| 摘要 |
<p>PURPOSE:To miniaturize a device by mounting a current detector at a position where three-phase total currents flow. CONSTITUTION:A three-phase induction motor 6 is supplied with DC voltage fed through a filter reactor 2 and a filter capacitor 3 from a DC power supply 1 as three-phase AC voltage by ON-OFF controlling semiconductor elements 5A-5F constituted of three-phase six arms. On the other hand,only one current detector 7 for detecting phase short circuit is set up at a position where three- phase total currents flow. Accordingly, the title device can be miniaturized and lightened.</p> |
