... VF control: Multiple curve could been chosen, Linear V/F curve, 2.0 times power drop ... motors, such as fan, water pump, engraving machine, injection molding machine etc. (2) Open-loop vector control: Steady ... governing, as the speed ratio is 1:200 and 180% rated torque could be output ... suitable for high-Performance universal occasions such as machine tools, centrifuges, cranes and handling equipment, ...