| 摘要 |
PROBLEM TO BE SOLVED: To simplify a circuit for detecting a motor rotation angle, and to reduce the cost. SOLUTION: Resistors 14a and 14b are respectively provided on the two power wirings for a DC motor 5. For the normal rotation and the reverse rotation of the DC motor 5, rotation detecting signals (pulses) are respectively taken out from different resistors 14a and 14b, and filtering and amplifying are performed, and a square wave is formed by a waveform rectifier circuit 17. The rotation detecting signals always have the same phase, and therefore, one series of a circuit can cover the filtering and amplifying. COPYRIGHT: (C)2004,JPO&NCIPI
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