| 摘要 |
PURPOSE:To stabilize the rotation of a turntable by arranging a bearing at the lenthwise intermediate part of a spindle and by fitting the spindle with the turntable at one side of the bearing and with a rotor at the other. CONSTITUTION:Spindle 2 arranged horizontally is supported by bearing 8 at its lengthwise intermediate part. The taper part formed at one end of spindle 2 is equipped with turntable 6, which is screwed by bolt 7a; and at the other end of spindle 2, discoid yoke 4 is fitted at right angles to the axial line of spindle 2. On one flank of yoke 4, annular permanent magnet 3 is fitted and on the other flank, multipole permanent magnet 16 for speed detection is fitted. On the flank side of the other end of spindle 2, yoke 9 is fitted by screw 18 to the flank of post 10 fixed perpendicular to holder 20 and on the internal flank of yoke 9, coils 12a, 12b and 12c for forming the magnetic path of permanent magnet 3 are fitted to form thrust- directional bearing part 17. |
