logo

For the Inventor, By the Inventor

The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 9847168 B1

PDFFull Text
Date of Patent:
Dec. 19, 2017

Filed:

Mar. 27, 2013

Method for manufacturing steel sheet for rotor core for ipm motor

Applicant:

Nisshin Steel Co., Ltd., Tokyo, JP;

Inventors:

Tomonaga Iwatsu, Hiroshima, JP;

Yukio Katagiri, Hiroshima, JP;

Susumu Fujiwara, Hiroshima, JP;

Akito Kawamoto, Hiroshima, JP;

Assignee:

Nisshin Steel Co., Ltd., Tokyo, JP;

Attorney:

Rothwell, Figg, Ernst & Manbeck, P.C.

Primary Examiner:

Brian Walck

Int. Cl.
CPC ...
C21D 8/02 (2006.01); H01F 41/02 (2006.01); C21D 8/12 (2006.01); C22C 38/00 (2006.01); C22C 38/06 (2006.01); H01F 1/16 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/08 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/16 (2006.01); C22C 38/18 (2006.01); C21D 6/00 (2006.01); C22C 38/20 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01); H02K 15/00 (2006.01); C21D 9/573 (2006.01); C21D 9/46 (2006.01);
U.S. Cl.
CPC ...
H01F 41/024 (2013.01); C21D 6/001 (2013.01); C21D 6/002 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/02 (2013.01); C21D 8/12 (2013.01); C21D 8/125 (2013.01); C21D 8/1244 (2013.01); C21D 8/1283 (2013.01); C21D 9/573 (2013.01); C22C 38/00 (2013.01); C22C 38/002 (2013.01); C22C 38/004 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/08 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/16 (2013.01); C22C 38/18 (2013.01); C22C 38/20 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C22C 38/32 (2013.01); H01F 1/16 (2013.01); H02K 15/00 (2013.01); C21D 8/1233 (2013.01); C21D 9/46 (2013.01); C21D 2211/002 (2013.01); C21D 2211/008 (2013.01);
Abstract

The present invention manufactures a steel sheet for a rotor core for an IPM motor, wherein the steel sheet has a magnetic flux density Bof 1.65 T or more as measured when magnetic field strength is 8000 A/m, and a residual magnetic flux density Br of 0.5 T or more as measured at that time, and optionally, a coercivity Hc of 100 A/m or more as measured after magnetization reaches 8000 A/m. By using the steel sheet manufactured according to the present invention for a rotor core of an IPM motor, it is possible to increase further an output torque in a high-speed rotational range and raise further the maximum rotational speed.

Find Patent Forward Citations

Loading…