Anna Philo Antony, Dr. Sankaran R.
In this paper, the problem considered is an induction motor drive capable of operating certain types of loads demanding inverse torque – speed characteristics such as spooler load in a closed loop manner, where the mechanical power output remains nearly the same over the operating range. Such a drive requires a voltage-source inverter at variable frequency and also speed and current feedback configuration. The simulation of spooler drive system driven from a pulse width modulation (PWM) inverter fed induction motor is done using MATLAB/SIMULINK in a closed loop manner. The mechanical profile requires concurrent variation of torque and speed over a range depending on the mechanical dimensions of the take-up spooler and product line specifications. The control scheme is based on the field-oriented vector-control technique where decoupling of the torque and rotor flux variables is achieved and the desired stator current vector in a synchronous rotating frame of reference is generated. A d-q axis to a-b-c transformation followed by a hysteresis current controller is used to realize the desired stator currents. The simulation results indicate satisfactory performance of a typical spooler drive system over the full range of operation.
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