| 摘要 |
<p>A technique for smoothly speed-controlling a speed of a motor whose time constant is relatively small, such as a supersonic motor, under a relatively rough speed control profile and a simple configuration is disclosed. According to this technique, a frequency division number calculating section 1 changes a division number A under the relatively rough speed control profile and sets for a frequency division number setting register 2. The comparator 3 outputs a + count signal if the division number A set by the frequency division number calculating section is greater than a current division number B counted by a frequency division number counter 4 (the division number A > the division number B), and outputs a - count signal if the division number A < the division number B. The frequency division number counter performs a + count on an enable clock of a time width t, which is shorter than the speed control profile of the frequency division number calculating section, if the + count signal is applied from the comparator, and performs a - count if the - count signal is applied from the comparator, and consequently counts the current division number B of a frequency divider 5 and applies this to the frequency divider.</p> |
