US3731242A - Method of forming plural strip-shaped magnetic poles - Google Patents
Method of forming plural strip-shaped magnetic poles Download PDFInfo
- 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
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)
- Hard Magnetic Materials (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL7012889A NL7012889A (fr) | 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 (fr) |
DE (1) | DE2141736B2 (fr) |
FR (1) | FR2106231A5 (fr) |
GB (1) | GB1347333A (fr) |
NL (1) | NL7012889A (fr) |
Cited By (3)
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 (fr) * | 2004-02-19 | 2005-09-29 | Rehau Ag + Co | Bande magnetique polymere a evidement et dispositif de magnetisation |
Families Citing this family (2)
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)
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 |
-
1970
- 1970-08-31 NL NL7012889A patent/NL7012889A/xx unknown
-
1971
- 1971-08-20 DE DE19712141736 patent/DE2141736B2/de active Granted
- 1971-08-23 US US00173904A patent/US3731242A/en not_active Expired - Lifetime
- 1971-08-27 GB GB4030471A patent/GB1347333A/en not_active Expired
- 1971-08-31 FR FR7131476A patent/FR2106231A5/fr not_active Expired
Patent Citations (4)
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)
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 (fr) * | 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 (fr) * | 2004-02-19 | 2005-09-29 | Rehau Ag + Co | Bande magnetique polymere a evidement et dispositif de magnetisation |
Also Published As
Publication number | Publication date |
---|---|
DE2141736B2 (de) | 1976-07-15 |
FR2106231A5 (fr) | 1972-04-28 |
DE2141736A1 (de) | 1972-03-09 |
GB1347333A (en) | 1974-02-27 |
NL7012889A (fr) | 1972-03-02 |
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