It is commonly used in photocopy machines printers cnc machines robotics etc where precision motion steps and controls are needed.

Stepper motor schematic.

A unipolar stepper motor must be driven in unipolar mode. The step motors are mostly two phase motors. In the designs where the common of two poles are separate but centre tapped motor have six leads. If the centre taps of the two poles are internally short the motor has five leads. The frequency of clock generation in this case cannot be kept constant so we need to get variable speed for the stepper motor. In unipolar step motor there are two winding per phase.

Stepper motor is an impressive piece of engineering. The figure shows the circuit diagram of two stage stepper motor driver. Accelstepper stepper accelstepper motorinterfacetype steppin dirpin. A bipolar stepper motor must be driven in. Basically stepper motors are classified in to unipolar stepper motors and bipolar stepper motors based on the windings of the stator. It is a unipolar type stepper motor with 5 wire configuration.

A stepper motor can operate in many modes like full step wave drive or half stepping please refer the article on stepper motor for the sequence of steps. And hence this stepper motor driver circuit is essentially a binary counter circuit. Hence we must make the driver interactive enough to be able to take command from the user and do the required kind of stepping. The following image shows a bipolar stepper motor with its winding. Eight lead unipolar facilitates both series and. Stepper motors fall into 3 main categories namely unipolar bipolar or hybrid unipolar bipolar.

The unipolar motor so have five six or eight leads. Now as shown in the circuit diagram the 555 circuit here is to generate clock or the square wave. Void setup set the maximum speed in steps per second. Step the motor with a constant speed as set by setspeed. Instead of making full turns like a normal motor stepper motor make steps one small degree at a time. Define dirpin 2 define steppin 3 define motorinterfacetype 1 create a new instance of the accelstepper class.

Motor interface type must be set to 1 when using a driver. Stepper motor driver circuit diagram and explanation. Void loop set the speed in steps per second. A 12v stepper motor is used in this project.