vectrostar r25 - r65 - r120 - VEM motors Finland Oy

B – RUNNING PRINCIPLESI) IntroductionThe starters VECTROSTAR R are designed to reduce a specific startingresistance as gradually as possible and as harmoniously as possible according tothe resistant torque of the machine, ending at a value close to 0, at the end of thestarting sequence.For such a matter, 3 conical electrodes (the top down) are connected to the 3 rotorrings of the motor.Those electrodes are fitting in the starting tank which contains some electrolyte. Thebottom of each electrode bathes in the liquid (made of water mixed with a smallpercentage of conducting soda). The resistance so induced is the Initial StartingResistance (R 0 )NB : The value of this initial resistance can be adjusted with the soda dosesat the commissioning.When the line contactor is energized, and only at this very moment, the motortorque is T so . It is called the Initial Starting Torque.II) Filling of the starting tankWhen the stator line contactor is switched on, the pump motor is powered on. Theelectrolyte coming out from the reserve tank is propelled into the starting tank. Thelevel is rising progressively in the starting tank.The resistance is varying continuously, very smoothly and without any interruption.All the transformed torque curves of the motor are used, offering thus a continuousoptimisation of the torque. The automatic adaptability of the principle is totally used,the resistance is fully adapted at any time.