Patent ID: 8894379

Claim:
A gas compressor comprising: a gas compressor element; a variable speed motor powering the gas compressor element; a motor control unit for the variable speed motor having a setting for a maximum number of revolutions (Nmax) for the compressor element; an air blower arranged to suck environmental air via an inlet and to blow it back to the environment through a housing via an exhaust; a cooling circuit arranged to cool gas which has been compressed by the compressor element; a first temperature sensor arranged to sense an environmental temperature; said housing configured to contain said gas compressor element, variable speed motor, motor control unit, air blower, and cooling circuit, wherein said housing comprises an electronic compartment which is equipped with a second air cooling blower configured to suck in environmental air via an entrance and blow it back into the environment via an exit, an additional cooling arrangement to cool the air moved by the second air cooling blower of the electronic compartment, a second temperature sensor configured to sense a temperature of air that is cooled by the additional cooling arrangement, and an arrangement to increase a cooling capacity of the additional cooling arrangement when the sensed temperature of the cooled air cooled by the additional cooling arrangement rises above a set maximum additional cooling arrangement critical level (T 22 max), and an arrangement for adjusting the additional cooling arrangement, wherein said additional cooling arrangement being operational when the sensed environmental temperature approaches a level above a maximum set environmental temperature level (Tmax), wherein the cooling capacity of the additional cooling arrangement is adjustable so that the temperature of the cool air which flows through the electronic compartment is maintained under the maximum additional cooling arrangement critical level (T 22 max), and wherein the motor control unit includes an algorithm that reduces the maximum set number of revolutions (Nmax) by a desired level when the sensed environmental temperature rises above the maximum set environmental temperature level (Tmax) and increases the maximum allowed set number of revolutions (Nmax) when the sensed environmental temperature falls below said maximum set environmental temperature level (Tmax).