GB525605A - Improvements in or relating to electromagnets excited by alternating current - Google Patents

Improvements in or relating to electromagnets excited by alternating current

Info

Publication number
GB525605A
GB525605A GB20659/39A GB2065939A GB525605A GB 525605 A GB525605 A GB 525605A GB 20659/39 A GB20659/39 A GB 20659/39A GB 2065939 A GB2065939 A GB 2065939A GB 525605 A GB525605 A GB 525605A
Authority
GB
United Kingdom
Prior art keywords
core
shading
magnet
shading ring
july
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
GB20659/39A
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.)
Philips Lamps Ltd
Koninklijke Philips NV
Original Assignee
Philips Lamps Ltd
Philips Gloeilampenfabrieken NV
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 Philips Lamps Ltd, Philips Gloeilampenfabrieken NV filed Critical Philips Lamps Ltd
Publication of GB525605A publication Critical patent/GB525605A/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
    • H01F7/10—Electromagnets; Actuators including electromagnets with armatures specially adapted for alternating current
    • H01F7/12—Electromagnets; Actuators including electromagnets with armatures specially adapted for alternating current having anti-chattering arrangements
    • H01F7/1205—Electromagnets; Actuators including electromagnets with armatures specially adapted for alternating current having anti-chattering arrangements having short-circuited conductors

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Braking Arrangements (AREA)
  • Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)

Abstract

525,605. Electrically-operated brakes. PHILIPS LAMPS, Ltd. July 15, 1939, No. 20659. Convention date, July 18, 1938. [Class 103 (i)] [Also in Groups XXXV and XL] The core of an electromagnet provided with an armature attracted by both ends of the magnet and a shading ring encircling a portion of one pole is divided into two or more portions so that the flux corresponding to the portion of the pole enclosed by the shading ring is kept separate from the remainder of the flux. Figs. 5 and 6 show the application of the invention to a radio tuning-device. The laminated core of the magnet consists of two parts 7 and 8 separated by a member 9 of non-magnetic material. The separation is continued by the shading ring 4. The armature of the magnet consists of a disc 13 rotated by the setting-knob 12. When the set is in tune with the desired wavelength a current passes through the coil 3 and attracts the disc 13, thus braking the setting-mechanism. The application of the invention to a brake for a gramophone is also described. The core may be divided into three portions, the middle one of which carries the shading-ring.
GB20659/39A 1938-07-18 1939-07-15 Improvements in or relating to electromagnets excited by alternating current Expired GB525605A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE525605X 1938-07-18

Publications (1)

Publication Number Publication Date
GB525605A true GB525605A (en) 1940-08-30

Family

ID=6552670

Family Applications (1)

Application Number Title Priority Date Filing Date
GB20659/39A Expired GB525605A (en) 1938-07-18 1939-07-15 Improvements in or relating to electromagnets excited by alternating current

Country Status (1)

Country Link
GB (1) GB525605A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2546740A (en) * 1949-07-26 1951-03-27 Gen Electric Alternating-current electromagnet with armature

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2546740A (en) * 1949-07-26 1951-03-27 Gen Electric Alternating-current electromagnet with armature

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