Direction and speed control

  
This circuit operates like the one shown in Fig, 57-4, The only differences are that the field is placed across the rectified supply and the armature is placed in the SCR bridge. Thus the field current is unidirectionali)ut armature current is reversible; consequently the motor`s direction of rotation is reversible
Direction and speed control - schematic

Potentiometer Rl controls the speed.




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