Honda Motor Co., Ltd.
ELECTRIC MOTOR COOLING STRUCTURE

Abstract:

An electric motor cooling structure includes: a shaft; a rotor arranged on an outer circumference of the shaft; a stator arranged on an outer circumference of the rotor; a magnet received by the rotor; a coolant passage formed on an inner side of the magnet in a radial direction of the shaft; and a heat pipe arranged between the coolant passage and the magnet. The heat pipe includes: a first tubular portion extending in the radial direction of the shaft from a side of the coolant passage to a side of the magnet; and a second tubular portion communicating with an end of the first tubular portion on the side of the magnet and extending in an axial direction of the shaft.