A SOLUTION OF IMPROVING EFFICIENCY OF THE MECHANICAL PUNCH PRESSES EQUIPPED WITH TORQUE-CONTROLLING VARIABLE SPEED DRIVES

摘要

This paper presents a solution of improving the efficiency of the punch presses equipped with variable speed drives, in case of working in continuous mode (automatically fed with material). The solution consists in uniform motor torque spreading along a working cycle, so that the no-load portion, when motor has the worst efficiency, is eliminated. The effectiveness of this method was tested by numerical simulation, using a press model which was built and experimentally validated by the authors. There are presented numerical and graphical results showing the new behaviour of the motor and the amount of efficiency gained in different operating situations.