| 摘要 |
<p>Displacement data of axial position targets (20) measured by axial displacement sensors (14) is transmitted to a first main spindle elongation computation section (64), which then computes elongation of a main spindle (15) between the axial position targets (20). The computation result is transmitted to a second main spindle elongation computation section (65), which then computes elongation of the main spindle (15) between one of the axial position targets provided on the side of a tool (22) and the tool (22). The computation result is transmitted to an axial position control section (66). The axial position control section (66) changes the power to be supplied to axial magnetic bearing parts (6), thereby controlling the axial position of the main spindle (15) so that the axial position of the tool (22) becomes constant.</p> |
