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Short-circuit fault of stator winding due to aging of electrical insulation is one of the most probable faults in motor drive systems. The authors have proposed a simple method for diagnosing the fault probabilistically by considering distributions of features, i.e. magnitude and phase of load current. Laboratory experiments proved that the method was promising. In order to enhance accuracy of diagnosis,...
This paper proposes a novel and simple method for diagnosing insulation failure (short-circuit) in stator windings of motors under load conditions. The method involves probabilistic process for gauging the probability of failure occurrence by considering distributions of features, i.e. magnitude and phase of current flowing into stator windings, depending on the condition of the insulation failure...
Insulation failure of motor windings is one of faults that are likely to occur during the lifetime of motors. The authors have proposed a novel and simple method to diagnose insulation failure in a stator winding in terms of “fault probability”, which is calculated on the basis of feature distributions of magnitude and phase of current flowing into windings. Validity of the method was confirmed under...
Nonlinear receding horizon control (NRHC) attracts much attention in recent years. For NRHC, C/GMRES proposed by Otsuka is one of the most effective methods. Generalized minimal residual method (GMRES) is employed in C/GMRES, however, GMRES may become numerically unstable under some conditions in the sense of numerical calculation. This results in instability of the controlled system in the sense...
Receding horizon (RH) control attracts much attention in both the control theory and control applications. For RH control, we have proposed a new computation method for solving simultaneous linear equations by using a Moore-Penrose pseudoinverse and a singular value decomposition (SVD). In our proposed method, SVD is achieved by mdLVs and newly developed simultaneous error correction (SEC) method...
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