Scr Motor Diagram. Thyristors have taken over most of the power switching applications that were once handled by relays although very high voltage contactors are still used. Posted on april 16th 2017 1209 pm.
Eg for ac motor speed control. Before going into details about how firing angle control is achieved in this system let us have a quick look at back to back connection of scr. Or dc voltage as above.
Not only does this give maximum control of your heat process but it can extend heater life many times over other control methods.
It can be seen from the circuit diagram shown in figa that at the instant of turning on of the scr gate current flows through r l and diode. Here is a video describing a back to back scr connection. The thyristor or silicon controlled rectifier scr is a particularly useful component and it finds many uses in areas like power control where these components can be used to switch high voltages and currents. The motor will be having two windings namely field winding and armature winding.