Im starting a new project where i want be able to produce mechanical resistance to a rotating shaft, im currently thinking that the best way to do this is to connect a bushed dc motor to the end of the shaft and then use a series of power resistors to burn off the energy it creates.
Does anyone have any experience of doing this? Ive been searching around online but i just fine articles about the resistance of motor windings
I also want to be able to change the torque that this motor applies by changing its resistance quickly, i guess i could do this with a series of mosfets?
Torque depends on current so a programmable constant-current load circuit would fit the bill nicely, except at low speed when there wouldn't be enough voltage to activate the circuit.
Switchable load resistors is nice and simple though, but will have torque depending on speed being just a resistance, however that's often a benign behaviour.
