Economical analysis of induction motor for a mine hoist load diagram

This paper illustrates the importance of controllers on energy and cost saving opportunity of induction motor for mine hoist load diagram. The economics of a 100 HP induction motor is investigated with two topologies namely constant Volt/frequency (V/f) controller and Model Based Controller (MBC) using Differential evolution (DE) algorithm in steady-state conditions. In this study, the field excitation in a machine has been considered to adjust to give minimum stator current, minimum operating cost and maximum efficiency for different load/speed. The MBC controller improves the economics in terms of operating cost (energy cost and demand charge cost) and the simulation results show that the slip speed in the most economic motor will be adjusted according to load and speed, particularly at light load.