| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a motor driving device capable of accurately detecting a point passage position by preventing erroneous detection. <P>SOLUTION: The motor driving device includes a motor position capturing means 14 for capturing a position counter value in a motor position detector 21 by serial communication at the timing of the edge of a motor position latch signal 18 generated at a constant cycle for storing the position counter value in numbers equivalent to the past (n) times, a counter storing means 12 for storing the value of an internal counter 11 at a timing of each edge of the motor position latch signal 18 and the external input signal 17 in numbers equivalent to the past (m) times, an external signal reading means 16 for reading the on/off state of the external input signal 17 at a constant cycle and for turning on the internal flag of the external input signal 14 when the external input signal is continuously in on-state for a p-cycle, and a detecting position computing means 13 for computing the motor position at a timing when the external input signal 17 is turned on. The detecting position computing means 13 estimates a motor position change amount from when the motor position latch signal is turned on until when the external input signal 17 is turned on. <P>COPYRIGHT: (C)2008,JPO&INPIT |
