... control device achieve the purpose of regulating motor speed by changing the motor rotor resistance wound motor speed control device I, mainly features ... and maintenance are convenient.II, Application:Applicable to three-phase AC 380V 660V, 3KV, 6KV,10KV drag fan and pump type ... changed (S≈0.1) , about laden wound rotor type asynchronous motor soft starter and control surging currentIII, How to order,1 ...