Cooling passage in the slots of a rotating electric machine

摘要

A rotating electric machine using an inner section of a slot of a stator as a cooling passage obtains highly effective cooling performance with a small amount of cooling medium. An opening for a slot (25) in a stator (5) is closed by an under plate (40) having a closing member. A regulating plate (41) is disposed which is a member for regulating the cross-sectional area of the passage in substantially a central section of the slot (25). In this manner, the cross-sectional area S2 of the cooling passage (29A) with the plate in the slot (25) is smaller than the cross-sectional area S1 when the regulating plate (41) is not provided by an area corresponding to the cross-sectional area of the regulating plate (41). This arrangement allows increases in cooling efficiency.