GB1192153A - Three-phase Frequency Changer Circuit - Google Patents

Three-phase Frequency Changer Circuit

Info

Publication number
GB1192153A
GB1192153A GB1131969A GB1131969A GB1192153A GB 1192153 A GB1192153 A GB 1192153A GB 1131969 A GB1131969 A GB 1131969A GB 1131969 A GB1131969 A GB 1131969A GB 1192153 A GB1192153 A GB 1192153A
Authority
GB
United Kingdom
Prior art keywords
pulses
motor
phase
pulse
circuit
Prior art date
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
GB1131969A
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.)
BBC Brown Boveri AG Switzerland
Original Assignee
Brown Boveri und Cie AG Switzerland
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.)
Filing date
Publication date
Priority claimed from CH325768A external-priority patent/CH486801A/en
Application filed by Brown Boveri und Cie AG Switzerland filed Critical Brown Boveri und Cie AG Switzerland
Publication of GB1192153A publication Critical patent/GB1192153A/en
Expired legal-status Critical Current

Links

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
    • 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
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M5/25—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means
    • H02M5/27—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means for conversion of frequency
    • H02M5/271—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a thyratron or thyristor type requiring extinguishing means for conversion of frequency from a three phase input voltage

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Ac-Ac Conversion (AREA)
  • Inverter Devices (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

1,192,153. Control of A.C. motors; static converters. BROWN, BOVERI & CO. Ltd. 3 March, 1969 [5 March, 1968], No. 11319/69. Addition to 1,170,203. Headings H2F and H2J. An A.C. motor 12 is supplied from a frequency-changing circuit comprising commutation groups A, B, each connected to a mains transformer 8 having primary windings 81, 82. The secondary windings of the transformer are divided into sets 83-85 and 86-88 connected to opposite ends of the phase windings of the motor in cyclic permutation. Each set has a diode circuit shunted by a thyristor 1-6 associated with a capacitor and a primary winding of a commutation transformer 10, 16. Each of these transformers has a secondary winding 21 connected across a clamping circuit. A train of pulses comprising two phase-displaced pulse sequences is used to control the thyristors of each commutation group, the repetition rate of the pulses in each of the sequences being the same and determining the frequency of the waveform applied to the motor. If the control and mains frequencies are equal the motor receives unidirectional voltage, the direction of rotation depending on which frequency is the greater. The magnitude of the motor voltage varies in accordance with the phase-displacement between the two pulse-sequences. The harmonic content is reduced when the motor is running in reverse by supplying the thyristors of each commutation group with a stream of pulses phase-displaced with that of the other group. Each stream comprises two phase-displaced trains each constituted by two phase-displaced pulse sequences. For each commutation group, a pulse generator 32 provides a pulse sequence of six times the control frequency, a divider 33 providing antiphase pulses of three times that frequency. One of the pulse shapers 34 is associated with a delay circuit 35, a train of pulses being fed from OR gate 36 to a ring-counter 37 which distributes the pulses to thyristors 28-30. For reverse running as described above, a circuit 38 contains duplicates of elements 28-35 and is associated with time delay device 39. The output pulses from circuit 38 are combined in OR gates 40 with the pulses from the counter 37. When the motor is operating forwardly, the effect of the second pulse train is removed by AND gates 41.
GB1131969A 1968-03-05 1969-03-03 Three-phase Frequency Changer Circuit Expired GB1192153A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH325768A CH486801A (en) 1967-04-25 1968-03-05 Three-phase converter system for supplying a three-phase motor

Publications (1)

Publication Number Publication Date
GB1192153A true GB1192153A (en) 1970-05-20

Family

ID=4252053

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1131969A Expired GB1192153A (en) 1968-03-05 1969-03-03 Three-phase Frequency Changer Circuit

Country Status (7)

Country Link
AT (1) AT283521B (en)
DE (1) DE1812045B2 (en)
FR (1) FR2003234A6 (en)
GB (1) GB1192153A (en)
NL (1) NL6903235A (en)
NO (1) NO121909B (en)
SE (1) SE359416B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4488216A (en) * 1983-04-29 1984-12-11 Westinghouse Electric Corp. Unrestricted frequency changer system and adjustable frequency AC motor drive using such a system
US4750098A (en) * 1987-09-02 1988-06-07 Westinghouse Electric Corp. Unrestricted frequency changer with current source output

Also Published As

Publication number Publication date
NL6903235A (en) 1969-09-09
NO121909B (en) 1971-04-26
FR2003234A6 (en) 1969-11-07
AT283521B (en) 1970-08-10
DE1812045A1 (en) 1970-05-27
SE359416B (en) 1973-08-27
DE1812045B2 (en) 1971-11-18

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees