US3600655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for controlling the speed of a plurality of motors which have output shafts to drive elements that are interrelated
Assignee: Beloit Corp
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Filing: 1968-05-21
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Granted: 1971-08-17
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Expires: 1988-05-21
Abstract
Abstract A motor control system for a papermaking machine formed of a rectifier and inverter circuit connected between an alternating current source of fixed frequency and a plurality of synchronous motors of the papermaking machine which are to be driven with a frequency which can be varied. A single master oscillator provides a common source for a plurality of divider circuits, each of which are connected to the respective inverter circuit associated with each individual motor. Each divider circuit is formed of a ''''runup'''' speed control circuit which enables gradual increase of motor speed, a speed control logic circuit which provides a ''''draw'''' control between individual motors, and a polyphase generator to provide a polyphase voltage which is applied to the individual motors. Each speed control logic circuit is variable to control the speed of individual motors, and, consequently, the ''''draw'''' between the motors. The master oscillator is variable to control the speed of all motors jointly and concurrently.
Inventors
- 👤 Richard A Karlin
- 👤 Edgar J Justus
- 👤 Leroy H Busker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:45
CPC Classifications
H; H02; H02P; H02P5/00; H02P5/74; H02P5/46; H02P5/50; H02P5/51
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
300 words
An electronic drive system for a multisection processing machine capable of maintaining a fixed ratio of speed between various sections of the machine and allowing simultaneous adjustment of the entire machine comprising: a plurality of driving means each connected to drive a different section of said machine; a source of three-phase alternating power; a plurality of rectifier circuits each connected to said source of alternating power whereby to convert the three-phase alternating power to direct current; a plurality of direct current circuits each connected to one of said plurality of rectifier circuits so as to filter the output of the rectifier and provide a feedback signal; a plurality of inverter commutation circuits respectively connected to the outputs of said direct current circuits for providing a commutation control; a plurality of inverter bridges each providing outputs to said plurality of driving means and whereby the oUtputs vary in amplitude and frequency, said plurality of inverter bridges receiving the outputs of said direct current circuits through said inverter commutation circuits; a plurality of polyphase frequency sources for controlling the frequency and amplitude of the inputs to each driving means and supplying outputs to said inverter bridges and said inverter commutation circuits; a plurality of direct current regulators each receiving inputs from one of said plurality of polyphase frequency sources and from one of said direct current circuits so as to develop a feedback amplitude control signal; and a plurality of rectifier phase control circuits each receiving the output of said one of said DC regulators, and supplying an input to one of said rectifier circuits whereby the amplitude of the rectifier circuits is controlled such that each of said plurality of driving means operates at a speed proportional to the output of the respective polyphase frequency source to which it is connected.
Claim 2
Dependent Claim
300 words
An electronic drive system for a multisection processing machine capable of maintaining a fixed ratio of speed between various sections of the machine and allowing simultaneous adjustment of the entire machine comprising: a plurality of driving means each connected to drive a different section of said machine; a source of three-phase alternating power; a plurality of rectifier circuits each connected to said source of alternating power whereby to convert the three-phase alternating power to direct current; a plurality of direct current circuits each connected to one of said plurality of rectifier circuits so as to filter the output of the rectifier and provide a feedback signal; a plurality of inverter commutation circuits respectively connected to the outputs of said direct current circuits for providing a commutation control; a plurality of inverter bridges each providing outputs to said plurality of driving means and whereby the oUtputs vary in amplitude and frequency, said plurality of inverter bridges receiving the outputs of said direct current circuits through said inverter commutation circuits; a plurality of polyphase frequency sources for controlling the frequency and amplitude of the inputs to each driving means and supplying outputs to said inverter bridges and said inverter commutation circuits; a plurality of direct current regulators each receiving inputs from one of said plurality of polyphase frequency sources and from one of said direct current circuits so as to develop a feedback amplitude control signal; and a plurality of rectifier phase control circuits each receiving the output of said one of said DC regulators, and supplying an input to one of said rectifier circuits whereby the amplitude of the rectifier circuits is controlled such that each of said plurality of driving means operates at a speed proportional to the output of the respective polyphase frequency source to which it is connected.
Claim 3
Dependent Claim
19 words
An electronic drive system according to claim 1 wherein the plurality of driving means comprise alternating current synchronous motors.
Claim 4
Dependent Claim
16 words
An electronic drive system according to claim 2 wherein the alternating current motors are polyphase motors.
Claim 5
Dependent Claim
19 words
An electronic drive system according to claim 1 wherein the plurality of inverter commutation circuits produces a polyphase output.
Claim 6
Dependent Claim
99 words
An electronic drive system for a multisection processing machine according to claim 1 wherein said plurality of polyphase frequency sources comprise: a variable frequency oscillator; a plurality of dividers which receive outputs from said variable frequency oscillator to divide the frequency to a predetermined value; a plurality of gates connected to said plurality of dividers; a plurality of preset registers connected to said plurality of gates; a plurality of multiphase generators connected to the outputs of said dividers whereby the outputs thereof comprise desired frequencies; and the outputs of said multiphase generators connected to said plurality of inverter bridges.
Claim 7
Dependent Claim
31 words
An electronic drive system according to claim 5 wherein the means for controlling the dividing factor of each divider gate comprises, a plurality of preset registers connected to each divider gate.
Claim 8
Dependent Claim
16 words
An electronic drive system according to claim 6 comprising register-adjusting means connected to each preset register.
Claim 9
Dependent Claim
57 words
An electronic drive system according to claim 1 including a regenerator circuit connected across the input of one of said inverter bridges and supplying an output to said source of alternating power and current regulator and regenerator phase control means connected to the output of said direct current circuit and supplying an input to said regenerator circuit.
Claim 10
Dependent Claim
58 words
An electronic drive system according to claim 1 wherein said polyphase frequency source comprises a plurality of frequency converting stages each having an output generator, a divider gate connected to the input of each output generator, means for controlling the dividing factor of the divider gate, and a variable frequency source connected to each of the divider gates.
Claim 11
Dependent Claim
41 words
An electronic drive system according to claim 5, wherein one of a plurality of ''''runup'''' speed controls is connected between each divider gate and the variable frequency oscillator so as to bring a particular driving means up to its operating speed.
Claim 12
Dependent Claim
77 words
An electronic drive system according to claim 1 wherein each of said rectifiers comprises a plurality of input leads and a pair of output leads, the alternating power source connected to the input leads, a first SCR connected between one of the input leads and one of the output leads, a second SCR connected between the one of the input leads and the other output lead and gate control means connected to the first and second SCR''s.
Claim 13
Dependent Claim
38 words
An electronic drive system according to claim 11 comprising a third SCR connected between a secOnd input lead and the one output lead, and a fourth SCR connected between the second input lead and the second output lead.
Claim 14
Dependent Claim
38 words
An electronic drive system according to claim 12 comprising a fifth SCR connected between a third input lead and the one output lead, and a sixth SCR connected between the third input lead and the second output lead.
Claim 15
Dependent Claim
23 words
An electronic drive system according to claim 13 wherein the gate control means is connected to the third, fourth, fifth and sixth SCR''s.
Claim 16
Dependent Claim
192 words
An electronic drive system according to claim 1 wherein each of said inverter bridges have a pair of input lines with one line connected to a source of direct current power and the other connected to an inverter commutation circuit, three output leads between which alternating polyphase voltages occur, first unilateral current means connected between the one input line and to each of the three output leads, second unilateral current means connected between the input of the inverter commutation circuit and to each of the three output leads, a first SCR connected between one of the input leads and one of the output leads, a second SCR connected between one of the input leads and a second of the output leads, a third SCR connected between one of the input leads and the third of the output leads, a fourth SCR connected between the second input lead and one of the output leads, a fifth SCR connected between the second input lead and the second output lead, a sixth SCR connected between the second input lead and the third output lead, and gate control means connected to the first through sixth SCR''s.
Claim 17
Dependent Claim
22 words
An electronic drive system according to claim 15 wherein one of the polyphase frequency sources is connected to the gate control means.
Claim 18
Dependent Claim
251 words
An electronic drive system for a multisection processing machine capable of maintaining a fixed ratio of speed between various sections of the machine and allowing simultaneous adjustment of the entire machine comprising: a plurality of driving means each connected to drive a different section of said machine; a source of three-phase alternating power; a plurality of rectifier circuits each connected to said source of alternating power whereby to convert the three-phase alternating power to direct current; a plurality of inverter bridges each providing outputs to said plurality of driving means and whereby the outputs vary in amplitude with frequency; a plurality of polyphase frequency sources for controlling the frequency and amplitude of the inputs to each driving means; a plurality of direct current regulators and phase control circuits each connected to one of said polyphase frequency sources and supplying an input to one of said rectifier circuits whereby the amplitude of said rectifier circuit varies as a function of the frequency of said one of said polyphase sources; the outputs of each of said rectifier circuits connected to one of said plurality of inverter bridges to produce an output with a frequency and amplitude suitable for driving one of said plurality of driving means; and a plurality of regenerator circuits connected to the outputs of one of said plurality of direct current circuits and with their outputs connected to the source of three-phase alternating power to supply regenerative power to the system when a particular driving means is producing regenerative power.
Claim 19
Dependent Claim
251 words
An electronic drive system for a multisection processing machine capable of maintaining a fixed ratio of speed between various sections of the machine and allowing simultaneous adjustment of the entire machine comprising: a plurality of driving means each connected to drive a different section of said machine; a source of three-phase alternating power; a plurality of rectifier circuits each connected to said source of alternating power whereby to convert the three-phase alternating power to direct current; a plurality of inverter bridges each providing outputs to said plurality of driving means and whereby the outputs vary in amplitude with frequency; a plurality of polyphase frequency sources for controlling the frequency and amplitude of the inputs to each driving means; a plurality of direct current regulators and phase control circuits each connected to one of said polyphase frequency sources and supplying an input to one of said rectifier circuits whereby the amplitude of said rectifier circuit varies as a function of the frequency of said one of said polyphase sources; the outputs of each of said rectifier circuits connected to one of said plurality of inverter bridges to produce an output with a frequency and amplitude suitable for driving one of said plurality of driving means; and a plurality of regenerator circuits connected to the outputs of one of said plurality of direct current circuits and with their outputs connected to the source of three-phase alternating power to supply regenerative power to the system when a particular driving means is producing regenerative power.
Claim 20
Dependent Claim
130 words
An electronic drive system according to claim 17 wherein said regenerator circuit converts direct current power to polyphase power and comprises a pair of input lines and three output lines; a first SCR connected between one input line and a first output line; a second SCR connected between one input line and a second output line, a third SCR connected between one input line and a third output line, a fourth SCR connected between the second input line and one output line, a fifth SCR connected between the second input line and a second output line, a sixth SCR connected betwEen the second input line and the third output line, and gate control means connected to the first through sixth SCR''s to convert the direct current power to polyphase power.
Claim 21
Dependent Claim
18 words
An electronic drive system according to claim 18 comprising phase control means connected to the gate control means.
Claim 22
Dependent Claim
74 words
An electronic drive system according to claim 1 wherein each of said plurality of inverter commutation circuits has a first input lead and a first output lead, an unilateral current device, and an electronic gate device connected in series between the first input and first output leads, a gate control connected to the electronic gate device, and a second opposite poled unilateral current device connected in parallel between the first input and output leads.
Claim 23
Dependent Claim
55 words
An electronic drive system according to claim 1 wherein each of said rectifier phase control circuits comprises: an electronic device; variable biasing means for the electronic device; and a control circuit connected in circuit with the variable biasing means and the electronic device to control the phase of the output signal of the electronic device.
Claim 24
Dependent Claim
106 words
An electronic drive system according to claim 11 wherein said gate control means comprises a pair of output terminals, an electronic gate device connected across the output terminals, a biasing circuit connected to the gate electrode of the electronic gate device, an input terminal, an alternating input signal supplied to the input terminal, means for converting the input signal to a plurality of pulses of the same polarity, a capacitor to which the plurality of pulses is applied, a multivibrator connected between the biasing circuit and the capacitor, and sensing means in circuit with the multivibrator to couple the signal on the capacitor to the multivibrator.
Claim 25
Dependent Claim
25 words
An electronic drive system according to claim 9 wherein said frequency converting stages comprise pulse chopping means which eliminate certain input pulses from the output.
Claim 26
Dependent Claim
67 words
An electronic drive system according to claim 23 wherein said pulse chopping means comprise: a fixed frequency oscillator; a counter connected to the output of the fixed frequency oscillator; an AND gate connected to the output of the fixed frequency oscillator; preset gates connected to the counter; a binary stage connected to the counter and the preset gates; and the binary stage connected to said AND gate.
Claim 27
Dependent Claim
42 words
An electronic drive system according to claim 10 wherein said ''''runup'''' speed control comprises: an AND gate connected to the variable frequency source; a flip-flop circuit with its output connected to the AND gate; and a multivibrator connected to said flip-flop circuit.
Claim 28
Dependent Claim
71 words
An electronic drive system according to claim 1 including a plurality of current regulators each connected to one of said plurality of direct current circuits, a plurality of regenerator phase control circuits connected to each of said current regulators and supplying an input to one of said regenerator circuits, whereby power produced by said driving means when in a regenerative condition is fed back to said source of three-phase alternating power.
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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) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |