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;
• and
• a refrigerant circulation circuit that circulates a refrigerant in a refrigerant channel passing through the motor and cools the motor, wherein
• the refrigerant circulation circuit includes a tank in which the refrigerant is stored, a compressor configured to compress the refrigerant supplied from the tank, a heat exchanger configured to cause the compressed refrigerant to dissipate heat, and an expansion valve configured to expand the refrigerant resulting from heat dissipation,
• a cooling jacket passage configured to cause the refrigerant to flow so as to pass through a vicinity of the fixed ring and/or the secondary seal is in the casing, and the refrigerant channel is configured to guide the refrigerant, which is expanded by the expansion valve, at least to the cooling jacket passage.