This is the stepper motor and drive used in this kit and it is a Unipolar Stepper. We live in a wondrous age: a few years ago a stepper motor and driver board would have set you back $20-$60 USD due to the miracle of mass-production these can be picked up on E-Bay for around $3 each. However, with the small 5V stepper motor used in this project, we will be able to get away with supplying the motor current from the Arduino as well as the logic signals. The Arduino would then provide the logic and the driver board the “umph!”. ![]() We would use an Arduino to supply the control signals to a driver board that would have a separate motor power supply input. Large stepper motors, like those used in our 3D printers, draw a few amps of current through their windings so an Arduino alone could not run them. ![]() It can even be set to brake (no movement). The Bipolar motor has a simpler coil design but much more complex electronics because the pairs of coils must reverse polarity in sequence to achieve rotation.ĭepending on how the windings of a stepper motor are driven, it can take either half or full steps. ![]() Unipolar has a center-tapped pair of coils that is generally connected to the positive supply (thus, one pole) while the ends of the coils are grounded in sequence to move a armature relative to a hub with North/South alternating magnetized spots. There are 2 main types: Unipolar and Bipolar. A stepper motor can also be called a ‘digital motor’ in that a precise sequence of bytes can move the shaft to a predictable and repeatable position (if a home position sensor has been employed).
0 Comments
Leave a Reply. |