PURPOSE: To improve the flow of the magnetic flux of a fundamental wave and concurrently reduce the losses generated by the magnetic fluxes of higher harmonics and in its turn improve the characteristic of a rotating machine, by constituting a magnetic wedge for a slot through bonding an amorphous thin band to the surface of the magnetic wedge or through burying the amorphous thin band in the magnetic wedge.
CONSTITUTION: By compressing an iron powder or ferrite, or by molding it with a resin, a magnetic wedge 3 of five microns to several tens of microns in its relative permeability is obtained. By providing an amorphous thin band 4 of about several micrometers to several tens of micrometers in its film thickness on the surface of the magnetic wedge 3, a composite magnetic wedge 5 is obtained. For example, the amorphous thin band 4 is an alloy band made of 75% first material and 25% second material. The first material is made of 88% Co, 6% Fe, 4% Ni, and 2% Nb. The second material is made of 40% Si and 60% B. Further, the composite magnetic wedge 5 is so stored in a slot 2 of a stator core 1 as to block up an opening part 2a of the slot 2. Thereby the flow of the magnetic flux of a fundamental wave is improved by the magnetic wedge 3, and concurrently, various losses generated by the magnetic fluxes of higher harmonics can be reduced by the amorphous thin band 4.
Hinode Sadayoshi
Tadayuki Sato
Takao Sawa
Yasuo Sakata
Kimura Tadaho
Shigeo Ozawa
