Speed Control Of D.C Shunt Motor Using 12 Pulse Rectifier

As technology grows day by day, the study of power system has shifted to power electronics to produce the most efficient energy conversion. Power electronic is the study of processing and controlling the flow of electric energy by supplying voltages and currents which is suited for user loads. Power electronics are used to obtain the benefit of lower cost and high energy efficiency. Twelve pulse topology commonly found in adjustable speed drives. It is expensive but produces least input current harmonics. Application like heating, ventilating, air conditioning due to its less input current harmonic. Rectifier is the power processor which gives dc output voltages with minimum amount of harmonics. When poly phase is rectified which produce smoother dc output than single phase dc rectifier. When three phase input Is available, rectifiers can come in a variety of pulses such as six pulse and twelve pulse. If the no of pulses increases the input characteristic improves.