| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem wherein a locking mechanism which position-controls a servo motor using a rotation position signal of a rotary encoder, and fixes the door position of an automatic door apparatus, requires a space for accommodating the rotary encoder, and is not preferable for miniaturizing the automatic door apparatus, moreover, increases the cost due to the rotary encoder, etc.SOLUTION: The locking mechanism of the automatic door apparatus consists of a brushless motor with a position detecting means, for obtaining a detection signal as a plurality of sine waves directly from a main magnetic pole of a driving magnet, using a plurality of Hall elements which are inherent to the brushless motor, a position signal detecting means, and a control means with a position control servo. Thereby, a rotational position detector, such as the rotary encoder and a resolver, is eliminated. |
