Motor system

A motor system for cooling a mechanical seal provided for a rotating shaft of a motor, the motor system comprising:

• a mechanical seal that has a rotating ring mounted on the rotating shaft and a fixed ring fixed to a casing of the motor via a secondary seal and that is configured such that the rotating ring and the fixed ring abut each other at predetermined pressure in an axis direction of the rotating shaft;
• a tank in which a coolant to be supplied to the mechanical seal is stored;
• a pump configured to pressure-feed the coolant stored in the tank;
• a coolant channel that guides the coolant, which is pressure-fed by the pump, to a vicinity of the mechanical seal;
• and
• a refrigerant circulation circuit that circulates a refrigerant in the motor and cools the motor, wherein
• the casing includes a cooling jacket passage, the cooling jacket passage being configured to cause the coolant to flow through a vicinity of the fixed ring and/or the secondary seal, and
• the coolant channel includes a coolant heat exchanger configured to perform heat exchange between the coolant in the coolant channel and the refrigerant in the refrigerant circulation circuit and is configured to guide the coolant, which is cooled by the coolant heat exchanger, to at least the cooling jacket passage.