Need Help!- Motor Help

[synslash]

I got a few stepper motors from ebay a while back really cheap but unfortunately have no info other than whats printed on them nor can i find anything else other than they were originally part of some sort of actuator. They have 1.3ohm coils, so I guess if I had the rated voltage I could find out what kind of current these things are supposed to handle.

Is that a particular voltage motors of this size tend to be rated for without a chopper?

Also how hot would be hot for these, I can run them for 10 minutes with the current limiting set to about 1A and they are well within touching temperature.

I'll include a couple of photos of one of the motors, Thanks for any help.

[amishx64]

Sadly, with out solid information, such as PSU voltage, or stepper driver, everything must be rule of thumb. This motor is not 'rated' in the sense of the word for anything. All it gives you is the coil resistance- 1.3 Ohms.

First of all, you never want to get your motors to the point where they can melt plastic or severely burn you. You may need to do some close-monitoring to determine how many volts (and consequently amps) you can run these at before things start to get dangerous.

Lets draw some guidelines:

You have a 1.3 coil resistance motor.
Ohm's Law: Volts (V) = Current (I) * Resistance (R, Ohms)

You tested at 1 amp. That means you used a 1.3 Volt supply (or at least you theoretically did) since 1 * 1.3 = 1.3V

Without a chopper, I would say a good rule of thumb for your motors would be around 2.5 Amps. You need to test this to make sure they don't catch on fire or overheat. - Don't just take my word for it! I don't have one of these motors.

With 2.5A and 1.3 Ohms, that gives you a grand 3.25V. Not very high.

I would definitely use a chopper board. The higher voltage you can get, the better torque and speed. With a chopper, you can use a lot higher voltage.

P.S. Don't go around testing these motors with 12, or 24 volts and no current limit. You will destroy you little motors.

Anyone please feel free to add to or correct me on anything.