| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent noise generation, resulting from quantization errors, without causing lowering of responsiveness during speed control of a servomotor. <P>SOLUTION: The speed detector has a rotating substrate 27 fixed to the rotating shaft of a servomotor, on which two acceleration sensors 21 and 22 are arranged to detect acceleration in the circumferential direction. The acceleration sensors 21 and 22 are placed point symmetrically with respect to the center of turning substrate 27. Both the acceleration sensors 21 and 22 have a piezoelectric member 28, which output positive signals, when the rotating substrate 27 rotates in the CW direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
