COMPRESSOR DRIVING DEVICE

PURPOSE:To prevent angular velocity of a rotary spindle of a refrigerant compressor from abrupt reduction by increasing load torque of the refrigerant compressor to increase inertia force of the power source side drive system. CONSTITUTION:In hot starting a compressor 4, a self-starting motor is started with power larger than torque required for the compressor 4. In continuous running of the compressor 4, necessary maximum torque is generated at the first piston 8a side in an internal combustion engine 1 just before the maximum required torque for the compressor 4 is generated, to give inertia force to a fly wheel 3 and an internal combustion engine driving system and further generate the necessary maximum torque also at the second piston 8b side while utilizing the inertia force of the flywheel 3 and the internal combustion engine driving system so that the angular velocity of a rotary spindle is prevented from abrupt reduction.