公开(公告)号：US20200220421A1

公开(公告)日：2020-07-09

申请号：US16736965

申请日：2020-01-08

Applicant: DENSO CORPORATION

Inventor： Shohei YOSHIOKA ,  Atsuo ISHIZUKA

IPC: H02K5/20 ,  H02K9/19 ,  H02K11/21 ,  H02K24/00

Abstract: A rotary electric machine includes a cylindrical portion. In the cylindrical portion, a coolant passage having annular shape is formed to allow the coolant to flow therethrough. The coolant passage is formed meandering in the axial direction and the passage width of the coolant passage in a first end side in the radial direction is narrower than the passage width in the radial direction in the second end side. The coolant passage includes a circumferential passage in the first end side where the coolant flows in the circumferential direction. The circumferential passage is configured such that a passage opening area of an intermediate portion between an input portion in an upstream side of the coolant passage and an output portion in a downstream side of the coolant passage is expanded compared to those of the input portion and the output portion.