero, and positive (negative) or negative (positive) with respect to the zero level in accordance with the advancement/retardation of the phase. Until the motor enters a constant velocity control mode, the output of the loop filter is maintained zero level by switching means. In a constant velocity control mode, while the phase difference is zero (meaning that the motor is in rotation at a specified velocity), the output voltages of the charge pump and loop filter are kept zero level regardless of the specified velocity. When the operation mode shifts from a start mode to a constant velocity control mode, the output voltage of the loop filter is held zero level regardless of the specified velocity. The control system further includes compensation voltage supply means for energizing the motor with a current large enough to overcome frictional forces of a system which is driven by the motor.
Inventors
- 👤 Hiroshi Koide
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:11
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/29; H02P7/2913; H02P7/03; H02P7/04; H02P7/05; Y; Y10; Y10S; Y10S388/00; Y10S388/90; Y10S388/902; Y10S388/907; Y10S388/909; Y10S388/912
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
324 words
A control system for a reciprocating drive motor comprising: loop filter means; motor drive circuit means for drivingly energizing the motor in accordance with an output signal of the loop filter means; selection circuit means for selecting one of a start mode and a constant velocity control mode; reference pulse generator means for generating reference pulses whose period corresponds to a specified velocity; rotary encoder means for generating pulses synchronous with the rotation of the motor; phase comparator means for comparing the reference pusles with the synchronous pulses in phase to produce an output representing the resultant phase difference; charge pump circuit means connected between the phase comparator means and the loop filter means to produce an output voltage in accordance with the phase difference and to produce a zero output voltage when the phase difference is zero; and switching means responsive to the selection circuit means for controlling the loop filter means to produce a zero output voltage in the start mode and to produce an output voltage which varies in accordance with the output voltage of the charge pump circuit means in the velocity control mode; the charge pump circuit means producing a zero output voltage when the phase difference is zero; the motor drive circuit means comprising compensating voltage supply means for supplying the motor with a current large enough to overcome frictional forces of a system driven by the motor during the start mode and the velocity control mode, said predetermined output voltage of the loop filter means being zero; the control system further comprising analog feedback motor speed control means controlled by the selection circuit means to be connected to the motor drive circuit means, the control system further comprising means for disconnecting the output of the loop filter from the analog motor speed control means in the start mode and connecting the output of the loop filter to the motor drive circuit means in the velocity control mode.
Claim 2
Dependent Claim
324 words
A control system for a reciprocating drive motor comprising: loop filter means; motor drive circuit means for drivingly energizing the motor in accordance with an output signal of the loop filter means; selection circuit means for selecting one of a start mode and a constant velocity control mode; reference pulse generator means for generating reference pulses whose period corresponds to a specified velocity; rotary encoder means for generating pulses synchronous with the rotation of the motor; phase comparator means for comparing the reference pusles with the synchronous pulses in phase to produce an output representing the resultant phase difference; charge pump circuit means connected between the phase comparator means and the loop filter means to produce an output voltage in accordance with the phase difference and to produce a zero output voltage when the phase difference is zero; and switching means responsive to the selection circuit means for controlling the loop filter means to produce a zero output voltage in the start mode and to produce an output voltage which varies in accordance with the output voltage of the charge pump circuit means in the velocity control mode; the charge pump circuit means producing a zero output voltage when the phase difference is zero; the motor drive circuit means comprising compensating voltage supply means for supplying the motor with a current large enough to overcome frictional forces of a system driven by the motor during the start mode and the velocity control mode, said predetermined output voltage of the loop filter means being zero; the control system further comprising analog feedback motor speed control means controlled by the selection circuit means to be connected to the motor drive circuit means, the control system further comprising means for disconnecting the output of the loop filter from the analog motor speed control means in the start mode and connecting the output of the loop filter to the motor drive circuit means in the velocity control mode.
Claim 3
Dependent Claim
22 words
A control system as claimed in claim 1, in which the motor drive circuit means comprises a switching type servo amplifier circuit.
Claim 4
Dependent Claim
22 words
A control system as claimed in claim 1, in which the motor drive circuit means comprises a bridge type servo amplifier circuit.
Claim 5
Dependent Claim
238 words
A control system for a reciprocating drive motor comprising: loop filter means; motor drive circuit means for drivingly energizing the motor in accordance with an output signal of the loop filter means; selection circuit means for selecting one of a start mode and a constant velocity control mode; reference pulse generator means for generating reference pulses whose period corresponds to a specified velocity; rotary encoder means for generating pulses synchronous with the rotation of the motor; phase comparator means for comparing the reference pulses with the synchronous pulses in phase to produce an output representing the resultant phase difference; charge pump circuit means connected between the phase comparator means and the loop filter means to produce an output voltage in accordance with the phase difference; and switching means responsive to the selection circuit means for controlling the loop filter means to produce a predetermined output voltage in the start mode and to produce an output voltage which varies in accordance with the output voltage of the charge pump circuit means in the velocity control mode; the control system further comprising analog feedback motor speed control means connected to the motor drive circuit means, the control system further comprising means for combining an output signal from the analog feedback motor speed control means with the output signal from the loop filter means for control of the motor speed in both the start mode and the constant velocity control mode.
Claim 6
Dependent Claim
238 words
A control system for a reciprocating drive motor comprising: loop filter means; motor drive circuit means for drivingly energizing the motor in accordance with an output signal of the loop filter means; selection circuit means for selecting one of a start mode and a constant velocity control mode; reference pulse generator means for generating reference pulses whose period corresponds to a specified velocity; rotary encoder means for generating pulses synchronous with the rotation of the motor; phase comparator means for comparing the reference pulses with the synchronous pulses in phase to produce an output representing the resultant phase difference; charge pump circuit means connected between the phase comparator means and the loop filter means to produce an output voltage in accordance with the phase difference; and switching means responsive to the selection circuit means for controlling the loop filter means to produce a predetermined output voltage in the start mode and to produce an output voltage which varies in accordance with the output voltage of the charge pump circuit means in the velocity control mode; the control system further comprising analog feedback motor speed control means connected to the motor drive circuit means, the control system further comprising means for combining an output signal from the analog feedback motor speed control means with the output signal from the loop filter means for control of the motor speed in both the start mode and the constant velocity control mode.
Claim 7
Dependent Claim
134 words
A control system for a reciprocating drive motor comprising: selection circuit means for selecting one of a start mode and a constant speed control mode; a phase locked motor speed control means having first means for producing a phase error output voltage and second means responsive to the selection circuit means and the first means for producing a predetermined output voltage in the start mode and an output voltage which varies in accordance with the phase error output voltage in the constant speed control mode; and analog feedback motor speed control means connected to the phase locked motor speed control means, the control system further comprising means for combining an output voltage from the analog feedback motor speed control means with the output voltage from the second means for control of the motor speed.
Claim 8
Dependent Claim
134 words
A control system for a reciprocating drive motor comprising: selection circuit means for selecting one of a start mode and a constant speed control mode; a phase locked motor speed control means having first means for producing a phase error output voltage and second means responsive to the selection circuit means and the first means for producing a predetermined output voltage in the start mode and an output voltage which varies in accordance with the phase error output voltage in the constant speed control mode; and analog feedback motor speed control means connected to the phase locked motor speed control means, the control system further comprising means for combining an output voltage from the analog feedback motor speed control means with the output voltage from the second means for control of the motor speed.
Claim 9
Dependent Claim
50 words
A motor speed control system as claimed in claim 5, in which the output signal from the analog feedback motor speed control means is combined with the output signal from the second means for control of the motor speed in both the start mode and the constant speed control mode.
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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) | 1989-05-26 | 1989-11-25 | 1990-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-26 | 1993-11-25 | 1994-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-26 | 1997-11-25 | 1998-05-27 | $7700.00 | Window Closed / Lapsed |