| 摘要 |
PURPOSE:To improve the positioning accuracy by a motor by correcting the difference of load through selecting the amplification factor according to the direction of rotation. CONSTITUTION:A signal SL is outputted from a four-piece photodiode 12 having received a laser beam from the laser diode 11 of an elevator part 9. Then, a signal SP obtained from said signal SL is outputted to a driving-direction decider part 4. Said driving-direction decider part 4 computes the voltage difference V between a voltage V shown by the signal SP and a set voltage VO. Then, a signal SV is outputted from the driving-direction decider part 4 according to said voltage difference V. An amplification-factor switching part 5 selects the amplification factor according to the polarity of said signal SV and outputs a driving signal SA to a motor-driving part 6. In this manner, a motor can be driven with a high accuracy. |
