Motor having internal coolant supply passage

A motor comprising:

• a rotor supported by an output shaft-side bearing and a counter-output shaft-side bearing;
• an enclosure member including a front housing supporting the output shaft-side bearing, a rear housing supporting the counter-output shaft-side bearing, and a stator to which the front housing and the rear housing are installed at both ends and surrounding the rotor;
• an output shaft-side coolant supply port disposed at an outer circumference of the enclosure member;
• an output shaft-side coolant supply path that supplies coolant from the output shaft-side coolant supply port to an output shaft side;
• a counter-output shaft-side coolant supply port disposed at an outer circumference of the enclosure member;
• a counter-output shaft-side coolant supply path that supplies coolant from the counter-output shaft-side coolant supply port to a counter-output shaft side;
• a temperature measurement unit that measures a temperature of the enclosure member;
• a switching part that switches between a plurality of coolants based on the temperature of the enclosure member measured by the temperature measurement unit;
• and
• a coolant flow path that connects the output shaft-side coolant supply port and the counter-output shaft-side coolant supply port to the switching part.