101 réponses à ce sujet

[OdorousWo1f]

what wattage and RPM do you think i need?
must work with 12volts well as the other motors we looked at were 24 volt. maybe a lower 12v version of the motor i was looking at would work

[firened]

we have to find the target speed. perhaps it would help if you can try some robots and get a feel for speed and handling characteristics. i can tell my dad to set out my trx-4 "Tooster" if you wish?
icecream is possible too.

maybe ask @Micro or @xhap0w or who else has a relatively fast robot for a test drive?

from estimates:
speed => we'll figure out RPM and wheel size proportions.

speed + weight => we'll figure out wattage

i have lots of assumptions in my head, can you tell me more about what you imagine and wish the robot to be like?
some keywords:
length, height, weight, push force, target terrain, suspension, sidewalk step capability, wheel grip, wheel type: air filled, solid, tire notches; cargo capacity, frame material, 3D printed,

[OdorousWo1f]

sure. i can try tooster today.
i'm unsure about exact length and height yet. weight all together i'm guessing 15 - 25 pounds. the terrain will be sidewalks, gravil, dirt, bumpy terrain. unsure about tires yet. frame material will be out of those X frame stuff. essentially very similar to Pierre's 4x4 just bigger and with lots of different modifications
then with tooster i can get a feel for what drive settings (ramp) i'd need for a big robot
already tested icecream before. i like it's driving characteristics but again too slow. still a bit too slow (presumably) with wheels which should give us double speed because of the track resistance. would be nice to re-test to get a better feel eventually.

[firened]

ok that's helpful.
x-frame are those aluminum square rods?

[OdorousWo1f]

yeah

[firened]

@Pascal 's trx-4 with stock motor is insanely fast!
i think 30-35 km/h

[OdorousWo1f]

oh wow

[xhap0w]

I don't have robot anyone. But it's average speed was little bit less than an human walk.

[OdorousWo1f]

https://www.amazon.c...y,aps,81&sr=8-8

@fire_ned found a bigger battery, for cheaper! could incorporate some sort of external BMS.
with those statistics that i gave you, what sized motor do you think i need? (updated the weight to 15 - 25 lbs because of the battery)

[Mike118]

This is a very heavy battery... this thing alone should weight around 10kg ( around 20 lbs ) .

[OdorousWo1f]

yeah it is heavy. it'll probably be worth it with the large capacity + larger motors

[Mike118]

What is your budget for this robot ? What is the wanted size ?

[OdorousWo1f]

i don't really have a budget. maybe twice the size of pierre's 4x4. it'll be 4x4 just bigger, better, and have lots of changes.

[Mike118]

Don't you think that a robot like fredj21 robot would be great for you ?

[OdorousWo1f]

i'm going based off of pierre's 4x4. it's based off of the design of 4x4.

[Mike118]

I guess that twice the pierre's 4x4 will be too big for indoor use...
And you said you also want use it indoor...

[OdorousWo1f]

it's not for indoor. when did i say i would use it indoor?
if you meant the message saying i wanted motors that also control good at low RPM when i also said that'd be also good for quick indoor testing

[Mike118]

For exemple i have this one that is too fast for indoor x)

[OdorousWo1f]

it looks too fast for indoors.
icecreamtruck has torque to move itself at near minimum throttle. that's what i'm looking for along with decent speed. unsure if there's a motor that can do both. not a real requirement but a nice-to-have thing

[Mike118]

I would highly recommend you to buy a nice rc car truck and then just modify it a little to add the raspberry pi... would be way easier and less expensive for you...