| 摘要 |
PURPOSE:To use a CPU having small number of bits by cutting data out in a range of a predetermined bit length from a most significant bit detected by decision means based on rotational speed detection data and rotational speed command. CONSTITUTION:Assume that a motor 1 is rotated to output a rotational speed detection signal Sd from a rotary encoder 3, and a rotational speed command signal Sc is given therewith. Then, information in which the most significant bit of rotational speed detection data Dd from decision means 4 and rotational speed command data Dc has k digits is applied to data slicing means 8. Then, the means 8 feeds 4-bit data of k digits - (k-3) digits, and outputs approximate data Ddd, Dcc to calculating means 11. Accordingly, the means 11 calculates based on the 4-bit data Ddd, Dcc to control a drive circuit 2. |
