ROTOR CORE STEEL PLATE AND METHOD FOR MANUFACTURING SAME

WIPO Patent Application WO/2012/137430

A1

Provided is a rotor core steel plate and a method for manufacturing the same wherein reinforcement for preventing an ineffective magnetic field and dealing with centrifugal force at a bridge part can be achieved with high productivity. According to the method of the present invention for manufacturing a rotor core steel plate (3) comprising a magnetic slot (9) for a built-in magnet, a bridge part (15) between an outer circumferential edge of the rotor core steel plate (3) and the magnetic slot (9) is flattened in the plate thickness direction to form a flattened part (17) which provides a compressive residual stress. The flattened part (17) reduces flux leakage by worsening magnetizing properties, and has the function of countering centrifugal force, and a magnetic field is generated mainly in a vertical direction on a long side of the magnet. An ineffective magnetic field at the bridge part (15) is reduced, and therefore a magnetic field effective for rotor rotation is increased.

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IWATA KAZUO (JP)
HIRAHARA MAKOTO (JP)
KAMEDA YOHEI (JP)
SAKAKITA KAZUHIRO (JP)

PCT/JP2012/001948

October 11, 2012

March 21, 2012

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NHK SPRING CO LTD (JP)
IWATA KAZUO (JP)
HIRAHARA MAKOTO (JP)
KAMEDA YOHEI (JP)
SAKAKITA KAZUHIRO (JP)

H02K1/22; H02K1/27; H02K15/02; H02K15/03

JPH1118324A	1999-01-22
JP2002252938A	2002-09-06
JP2006325297A	2006-11-30
JP2011135726A	2011-07-07

SUDO, Yuichi (JP)
Yuichi Sudo (JP)

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