In this paper, a new approach is proposed for eccentricity fault detection in induction motors and estimation of the exact severities of the fault components. By using the Kalman filter estimator, the presented method can estimate degrees of the static, dynamic, and mixed eccentricity faults in the induction motors. The Kalman filter is a robust estimator having high capability in estimating the state variables of a dynamic system. This filter has many practical applications in industrial and nonindustrial systems and can implement continues-/discrete-time dynamic systems varying linearly or nonlinearly. In this paper, due to the nonlinear and continuous nature of the induction motor, the unscented Kalman Bucy filter (UKBF), which is a nonlinear continuous-time filter, is employed. At first, the model of the eccentric induction motor is simulated. Then, by using this model, the measured quantities and the Kalman filter, the eccentricity fault is detected, and the exact severities of the fault components (static, dynamic, and mixed) are estimated for a real motor that has been artificially made to be eccentric.According to the attained results, it is demonstrated that the conducted approach has high capability in estimating the exact severities of the fault components, and it shows efficient performance in all eccentricity states.