LitePlacer.com forums

Hi All, my rotation mottor seems to have issues. Tried the limiting pot on the tinyG with minimal impact, any ideas?

https://youtu.be/y2nMJVPJtAo

Thanks a lot,

Felipe

Please grab a multimeter and measure the resistance in each cable pair?
Also check if the cable pairs have no connectivity to each other with the multimeter.

In general, troubleshooting the motor goes like this:
- Check the pairs: The four fires are two pairs, and we expect to find a few Ohms resistance on a pair and no conductivity from one pair to another.
- Check the wiring. Try to pull out the wires from the screw terminals to ensure a good contact.
- Turn the motor by hand. There should be some resistance, but not much.
- Check the current limiting pot. A motor with no load should turn with almost minimum current. (Current limit at full minimum might be too little.)
- Check if the motor is hot. A motor at standstill put powered on may run warm, but not hot. A failure mode on a stepper motor is a short in the windings, causing melting of insulation, causing more shorts etc, resulting to a hot and non-functional motor.
- If you know how to command TinyG directly, check with another channel to know if it is the motor or the driver.

That said, this looks like a bad motor. It tries to turn, so wiring is most likely correct. (I handle replacement by email.)

i forgot to mention, i checked the coils and resistance and it's good, i can see resistance on each pair and no resistance across pairs. So the coils are not blown at least and there is no short between coils. I also swapped the motor temporarily to the Z channel and got the same exact behavior. So it is not the tinyG controller that is blown which is good news. Swapped the wiring between coils to rule out a wiring issue with no success. Mechanically, the motor moves when you turn the axis, so nothing obvious there either. I guess something is wrong with the motor inside. Any other ideas?

Does anyone knows where to buy this motor in the U.S? that particular configuration seems hard to find. thanks