It is a 6wd rover with rocker suspension (Rocker-Bogie).
I did not like the skid steering from my last rover so this one can turn the front and rear wheels.
The last rover i built had no bearings so it was kind flimsy. So this one has bearings on all joints.
This page will be a work log for the build, think it will take pretty long time to complete...
I want to make a more thoughtful design this time so I tried FreeCad.
It was pretty simple to learn the basic functionality so i use it to design the chassi.
It is not a construction drawing, just a sketch so i can figure out where stuff should be...
Above is the front wheel arm.
On my last rover the wheel was directly fixed to the motor and it could not handle the load. And because it stuck out so much it stuck in stuff.
I have change the motor placement, will have larger wheels and fit the motor inside the wheel.
The front and the back wheels will have servos to control steering.
The middle wheels will not have an steering.
The 4 front wheel will have the rocker functionality and the 2 back wheel can move up and down separately.
A lot of the parts is on its way from china now...
And a lot more....
The DC-motors i use is GR12 12V DC 99.5-1 ratio Planetary Gearmotor
This will be the most expensive part of the project ... £45.60 peice :-(
But if the motors is as good as the specifications say then it will be worth it.
I have change the construction of the wheels, the motors will be inside the hub of the wheel.
And the wheels will be much bigger. On one side (outside) of the hub the motor is fitted and on the other side a shaft with bearing.
Connect all the stuff.
All electronics on this rover should have Hybrid Common Choke.
The Hybrid Common Choke i designed is probably totally overkill... they have both a common mode choke, differential mode choke and a lot of capacitors.
I designed three different types with the same base layout and components.
My Hybrid Common Choke factory :-)
I have tested them with my small oscilloscope (DSO Nano) when i drive a DC-motor and they seem to work but someone who is better than me on electronic might have a different opinion :-)
Without the filter i get a lot of nose and when i add the filter much less nose, but a simple LC-filter might work just as well.
The three different types have the same base design but with various components to handle different loads and other stuff...
I made my own power distribution board. Two screw terminals for power in and one for main power on/off.
It has 3.3V 5V and one more voltage...do not know what i will use it for now...
In the PCB layout bellow i do not have any PTC fuse on the buck converters, but i have add a PTC that hold 1.85A and trip at 3.7A on 3.3V, 5V and xV.
If you want more information on how tot do this...