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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...
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...
This paper proposes a monitoring scheme to detect the state of the cooling capability for soft-starter-connected induction motors. Based on the estimated stator-winding temperature via dc-signal injection, the cooling capability of the motor can be monitored online using only voltage and current sensors. The thermal parameters of a simplified thermal model of the induction motor are identified using...
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