| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a rotation state detector capable of restraining an influence of a high-frequency noise to detect accurately a rotational condition of a direct current motor, in particular, a rotation speed thereof. <P>SOLUTION: This rotation state detector for detecting the rotational condition of the direct current motor, using a rotation pulse indicating the rotation speed of the direct current motor, out of detection pulses P output in response to rotation of the direct current motor, is provided with: a period measuring means 1 for measuring a period of the detection pulses P; a period determination means 2 for determining that the detection pulse P is the rotation pulse or a divided pulse of the rotation pulse, based on a period difference between a period of the last rotation pulse and the period of the detection pulse P; and a correction means 3 for making a sum-up period summed up with periods of the plurality of consecutive divided pulses serve as the period of the detection pulse P when the detection pulse P is the divided pulse, and for integrating the divided pulses to one rotation pulse. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
