US3731242A - Method of forming plural strip-shaped magnetic poles - Google Patents

Method of forming plural strip-shaped magnetic poles Download PDF

Info

Publication number
US3731242A
US3731242A US00173904A US3731242DA US3731242A US 3731242 A US3731242 A US 3731242A US 00173904 A US00173904 A US 00173904A US 3731242D A US3731242D A US 3731242DA US 3731242 A US3731242 A US 3731242A
Authority
US
United States
Prior art keywords
conductor
strips
soft
magnetic
magnet
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 - Lifetime
Application number
US00173904A
Other languages
English (en)
Inventor
W Hofman
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.)
US Philips Corp
Original Assignee
US Philips 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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3731242A publication Critical patent/US3731242A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • 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

Definitions

  • the present invention relates to a method of forming a plurality of strip-shaped magnetic poles of alternating polarities on the surface of a permanent magnet to be magnetized, which surface is placed near a conductor, after which an electric current is passed through the conductor.
  • the electric conductor comprises a plurality of parallel tortuous paths which are embedded in a synthetic resin.
  • the effect is based on the presence of a magnetic field around this conductor.
  • the magnet body which is to be magnetized is placed on the conductor and is polarized under the influence of this magnetic field.
  • the invention is characterized in that a plurality of strips of a soft -magnetic material are arranged parallel to one another in the direction of current flow and are interposed between the surface of the magnet and the surface of the conductor.
  • the conductors may have various shapes.
  • a flat strip-shaped conductor may be used on one surface of which identical strips of soft-iron may be arranged across its full width.
  • the conductor may be cylindrical, the soft-iron strips being arranged internally or externally along the entire circumference.
  • the advantage of this method is that the length of the current-carrying conductor is kept to a minimum, i.e., the conductor has a low electrical resistance. This is an important feature in view of the large values of the current pulses required to magnetize the magnet body (from 40 to 50 RA). The resulting accuracy of the polarization is high and the method may be carried out in a simple manner.
  • a device for carrying out the method which comprises a conductor through which an electric current may be passed according to the invention is characterized in that the conductor is provided with strips of a soft magnetic material which are arranged parallel to one another in the direction of current flow.
  • the invention also relates to a permanent magnet produced by the method.
  • the permanent magnet preferably consists of a yielding synthetic material in which a permanent-magnetic powder is embedded.
  • FIGS. 1 and 2 show a device for carrying out the method according to the invention
  • FIG. 3 shows a detail of the magnetization
  • FIGS. 4 and 5 illustrate a cylindrical magnetizing device according to the invention.
  • the device shown comprises a flat copper electric conductor 1 on which a plurality of soft-iron strips 2 have been arranged parallel to one another.
  • the magnetization of flat permanent magnets is effected as follows:
  • An object 3 to be magnetized for example, a plastoferrite strip, is placed on or over the strips 2.
  • the current flows in a direction at right angles to the plane of the drawing and recedes from the reader.
  • the current produces a magnetic field H, the direction of which is indicated by an arrow in the Figures.
  • the softiron strips are magnetized by this magnetic field and have poles disposed as shown in FIG. 3.
  • the field within the object 3 to be magnetized is indicated by broken arrows and produces magnetic poles at the boundaries of the strips 2.
  • a cylindrical conductor 1 also may be used.
  • the strips 2 are arranged on the outer surface, and in FIG. 5 on the inner surface, of this conductor.
  • a method of magnetizing a permanent magnet to form a plurality of strip-shaped magnetic poles of alternating polarities on the surface of said permanent magnet which comprises, placing said magnet surface near an electric conductor, arranging a plurality of strips of a soft-magnetic material in parallel with one another between the surface of the magnet and the surface of the conductor, and passing an electric current through the conductor in a direction parallel to the magnetic strips.
  • a method of magnetizing a magnetizable body to form a permanent magnet with a plurality of stripshaped magnetic poles of alternating polarity on the surface thereof which comprises, arranging a plurality of strips of a soft-magnetic material in a parallel between the surface of an electric conductor and the surface of the magnet, and passing an electric current through the conductor in a direction parallel to the magnetic strips.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Hard Magnetic Materials (AREA)
US00173904A 1970-08-31 1971-08-23 Method of forming plural strip-shaped magnetic poles Expired - Lifetime US3731242A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7012889A NL7012889A (de) 1970-08-31 1970-08-31

Publications (1)

Publication Number Publication Date
US3731242A true US3731242A (en) 1973-05-01

Family

ID=19810914

Family Applications (1)

Application Number Title Priority Date Filing Date
US00173904A Expired - Lifetime US3731242A (en) 1970-08-31 1971-08-23 Method of forming plural strip-shaped magnetic poles

Country Status (5)

Country Link
US (1) US3731242A (de)
DE (1) DE2141736B2 (de)
FR (1) FR2106231A5 (de)
GB (1) GB1347333A (de)
NL (1) NL7012889A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60107809A (ja) * 1983-11-17 1985-06-13 Denka Seiyaku Kk 牛に嚥下させる多極磁石の製造方法及び装置
US5734216A (en) * 1994-11-29 1998-03-31 Nissan Motor Co. Ltd. Magnet rotor for synchronous motor
WO2005091314A1 (de) * 2004-02-19 2005-09-29 Rehau Ag + Co Polymeres magnetband mit aussparung und vorrichtung zur magnetisierung

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8002303A (nl) * 1980-04-21 1981-11-16 Philips Nv Werkwijzen voor het vervaardigen van een kleurenbeeldbuis voorzien van een magnetisch quadrupool nafocusseringsmasker en inrichtingen voor het uitvoeren van de werkwijzen.
CN110277217B (zh) * 2019-06-11 2021-03-09 温州任和文化创意有限责任公司 一种磁性胶条充磁板的制作方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3158797A (en) * 1961-10-31 1964-11-24 Stackpole Carbon Co Device for magnetizing circular magnets
US3191106A (en) * 1959-12-24 1965-06-22 Baermann Max Rubber-like permanent magnet article and manufacture of same
US3335377A (en) * 1964-04-20 1967-08-08 Kohlhagen Walter Method and apparatus for magnetizing permanent-magnet rotors for synchronous reaction motors
US3474368A (en) * 1967-08-01 1969-10-21 R F L Ind Inc Magnet charging fixture

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3191106A (en) * 1959-12-24 1965-06-22 Baermann Max Rubber-like permanent magnet article and manufacture of same
US3158797A (en) * 1961-10-31 1964-11-24 Stackpole Carbon Co Device for magnetizing circular magnets
US3335377A (en) * 1964-04-20 1967-08-08 Kohlhagen Walter Method and apparatus for magnetizing permanent-magnet rotors for synchronous reaction motors
US3474368A (en) * 1967-08-01 1969-10-21 R F L Ind Inc Magnet charging fixture

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60107809A (ja) * 1983-11-17 1985-06-13 Denka Seiyaku Kk 牛に嚥下させる多極磁石の製造方法及び装置
JPH0221648B2 (de) * 1983-11-17 1990-05-15 Denka Pharma
US5734216A (en) * 1994-11-29 1998-03-31 Nissan Motor Co. Ltd. Magnet rotor for synchronous motor
WO2005091314A1 (de) * 2004-02-19 2005-09-29 Rehau Ag + Co Polymeres magnetband mit aussparung und vorrichtung zur magnetisierung

Also Published As

Publication number Publication date
DE2141736B2 (de) 1976-07-15
FR2106231A5 (de) 1972-04-28
GB1347333A (en) 1974-02-27
DE2141736A1 (de) 1972-03-09
NL7012889A (de) 1972-03-02

Similar Documents

Publication Publication Date Title
GB1182313A (en) An Electromagnetic Operating Device
GB927545A (en) Improvements in magnet systems
CN1052213A (zh) 在可磁化体上形成磁化区域的方法及装置
GB1076907A (en) Energisation of superconductive coils
US4015174A (en) Devices for magnetic control with permanent magnets
GB1263386A (en) Improvements in or relating to a motor device whose magnetic circuit comprises a thin layer of hard magnetic material
US4309628A (en) Pulse generation by changing magnetic field
US3731242A (en) Method of forming plural strip-shaped magnetic poles
US3041483A (en) Electromagnetic measuring coil
GB1360606A (en) Magnetic systems
EP0026014B1 (de) Verfahren zur Herstellung einer in einen Luftspalt eines Transformatorkerns einzubauende Permanentmagnetanordnung
GB953106A (en) Improvements in or relating to visual indicating devices
US3075059A (en) Switching device
US3317872A (en) Annular two-pole permanent magnets for direct-current motors having the free-pole armatures
US3303371A (en) Axial air-gap electrical machine
US4529954A (en) Magnetizing apparatus for anisotropic permanent magnets
US3602906A (en) Multiple pulse magnetic memory units
FR2267649A1 (en) Permanent magnet electric machines - has pole pieces with parts having different remanence and coercive fields
SE328938B (de)
GB894184A (en) An electrical contact device
JPS6153843B2 (de)
KR840002411B1 (ko) 스트립형 재료의 다극자화 장치
SU773752A1 (ru) Устройство дл намагничивани многополюсных магнитов электрических машин
US3366811A (en) Direct current motor having a threepole armature and an annular twopole magnet
SU1170516A1 (ru) Устройство дл импульсного намагничивани дисковых ферродиэлектрических анизотропных магнитов