| 摘要 |
PURPOSE: To make an overcurrent protective system in such a structure that a drive equipment of a stepping motor may be returned to the operating condition when the stepping motor is restored to the normal condition, in the overcurrent protective system which is built in the drive equipment, etc., of the stepping motor and works well to prevent overcurrent. CONSTITUTION: FET44-1 -44-4 which supply current to a stepping motor 10, detection resistors 30, 32 which detect overcurrent, and transistors 36, 38 are installed. Collector terminals of the transistors 36, 38 are connected to an abnormality detecting line 33 which is connected to gates of the FET 44-1 -44-4 . The abnormality detecting line 33 is connected to input terminals of a capacitor 66, a resistor 68, and an inverter 64. PA-0 , PA<-1> , PB-0 and PB-1 ports of a CPU 60 are connected to output terminals of the inverter 64 through base terminals of transistors 52-4 52-4 and diodes 62-1 -62-4 . |
