How to create motor or generator resistance system for exercise machine?
Researching a method to use resistance from a motor or generator for an exercise machine. There is an axle from which both foot and arm levers extend, so there is rotation, but only about a half turn in each direction, so very low speed, and back and forth. I have used magnets and eddy current and flywheel from exercise bikes, geared up with a belt. This works ok, but does not provide enough resitance even when magnets are adjusted very close to flywheel (due to low speed of rotation). I hope to find something already built and available for a similar application, but can locate parts and build it if I understand how. Resistance must be variable from low to very strong and controllable so user can adjust it. I have DC motor, and shorting the cord greatly increases the drag, but how do I vary/control it? Would adding resistance between the wires in the cord increase drag and make it harder to turn? I have experimented with this and it does not seem to have an impact. Thanks for your help.