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Originally Posted by student1616
they are just protection diodes,to avoid back emf to the controller.
in my search i found out that bi-polar are much better than unipolar.imean they give much torque.and any motor with 6 or 4 wires can be used as bi-polar.so i think in shld give it a try.
probably i'll try this circuit with bi-polar stetting.
http://en.wikibooks.org/wiki/Practic...Stepper_Motors |
If you want both speed and torque you need both a high current low voltage supply AND a high voltage medium current supply. You switch between them based on the current in the windings. The diodes need to be considerably more robust than a 1N914 or 1N4148. They need to withstand large voltage and currents. You are clearly short a few cards on your understanding of motors and switching circuits. Bipolar motors do provide more torque but the circuit design issues are similar. I would spend some time with the unipolar flavor before moving on.
You also need to learn how to write a sentence with a capital letter at the beginning. Makes your stuff easier to read.
12th March 2008, 02:53 PM
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