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The thermal characteristics of de-energized AC motors are largely different from those of operating AC motors. The conventional thermal protection techniques are not capable of providing reliable thermal protection for AC motors operated with intermittent periodic duty cycles. This paper proposes a non-intrusive stator winding resistance and temperature estimation technique for soft-starter-connected...
Active thermal protection techniques have been proposed for the thermal protection of induction motors. By injecting dc signals, the dc model of induction motors can be used to estimate the stator winding resistance, and thus the average stator winding temperature. The injected dc signals may lead to magnetic saturation, which may degrade a motor's performance and increase heat dissipation in the...
AC motors are the main workhorses in process industries. Their malfunction may not only lead to repair or replacement of the motor, but also cause significant financial losses due to unexpected process downtime. Reliable thermal protection of ac motors is crucial for reducing the motor failure rate and prolonging a motor's lifetime. In this paper, conventional thermal protection devices and state-of-the-art...
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