Patent ID: 6551065
Filing Date: 2003-04-22
Classification: F04D

Abstract:
A fan protection device, to protect a fan, comprising:a temperature detector, for detecting overheating of the fan, having a temperature-voltage transformer, located at the thermo-generating source of the fan to transform the thermo-energy thereof into a corresponding voltage signal, and an overheating-judgment device to determine whether the temperature of the fan exceeds a predetermined temperature according to the voltage signal output from the temperature-voltage transformer and, further, detect whether the fan is overheated; a current detector coupled to the temperature detector to detect driving-current overload of the fan, wherein the current detector has a current-voltage transformer located on the path of the current flow of the fan to transform the current of the fan into a corresponding voltage signal, and an overloading-judgment device to determine whether the current of the fan surpasses a predetermined current value according to the voltage signal output from the current-voltage transformer and, further, detecting whether the fan is overloaded; and an alarm unit, for stopping the fan when an event is detected.