Besides assuring plentiful availability of standart spare parts; also you can use repair and maintenance services. We can also produce every kind of variable transformers and special propose production on order. www.variacstabilizer.com
what is the total load/weight of the shaft together with the brush-arm for a 500W(500VA),Input 230V,OUTPUT 0-250VAC...l want to determine the torque required to rotate the shaft together with the brush-arm with a motor so i would like to select the right motor with enough torque.
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servo stabilizer uses an automatic variable toroidal transfomer for regulate the voltage at the output. "Automatic voltage regulator" could be a servo or a solid state (you need to see that on the unit description). If it is indeed a "solid state automatic voltage stabilizer" then it is just a transformer with variable secondaries selected by a group of IGBTs or maybe relays.