Patent ID: 6933633

Claim:
A rotating electric machine comprising: a rotor; a substantially cylindrical stator core having teeth and a back core from which the teeth project; stator coils wound on the periphery of the teeth of the stator core; a slot formed between two adjacent teeth; a first cooling medium passage extending along an axial direction of the stator core, the first cooling medium passage formed in the slot and between two adjacent stator coils by sealing the slot opening facing the rotor; and a second cooling medium passage extending in parallel to the first cooling medium passage, the first and second cooling medium passage allowing flow of cooling medium; wherein the stator core forms at least a section of the passage wall of the second cooling medium passage; wherein the stator core includes a straight line in an axial direction on the surface of the slot such that the distance from the straight line to the cylindrical outer peripheral face of the stator core is equal to a minimum width Wmin of the back core; wherein the teeth comprise tips facing the rotor and rectangular parallelepiped trunks provided between the tip and the back core, the stator coils being wound around the trunks; wherein the second cooling medium passage is disposed in the back core between a first plane which extends along a radial direction of the stator core and includes the straight line on the surface of the slot and a second plane including a side face of the trunk of the teeth; and wherein the distance in a radial direction between the outer peripheral face and the surface of the second cooling medium passage is greater than or equal to the minimum width Wmin.