| 摘要 |
<P>PROBLEM TO BE SOLVED: To quickly sensing a dielectric breakdown, and improve the sensitivity. <P>SOLUTION: A dielectric breakdown detector includes a hysteresis comparator controlling means (circuit) for implementing a current hysteresis control for limiting an current from an inverter within a range, between a lower limit instruction value and an upper limit instruction value; a measurement means (circuit) for measuring a repeat count of the hysteresis control; and a determination means (circuit) for comparing a measurement value of the repeat count of the hysteresis control acquired by the measurement means with a threshold value set, based on the repeat count of the hysteresis control during a normal operation, and determining an occurrence of the dielectric breakdown in a winding if the threshold value is exceeded. <P>COPYRIGHT: (C)2007,JPO&INPIT |
