| 摘要 |
PURPOSE:To simplify the configuration of a driving mechanism section by extracting a pulsating component generated upon the rotation of a motor, and discriminating whether the motor is rotated. CONSTITUTION:When a motor 22 is driven, a pulsating component is generated in a driving current by brushes and a commutator. The pulsating component is applied through a current/voltage converter 27, a high pass filter 28 and a diode 29 to an integrator 32. An operational amplifier 33 compares an input voltage V1 from the integrator 32 with a reference voltage Vf from a reference voltage source 34, and outputs a signal for stopping the power energization of the motor 22 by a driver 25 when the voltage V1 becomes smaller than the voltage Vf. Thus, it is not necessary to provide a limit switch in a driving mechanism section. |
