| 摘要 |
PURPOSE:To improve the cost and the reliability of a servo motor by associating an oscillator, a pulse width modulator and switching unit in the same circuit and simplifying the circuit configurations of a speed detector and a discriminator with a CPU. CONSTITUTION:An oscillator, a pulse width modulator, a switching and the like are performed in one circuit 10, and a speed detector, a discriminator are performed with a CPU20, thereby controlling a motor M. The circuit 10 has a full- bridge switching circuit made of transistors Tr1-Tr6, a comparator IC1 which detects the current via a resistor R1 and compares it with a current control signal, and AND circuits IC2, IC3 which produce normal and reverse rotation signals, thereby performing the oscillation, modulation and switching by utilizing the counterelectromotive force with the inductance of a motor M. Accordingly, the cost can be reduced by associating effectively in the same circuit 10 and the reliability and efficiency can be improved. |
