Hi everyone!
I have a stepper I bought some years ago but I can't find the voltage I can use.
Here is what I know:
Name : 42byg018
Stepper bipolar (four wires)
I can find info on other 42byg models but not on the 018.
Do you the maximum voltage I can use?
Thank you very much!
You could measure the resistance of the windings and try to infer the specs by comparing with others in the series (see http://www.ekt2.com/_files/96%20STEPPER%20MOTOR%20%2042HB202.pdf)
Do you the maximum voltage I can use?
Stepping motors are not rated for voltage but current. Too much current will just cause them to overheat. As they have a big thermal mass you can detect when the motors are getting too hot and turn it off. They take most current when they stand still. So just wire up two coils to a bench supply and increase the voltage until the motor feels quite hot. Allow it to cool and repeat to find the value where the motor is cool enough to keep your finder on it at all times.
Also given information about other motors in the same series (with presumably the same construction) it should be that the power dissipation in the windings will be about the same for all versions. That web site lists at least 3 sizes of motor so choose the ones with the right dimensions, work out the winding power rating (perhaps take the average) and plug that power into P = V^2/R = I^2.R where R is the winding resistance.