Operation in which the punch removes material from the edge or corner of a strip or blank
Notching is the periodic voltage disturbance caused by the normal operation of power electronic devices (such as a three-phase converter) when current is commutated from one phase to another When the current commutates, there is a momentary short circuit between the two remaining phases, pulling the voltage as close to zero as permitted by system impedances Since notching occurs continuously, it can be characterized through the harmonic spectrum of the affected voltage