公开(公告)号：EP1278290A1

公开(公告)日：2003-01-22

申请号：EP02010859.3

申请日：2002-05-15

申请人： Nissan Motor Co., Ltd.

发明人： Kobayashi, Masakazu ,  Ohtsuka, Koji

IPC分类号： H02K9/19

CPC分类号： H02K1/32 ,  H02K9/19

摘要： A cooling structure for a rotating electric machine is proposed which displays high cooling performance with a simple structure, does not undergo reductions in efficiency when the rotating electric machine is operating at high rotation speeds and has high reliability. The rotating shaft (2) of the rotating element (1) comprises a hollow structure and an inner cylindrical section (6) which rotates together with the rotating shaft is provided with a space in an inner section of the rotating shaft (2). Coolant flows in an annular gap (7) between the rotating shaft (2) and the inner cylindrical section (6). In this manner, the rotating element is effectively cooled with a small amount of coolant.