Novel Index Mode Control Scheme and Circuit for Driving Stepper Motor

This paper presents a logic control scheme and its implementing circuit that can carry out precise and convenient control of the stepper motor current. The logic control scheme can complete the control of the stepper motor's speed, steering and step length by using only four control inputs. Based on the mode selection, a variety of subdivision driving modes such as full step, half step, 1/4 step, 1/8 step, 1/16 step, 1/32 step can be realized, which greatly reduces the number and simplifies complexity of external control signals. It is verified by simulations that the control scheme is able to provide accurate current control signals for driving stepper motors.