Patent ID: 6093988
Filing Date: 2000-07-25
Classification: H02K

Abstract:
A rotating electric machine comprising:(a) a rotor having a rotating shaft;(b) a bearing for supporting said rotating shaft;(c) a radiation resistant grease applied to said bearing; and(d) a shield layer for shielding said grease from radiation, said shield layer being made of lead and surrounding said bearing,wherein said shield layer comprises (1) a first cylindrical shield member that is positioned to cover said bearing, such that said bearing is shielded from a first radiation that is in a direction substantially perpendicular to an axis of said rotating shaft, and (2) second and third disk shield members that are positioned to interpose therebetween said bearing in a direction along said axis of said rotating shaft, such that said bearing is shielded from a second radiation that is in a direction substantially along said axis of said rotating shaft.