STEEL SHEET FOR ROTOR CORE OF INTERNAL PERMANENT MAGNET MOTOR, AND ITS MANUFACTURING METHOD

Title:

STEEL SHEET FOR ROTOR CORE OF INTERNAL PERMANENT MAGNET MOTOR, AND ITS MANUFACTURING METHOD

Document Type and Number:

Japanese Patent JP2009046738

Kind Code:

A

Abstract:

To provide a steel sheet for a rotor core by which, when used as a rotor core of an IPM motor, strength can be increased without reducing a reluctance torque of the IPM motor.

A hot rolled steel sheet, which has a component composition containing, by mass, 0.06 to 0.90% C, 0.05 to 3.0% Si, 0.2 to 2.5% Mn, 0.05% P, 0.02% S and 0.005 to 4.95% acid-soluble Al under the condition satisfying Si+Al=5.0% and having the balance Fe with inevitable impurities, is cold rolled. The resulting cold rolled steel sheet is subjected, in a continuous annealing line or a continuous hardening line, to heating to 750C, cooling to 450C at 10C/s cooling rate and holding in a range of 200 to 500C for 120 sec to obtain a steel sheet showing 780 N/mm2 yield strength at a tensile test and 1.2 T magnetic flux density B4000 at 4000 A/m.

Inventors:

FUJIWARA SUSUMU
KONDO TOSHIHIRO
KODAMA SHINICHI

Application Number:

JP2007215382A

Publication Date:

March 05, 2009

Filing Date:

August 22, 2007

Export Citation:

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