| 摘要 |
PURPOSE:To provide a driver in which the driving frequency of an oscillatory motor is set appropriately through a simple structure. CONSTITUTION:Rotational speed of a motor 110 is detected through a rotational speed detector 106 and delivered to a microcomputor 100 for controlling the motor 110. Output from a VCO voltage oscillator 102 is branched into two and one of them is input to an amplifier 104 while the other is inputted to a phase shifter 103. The phase shifter 103 shifts the input signal by +90 deg. or -90 deg. depending on the rotational direction of the motor 110 and thus shifted signal is delivered to an amplifier 105. The amplifiers 104, 105 amplify the input signal to produce an output optimal for driving the motor 110. |
