I am making a tray bot this year and have searched everywhere for an explanation. During driver control, our robot runs fairly well and shows no problems. About a minute or so in though, it starts slowing down. My coach and I suspect that the motors are overheating. Could anybody tell me why this is happening or redirect me to a topic that talks about the same problem?
Here are some specifics:
cortex said that “motors had passed heat level three”
robot weighs about ten pounds
is direct drive with gears in a 1:1 gear ratio connecting the two sets of wheels
What internal gears are you using on your motors? You shouldn’t be using anything more than 200RPM for that heavy of a bot.
You are right, the temp. levels prove it is overheating, but there are a variety of reasons for this. I’d make sure there’s nothing causing excess friction or if something is in the way.
@Deicer, I’m not sure what internal gears we have as we haven’t “dissected” a V5 motor yet as we just got them this fall. Could you explain the 200RPM thing a little more?
@RoboKnight, Yes. I mean brain. Everyone at my school has always used “cortex”, so sorry for the confusion. The brain referred to both of the V5 motors that control the wheels. they are relatively exposed, with nothing over them, but a solid metal plate under them.
By default the motors have the green 200RPM cartridge in them. You can see the color right above the shaft hole in the motor. If you have the faster one (600 RPM) odds are the motor is burning out trying to get your bot to move that fast.
yes. Next step is to see if there is anything making the wheels harder to turn. If you want to upload a video we can help, but I imagine it is just too many shaft-structure connections gone without bearings.
you can see one of the motors in the back corner and you can also see that I used some of the bearings that came with the V5 kit on the inside of the wheel structures. sorry that it is blurry as i took the pics with my chromebook since it was the only thing I had at the time. I can get some better pics tomorrow.
I can’t quite see how the wheel pairs are connected, but I see numerous shafts sticking out of the c-channel there. More connections = more friction. (also… no bearings on them.) Unless something big is holding you up this might turn into a long search for ways to reduce friction. You might just be having issues since you only have a two motor drive.
It could be from mounting your 5 wide c channels inside each other. This would cause your bearings to not be aligned as some are a little high and some are a little low. This might be causing your friction problem.