Control system for electric motor drive for compressor - uses a time interval greater than time interval for reciprocal value of switching frequency.

摘要

Method for the control of the electric motor drive of a compressor where an additional condition must be fulfilled for the drive to be stopped whilst the pressure value (Pist) prevails. A total time interval comprising a first time interval (t1) and a second time interval (t2) must be greater than the time interval which corresponds to the reciprocal value of a given switching frequency (SH), using a risk factor (k) between 0.5 and 0.9. ADVANTAGE - Control which optimises the conditions for switching off compressed air compressors and screw compressors of all kinds.