| 摘要 |
PURPOSE:To obtain a numerical controller of a machine tool, etc., which is simple in constitution, inexpensive, and high in reliability, by providing a single driving device which can drive plural shafts respectively controlling plural motors. CONSTITUTION:A driving device 11 is equipped with driving circuits of two shafts for driving motors 3 and 5. The driving device 11 is also provided with a common cooling radiation fin 11a which operates in accordance with the load variation of the motors 3 and 5 and reference triangle wave outputting device 11b which controls the speed of the motors 3 and 5. When an overloaded condition occurs in either one of the motors 3 and 5, the cooling fin 11a operates and, at the same time, a triangle wave outputted by the reference triangle wave outputting device 11b is compared with a control signal at a pulse width modulating circuit, and thus, the revolving speed of the motors 3 and 5 is controlled. |
