GB1300556A - Improvements in cycloconverters - Google Patents

Improvements in cycloconverters

Info

Publication number
GB1300556A
GB1300556A GB07420/69A GB1742069A GB1300556A GB 1300556 A GB1300556 A GB 1300556A GB 07420/69 A GB07420/69 A GB 07420/69A GB 1742069 A GB1742069 A GB 1742069A GB 1300556 A GB1300556 A GB 1300556A
Authority
GB
United Kingdom
Prior art keywords
phase
thyristors
frequency
controlled rectifiers
polyphased
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
GB07420/69A
Inventor
John Edward Jenkins
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.)
Individual
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Priority to GB07420/69A priority Critical patent/GB1300556A/en
Priority to US22600A priority patent/US3636423A/en
Publication of GB1300556A publication Critical patent/GB1300556A/en
Expired legal-status Critical Current

Links

Classifications

    • 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)
  • Control Of Ac Motors In General (AREA)
  • Ac-Ac Conversion (AREA)

Abstract

1300556 Frequency conversion J E JENKINS 25 March 1970 [2 April 1969] 17420/69. Heading H2F In a cycloconverter for reducing the frequency supplied to a polyphased load from a polyphased supply 10, a plurality of bi-directional controlled rectifiers 21 ... 51 are connected in such a way that the only paths for substantial current from the supply are by way of the load, even if all the controlled rectifiers were to become conductive. As shown in Fig. 1, a variable speed induction motor has four windings R A ... B<SP>1</SP> D , bifilar of quadrifilarwound in each phase belt. The current from a two-phase, high frequency alternator 10 is arranged to flow in pulses lasting for one quarter of a cycle of alternator frequency by triggering thyristors 21 ... 51 at appropriate times under control of logic circuits (Figs. 5, 8, 9, not shown). The thyristors may be replaced by transistors or MOSTs. Each anti-parallel pair of thyristors may be replaced by a Triac. Fig. 7 shows an alternative arrangement for a star-connected three-phase induction motor R A ... B C supplied from a three-phase generator 70. Capacitors 162 ... 164 may be included to compensate for the winding leakage reactance. The logic circuits (Figs. 8, 9, not shown) may be responsive to the anode voltage of the controlled rectifiers so as to feed control signals to their gates only when the anode voltage is of correct polarity. The invention is also applicable to control of linear induction motors, or to the generation of travelling magnetic fields for heating and stirring molten metal.
GB07420/69A 1969-04-02 1969-04-02 Improvements in cycloconverters Expired GB1300556A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB07420/69A GB1300556A (en) 1969-04-02 1969-04-02 Improvements in cycloconverters
US22600A US3636423A (en) 1969-04-02 1970-03-25 Cycloconverter arrangements which prevent circulating currents

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB07420/69A GB1300556A (en) 1969-04-02 1969-04-02 Improvements in cycloconverters

Publications (1)

Publication Number Publication Date
GB1300556A true GB1300556A (en) 1972-12-20

Family

ID=10094899

Family Applications (1)

Application Number Title Priority Date Filing Date
GB07420/69A Expired GB1300556A (en) 1969-04-02 1969-04-02 Improvements in cycloconverters

Country Status (2)

Country Link
US (1) US3636423A (en)
GB (1) GB1300556A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2450891A (en) * 2007-07-10 2009-01-14 Cummins Generator Technologies Cycloconverter

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3702429A (en) * 1971-11-30 1972-11-07 Gen Motors Corp Cycloconverter silicon controlled rectifier gate-cathode circuit signal and power system
US3832624A (en) * 1973-09-06 1974-08-27 Allis Chalmers Group blanking control for cycloconverter
WO1987001529A1 (en) * 1985-08-26 1987-03-12 Gregory Peter Smith Modulation method and apparatus for static power frequency changers
US6528967B2 (en) * 2000-10-17 2003-03-04 Vscf, Inc. Permanent magnet brushless electric motor system and method of using same
US6719227B2 (en) * 2001-11-16 2004-04-13 General Electric Canada Inc. Grinding mill and methods for fabricating same
CA2411132A1 (en) * 2002-11-05 2004-05-05 Railpower Technologies Corp. Direct turbogenerator
US10676830B2 (en) * 2011-05-23 2020-06-09 Advanced Combustion Technologies, Inc. Combustible fuel and apparatus and process for creating the same
BR112013030156A2 (en) * 2011-05-23 2019-09-24 Advanced Combustion Tech Inc flammable fuel and apparatus and process to create the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2450891A (en) * 2007-07-10 2009-01-14 Cummins Generator Technologies Cycloconverter

Also Published As

Publication number Publication date
US3636423A (en) 1972-01-18

Similar Documents

Publication Publication Date Title
US3600668A (en) Time ratio solid state voltage regulator
USRE27040E (en) Adjustable frequency control system
GB1300556A (en) Improvements in cycloconverters
GB1466565A (en) 3-phase alternating current electric motors and generators
US3757179A (en) Voltage control of an ac drive system during motor starting
NO148877B (en) DEVICE FOR AA MOUNT TWO HODS WITH EACH OTHER
US3529224A (en) Speed control of induction motors with semiconductors and resistors
US2995696A (en) Alternating current generating system
US3579086A (en) Frequency conversion cycloconverter system for both single- and multi-phase applications
US3686558A (en) Control for frequency converters
US3617838A (en) Arrangement for stepless speed regulation of a motor fed with current from a converter
US3546550A (en) Control circuit for braking speed control of induction motor
US3732472A (en) Current supply and commutation circuit of electric motor
US3982170A (en) Variable speed, constant frequency induction generator system
US3059162A (en) Electric motor control system
GB1301253A (en)
US3781641A (en) Adjustable frequency power supply of the inverter type
GB1429880A (en) System for adjusting and commutating current in machine windings
US3313992A (en) Braking circuit
US2697198A (en) Electric contact converter
US2412442A (en) Regulator system
GB1226970A (en)
US3582737A (en) Speed control of a wye-connected induction motor utilizing delta connected triggerable biconductive devices
US3777250A (en) Filter for replacing notches in electric waves
US4413216A (en) Static frequency changer for feeding synchronous machines

Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLNP Patent lapsed through nonpayment of renewal fees