I’m trying to make a prototype star tracker and hooked together the following stepper and controller. But the motor doesn’t spin, it just chatters and rattles. The motor is a Nema 17 2 phase four wire 0.4A 12V. The controller a generic board. I’ve double checked the wiring and can find no fault. Has anyone any idea what might be wrong?
Hey, @Richard51573. Thanks for bringing your question to the forum.
Here are all the questions I can think to ask at the moment
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Are you supplying 12-24V at the correct motor power supply inputs?
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Under the circumstances you’ve described, does the motor have any holding-torque? Are you able to turn the shaft by hand when everything is powered?
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Are you controlling by the manual control-keys or a pot?
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What are the status LEDs doing?
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What happens when you connect a potentiometer to the relevant input?
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Try running a simple DC motor on channel A then again on channel B. What do you observe?
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Does your stepper motor work? Try manually energising the coils in sequence to get it to rotate some continuous arc.
Would you mind uploading a photo of your own setup? I know it’s a simple arrangement, but a picture can be really helpful.
Thanks for the reply Michael. I eventually found the problem, the motor has
a six pin plug. Coil A uses pins one and four. Coil B uses pins three and
six. I had expected 1&3, 4&6.
Regards,
Richard.
Isn’t that just the way of things! Glad you found it in the end
Always check the obvious first
Serves me right for buying ‘too cheap’ from china - no wiring diagram and hard to find anything to help on the www.
This project is s prototype for a star tracker for my camera. If it shows promise I will make a much more precise tracker with quality products from Core Electronics. If anyone on the forum has a reliable way to locate the South Celestial Pole please share your knowledge. I am hoping a template with the Southern Cross together with the two pointers can be used in a similar manner to the simple bomb sight used by the Dam Busters will do a reasonable job.
Richard.