| 摘要 |
PURPOSE:To eliminate an erroneous operation due to electromagnetic noise by comparing the magnitude of the electromagnetic wave based on a spark at every unit time with the prescribed value, and counting the number of rotations within the prescribed time when becoming the prescribed value or higher to discriminate the production of the spark by the number of rotation. CONSTITUTION:In a monitor for monitoring a spark generated between a current collecting ring and a brush of a rotary electric machine as an electromagnetic wave, an electromagnetic wave corrected by an antenna 1 is input to a wave peak discriminating memory 2, and the output of a peak holding unit 9 is multiplied by a multiplier 4 by the output of time width calculator 3. Further, the production of a spark at every unit time and the intensity are numerically collected through an integrator 11, a gate circuit 13 and a coounter 14. The output of the counter 14 is compared by a comparator 16 with the set value 17, and the number of the outputs which become the set value or higher is counted by a memory 18 and a counter 19. When the number becomes the prescribed value or higher, it is judged as the generation of the spark to generate an alarm from an alarm unit 20. |
