Motor-driven supercharger

A motor-driven supercharger comprising:

• a turbine shaft having a turbine impeller in one end;
• a compressor impeller coupled to the other end of the turbine shaft;
• a bearing housing rotatably supporting the turbine shaft;
• a turbine housing surrounding the turbine impeller and coupled to the bearing housing;
• a compressor housing surrounding the compressor impeller and coupled to the bearing housing;
• a motor rotor fixed to the turbine shaft and rotating together with the turbine shaft;
• a motor stator surrounding the motor rotor and fixed within the bearing housing;
• an inverter converting a dc power into an ac power so as to input to the motor stator;
• an inverter controller controlling a frequency and a voltage of the ac power by the inverter on the basis of an external command;
• a driver container accommodating the inverter and the inverter controller;
• and
• an insulating coupling member coupling the driver container to the compressor housing,
• wherein the driver container is formed in a donut shape or a U shape, and
• wherein the insulating coupling member has an air-cooled or water-cooled insulating layer insulating heat in such a manner as to prevent a high temperature of the air discharged from the compressor from being transferred to the driver container.