| 摘要 |
PURPOSE:To simplify a fixture significantly, to make a coupling unnecessary and to facilitate assembling work, by a method wherein a magnetic detector is installed on a printed board having a through hole. CONSTITUTION:A printed board 15 has a through hole and is held on a motor body 16. A magnetic disk 14 is coupled with a rotary shaft 2a of the motor penetrating the through hole. The printed board 15 is provided with a pair of Hall ICs 15a, 15b and an abnormal state detector for detecting variation of magnetic flux caused by rotation of the magnetic disk 14. The abnormal state detector discriminates discrepancy between rotation information by two- phase signal and operation command, and detects the abnormal state. |
