| 摘要 |
FIGS. 4 A and 4 B are principle diagrams for correcting deviations among current detectors of a three-phase motor 19 in an inverter apparatus of the present invention, which includes bidirectional switching elements 13 to 18. FIG. 4 C shows on and off states of switches in the cases of FIGS. 4 A and 4 B, in which 1 and 0 mean on- and off-states, respectively. The states shown in FIGS. 4 A and 4 B are alternately repeated by controlling the switches, and measurement for correcting the deviations among the current detectors are obtained in the state shown in FIG. 4 B. Specifically, in <FIGREF IDREF="DRAWINGS">FIG. 4B</FIGREF>, currents having the same amplitude flow on a U phase and a V phase. Accordingly, a difference in the measured data represents a difference in performances of the current detectors. In the state of normal use, the inverter apparatus is operated by correcting detected current values based on the measurement data.
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