![]() * Unipolar stepper motor speed and direction control with Arduino. This motor has 4 coils and they are connected as shown in the figure below: Usually the unipolar stepper motor has 5 wires one for motor supply and the other for coils. In this example I’m going to use the full step two-phase mode for controlling the unipolar stepper motor. There is another controlling type called microstepping, this type is more accurate than the half step mode, it requires two sinusoidal current sources with 90° shift. ![]() it requires power in-between one-phase and two-phase modes, torque is also in-between. This mode increases accuracy by dividing each step by 2. Half step mode is a combination of the two full step modes (one-phase and two-phase). This mode provides the highest torque but it requires twice as much power as one-phase mode. In full step two-phase mode the driver energizes the two coils at the same time. This type of controlling requires the least amount of power but provides the least torque. In full step one-phase mode the driver energizes one coil at a time. The full step can be divided into 2 types: one-phase and two-phase. The popular controlling modes of of the stepper motor are: full step and half step. The other type is the unipolar stepper motor, it is 4-phase brushless motor which has 5 or 6 wires. The bipolar stepper motor is a two-phase brushless motor which has two coils (windings), this motor has 4 wires (2 wires for each coil). Stepper Motor Control with Arduino and Joystickīasically there are two types of stepper motors: bipolar and unipolar. The stepper motor used in this example is 28BYJ-48 which usually comes with its driver board. ![]() Now I’m going to show how to do the same thing with uinpolar stepper motor. In the last Arduino project, I made a simple motor controller which controls the speed and direction of rotation of CD-ROM bipolar stepper motor.
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