The dc voltage applied to the armature is constrained by shifting terminating point. The entryway trigger control circuit can be either an open circle circuit or shut circle, naturally interfacing circuit;

In shut circle control, a tacho-generator is utilized which gives voltage to the comparator relying upon the speed of the engine shaft.

Circuit for speed control of an independently energized dc engine

Single stage half-connect thyristor drive

Scaffold rectifier changes over air conditioning voltage into dc voltage.

The dc shunt field winding is straightforwardly sustained from the extension rectifier. Be that as it may, the armature of the dc engine is encouraged from the extension rectifier through the SCR.

The dc voltage applied to the armature is constrained by shifting the activating point.

The free-wheeling diode D is associated over the engine armature to give a circling current-way (indicated spotted) for the vitality put away in the inductance of the armature twisting at the time SCR kills.

Without free-wheeling diode, current will move through SCR and extension rectifier and in this way forbid SCR from killing.

Circuit for speed control of a DC shunt engine

Single stage full wave thyristor drive

The circuit graph for speed control of a dc shunt engine is appeared in Figure.

In Diodes D1, D2, D3 and D4 structure the scaffold which changes over air conditioning into dc to supply the field twisting of the engine.

During the positive half patterns of info air conditioning supply, SCR1 leads and supplies the armature winding. During negative half cycles, SCR2 is made to lead and supply the armature winding. Subsequently voltage applied to the armature controls the speed of the engine.

The edge of conduction of SCRs can be changed by differing the door current.

Single stage full wave controlled rectifier circuit for Armature voltage control of a DC shunt engine

Armature and field control of Dc engine drive utilizing controlled rectifiers