Hey fellas, I am currently modding an old cnc mill but as I dont have the specs for the stepper motors, I am having to guess the Voltage and Amps to use however I did find out that they use to run at 27V.
I am running them at 20V and using two 10W 15R in parallel making an equivalent 20W 7.5R on the common wire, oh yeah, the motors are unipolar (6 wires, with both common shunted as in the diagram). The motors are quite big (about 100mm or 3.94inches in diameter and height)
The problem I am having is that the resistance gets baking hot!
I need to know what resistance I should place in between the common wire and the source and more or less what Amps I should be using.
I doubt anyone will be able to help me with such little information but any info is very welcome. By the way, the driver is custom and Im using EMC2
Regards,
Daz