| 摘要 |
<P>PROBLEM TO BE SOLVED: To perform a changeover to a position detecting operation reliably in a short time. <P>SOLUTION: This device has a V/F ratio drop rate setting part 13 that reduces V/F ratio until changeover conditions to the position detecting operation is met, and that supplies a V/F ratio decrement command to a V/F pattern setting part 14 to change the decrement of the V/F ratio in accordance with voltage range that holds the changeover conditions. <P>COPYRIGHT: (C)2003,JPO |
