Abstract: The motor cooling system of the present invention is a system for cooling a three-phase alternating current motor mounted on a vehicle as a traction motor where oil is introduced as cooling oil from driving-related equipment of the vehicle, wherein the traction motor is equipped with a stator having a neutral point, wherein the vehicle is in a high-load driving state when a larger load is applied to the traction motor than a predetermined amount, the neutral point contacts the cooling oil with a larger contact amount than when the vehicle is not in the high-load driving state.

Abstract: The motor cooling system of the present invention is a system for cooling a three-phase alternating current motor mounted on a vehicle as a traction motor where oil is introduced as cooling oil from driving-related equipment of the vehicle, wherein the traction motor is equipped with a stator having a neutral point, wherein when the vehicle is in a high-load driving state of driving in a state of a larger load's being applied to the traction motor than a predetermined amount, the neutral point contacts the cooling oil with a larger contact amount than when the vehicle is in a driving state of not the high-load driving state.

Abstract: A motor has a rotor, a housing and a stator including a substantially ring shaped yoke portion, a wire mounting portion provided on the yoke portion and having a core portion and pluralities of passage portions extending in an axial direction of the core portion and a wire wound around the wire mounting portion, wherein the wire is mounted to the passage portions which is at a position having a predetermined interval each other in a circumferential direction of the core portion and aligns along with an axial direction end face of the core portion, and the core portion has a width reducing portion of which width dimension in the circumferential direction is reduced from an interior of the core portion to an exterior of the core portion.