| 摘要 |
PURPOSE:To obtain a highly accurate speed detection signal by subjecting a signal detected and synthesized by means of a speed detector to frequency division by a factor of (m.n). CONSTITUTION:A speed detector 3 detects driving signals for m-phases(m is a natural number equal to or larger than the number of phases of motor) among a plurality of phases of driving signal for motor and then synthesizes the m- phase signals thus detected. A frequency divider 5 then divides the frequency of a signal (g) detected and synthesized by the speed detector 3 by a factor of (m.m) (n is a natural number). Consequently, the frequency divider 5 functions to remove speed difference (ef) being generated at a period equal to (m) periods. This constitution provides a highly accurate speed detection signal. |
