Sensorless Speed And Position Estimation Of PMSM Based On Sliding Mode Observer With Tan Hyperbolic Function

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Sinusoidal Permanent Magnet synchronous motors have become more popular for new drives. Advantages of PMSMs includes high torque to inertia ratio, high efficiency and high power density. For the PMSMs it is necessary to estimate the rotor position and speed as well. A good error filtering, low angle error and dynamic performance can be obtained with feedback observers. The sliding mode observer (SMO) is one of the observers with a system model suitable for PM synchronous motors. The study deals with the analysis based on simulation of PMSM with space vector pulse width modulation in MATLAB environment. In this paper sensorless estimation of speed and position using SMO with tan hyperbolic function achieved. The result is compared with SMO using sigmoidal function. The simulation results shows that sliding mode observer with tan hyperbolic function gives smooth performance. Keywords: PMSM, Sliding Mode observer,Sigmoidal function, tan hyperbolic function