JPS57199205A - Cylindrical permanent magnet and manufacture thereof - Google Patents

Cylindrical permanent magnet and manufacture thereof

Info

Publication number
JPS57199205A
JPS57199205A JP56084431A JP8443181A JPS57199205A JP S57199205 A JPS57199205 A JP S57199205A JP 56084431 A JP56084431 A JP 56084431A JP 8443181 A JP8443181 A JP 8443181A JP S57199205 A JPS57199205 A JP S57199205A
Authority
JP
Japan
Prior art keywords
magnet
poles
denotes
cylindrical part
magnetized
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.)
Granted
Application number
JP56084431A
Other languages
Japanese (ja)
Other versions
JPH0340487B2 (en
Inventor
Motoharu Shimizu
Tokuyuki Noda
Yoshihiro Noguchi
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.)
Proterial Ltd
Original Assignee
Hitachi Metals 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 Hitachi Metals Ltd filed Critical Hitachi Metals Ltd
Priority to JP56084431A priority Critical patent/JPS57199205A/en
Publication of JPS57199205A publication Critical patent/JPS57199205A/en
Publication of JPH0340487B2 publication Critical patent/JPH0340487B2/ja
Granted 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
    • H01F7/02—Permanent magnets [PM]
    • H01F7/0205—Magnetic circuits with PM in general
    • H01F7/021—Construction of PM

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Hard Magnetic Materials (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

PURPOSE:To increase surface magnetic flux density and obtain a low inertial force by a method wherein surface multipole anisotropy having eight poles or more is given to the cylindrical part of a magnet body and the ratio between the inside and outside diameters of the cylindrical part is set to be 1-Kpi/P, and K>=1.5, where P denotes the number of magnetized poles. CONSTITUTION:A sintered cylindrical permanent magnet has a magnet-plumbite type crystal structure of MO.nFe2O3 (M denotes Ba, Sr, Pb and n denotes 5-6). In this structure, surface multipole anisotropy having eight poles or more is given to the cylindrical part of the magnet. The ratio between the inside diameter D1 and the outside diameter D2 is set to be D1/D2=1-Kpi/P and K>=1.5, where P is the number of magnetized poles. As the result, a multipole magnetized-surface magnet having high surface magnetic flux density is obtained. In addition, an optimum size of the inside and outside diameters maintaining magnetic characteristics is obtained.
JP56084431A 1981-06-03 1981-06-03 Cylindrical permanent magnet and manufacture thereof Granted JPS57199205A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56084431A JPS57199205A (en) 1981-06-03 1981-06-03 Cylindrical permanent magnet and manufacture thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56084431A JPS57199205A (en) 1981-06-03 1981-06-03 Cylindrical permanent magnet and manufacture thereof

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP6809188A Division JPH01144354A (en) 1988-03-24 1988-03-24 Rotor for stepping motor

Publications (2)

Publication Number Publication Date
JPS57199205A true JPS57199205A (en) 1982-12-07
JPH0340487B2 JPH0340487B2 (en) 1991-06-19

Family

ID=13830390

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56084431A Granted JPS57199205A (en) 1981-06-03 1981-06-03 Cylindrical permanent magnet and manufacture thereof

Country Status (1)

Country Link
JP (1) JPS57199205A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59224103A (en) * 1983-06-03 1984-12-17 Tohoku Metal Ind Ltd Cylindrical permanent magnet
JPS60108184U (en) * 1983-12-24 1985-07-23 ティーディーケイ株式会社 cylindrical ferrite magnet
US4600555A (en) * 1983-05-20 1986-07-15 Hitachi Metals, Ltd. Method of producing a cylindrical permanent magnet
WO1986006207A1 (en) * 1985-04-12 1986-10-23 Kanegafuchi Kagaku Kogyo Kabushiki Kaisha Multipolar magnet
JPS6377361A (en) * 1986-09-19 1988-04-07 Hitachi Ltd Permanent magnet type rotor
JPH01144354A (en) * 1988-03-24 1989-06-06 Hitachi Metals Ltd Rotor for stepping motor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53143008U (en) * 1977-04-18 1978-11-11

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53143008U (en) * 1977-04-18 1978-11-11

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4600555A (en) * 1983-05-20 1986-07-15 Hitachi Metals, Ltd. Method of producing a cylindrical permanent magnet
JPS59224103A (en) * 1983-06-03 1984-12-17 Tohoku Metal Ind Ltd Cylindrical permanent magnet
JPS635886B2 (en) * 1983-06-03 1988-02-05 Tohoku Metal Ind Ltd
JPS60108184U (en) * 1983-12-24 1985-07-23 ティーディーケイ株式会社 cylindrical ferrite magnet
WO1986006207A1 (en) * 1985-04-12 1986-10-23 Kanegafuchi Kagaku Kogyo Kabushiki Kaisha Multipolar magnet
JPS6377361A (en) * 1986-09-19 1988-04-07 Hitachi Ltd Permanent magnet type rotor
JPH01144354A (en) * 1988-03-24 1989-06-06 Hitachi Metals Ltd Rotor for stepping motor

Also Published As

Publication number Publication date
JPH0340487B2 (en) 1991-06-19

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