Need help with speed control of 12vdc PM motor

[engineeredgarden]

I am working on a project that requires very low torque and slow speed of a shaft, and would like to use a 12vdc PM motor to do it with. A cordless drill motor seems just the thing for it, but even when using the onboard speed control of the drill itself (I think a transistor and something inside the trigger mechanism) it's still way too fast. I've tried different resistors in series with the voltage supply with no luck, and wondered if there was a simple homemade solution to this problem. Any thoughts?

 

[rob_croxford]

look up PWM motor control. there are countless threads on this site that address the problem

 

[engineeredgarden]

Oh, ok....i'll do that. Thanks!

 

[rob_croxford]

https://www.electronicspoint.com/24v-dc-motor-driver-t227280.html

Here ive found this one which is quite recent but there should be more