steppernxtvc
Differences
This shows you the differences between two versions of the page.
| Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
| steppernxtvc [2017/08/15 20:15] – [Reference Tutorials / Video Demos] rebeccacao | steppernxtvc [2017/08/15 20:37] (current) – [About Stepper Motor] rebeccacao | ||
|---|---|---|---|
| Line 1: | Line 1: | ||
| - | ====== | + | ====== Stepper Motor Theory and Direction/ |
| **Author:** Xinke (Rebecca) Cao | **Author:** Xinke (Rebecca) Cao | ||
| Line 36: | Line 36: | ||
| \\ | \\ | ||
| ==== About Stepper Motor ==== | ==== About Stepper Motor ==== | ||
| + | **General Knowledge** | ||
| + | \\ | ||
| + | Stepper motor can be split into three categories: unipolar, bipolar, or hybrid. In a unipolar stepper motor, there are wires called **central tap wires** to allow the motor to switch directions without having to switch the direction of the current. Therefore, in a 5-lead stepper motor, 4 wires are used to control the stepping and 1 wire is the central tap; in a 6-lead stepper motor, 4 wires are used to control the stepping and 2 wires are the central tap. Having the advantage of not having to switch the direction of the current for an unipolar stepper motor, one can just control the sequence of the stepping instead of having to use a H-bridge to control the current as well. | ||
| + | \\ | ||
| + | The bipolar stepper motors requires a switch of the direction of current; therefore, as mentioned before, one need an H-bridge to control a bipolar stepper motor as explained [[https:// | ||
| + | |||
| **Mechanical Parts** | **Mechanical Parts** | ||
| \\ | \\ | ||
| Line 50: | Line 56: | ||
| \\ | \\ | ||
| The other wires has to be raised to a higher potential in a certain sequence to move the stepper motor. For example, for full-step drive, you have to raise both yellow & orange at the same time; then, you raise orange & blue at the same time; then, you raise blue & pink at the same time; finally, you raise pink & yellow at the same time. If you repeat the sequence, the motor is going to keep on moving. If you use the sequence backwards, the motor is going to move in the opposite direction. In addition, how fast these sequences are fired will determine the speed at which the stepper motor moves. | The other wires has to be raised to a higher potential in a certain sequence to move the stepper motor. For example, for full-step drive, you have to raise both yellow & orange at the same time; then, you raise orange & blue at the same time; then, you raise blue & pink at the same time; finally, you raise pink & yellow at the same time. If you repeat the sequence, the motor is going to keep on moving. If you use the sequence backwards, the motor is going to move in the opposite direction. In addition, how fast these sequences are fired will determine the speed at which the stepper motor moves. | ||
| + | \\ | ||
| + | \\ | ||
| + | **Finding the Central Tap Wire for a Unipolar Stepper Motor** | ||
| + | \\ | ||
| + | Using a ohmmeter, with one terminal of the ohmmeter on one lead of the stepper motor, another terminal of the ohmmeter on another lead of the stepper motor, measure the resistance between all pairs of wires. Then, when you find a wire that will cause the resistance between pairs of wires to read about a half of a resistance between other pairs of wires, you've found the central tap wire. | ||
| \\ | \\ | ||
| \\ | \\ | ||
| Line 207: | Line 218: | ||
| ==== Final Words ==== | ==== Final Words ==== | ||
| + | In summary, one can control it used the " | ||
| + | \\ | ||
| If you have any questions, please contact me at caox1@unlv.nevada.edu. | If you have any questions, please contact me at caox1@unlv.nevada.edu. | ||
steppernxtvc.1502853321.txt.gz · Last modified: 2017/08/15 20:15 by rebeccacao