GB1336481A - Method of magnetizing a permanent magnet assembly and a per manent magnet assembly when prepared by the method - Google Patents

Method of magnetizing a permanent magnet assembly and a per manent magnet assembly when prepared by the method

Info

Publication number
GB1336481A
GB1336481A GB5183871A GB5183871A GB1336481A GB 1336481 A GB1336481 A GB 1336481A GB 5183871 A GB5183871 A GB 5183871A GB 5183871 A GB5183871 A GB 5183871A GB 1336481 A GB1336481 A GB 1336481A
Authority
GB
United Kingdom
Prior art keywords
magnetizing
magnet assembly
permanent magnet
yoke
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
GB5183871A
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.)
Pioneer Corp
Original Assignee
Pioneer Electronic Corp
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 Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Publication of GB1336481A publication Critical patent/GB1336481A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F13/00—Apparatus or processes for magnetising or demagnetising
    • H01F13/003—Methods and devices for magnetising permanent magnets

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

1336481 Moving-coil transducers PIONEER ELECTRONIC CORP 8 Nov 1971 [9 Nov 1970] 51838/71 Heading H4J [Also in Division H1] In a method of magnetizing a pot-type magnetic circuit, e.g. for loud-speakers or microphones, comprising a retentive permanent magnet 4 surrounded by a non-retentive ferromagnetic yoke 3 for minimum magnetic leakage; due to residual magnetization of the yoke, the circuit is magnetized in a strong field between poles 2, Fig. 1, and then similarly magnetized in reverse direction by a field of lower intensity (Fig. 2, not shown) such as to demagnetize the yoke without substantially affecting the operating point of the permanent magnet; and as a result to increase the airgap flux. In the magnetizing circuit (Fig. 9, not shown) a coil exciting opposed poles is switchable to a D.C. source in alternate senses; first direct for initial magnetization and second through a series resistance for removal of the residual magnetism.
GB5183871A 1970-11-09 1971-11-08 Method of magnetizing a permanent magnet assembly and a per manent magnet assembly when prepared by the method Expired GB1336481A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9851470 1970-11-09

Publications (1)

Publication Number Publication Date
GB1336481A true GB1336481A (en) 1973-11-07

Family

ID=14221741

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5183871A Expired GB1336481A (en) 1970-11-09 1971-11-08 Method of magnetizing a permanent magnet assembly and a per manent magnet assembly when prepared by the method

Country Status (3)

Country Link
DE (1) DE2155005A1 (en)
FR (1) FR2113721A5 (en)
GB (1) GB1336481A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160165353A1 (en) * 2014-12-07 2016-06-09 Cardas Audio Ltd. Loudspeaker using Contour Field Hard Magnet Poles and Yoke Construction

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2534419C3 (en) * 1975-08-01 1980-01-17 Elmeg Elektro-Mechanik Gmbh, 3150 Peine Method for magnetizing and setting the operating point of a permanent magnet of a magnet system and device for carrying out the method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160165353A1 (en) * 2014-12-07 2016-06-09 Cardas Audio Ltd. Loudspeaker using Contour Field Hard Magnet Poles and Yoke Construction
US9699565B2 (en) * 2014-12-07 2017-07-04 Cardas Audio Ltd. Loudspeaker using contour field hard magnet poles and yoke construction
US20170265006A1 (en) * 2014-12-07 2017-09-14 Cardas Audio Ltd. Loudspeaker using Contour Field Hard Magnet Poles and Yoke Construction

Also Published As

Publication number Publication date
FR2113721A5 (en) 1972-06-23
DE2155005A1 (en) 1972-05-31

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Legal Events

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