Hello,
I am conducting a research experiment where I need to control overground running speed. To do this individuals will follow a marker on a string that is pulled across the laboratory. I am using a small electric motor (1.5-3V) connected to a tamiya gear box (too get the rpm low enough) that spins a pulley pulling a string across the lab. I am using an Enercel switchable ac power adapter with a 1k ohm multi-turn potentionmeter to control the voltage. However, this set up is not sensitive enough, i.e. I need to be able to have ~10rpm changes in motor speed and currently I'm getting ~100rpm per 0.1V and it is very difficult to control 0.1V increments.
I have also used a 25 ohm single turn potentiometer and had the same problem. I also have a large knob on the potentiometer to try to make voltage adjustments easier.
Does anyone have any possible suggestions? I would like to keep this relatively inexpensive, but would definitely consider a complete redesign.
Thank you for your help!
Missy Thompson
Department of Neuroscience
University of Idaho
I am conducting a research experiment where I need to control overground running speed. To do this individuals will follow a marker on a string that is pulled across the laboratory. I am using a small electric motor (1.5-3V) connected to a tamiya gear box (too get the rpm low enough) that spins a pulley pulling a string across the lab. I am using an Enercel switchable ac power adapter with a 1k ohm multi-turn potentionmeter to control the voltage. However, this set up is not sensitive enough, i.e. I need to be able to have ~10rpm changes in motor speed and currently I'm getting ~100rpm per 0.1V and it is very difficult to control 0.1V increments.
I have also used a 25 ohm single turn potentiometer and had the same problem. I also have a large knob on the potentiometer to try to make voltage adjustments easier.
Does anyone have any possible suggestions? I would like to keep this relatively inexpensive, but would definitely consider a complete redesign.
Thank you for your help!
Missy Thompson
Department of Neuroscience
University of Idaho