project center in trichy
This paper presents a novel loss minimization
technique for Induction Motor Driven Elevator Systems (IMDES) to determine an
energy optimum velocity pattern. The objective function consists of a
differential equation relating total power losses in the induction motor to its
rotor speed. The constraints are provided in terms of velocity and acceleration
governed by passenger comfort. Since, the velocity and acceleration are state
variables, Pontryagin’s Minimum Principle is used to determine the most optimum
trajectory by forming an appropriate Hamiltonian function. Boundary conditions
are specified and used to obtain the coefficients of the rotor speed equation.
As the velocity is optimized, the total travel time is not fixed and treated as
a variable. A fixed-point iterative procedure is used to estimate the travel
time. Additional loss minimization is incorporated by optimizing the machine
flux for the constrained portion of the velocity pattern. An algorithm for
implementing the optimization scheme is explained in detail. The theoretical
claims are supported with analytical and experimental results. Proposed
technique is developed for IMDES, but it can be easily adapted to other drive
applications as well.
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