GB1064591A

GB1064591A – Variable frequency power supplies
– Google Patents

GB1064591A – Variable frequency power supplies
– Google Patents
Variable frequency power supplies

Info

Publication number
GB1064591A

GB1064591A
GB4023364A
GB4023364A
GB1064591A
GB 1064591 A
GB1064591 A
GB 1064591A
GB 4023364 A
GB4023364 A
GB 4023364A
GB 4023364 A
GB4023364 A
GB 4023364A
GB 1064591 A
GB1064591 A
GB 1064591A
Authority
GB
United Kingdom
Prior art keywords
pulse
frequency
divider
circuits
stable
Prior art date
1963-10-22
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)

Expired

Application number
GB4023364A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

AMF Inc

Original Assignee
AMF Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1963-10-22
Filing date
1964-10-02
Publication date
1967-04-05

1964-10-02
Application filed by AMF Inc
filed
Critical
AMF Inc

1967-04-05
Publication of GB1064591A
publication
Critical
patent/GB1064591A/en

Status
Expired
legal-status
Critical
Current

Links

Espacenet

Global Dossier

Discuss

Classifications

H—ELECTRICITY

H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER

H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS

H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage

H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage

H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters

G—PHYSICS

G06—COMPUTING; CALCULATING OR COUNTING

G06F—ELECTRIC DIGITAL DATA PROCESSING

G06F7/00—Methods or arrangements for processing data by operating upon the order or content of the data handled

G06F7/60—Methods or arrangements for performing computations using a digital non-denominational number representation, i.e. number representation without radix; Computing devices using combinations of denominational and non-denominational quantity representations, e.g. using difunction pulse trains, STEELE computers, phase computers

G06F7/68—Methods or arrangements for performing computations using a digital non-denominational number representation, i.e. number representation without radix; Computing devices using combinations of denominational and non-denominational quantity representations, e.g. using difunction pulse trains, STEELE computers, phase computers using pulse rate multipliers or dividers pulse rate multipliers or dividers per se

H—ELECTRICITY

H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER

H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF

H02M1/00—Details of apparatus for conversion

H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters

H02M1/084—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters using a control circuit common to several phases of a multi-phase system

H02M1/0845—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters using a control circuit common to several phases of a multi-phase system digitally controlled (or with digital control)

H—ELECTRICITY

H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER

H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS

H02P2201/00—Indexing scheme relating to controlling arrangements characterised by the converter used

H02P2201/03—AC-DC converter stage controlled to provide a defined DC link voltage

H—ELECTRICITY

H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER

H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS

H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage

H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage

H02P27/047—V/F converter, wherein the voltage is controlled proportionally with the frequency

Abstract

1,064,591. Pulse generators. AMERICAN MACHINE & FOUNDRY CO. Oct. 2, 1964 [Oct. 22, 1963], No. 40233/64. Heading H3T. [Also in Divisions G3 and H2] A variable-frequency pulse generator for controlling the frequency of A.C. power to a load comprises a fixed oscillator connected to a chain of frequency-dividers which give pulse trains such that no pulse in any one train coincides with a pulse in any other chain, and means connected to the frequency-dividers to provide a single pulse train corresponding in time to at least one of the pulse trains from the frequency-dividers. Fig. 1 (not shown) utilizes such a pulse generator applied to the speed control of an A.C. motor, e.g. for driving the take-up reel of an extruded thread where the tangential thread velocity is to remain constant regardless of the reel diameter. An oscillator provides square waves at 100 kc/s. and a frequency-divider chain (14) gives outputs at ¢, , #, 1/ 16 , 1/ 32 and 1/ 64 of 100 kc/s. Selected ones (or all) of these outputs are added together to give a resultant pulse train which is further divided by 64 in divider (15) and used to operate the motor (12). The particular outputs of the divider (14) that are used are controlled by the state of a binary counter (26), which is set up initially by a punched card reader (20) with switches (27, 28) open. The motor then starts and runs up to a definite speed. Switches (27, 28) are now closed, and a second card-reader (18) controls a slope generator (17) to alter the count in (26) according to a predetermined programme. The slope generator receives pulses from the divider chain (14) and the signals from the card reader (18) determine which of these shall affect the counter (26), which in turn controls the frequency of the pulses fed to divider (15). When the state of the counter (26) reaches a predetermined figure, a wordrecognizer (21) senses equality between this count and a figure obtained from a third cardreader (19) and stops the output from the divider chain (14). The frequency of the pulses from (14) changes incrementally but the changes are small and effectively produce a linear change of frequency applied to the motor. The rate of change can be altered in magnitude and/or sign according to instructions from the card-readers (18 and 19). The pulses from the divider (15) are at 6 times the operating frequency of the motor and control a 3-phase converter (16) which in turn controls a power inverter (11). Since the inductive reactance of the motor windings varies with frequency, the actual A.C. voltage across the motor is sensed in a unit (22) and compared with a signal representing the frequency of the input pulses to the inverter (11). Any difference controls a rectifier (10) to vary the D.C. input to the inverter (11). Divider chain (14) and counter (26) (Fig. 3).- The output from the oscillator 13 is applied to a chain of bi-stable circuits 30-36 each of which divides the frequency by 2; the leading edge of a pulse from each stage coincides with the trailing edge of a pulse from the preceding stage. Each stage feeds a monostable circuit 40-46 which provides a short pulse coinciding with the leading edge of the corresponding pulse from the divider stage. The outputs of the monostable circuits pass through AND gates 50-56 to an OR gate 57 which produces a pulse train as input to the divider 15. This pulse train contains pulses from one or more of the divider stages 30-36 depending on which of the AND gates 50-56 are open. The AND gates are controlled by cascaded bi-stable circuits 60-66, the first of which (66) is operated by a signal from the slope generator 17. Each bi-stable circuit can also be changed over by a signal from the card reader 20 to establish the initial output frequency. If the frequency is to be increased during operation, the counter should be capable of counting in the opposite direction (60 towards 66). The output connections from divider stages 30-36 are shown as being taken from the » 1 » terminal. If the successive divider stages and the monostable circuits 40-46 are responsive to the same polarity of voltage change the two circuits should be fed from different output terminals to ensure that no pulse from any one of the mono-stable circuits can coincide with any pulse from the other mono-stable circuits. Slope generator (17, Fig. 4, not shown).- This is basically the same as the divider chain (14) without the binary counter. A chain of bi-stable circuits (70-79) divides the output of the divider chain further, and selected ones of these stages are passed to the output via monostable circuits (80-89), AND gates (90-99) and OR gate (101). The AND gates are controlled by signals from the card-reader (18). The output of the last bi-stable stage (79) consists of one pulse per 300 seconds. Motor control circuits (Fig. 5, not shown).- The pulses from the divider chain (14) are further divided in frequency in bi-stable circuits (110-115) and operate a mono-stable circuit (116). The pulses then pass through AND gates (117-122) to bi-stable circuits (123-125) which control the power inverters (144-146) for the 3-phase motor (12). The outputs of the bi-stable circuits (123-125) are also connected to AND gates (126-131) in the manner shown; these control the second inputs of AND gates (117-122) to energize the bistable circuits (123-125) in the correct sequence. Delay circuits (132-137) prevent a pulse from the mono-stable circuit (116) from effecting two changes in the bi-stable circuits (123-125). Each power inverter (144-146) contains four relay devices arranged so that in one state of the bi-stable circuit (123-125) one pair of relay devices sends current through the motor in one direction and in the other state the other pair sends current in the opposite direction. These inverters work in sequence for the three phase windings of the motor. The pulses from the bi-stable circuit (123) drive a transformer (138) into saturation and apply a pulse to an integrator (140) each time the bi-stable circuit changes to the » 1 » state. A D.C. voltage is thus passed to the regulator (10) which represents the frequency of the pulses. The A.C. voltage across the motor is sensed by circuit (147-151) to give a corresponding D.C. voltage to the regulator (10). These two voltages are compared and any difference controls the D.C. energization of the inverters to maintain the torque constant as the operating frequency varies.

GB4023364A
1963-10-22
1964-10-02
Variable frequency power supplies

Expired

GB1064591A
(en)

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

US31804963

US3317805A
(en)

1963-10-22
1963-10-22
Variable frequency power supplies for electric motor

Publications (1)

Publication Number
Publication Date

GB1064591A
true

GB1064591A
(en)

1967-04-05

Family
ID=23236407
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB4023364A
Expired

GB1064591A
(en)

1963-10-22
1964-10-02
Variable frequency power supplies

Country Status (3)

Country
Link

US
(1)

US3317805A
(en)

DE
(1)

DE1488105A1
(en)

GB
(1)

GB1064591A
(en)

Cited By (1)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

FR2420251A1
(en)

*

1978-03-14
1979-10-12
Westinghouse Electric Corp

DIGITAL PULSE GENERATOR WITH CONTROL AND STOP DETECTION

Families Citing this family (8)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US3408547A
(en)

*

1965-10-01
1968-10-29
Xerox Corp
Synchronizing system for synchronous motor utilizing a frequency divider

US3439242A
(en)

*

1966-04-08
1969-04-15
Borg Warner
Plural motor control system with frequency sensors for determining when predetermined motor speed is attained

US3437900A
(en)

*

1967-02-13
1969-04-08
U M C Ind Inc
Static control system for alternating current motor employing analog to digital converter

US3529223A
(en)

*

1967-10-04
1970-09-15
Texas Instruments Inc
Variable speed induction motor controller with rotor frequency sensing

US3577052A
(en)

*

1968-10-17
1971-05-04
David Elvis Bauer
Ac motor control system with synchronous speed change

US3809976A
(en)

*

1969-06-04
1974-05-07
H Et J J Bessire Sa
Method and apparatus for synchronizing a three phase motor

US3710218A
(en)

*

1970-10-08
1973-01-09
Micro Magnetic Ind Inc
Induction motor speed control

US4857819A
(en)

*

1981-10-01
1989-08-15
Emerson Electric Co.
Connection of static inverter to a running motor

Family Cites Families (5)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

BE524802A
(en)

*

1952-12-04
1900-01-01

US2953735A
(en)

*

1958-06-30
1960-09-20
Borg Warner
Polyphase static inverter

US3052833A
(en)

*

1959-02-24
1962-09-04
Borg Warner
Polyphase static inverter

US3184663A
(en)

*

1960-07-25
1965-05-18
Warner Swasey Co
Plural pulse responsive motor synchronizing control system with uniform pulse spacing

US3212010A
(en)

*

1963-02-25
1965-10-12
Gen Motors Corp
Increasing frequency pulse generator for indicating predetermined time intervals by the number of output pulses

1963

1963-10-22
US
US31804963
patent/US3317805A/en
not_active
Expired – Lifetime

1964

1964-10-02
GB
GB4023364A
patent/GB1064591A/en
not_active
Expired

1964-10-20
DE
DE19641488105
patent/DE1488105A1/en
active
Pending

Cited By (1)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

FR2420251A1
(en)

*

1978-03-14
1979-10-12
Westinghouse Electric Corp

DIGITAL PULSE GENERATOR WITH CONTROL AND STOP DETECTION

Also Published As

Publication number
Publication date

US3317805A
(en)

1967-05-02

DE1488105A1
(en)

1968-12-12

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