Abstract
Series control and parallel control are two modes of controlling step motors by single chip microcomputer. The design adopts serial control mode, in this case there are only two controlling lines between the single chip microcomputer system and the driver of the step motor .One is used to give out clock pulse to control the velocity, another is used to give out directional signal to control the direction. The two signals are all sent to the input of the driver of the step motor, which includes the ring dividing driver .Because of this, the system has a very simple structure. According to the demand of controlling speed, the system give out corresponding clock pulse to control the speed of the motor through the clock pulse. when constant speed is needed, constant clock pulse is gave out; when adding speed is needed, adding clock pulse is gave out; when reducing speed is needed, reducing clock pulse is gave out; When the lock-in state is needed, direct current is needed instead of the pulse. so the speed control of the step motor is very easy. The direction control line is used to control the direction of the step motor. when the voltage is “1”, the ring dividing driver shares the pulses according to the right direction, the step motor runs in the right direction. When the voltage is “0”, the ring dividing driver shares the pulses according to the revert direction, the step motor runs in revert direction.
Keywords: Single chip microcomputer system; Control; Step motor; Ring distributing driver