Morning all, so a few weeks back I started building a VEX EDR tank to move me around (95kg). I had quite a lot of experience doing this with LEGO and VEX IQ. However I am finding it a real challenge which has really surprised me since VEX EDR is Metal, and more powerful than LEGO and IQ.
First off I tried to run 8 motors off 1 Cortex + Power expander (direct motor to wheel connection). This ended up shutting down pretty fast. https://www.youtube.com/watch?v=ojPM1XSDD9M
I then doubled everything (2 cortex, 16 motors, 2 power expanders). This worked better but still no where near workable
I spoke to a few people and they said the motors where shutting down and so I should gear it down. I really did not want to lose speed but went for a 2.3 to 1 ration (84, 36 if I remember). I then went back to a single cortex, 2 power expanders and 8 motors, the motors drive 2 omni wheels each side and the rest are free wheeling. This so far has been the best but still not great. I have now added 4 extra omni wheels to help with the weight.
Tonight I plan to add more motors and power expanders (using the Y 3 wire cable) and put power through more wheels.
Anyone got any ideas?