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In resistance-based rotor temperature estimation schemes, a rotor temperature is derived from a resistance quantity based on an induction motor equivalent circuit model. This temperature is susceptible to fluctuations in the motor's supply frequency. In this paper, a complex adaptive phase discriminator is proposed to track supply frequency fluctuations for grid-connected induction motors. A frequency-selective...
Until recently, power plant operators have had very limited options for on-line monitoring of the health of motor and generator rotors, particularly those with brushless excitation systems. Degradation of field winding insulation can lead to ground faults or shorted turns, with little or no warning. Moreover, the capability to monitor local hot spot temperatures on rotor windings in service has not...
With the development of electrical machines in specific working conditions, the significant increase of power energy losses take place while their thermal capability is constantly decreased. The thermal overheating and cycling degrades the integrity of the materials used for stator winding insulation, resulting in acceleration of thermal aging. A new approach for induction motor temperature monitoring...
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