Patent ID: 7936549
Filing Date: 2011-05-03
Classification: G01R,H01H

Abstract:
1. A state grasp device, which is disposed in an electromagnetic operating system including a fixed iron core, a moving iron core constructed movably with respect to said fixed iron core, and an electromagnetic coil that is excited by a driving power supply, and causes said moving iron core to travel, thereby driving an operated apparatus that is connected to said moving iron core, the state grasp device comprising: measurement means for measuring a current flowing through said electromagnetic coil or a voltage to be generated at said electromagnetic coil; search means for obtaining change information that is changeable owing to a passage of time and use of said operated apparatus or said electromagnetic operating system, on an output waveform from said measurement means, said search means including an inflection point search means for searching an inflection point on output-time characteristics indicating a change with time of output values that are obtained from said measurement means, and for obtaining at least one kind of information out of time information, current value information, and voltage value information at said inflection point; and estimating means for estimating a state of the operated apparatus or electromagnetic operating system on the basis of said change information from said search means.