Instantaneous Power Measuring Method for Evaluation of Machining Functionality

Abstract

As machining speed is increased and processing time is decreased, transient or instantaneous power measurement has become necessary. Instantaneous power must be measured by measuring the voltage and current of a balanced three-phase alternating-current power supply directly. Taking a moving average before power calculation can provide power waveforms less affected by measurement noise even in machines incorporating inverter control. This paper introduces an appropriate instantaneous power measuring method and a data processing method by showing examples in which these methods were successfully applied to drilling.