HI guys new to this site, I just starting working with plcs and have a question. I have two AC Torque motors (advantage is these ac motors provide a constant torque at stall without burning out the motor). I need to control the torque automatically with a plc (the work with tension sensors to provide the proper amount of torque to keep constant tension in the spooling fiber). In order to control the motors you need to vary only the voltage supply; i.e. variable frequency drives will not work. Someone mentioned an analogue triac output but I have not seen any sort of variable voltage ddrive that can connect to a plc. Does anyone have any solutions. I have to use these AC torque motors, I think servo motors are way beyond my budget. Thanks.
Alex
Alex