Totally-enclosed traction motor for electric railcar

A totally-enclosed traction motor for electric railcar, comprising:

• frame structure of totally-enclosed cylindrical shape;
• a rotor shaft rotatably supported to said frame structure coaxially with said frame structure;
• a rotor of cylindrical shape coaxially fixed to said rotor shaft which is rotated with said rotor shaft as one body;
• a stator of cylindrical shape fixed to an inner surface of said frame structure coaxially with said rotor shaft, with keeping a gap between an inner surface of said stator and an outer surface of said rotor;
• a fan for air circulation fixed to said rotor shaft which is rotated with said rotor shaft as one body;
• said frame structure being provided with a pair of air windows in an upper part of said frame structure;
• a cooling unit provided on an upper surface of said frame structure, said cooling unit being composed of a pair of connecting sections, a cooling pipe connected between said connecting sections and a plurality of cooling fins fixed to said cooling pipe;
• said connecting sections being fixed to said upper surface of said frame structure so as to cover respective one of said air windows;
• said frame structure being further provided with a window;
• and
• a cooling body mounted to said frame structure so as to cover said window and provided with a plurality of heat absorbing fins fixed to said cooling body from the inside and a plurality of radiation fins fixed to said cooling body from the outside.