Is it possible to use a DC motor as a generator to regulate applied mechanical torque? A hypothetical situation:
I have a DC motor acting as a generator attached to the ceiling. The motor shaft has a pulley with a cord wound round it. The free end of the cord is attached to a weight. How can I regulate the speed at which the weight will fall to the floor? How can I adjust the system for differing weights?
My initial thoughts are that I could simply attach a potentiometer across the leads of the motor. Varying resistance will limit the output current of the generator and thus limit the speed at which it unwinds. Is there anything wrong with this assumption?
Thanks in advance!