Patent attributes
An inverter substrate in which heat generating components which make up an inverter control unit are mounted on a rear surface side thereof is accommodated in a case which is made of a material having a good thermal conductivity in such a manner that the heat generating components are closely contact with a base of the case. The case is provided between a pair of air tanks which are disposed parallel to each other at an interval and on a lower side of at least either of an electric motor and compressors in such a manner as to be oriented downwards so that the base is located at an upper position. An air flow generated by cooling fans which are driven by the electric motor is introduced to flow along the base of the case to thereby cool the heat generating components via the case.
