| 摘要 |
<P>PROBLEM TO BE SOLVED: To stop an elevator by detecting that a shift of a magnetic pole phase has become large. <P>SOLUTION: The control device for an elevator includes a magnetic pole phase shift detecting means 30 monitoring a compensation voltage signal of the d-axis current of a permanent magnet synchronous motor 1 and determining that the correction value of the magnetic pole phase has been shifted when the compensation voltage signal of the d-axis current exceeds a set value set in advance. The magnetic pole phase shift detecting means 30 provides a first set value and a second set value larger than the first set value for determining the shift of the correction value of the magnetic pole phase, shifts the operation to a magnetic pole phase correction operation when the shift is the first set value or above and the second set value or below, and stops the permanent magnet synchronous motor 1 when the shift is the second set value or above. <P>COPYRIGHT: (C)2010,JPO&INPIT |
