Better data on vector control technology
As part of its on-going research program, INVT – which manufactures low, medium and high voltage inverters, servo drives and brake units – needed better data on its vector control technology. This is one of the four main control methods for VFDs; the others are Volts/Hertz, Slip frequency and Direct Torque control. INVT worked in co-operation with HBK to build a dynamic mathematical model that could then be used to optimize the control algorithm of VFD to improve its performance. The optimized algorithm ramps up the motor gradually and smoothly, yet can be programmed to run the motor at a precise speed, stop at a precise position, or apply a specific amount of torque.