GB1196061A - Improvements in or relating to the Operation of Electro-Magnetic Coils. - Google Patents

Improvements in or relating to the Operation of Electro-Magnetic Coils.

Info

Publication number
GB1196061A
GB1196061A GB704868A GB704868A GB1196061A GB 1196061 A GB1196061 A GB 1196061A GB 704868 A GB704868 A GB 704868A GB 704868 A GB704868 A GB 704868A GB 1196061 A GB1196061 A GB 1196061A
Authority
GB
United Kingdom
Prior art keywords
circuit
thyristor
generator
frequency
capacitor
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
GB704868A
Inventor
Jack Bowran
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.)
Davies and Metcalfe Ltd
Original Assignee
Davies and Metcalfe 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
Application filed by Davies and Metcalfe Ltd filed Critical Davies and Metcalfe Ltd
Priority to GB704868A priority Critical patent/GB1196061A/en
Publication of GB1196061A publication Critical patent/GB1196061A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

1,196,061. Control systems for inductive loads. DAVIES & METCALFE Ltd. 9 May, 1969 [13 Feb., 1968], No. 7048/68. Heading H2H. [Also in Division H3] A circuit for energizing an inductive load 5 comprises a capacitor 6 in shunt with the load so as to form a circuit having a natural resonant frequency of say, 1000 Hz, a thyristor 8 connected in series with the circuit 5, 6 across a supply P and a pulse generator 9 connected to the gate of the thyristor 8, the output frequency of the generator being variable between 50 and 1000 Hz. Each pulse from the generator 9 turns on the thyristor 8 which is then turned off by the resonant action of the circuit 5, 6, the duration of each conductive period being determined by the resonant frequency of the circuit 5, 6. Thus the average current flowing in the coil 5 is determined by the frequency of the pulses from the generator 9. The diode 10 prevents peak inverse voltages being developed across the thyristor and a capacitor 11 suppresses spurious operation of the thyristor. If desired the voltage across the circuit 5, 6, 8 may be stabilized by a Zener diode.
GB704868A 1968-02-13 1968-02-13 Improvements in or relating to the Operation of Electro-Magnetic Coils. Expired GB1196061A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB704868A GB1196061A (en) 1968-02-13 1968-02-13 Improvements in or relating to the Operation of Electro-Magnetic Coils.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB704868A GB1196061A (en) 1968-02-13 1968-02-13 Improvements in or relating to the Operation of Electro-Magnetic Coils.

Publications (1)

Publication Number Publication Date
GB1196061A true GB1196061A (en) 1970-06-24

Family

ID=9825644

Family Applications (1)

Application Number Title Priority Date Filing Date
GB704868A Expired GB1196061A (en) 1968-02-13 1968-02-13 Improvements in or relating to the Operation of Electro-Magnetic Coils.

Country Status (1)

Country Link
GB (1) GB1196061A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2140986A (en) * 1983-04-13 1984-12-05 Michael Shmuel Howard Switching of cyclic and general d.c. devices by a self-commutating- avalanche-device or interval-timer circuit
EP0287975A2 (en) * 1987-04-21 1988-10-26 Siemens Aktiengesellschaft Circuit arrangement with an electromagnetically controlled fault current switch device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2140986A (en) * 1983-04-13 1984-12-05 Michael Shmuel Howard Switching of cyclic and general d.c. devices by a self-commutating- avalanche-device or interval-timer circuit
EP0287975A2 (en) * 1987-04-21 1988-10-26 Siemens Aktiengesellschaft Circuit arrangement with an electromagnetically controlled fault current switch device
EP0287975A3 (en) * 1987-04-21 1990-06-13 Siemens Aktiengesellschaft Circuit arrangement with an electromagnetically controlled fault current switch device

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee