# Small Torque motor

Hello, I'm working on a project building a prop that looks like a magic pen writing by itself. I wanted to us a stepper motor (Nema 17) but it is getting way to hot for my liking. What else could I use that has similar size and torque to the Nema 17?

Stepper motors are designed to run hot (80 C is usually OK), but perhaps you have set the current limit higher than need be.

similar size and torque to the Nema 17

NEMA 17 specifies only the size of the face plate. The torque and winding resistance can vary widely between specific models and manufacturers.

I did not know that about the Nema17.
The one I have says the Current rate (A) of 1A
I am using a TB6600 driver but I set it at 2.5A, guess this could be an issue.
I also have the driver set at 32 micro step getting a 6400 pulse, not sure if that would add to the heat?

The manufacturer's rating of 1 Ampere/winding must not be exceeded for normal operation.

It is OK to run the motor at a lower current limit than the rated maximum, and it will run cooler but provide less torque.

The mounting for any stepper motor must act as a heat sink to aid in keeping the motor temperature under control. Are you using something like aluminum to mount the motor?

Thanks for the help, yes I will lower the current and yes I have a heatsink for it.
Are there other motors out there that are small and have a bit of power as well?

Power is always measured in watts for electric motors. Torque is a function of the current part of the watts formulae. Do the math and take your pick of possible motors.

They all do. What you need to do is determine how much power and torque your project actually requires and pick a motor that will do the job.

Here is one place to start: Pololu - Force and torque

power = torque x (shaft rotation rate in radians/sec)