I'm making an electric wheelchair . I want to lift a total weight of 100kg on it with a max speed of 4mph. So help me choose appropriate motors(dc geared , stepper, or .....) and batteries (12 or 24 V) for the project. I plan to use two motors driving the back wheels.
My calculations so far:
F=ma + uN = 100x 0.5 +0.04x980 = 90 N approx I used an acceleration of 0.5 max, u=0.04 maximum for the roughest surface possible; I calculated the normal force N using N=mg.
Radius of my tire is 0.15 m.
power = force x velocity(max) = 90 x 4 = 360W
torque= force x radius = 90 x 0.15= 13.5 Nm or take 15 Nm (max).
What should be the current requirements because torque is directly proportional to current and speed to voltage. high rpm decreases the torque...