| 摘要 |
<P>PROBLEM TO BE SOLVED: To overcome the problem that the number of component items and a cost increase if a noise shield and an electronic circuit filter are added so as to prevent a malfunction due to a noise applied from the outside to an apparatus. <P>SOLUTION: A motor controller has a first FG pattern 301 for generating a first induction voltage associated with a rotation of a rotor in a motor, a second FG pattern 302 for generating a second induction voltage due to the noise, a differential amplifier 303 for inputting and differentially amplifying the first and second induction voltages, the output of the differential amplifier 303, and a motor speed controlling block 216 for controlling the rotation of the motor so as to be synchronized with a predetermined frequency signal. <P>COPYRIGHT: (C)2007,JPO&INPIT |
