| 摘要 |
PURPOSE:To improve wow flutter value by making a plurality of elongated holes or holes in a rotor section with same pitch and securing to a shaft holding section with screws at an arbitrary angular position through the holes. CONSTITUTION:A rotor section 7 is provided with elongated holes 5 at three points with same pitch and fastened to a rotor fixing base 15 at a shaft holding section 24 by means of screws 6. When the fixing phase is shifted between the shaft holding section 24 and the rotor section 7, the screw is loosened and the phase between a shaft 15 and an FG magnet 3 can be shifted within the range of the elongated holes 5 at three points. Furthermore, since the elongated holes 5 are arranged at same pitch, the phase can be shifted by 120 deg. if the elongated holes or holes are provided at three points. The reason of providing a plurality of holes is to make possible to fasten the shaft holding section 24 and the rotor section through the screws 6 and to shift the fixing phase considerably and fine adjustment can be realized through the elongated holes. According to the constitution, the rotor section can be secured, through screws, at a position exhibiting best characteristic while measuring wow flutter characteristic. |
