I'm new to electronics and this is my first post so please be patient with me.
I am required to design a rehabilitative exoskeleton-like knee-brace to assist sit to stand, I have faced a number of uncertainties due to lack of understandings of the working principles of a motor. This exoskeleton should exert minimal torque to assist the user to rise from sitting
As a rehabilitative device, the output speed of this motor is required to be constant and from what I understand, holding the Voltage input to the motor constant will achieve that. The motor needs to have a controllable output torque, and I can control torque by controlling the armature current.
In theory, with a buck converter, I am able to hold the input voltage to the motor constant. This would be able to hold the RPM constant but leaves the torque uncontrollable. However this would only leave one output parameter to be variable
I have also thought of connecting the buck converter to a DC motor driver as I understand that the buck converter can only control either Voltage or Current and not both simultaneously, the DC motor driver should help keep the RPM constant with a varying Voltage input while the buck converter would help to vary the Torque with a controllable Current output
Would this be a feasible idea or are my principles extremely wrong, I would like to seek advice before sourcing for parts. I hope no one feels that I am asking to be spoon-fed, as I am only asking for advice