| 摘要 |
PROBLEM TO BE SOLVED: To increase cooling capacity for rotor magnets while reducing a drag loss.SOLUTION: Since coolant outflow paths 43 are formed only one face at the center position in a rotor core 21 in the axial direction, a flow of cooling oil in the axial direction at a gap G between a rotor 20 and a stator 10 becomes only a flow outside the axial direction running from the center position to both end parts, which can reduce a drag loss caused by a stay of the cooling oil. By making the cooling oil run through first and second magnet cooling paths 41a, 41b, 42a, 42b extending in the axial direction between both end parts in the axial direction of the rotor core 21, permanent magnets 22a, 22b can be cooled throughout the whole axial direction.SELECTED DRAWING: Figure 2 |
