Air compressor

An air compressor comprising:

• a compressor unit comprising:
• a front housing including a front inlet through which air is drawn, and a compressor scroll configured to compress drawn air;
• and a compressor impeller disposed between the front inlet and the compressor scroll and configured to transfer the air drawn through the front inlet toward the compressor scroll;
• a motor unit comprising a motor housing coupled with the front housing, a stator disposed along an inner circumferential surface of the motor housing, and a rotor disposed to pass through a central portion of the stator and coupled with the compressor impeller by a rotating shaft;
• a turbine unit comprising a rear housing coupled with the motor housing, a turbine impeller coupled with the rotating shaft, and a turbine scroll formed in the rear housing and configured to exhaust air that has passed through the turbine impeller to an outside;
• and
• an air cooling unit coupled with the compressor scroll to receive compressed air from the compressor scroll and cool the stator and the rotating shaft;
• and
• wherein the air cooling unit comprises:
• a bypass passage coupled with the compressor scroll;
• a first inlet passage coupled with the bypass passage and connected with a first space in which the stator is disposed in the motor housing;
• and
• a second inlet passage coupled with the bypass passage and connected with a second space in which a thrust bearing is disposed in the motor housing;
• and
• the first inlet passage and the second inlet passage are separated from each other in the motor housing, so compressed air flows separately into the first space and the second space, respectively.