The present invention relates to a controller unit for controlling the speed of a motor (3) for driving an oil injection compressor (1), wherein said controller unit (9) comprises: a data connection (12, 13). , 14); a first module (17) configured to receive data via said data connection (12, 13, 14); Thereby, the controller unit (9) further comprises a processing unit (18a) which determines a minimum working speed (rpmmin) of the motor (3) based on the measured working pressure (pt), the ambient temperature (also). and a dew point temperature (dew point); and a comparator unit (19a) configured to compare the determined minimum working speed (rpmmin) with the recovered working speed (rpm) of the motor (3) and said processing unit (18a) further comprising a generating unit signal (20a) configured to send a signal to said motor to increase the working speed (rpm) of motor (3) to at least the determined minimum working speed (rpmmin) if said recovered working speed (rpm) ) is less than the determined minimum working speed (rpmmin). figure 1.
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