GB694756A - Improvements in and relating to voltage regulators - Google Patents

Improvements in and relating to voltage regulators

Info

Publication number
GB694756A
GB694756A GB918051A GB918051A GB694756A GB 694756 A GB694756 A GB 694756A GB 918051 A GB918051 A GB 918051A GB 918051 A GB918051 A GB 918051A GB 694756 A GB694756 A GB 694756A
Authority
GB
United Kingdom
Prior art keywords
cores
winding
core
permanent magnet
flux
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
GB918051A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co Ltd
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 to US694756XA priority Critical
Application filed by British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB694756A publication Critical patent/GB694756A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/14Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
    • H02P9/32Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field using magnetic devices with controllable degree of saturation

Abstract

694,756. Automatic voltage control systems; inductances. BRITISH THOMSON-HOUSTON CO., Ltd. April 19, 1951 [May 2, 1950], No. 9180/51. Classes 38 (ii) and 38 (iv). [Also in Group XXXIX] The output voltage of an alternator is controlled by supplying its field from the A.C. output via a rectifier and saturable reactor, the reactor being controlled by a mag. netic amplifier having a permanent magnet as a reference m.m.f. The voltage of the alternator 1 is detected by connecting a resistor 24 and condenser 25 in series across the output to provide a frequency compensated voltage divider, the voltage across the condenser being rectified at 26 and applied to control windings 22, 23 of the amplifier 6 (and also to a biasing winding 38 on reactor 31). The output of amplifier 6 controls the excitation of winding 37 to vary the saturation of reactor 31, thereby controlling the magnitude of the current that flows (in alternate half-cycles) through load coils 32, 33 and rectifiers 34, to the field winding 4. Amplifier 6 consists of a permanent magnet 12 (surrounded by a shorted turn 41 to reduce the effects of a pulsating flux due to the current in the load windings) the magnet being shunted by laminated core members 9, 10, 11, 13, including air gaps 16, 17, and also shunted by two cores 14, 15 of relatively small cross-section, and made of a magnetic material having a very sharp knee in its magnetization characteristic. The flux of the permanent magnet would saturate the cores 14, 15, were it not for an opposing flux due to control windings 22, 23 wound on the cores 14, 15. Load windings 19, 20 are wound on cores 14, 15 respectively (under the windings 22, 23) and, on alternate half-cycles, pass current from a transformer 5 through winding 37 via rectifiers 21. The pulsating flux in core 14 or 15 due to the unidirectional current pulse through winding 19 or 20 aids the flux due to the permanent magnet. Hence at some point on the pulse waveform the total flux causes the core to saturate, the reactance of the winding falls sharply and current is passed to the winding 37. The point at which the core saturates is determined by the control current in windings 22, 23 which controls the degree of magnetization of the cores. In a modification, Fig. 2, the axis of the permanent magnet 12 is parallel to the cores 14, 15, and the main portion of the core comprises upper and lower members 42, 43. A magnetic shunt 44 is inserted between members 42 and 43 and airgaps are included in this path. In a further modification, Fig. 3 (not shown), the core is made symmetrical by placing the cores 14, 15 on opposite sides of the core which contains the permanent magnet. Specification 670,838 is referred to.
GB918051A 1950-05-02 1951-04-19 Improvements in and relating to voltage regulators Expired GB694756A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US694756XA true 1950-05-02 1950-05-02

Publications (1)

Publication Number Publication Date
GB694756A true GB694756A (en) 1953-07-29

Family

ID=22089224

Family Applications (1)

Application Number Title Priority Date Filing Date
GB918051A Expired GB694756A (en) 1950-05-02 1951-04-19 Improvements in and relating to voltage regulators

Country Status (1)

Country Link
GB (1) GB694756A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1166339B (en) * 1957-01-29 1964-03-26 Stone J & Co Ltd Electric battery charging and power supply devices, in particular for railway vehicles
EP2001028A1 (en) * 2007-06-08 2008-12-10 ABB Oy Protection of permanent magnets in a DC-inductor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1166339B (en) * 1957-01-29 1964-03-26 Stone J & Co Ltd Electric battery charging and power supply devices, in particular for railway vehicles
EP2001028A1 (en) * 2007-06-08 2008-12-10 ABB Oy Protection of permanent magnets in a DC-inductor
US8035470B2 (en) 2007-06-08 2011-10-11 Abb Oy Protection of permanent magnets in a DC-inductor

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