Title:
PERMANENT MAGNET ROTOR PRODUCTION METHOD
Document Type and Number:
Japanese Patent JP2021083288
Kind Code:
A
Abstract:
To provide a permanent magnet rotor production method which can achieve the perfect magnetization by an effective magnetic field that a common magnetization device can generate in a permanent magnet rotor as to a fine crystal grain neodymium permanent magnet which needs an extremely high effective magnetic field.SOLUTION: A permanent magnet rotor production method is arranged to heat a permanent magnet rotor having a rotation shaft at a center of an iron core, and including a pre-magnetization magnet in the iron core, followed by magnetization. The pre-magnetization magnet is a neodymium magnet including fine crystal grains of 0.1-3.5 μm in average crystal grain diameter. The permanent magnet rotor production method comprises: a heating step of heating the permanent magnet rotor in a range of a particular temperature (Ta°C) capable of achieving perfect magnetization or above, and a particular temperature (Tb°C) capable of causing irreversible demagnetization or below to obtain a post-heating permanent magnet; and a magnetization step of magnetizing the post-heating permanent magnet to a magnetization rate of 98% or higher.SELECTED DRAWING: Figure 1
Inventors:
MIZOGUCHI TETSUHIKO
HINATA JUMPEI
SAITO NARIYASU
HANADA KAZUNARI
TOMITA NAOYA
HORI MITSUTAKA
HINATA JUMPEI
SAITO NARIYASU
HANADA KAZUNARI
TOMITA NAOYA
HORI MITSUTAKA
Application Number:
JP2019211533A
Publication Date:
May 27, 2021
Filing Date:
November 22, 2019
Export Citation:
Assignee:
DAIDO STEEL CO LTD
NIPPON DENJI SOKKI KK
NIPPON DENJI SOKKI KK
International Classes:
H02K15/03; H01F13/00; H01F41/02; H02K1/27
Domestic Patent References:
| JP2014150638A | 2014-08-21 | |||
| JP2014087075A | 2014-05-12 |
Attorney, Agent or Firm:
Shunsuke Umeda
Takahashi politics
Takahashi politics