3 Phase Variac Motorised Transformer

These transformers are widely used in many industries and laboratories to control voltage, current, power, heat, speed, light and electromechanical forces. Auto variable transformers use common windings and offer no interference or disturbance isolation.

Basically variable voltage transformers comprises of a single layer, magnet wire winding on a toroidal core of laminated silicon steel. A carbon brush, connected to an output lead, is rotated over a precision ground, plated commutator track 10 tap off voltage at any turn from zero to the maximum output voltage of the winding.