Variable Speed Drive, Ac Drives, DC drives, process monitoring & control systems, PLCHMISCADA based systems, PC based automation systems, soft starters, etc. Our range of variable frequency drives (VFDs) are used for controlling the rotational speed of alternating current (AC) electric motor.• Energy Savings with Variable Speed Drives • Variable Torque Versus Constant Torque • Why Variable Torque Loads Offer Great Energy Savings • Energy Consumption