| 摘要 |
PURPOSE:To always maintain the rotating speed of a motor constant even if a load is varied by comparing a speed instruction word with an actual speed word of a motor and correcting the output word of a drive device by the correction word weighted in response to the value. CONSTITUTION:A value set by a keyboard 6 is inputted to an input/output device 7, thereby producing an instruction word 10 and holding it in a memory 9. On the other hand, a pulse from an encoder 3 responsive to the rotating speed of a motor 2 employs a speed word 15 through a counter 4 and a latch register 5, a deviation word 12 is formed together with the word 10 by an arithmetic unit 8, and is compared with the prescribed words 19-21 in the memory 9, thereby selecting the prescribed words 22-24 weighted and corrected. Then, the torque corrected word 16 of the unit 8 is calculated is stored in a memory 17, thereby producing an output word 13, and controlling the motor 2 through the chopper 1. Accordingly, even if the load is varied, the rotating speed of the motor can be maintained constantly by the corrected word at high speed response. |
