The robot has to travel to all those four points within 150 seconds. There is a prize for the fastest robot.
The robot would not make it under 150 seconds if the engines would be running with 6 V.
To power the two motors we have 4 AA batteries, 1,2 V Ni-MH. Which gives 4,8 V.
I did some tests on the motors today. I got a little surprised of how little heat there was. I ran the motor with 20 V without problems.
With 20 Volts, running for 5 minutes:
The motor was not too hot to hold with my fingers. According to my multimeter the temperature was 55 Celsius. Running with a tire without putting any pressure on the tire, it was 0,7 A. When I slowed down the speed as much as I could with some pliers directly on the motor, it was about 0,5 A.
With 6-8 Volts I was able to brake the motor to stand still, the current went up to 0,79 A in that case.
How does the servo affect the motor? I didn't notice before I did my tests that the motors had servo. Does the servo make the motor create as much heat as it would without it?
What should the maximum output of the dc/dc convertor be? The motors are quite strong, so there is no chance that the robot would ever need more current than 0,5 A. 0,25 A would probably be enough.
Upto how many volts would it make sense to drive these motors with, with these four AA's? How may Watts should the DC/DC converter be able to cope with atleast?
Sorry for all these questions, but it turned out to be more complicated that I had planned with