US3764868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronizing plural motor control system for machines
Assignee: Eaton Corp
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Filing: 1971-06-10
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Granted: 1973-10-09
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Expires: 1991-06-10
Abstract
Abstract Control circuit for synchronizing machines in which a master velocity signal for controlling speed of machines is also converted to provide a repeating digital master phase cycle which is compared with a digital number from an absolute encoder on each machine for indicating machine position and to develop an error signal to synchronize the machines to the master cycle. Offsetting means is operable to change the phase relationship of the machine to the master cycle and stop means for stopping the machines in a phase relation to the master cycle which is different from the operating phase relationship.
Inventors
- 👤 Callaghan G O
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:07
CPC Classifications
B; B30; B30B; B30B15/00; B30B15/14; B30B15/146; B30B15/148
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
352 words
A control system for synchronizing the work cycles of a plurality of cyclic machines, each of said machines to be operated through a plurality of work cycles at a desired speed and to be synchronized in a predetermined phase relationship with respect to each other, means providing an analog velocity signal for controlling the speed of operation of said machines to opeRate said machines at said desired speed, individual velocity control means responsive to the velocity signal for driving each of said machines at a speed which is a function of the velocity signal including means for receiving an error signal input for modifying the velocity of the respective machine in response to said velocity signal, electrical means independent of said machine to be synchronized and responsive to said velocity signal to electrically convert said velocity signal to master phase signals representing subdivisions of a master cycle and to a frequency which varies cyclically with time as a function of the magnitude of the velocity signal, the instantaneous magnitude of said master phase signals indicating the instantaneous phases of the master machine cycle to which said machines are to be synchronized, encoding means driven by each machine to be synchronized and providing a machine position signal indicating the instantaneous phase of the respective machine in its work cycle, comparing means for comparing the machine phase signals from a machine with the master phase signals and providing an error signal to the said input of said velocity control means for the machine to change the speed of the machine to compensate for deviations in phase, said encoding means comprising an absolute position encoder, presettable means for stopping said machine at a predetermined phase position comprising a stop position different from the synchronized phase position, and stop control means for comparing said stop position and the machine phase signals and providing a control signal to effect a stopping of the machine at a phase relative to the master cycle different from the synchronized phase, said stop control means comprising means controlled by the speed of said machine for rendering said stop control means effective.
Claim 2
Dependent Claim
352 words
A control system for synchronizing the work cycles of a plurality of cyclic machines, each of said machines to be operated through a plurality of work cycles at a desired speed and to be synchronized in a predetermined phase relationship with respect to each other, means providing an analog velocity signal for controlling the speed of operation of said machines to opeRate said machines at said desired speed, individual velocity control means responsive to the velocity signal for driving each of said machines at a speed which is a function of the velocity signal including means for receiving an error signal input for modifying the velocity of the respective machine in response to said velocity signal, electrical means independent of said machine to be synchronized and responsive to said velocity signal to electrically convert said velocity signal to master phase signals representing subdivisions of a master cycle and to a frequency which varies cyclically with time as a function of the magnitude of the velocity signal, the instantaneous magnitude of said master phase signals indicating the instantaneous phases of the master machine cycle to which said machines are to be synchronized, encoding means driven by each machine to be synchronized and providing a machine position signal indicating the instantaneous phase of the respective machine in its work cycle, comparing means for comparing the machine phase signals from a machine with the master phase signals and providing an error signal to the said input of said velocity control means for the machine to change the speed of the machine to compensate for deviations in phase, said encoding means comprising an absolute position encoder, presettable means for stopping said machine at a predetermined phase position comprising a stop position different from the synchronized phase position, and stop control means for comparing said stop position and the machine phase signals and providing a control signal to effect a stopping of the machine at a phase relative to the master cycle different from the synchronized phase, said stop control means comprising means controlled by the speed of said machine for rendering said stop control means effective.
Claim 3
Dependent Claim
16 words
A control system according to claim 1 wherein said encoding means comprises an absolute position encoder.
Claim 4
Dependent Claim
49 words
A control system as defined in claim 1 wherein said comparing means includes means for receiving said master phase signals and modifying the magnitude of the master phase signals with which the phase signal of the machine is compared to introduce a phase offset in the mechanism being synchronized.
Claim 5
Dependent Claim
23 words
A control system according to claim 3 wherein said encoding means comprising an absolute position encoder having a plurality of binary zone tracks.
Claim 6
Dependent Claim
59 words
A control system as defined in claim 1 wherein said electrical means for providing a master phase signal comprises a voltage-to-frequency converting circuit for providing a signal of a frequency which is a function of the velocity signal and a master counter for counting said signal frequency, the count of the counter indicating the phase of the master cycle.
Claim 7
Dependent Claim
28 words
A control system as defined in claim 5 including offset means for modifying the magnitude of the master phase signal with which the machine phase signal is compared.
Claim 8
Dependent Claim
30 words
In a control system as defined in claim 6 wherein said offset means is a circuit for adding or subtracting a predetermined count from the count in said master counter.
Claim 9
Dependent Claim
56 words
A control system as defined in claim 1 wherein said machine encoding means provides parallel binary signals for indicating phase and comprises means for converting parallel information from the encoding means to serial information for transmission to the said comparing means, said comparing means including means for converting serial information from said machine to parallel information.
Claim 10
Dependent Claim
81 words
A control system as defined in claim 1 wherein said master phase signal and said machine phase signal are digital and said comparing means comprises a circuit for determining the difference between said machine phase signal and said master phase signal and includes means for establishing a carry for each of the signals at the end of a cycle and for maintaining the carry as a part of the phase signal until both the machine and master cycles have been completed.
Claim 11
Dependent Claim
188 words
In a control system for synchronizing the operation of a cyclic machine to a reference, first means repetitively providing successive master binary coded digital phase signals indicating successive phases of a single master machine cycle, and coding means driven by said machine and providing successive binary coded digital phase signals representing successive phases of one cycle of the machine, means for comparing the master binary coded digital phase signals and the machine binary coded digital phase signals to determine the error in synchronization of the phase of the machine with respect to the phase of the master cycle, means responsive to said comparing means to bring the machine into synchronism with the master machine cycle to maintain a fixed phase relationship between the machine cycle and the master cycle, and means for changing the fixed phase relationship of the machine cycle to the master cycle comprising an adding circuit for algebraically adding a predetermined increment to one of said phase signals, the output of said adding circuit being connected to said comparing means to be compared with the other of said phase signals to provide said error signal.
Claim 12
Dependent Claim
188 words
In a control system for synchronizing the operation of a cyclic machine to a reference, first means repetitively providing successive master binary coded digital phase signals indicating successive phases of a single master machine cycle, and coding means driven by said machine and providing successive binary coded digital phase signals representing successive phases of one cycle of the machine, means for comparing the master binary coded digital phase signals and the machine binary coded digital phase signals to determine the error in synchronization of the phase of the machine with respect to the phase of the master cycle, means responsive to said comparing means to bring the machine into synchronism with the master machine cycle to maintain a fixed phase relationship between the machine cycle and the master cycle, and means for changing the fixed phase relationship of the machine cycle to the master cycle comprising an adding circuit for algebraically adding a predetermined increment to one of said phase signals, the output of said adding circuit being connected to said comparing means to be compared with the other of said phase signals to provide said error signal.
Claim 13
Dependent Claim
70 words
A control system as defined in claim 10 in which said comparing means comprises a circuit for determining the difference between said machine phase signal and said master phase signal and includes means for establishing a carry for each of the signals at the end of a cycle and for maintaining the carry as a part of the phase signal until both the machine and master cycles have been completed.
Claim 14
Dependent Claim
23 words
A control system according to claim 10 wherein said encoding means comprises an absolute position encoder having a plurality of binary zone tracks.
Claim 15
Dependent Claim
54 words
A control system as defined in claim 12 wherein said encoding means comprises means for registering bits from said binary zone tracks in parallel and for transmitting said bits serially to said comparing means, said comparing means including means for receiving said bits in a serial manner and converting said bits to parallel form.
Claim 16
Dependent Claim
58 words
A control system as defined in claim 2 wherein said encoding means comprises binary zone tracks and means for registering bits from said binary zone tracks in parallel and for transmitting said bits serially to said comparing means, said comparing means including means for receiving said bits in a serial manner and converting said bits to parallel form.
Claim 17
Dependent Claim
182 words
A control system for synchronizing the work cycle of a cyclic machine to a reference, means providing a velocity signal for controlling said machine, velocity control means responsive to the velocity signal for driving said machine at a speed which is a function of the velocity signal comprising means for receiving an error signal for modifying the velocity of the machine, electrical circuit means responsive to said velocity signal to electrically convert said velocity signal to master phase signals which vary with time and whose magnitude indicates the instantaneous phase of a master machine cycle to which said machine is to be synchronized, encoding means driven by each machine and providing a machine position signal indicating the instantaneous phase of the respective machine in its work cycle, presettable means settable to a predetermined phase position for stopping said machine at the phase position, and stop control means for comparing said stop position and the machine phase signals and providing a control signal to effect a stopping of the machine at a phase relative to the master cycle different from the synchronized phase.
Claim 18
Dependent Claim
182 words
A control system for synchronizing the work cycle of a cyclic machine to a reference, means providing a velocity signal for controlling said machine, velocity control means responsive to the velocity signal for driving said machine at a speed which is a function of the velocity signal comprising means for receiving an error signal for modifying the velocity of the machine, electrical circuit means responsive to said velocity signal to electrically convert said velocity signal to master phase signals which vary with time and whose magnitude indicates the instantaneous phase of a master machine cycle to which said machine is to be synchronized, encoding means driven by each machine and providing a machine position signal indicating the instantaneous phase of the respective machine in its work cycle, presettable means settable to a predetermined phase position for stopping said machine at the phase position, and stop control means for comparing said stop position and the machine phase signals and providing a control signal to effect a stopping of the machine at a phase relative to the master cycle different from the synchronized phase.
Claim 19
Dependent Claim
17 words
A control system as defined in claim 15 wherein said encoding means comprises an absolute position encoder.
Claim 20
Dependent Claim
149 words
In a control system for synchronizing the operation of a cyclic machine to a reference, first means providing successive master digital phase signals indicating successive phases of a master machine cycle, encoding means driven by said machine and providing successive digital signals representing successive phases of the machine cycle, means for comparing thE master digital phase signals and the machine phase signals to determine the error in synchronization of the machine with respect to the master cycle, means responsive to said comparing means to bring the machine into synchronism with the master machine cycle, presettable means presettable to a stop position for stopping said machine at a predetermined phase position, and stop control means for compariing said stop position and the machine phase signals and providing a control signal to effect a stopping of the machine at a phase relative to the master cycle different from the synchronized phase.
Claim 21
Dependent Claim
149 words
In a control system for synchronizing the operation of a cyclic machine to a reference, first means providing successive master digital phase signals indicating successive phases of a master machine cycle, encoding means driven by said machine and providing successive digital signals representing successive phases of the machine cycle, means for comparing thE master digital phase signals and the machine phase signals to determine the error in synchronization of the machine with respect to the master cycle, means responsive to said comparing means to bring the machine into synchronism with the master machine cycle, presettable means presettable to a stop position for stopping said machine at a predetermined phase position, and stop control means for compariing said stop position and the machine phase signals and providing a control signal to effect a stopping of the machine at a phase relative to the master cycle different from the synchronized phase.
Claim 22
Dependent Claim
29 words
A control system as defined in claim 17 wherein said stop control means comprises means controlled by the speed of said machine for rendering said stop control means effective.
Claim 23
Dependent Claim
299 words
A control system for synchronizing the phase of work cycles of a plurality of cyclic machines, each of said machines to be operated through a plurality of work cycles at a single desired speed and to be synchronized in a predetermined fired phase relationship with respect to each ohter, meaans providing an analog velocity signal for controlling the speed of operation of said machine to operate said pluarlity machines at one desired speed, individual velocity control means responsive to the velocity signal for driving each of said machines at said one speed which is a function of the velocity signal including means for receiving an error signal input for modifying the velocity of the respective machine in response to said velocity signal, electrical means independent of said machines to be synchronized and responsive to said velocity signal to electrically convert said velocity signal to binary coded master phase signals representing subdivisions of a master cycle and to a cycle frequency which varies cyclically with time as a function of the magnitude of the velocity signal, the instantaneous magnitude of said master phase signals indicating the instantaneous phases of the master machine cycle to which said machines are to be synchronized, encoding means driving by each machine to be synchronized and providing a binary coded machine phase signal indicating the instantaneous phase of the respective machine in its work cycle, and comparing means for comparing the machine phase signals from each of the machines with the master phase signals and providing an error signal to the said input of the velocity control means for the machine to change the speed of the machine to compensate for deviations in phase to maintain a fixed phase relationship between the operating cycle of the machine and the cycle of the master phase signals.
Claim 24
Dependent Claim
299 words
A control system for synchronizing the phase of work cycles of a plurality of cyclic machines, each of said machines to be operated through a plurality of work cycles at a single desired speed and to be synchronized in a predetermined fired phase relationship with respect to each ohter, meaans providing an analog velocity signal for controlling the speed of operation of said machine to operate said pluarlity machines at one desired speed, individual velocity control means responsive to the velocity signal for driving each of said machines at said one speed which is a function of the velocity signal including means for receiving an error signal input for modifying the velocity of the respective machine in response to said velocity signal, electrical means independent of said machines to be synchronized and responsive to said velocity signal to electrically convert said velocity signal to binary coded master phase signals representing subdivisions of a master cycle and to a cycle frequency which varies cyclically with time as a function of the magnitude of the velocity signal, the instantaneous magnitude of said master phase signals indicating the instantaneous phases of the master machine cycle to which said machines are to be synchronized, encoding means driving by each machine to be synchronized and providing a binary coded machine phase signal indicating the instantaneous phase of the respective machine in its work cycle, and comparing means for comparing the machine phase signals from each of the machines with the master phase signals and providing an error signal to the said input of the velocity control means for the machine to change the speed of the machine to compensate for deviations in phase to maintain a fixed phase relationship between the operating cycle of the machine and the cycle of the master phase signals.
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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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |