| 摘要 |
PURPOSE:To reduce in diameter and thickness and to decrease the jitter, of a rotating speed by forming a small gap between a rotor permanent magnet and a stator yoke, and mounting a printed sheet formed with a printed coil in the gap. CONSTITUTION:A rotor 50 is composed of a bracket 14 secured to a rotary shaft 12, a rotor yoke 16 secured to the bracket 14, and a rotor permanent magnet 52 secured to the yoke 16. A gap between the magnet 52 and a stator yoke 56 is approx. 0.3mm. The yoke 56 is so attached as to be buried in a base 54, and a plated through-hole both-side printed sheet 58 copper-lined adheres to a polyimide film base material on the base 54. A printed coil pattern and a driving circuit are provided on the both-side printed sheet 58. |
