| 摘要 |
In a spindle device 10 of a built-in motor type, a rotary shaft 12 includes a first cylindrical member 71 made of a metal material, and a second cylindrical member 72 made of carbon fiber composite material, disposed on an outer peripheral surface of the first cylindrical member 71 and having an outer peripheral surface on which a rotor 20 is fitted. Therefore, it is possible to suppress the increase in temperature of the rotary shaft or a bearing caused by heat generated from the rotor, and to improve machining precision. |
