I am wondering if I can build an autonomous 4WD rover with approx. velocity of 8…10 m/s (indoor only) to carry e.g. 3kg.
One of the my stupid questions is how to stop it and reverse the direction.
This is for educational purpose.
As for the payload, it all depends on the incline, or the surface. If you go in a straight line it will probably be good but if you try to turn it might not work great (4WD robots are not great for turning on the spot.)
So if you need your robot to be more agile, you might want to consider a 2WD Mobile plateform robot.
I hope this gives you some Ideas for your project.
Already did it - be sure, however, I still have the same availability and related questions.
Hope you already have the right answers and/or right experience, so - slower:
Input (as an example): velocity = 8 m/s, acceleration = 4 m/s2, total mass = 5 kg, 4wd/4 motors, indoor/max incline = 0.
My stupid questions:
… Recommended motors for HIGH speed …
What I usually see is " With its integrated reduction box, it is specially designed to operate at low speed." as e.g. for GHM-12 and GHM-13 found around the a4wd1 chassis description.
Then:
… Do I have to think about a kind of brakes for a 5 kg 4wd rover …
… Wheels type & diameter recommended where it makes sense …
… What else is critical for the design…
Sure that the correct answers and examples will be of use not only for me!
Thanks in advance!
In your case: (1500 * 3.1415 * .12) = 9.42 m/s, so you need a motor that can do around 1500 rpm + has a lot of torque ( probably around 1.5Nm or more) which is not a common motor we have in stock.
You will probably need to find high speed motor with a gear box to get to the desired speed/force configuration. What you are looking for is more in the realm of Brushless DC RC cars. You might be able to find
one on the RC market and adapt it to your application. (30km/h is extremely fast for indoor, are you sure this is what you want ?)
… Do I have to think about a kind of brakes for a 5 kg 4wd rover … : If you plan to go a 30km/h with 5kg, indoor, yes it might be a good idea.
… What else is critical for the design… High speed, high torque will mean high current. Motor controller and battery choice will be critical.
This is in line with my own thoughts!
Do you have a good example of a RC car of 4…5 kg with a good enough BLDC, gear box and brakes?
Still trying to re-use the kit(s) - if available.