Implementation of Field Oriented Speed Sensorless Control of Induction Motor Drive

This paper focuses the hardware realization and implementation of speed-sensorless field oriented control of induction motor drive. For speed sensorless operation, natural observer is applied to estimate the stator currents, rotor fluxes, load torque and rotor speed because of its simple structure and no direct feedback. The configuration of the natural observer is comparable to and as well as its feature is identical to the induction motor. State space model is applied to both the estimator and the induction motor. Load torque adaptation is provided to estimate the load torque and, speed is estimated from the torque, rotor fluxes and stator currents. Direct field oriented sensorless vector control scheme is used and the rotor angle is calculated from the estimated rotor fluxes. Simulations as well as experimental results are presented for various speed and load conditions to demonstrate the performance of natural observer in sensorless vector control applications.

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