| 摘要 |
PURPOSE:To control speed precisely by a simple circuit by detecting the position of a rotor from a current waveform while controlling the angle of lead of the rotor by the detection of the position of the rotor. CONSTITUTION:Resistors R1-R4 detect currents flowing through each coil phi1-phi4 at one phase-four phase. An analog data selector SL selects output voltage from non-inverting amplifiers OP1-OP4 by select signals applied to select-signal applying terminals A, B, C, and controls a transistor Tr5 by a signal from a micro-computer MC and acquires a saturated waveform from an integrating circuit consisting of a resistor R and a capacitor C. A differential amplifier OP5 compares an output from the integrating circuit and an output from the analog data selector SL, and detects a difference between both outputs. A stepping motor is driven by the detecting output. |
