I'm designing a mobile robot with tracks and skid-steering driving system and I am evaluating whether an electric motor would be better than a hydraulic one.
I did some calculations, the total weight of the robot is 1200Kg, there are two rubebr tracks and their sprocket had a diameter of 0.3 meters. The maximum velocity should not exceed 0.5 m/s and I do not think the robot will have to face slopes greater than 20%.
If I use the hydraulic system, I would go with: - 1 x 12kW AC Motor, 48VAC, 2900 RPM - 2 x Oleodynamic pumps 8.5 cc/rev, 120Bar working pressure - 2 x OMP 250 hydraulic motors - 1 x AC motor controller 300A - 1 x proportional valve controller - 2 x proportional hydraulic valves - 1 x 19kW/h battery pack
If I use the electric solution, I would go with: - 2 x 2500W AC Motor, 48VAC, 2200 RPM - 2 x gearbox 1:35 - 2 x AC motor controllers 300A - 1 x 19kW/h battery pack
If my calculations are correct, the first solution should be easy to maintain while the second one should be easier to implement.
What can you suggest? I usually would go with the second solution, but since it is a big machine, I would like to save some money and keep the system easy to check, maintain and control.