Study and Implementation of DSP Based Sensorless Speed Control of Induction Motor

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Addis Ababa University


Variable speed induction motor drives that operate without speed or position sensors have the benefits of reduced drive system’s size and overall cost as well as high system reliability. The objective of this thesis is to design, develop, implement and test a sensorless speed vector control scheme that has a dynamic performance close to a sensored motor drive. Sensorless vector controlled drive require estimating the rotor speed as well as magnitude and spatial orientation of the magnetic flux in the stator or rotor. The methodology used here is to implement a Model Reference Adaptive flux and speed observer (MRAS) to estimate the flux and speed from measured terminal voltages and currents. The performance of the proposed system is first investigated through simulations by considering the speed tracking, torque response quickness and sensitivity to parameter variation. The simulation results obtained agree with the design objective. Finally, a control algorithm is developed using block programming capability of the Real Time Workshop (RTW) and Code Composer Studio. Then the developed control algorithm is implemented using Texas Instruments Digital Signal Processor F2812 on a general purpose 1.1KW induction machine. Keywords: Induction motor, vector control, MRAS, RTW, DSP.



Induction motor;vector control; MRAS; RTW; DSP