| 摘要 |
<P>PROBLEM TO BE SOLVED: To detect an excitation phase shift based on motor behavior to correct the excitation phase shift. <P>SOLUTION: A transmission mechanism 3 has a manual lever 3a switched between a parking position and a non-parking position. The manual lever 3a is driven by an SR type motor 12. A rotational position of the motor 12 is detected by an encoder 13. A control device 11 counts a signal from the encoder 13 to compute a count value N indicating a position of a rotor. The control device 11 selects an excitation phase based on the count value N to drive the motor 12. The control device 11 detects the excitation phase shift based on a speed for switching between the parking position and the non-parking position to determine a direction of the excitation phase shift. The control device 11 corrects the detected excitation phase shift. The excitation phase shift can be detected and corrected without depending only on initialization processing including excitation phase learning processing and wall abutment processing. <P>COPYRIGHT: (C)2012,JPO&INPIT |
