It has a cooling system using the air around Turbo Blower without special cooling air.
A cooling fan to cool down a high-speed motor is installed on a first shaft of the high-speed motor in the air-end.
When the cooling fan rotates, the air around the air-end flows into the high-speed motor
through a cooling air inlet that is installed in the motor body and cools down a stator and a rotor,
and then is discharged to the outside through a cooling air silencer.
The main heat source of the electric unit is an inverter.
Therefore a cooling fan that is installed in the inverter is used, or a separated cooling fan is additionally installed.
A medium filter is installed in the inlet side to assure the quality of cooling air.