Energy Conservation Studies on a Spinning Drive Motor with Scalar and Vector Controllers

This paper discusses the importance of controllers on energy saving opportunity of partial loaded three-phase induction motor in textile mill (ring spinning frame) applications. The economics of a scalar controlled 50 HP induction motor is investigated with three topologies namely Full Voltage (FV), Reduced Voltage (RV) and Vector Control (VC) in steady-state conditions for different loads. In RV, the reduced voltage is applied to machine while VC is used to provide minimum flux level, to maintain required load. The machine has been considered to adjust to give minimum operating cost for the textile mill load. The flux controller in VC improves the economics in terms of operating cost (energy cost and demand charge cost), according to load and speed, particularly at light load.