| 摘要 |
PURPOSE:To perform a delicate speed control at the time of a low speed without placing a new special-purposed A/D converter and to obtain a sufficient speed accuracy in a practical range such as a low speed, a medium speed, etc. CONSTITUTION:A CPU 2 is so connected that an input speed command analog voltage is input to four A/D converters 2a-2d in the CPU 2 through amplifiers 1a-1d. The amplifiers 1a-1d convert voltage levels corresponding to rotating speeds of motors thereof to input dynamic ranges of A/D converters 2a-2d. The CPU selects digital outputs A/D-converted by the converters 2a-2d based on the speed command analog voltage. |
