OK, you guys have probably seen this one a lot but after doing a lot of research there are still things i don't know so i wondered if you guys could help me out.
I've purchased a Turnigy c80100-130:
These are the motor's specs:
Motor Stats:
Model: HXT80-100-B
Wire Turns: 8
Resistance: 32ohm
Idle Current: 2A
ESC Required: 130A
Input Voltage : max. 48V
Kv : 130 rpm/V
Weight: 1570g
Shaft: 12mm
Voltage Range: 20-48v
Non Load Current: 2.0A
Maximum Power: 6500W
Equivalent: 60-80cc Gas Engine
I disassembled a freeboard i had lying around and took the trucks off(of course i'm going to dismount the third red wheel):
And am going to use an old Sector 9 deck:
There is just one thing i really do not know, how do i find a suitable ESC that can be used with an Arduino:
I want to archive something like this:
I have absolutely no experience in RC cars/plains/etc, this was a pretty impulsive purchase but i'm going to have very much spare time in 3 weeks so....
Ah thanks, totally forgot about that, included the specs in the first post. I'll resize the pictures tomorrow for they are unfortunately a little bit too big.
rutierut:
Voltage Range: 20-48v
Non Load Current: 2.0A
Maximum Power: 6500W
6500W is about 8HP and would send that board at absurdly fast speeds. A well-trained athlete, for a short duration, is capable of about 250W of power. If you're running at the recommended 20V minimum you shouldn't need more than a 30A ESC.
The practicality of loading enough batteries onto the board to provide that motor with enough power to meet its needs is also a consideration. Even at 30A you're going to need a crapload of batteries.
rutierut:
Voltage Range: 20-48v
Non Load Current: 2.0A
Maximum Power: 6500W
6500W is about 8HP and would send that board at absurdly fast speeds. A well-trained athlete, for a short duration, is capable of about 250W of power. If you're running at the recommended 20V minimum you shouldn't need more than a 30A ESC.
The practicality of loading enough batteries onto the board to provide that motor with enough power to meet its needs is also a consideration. Even at 30A you're going to need a crapload of batteries.
Yhea i knew it would be a little bit too much but i thought it was better to have a overpowered motor instead of a underpowered one. One of the other cons is that it's a little bit to big, it fits underneath the board but i only will have a few centimeters left so i'll have to come up with something else. But i did really underestimate the capacity of the batteries, i thought i had seen a 100Ah battery for 30$ but that seems impossible looking at the prices now. Do you think i would be better of selling this one and trying to find another?
Well trained athletes can reach about 1kW for short durations, 450W is sustained output of a Tour de France
hill climber.
The apparant friction drive mechanism in the picture cannot handle anything like the power involved, a good wide
traction tyre and chain drive would fare better. The motor has little cooling in that orientation so cannot handle
8kW anyway.
Indeed - its doable for large RC brushless motors, but you'll need a hall-sensor ESC
to match it.
However I think you have some other issues:
drive mechanics cannot handle the power - the driven wheel will just melt!
Tread on the drive wheel is a good idea!
You want accurate torque control for such a system or you'll just be thrown off
when it accelerates - RC ESCs are not normally designed for this, they are designed for
powering an airscrew.
Cooling - such a motor is intended to be in the airstream of its own airscrew.
However I think you won't need to put anything like full current through
that motor, its over powered, so this may not be too much of a problem.
Gearing - decide on a sensible max speed, calculate the driven wheel rpm, then
select a power train to match - 10mm wide T5 belt system springs to mind, or
cycle chain/sprockets.
[ I should add "good luck, don't forget a helmet, pads and spine-protector!" ]
OK i've decided to sell my current motor and buy another one, i've looked at several ones but what should i be looking for?
I've read that the Kv should be around 270
I know it shouldn't use to much power because that will require a lot of batteries
the size is of course important
it should be a brushless outrunner
You need to work out your speed and torque requirements first, then choose the
motor / gearing. Don't go for a sensorless BLDC, its not going to produce much torque
from stationary and spin-up sequence may fail.
Have a look at other similar projects to see what can work, it'll help suggest
realistic speed/torque values. There's bound to be at least one on hackaday!
MarkT:
You need to work out your speed and torque requirements first, then choose the
motor / gearing. Don't go for a sensorless BLDC, its not going to produce much torque
from stationary and spin-up sequence may fail.
Have a look at other similar projects to see what can work, it'll help suggest
realistic speed/torque values. There's bound to be at least one on hackaday!
Yhea i was originally inspired by a project on hackaday but this is the best build i've seen so far:
unfortunally Turnigy does not sell those anymore, i can only find these:
