A low cost simple solution for reducing starting transient currents in low power dc motors

DC motors find their use in applications requiring high starting torque and constant speed. They are still existing in some applications majorly due to their simple design and control and their low cost as compared to same rated AC motors. One key limitation of DC motors is the high starting current in the armature due to low armature resistance and lack of back emf. The conventional technique is to use 3 pin and 4 pin starters which are simple rheostats whose value is manually decreased thereby increasing the current in a smooth manner rather than applying abruptly high current in single throw of a switch. This method suffers from some limitations such as power loss, bulkiness and many more. The proposed solution is to use a capacitor in parallel to the voltage supply which will absorb the initial high current transients and also provide a backup voltage supply in case of failure of the primary supply applied