Invention Grant
- Patent Title: Sintered ferrite magnet and motor provided therewith
- Patent Title (中): 烧结铁氧体磁体和电动机
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Application No.: US14638635Application Date: 2015-03-04
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Publication No.: US09589713B2Publication Date: 2017-03-07
- Inventor: Yoshitaka Murakawa , Naoharu Tanigawa , Yoshihiko Minachi , Hitoshi Taguchi
- Applicant: TDK CORPORATION
- Applicant Address: JP Tokyo
- Assignee: TDK CORPORATION
- Current Assignee: TDK CORPORATION
- Current Assignee Address: JP Tokyo
- Agency: Oliff PLC
- Priority: JP2014-045446 20140307; JP2015-015810 20150129
- Main IPC: H01F1/11
- IPC: H01F1/11 ; H01F1/03 ; H02K1/02 ; C04B35/26 ; C04B35/626 ; C01G49/00

Abstract:
A sintered ferrite magnet comprises a main phase of an M type Sr ferrite having a hexagonal crystal structure. An amount of Zn is 0.05 to 1.35 mass % in terms of ZnO, the sintered ferrite magnet does not substantially include a rare-earth element (R), and the following Formula (1) is satisfied, where a total amount of Sr, Ba and Ca is M3 in terms of mol, a total amount of Fe, Co, Mn, Zn, Cr and Al is M4 in terms of mol, and an amount of Si is M5 in terms of mol. 0.5≦{M3−(M4/12)}/M5≦4.8 (1).
Public/Granted literature
- US20150255197A1 SINTERED FERRITE MAGNET AND MOTOR PROVIDED THEREWITH Public/Granted day:2015-09-10
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