Thyristor Based Cyclo Converter

The project aims at controlling the speed of a single phase induction motor making use of cyclo convertor mechanism through thyristors. It becomes difficult to control the speed of induction motors that usually operates at constant speed.

The process is carried out in three steps. The project uses a microcontroller of 8051 family interfaced to a pair of slide switches for selecting the required speed range as F, F/2 and F/3. Thyristor is used for the purpose of controlling speed as the Ac supply frequency to the induction motors cannot be changed. As the switches are set the microcontroller generates the pulses to trigger the SCR’s in a dual bridge.

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