first robot

[terry]

Re: first robot

that battery is perfect and very good price,i recon 2 in series would be perfect,
but someone with a f/w would know for sure as i run a h/w.

[elobire]

Re: first robot

ok thanks for the help il order 2 sets of those and look up how to connect a series circuit.
EDIT:
actually i found these:
http://cgi.ebay.co.uk/NEW-12v-700Mah-Re ... 518e0fecce

their only a fiver each but do you guys think their reliable?
i proberly will stick with 2 on each motor (making the 24v that the motor requires) but im guessing a normal speed controller may not take that kind of voltage? im so what speed controller should i buy?

[daliad100]

Re: first robot

Series is positive to negative, parallel is positive to positive.

[terry]

Re: first robot

ive just noticed you want to use 24v motors you will need a bit more voltage than 14.4 v
(2 sets in series)
i think the average motor volts on a f/w is lower than 24v, you will need both to be the
same voltage to operate.
the 700mah packs will never work you would propably need 5 times that mah current ie 3500mah.
as for speed controller loads available, i would use a wotty simple and reliable.

[elobire]

Re: first robot

ok im going to look for some new batterys with more mah
EDIT: ive got my brother sorting out some batterys, but does anyone know any sites where i can get a speed controller that can handle the voltage i need?

[psycho_fling]

Re: first robot

american speedos:
victors
rs80d
maybe xxl with mods

england the wotty

or you could spend loads and get roboteqs and stuff but that is overkill

search vapextech in ebay shops for batteries

[elobire]

Re: first robot

thanks, looking at vapetech shop now.
where can i get wotty speed controllers from?

[psycho_fling]

Re: first robot

ian watts

[elobire]

Re: first robot

ok thanks il contact him after Christmas or after i get the rest of my parts.

[typhoon_driver]

Re: first robot

The electronize controllers will handle those fine, are rugged as hell, well proven in robots and cheap as chips compared to most other controllers.

Battery wise look for something around the 3000mAh mark plus with the right voltage.

[elobire]

Re: first robot

thanks, they seem pretty cheap and look decent enough.
thinking about getting two of these: http://www.electronize.co.uk/FR12VR_spec.htm
now i just have to search for some good batterys for the motors and buy all the parts and start planning my design.

[RogueTwoRobots]

Re: first robot

For batteries, I would also suggest the Vapextech range mentioned above. I have had problems with them in the past in terms of some cells burning out but that was because I was drawing more current from them than was recommended. All the other times I've used them within their limits, they have performed very well.

Using them to power two scooter motors will not push them beyond their capabilities so should be adequate enough for your robot. So for 24V motors you will require two packs of 12V wired in series and, as mentioned, to last a fight or two you really need a 'mAh' (milli-Amp-hours) value of 3000mAh or above. These ones:

http://cgi.ebay.co.uk/12V-3700mAh-NiMH- ... 3353ee4e1a

are 3700mAh and should last at least a couple of fights. Doesn't sound very long but this is the nature of combat robotics. Those packs are also £27 each, which is £54 for 24V. It may seem expensive but you get what you pay for, and these batteries will do a good job.

Best of luck with the design/build and make sure to get some pictures of it up once it's taking shape if you can

[elobire]

Re: first robot

when you say to wire them in series, do you also mean that both motors will draw power from the same 2 batteries?
cant wait till i get the parts now and start building it

[RogueTwoRobots]

Re: first robot

That's correct yes. Both battery packs have a negative (black) wire and positive (red) wire. You connect the black wire from one battery to the red wire of the other and then you are left with an unconnected wire from each pack. The voltage from these wires is now 24V. You connect both your speed controllers to your battery wires in parallel (i.e. each speed controller has one red wire and one black wire. You connect the two red wires from your speed controllers to the unconnected red wire from the battery pack and the same for the black wires). This means that both your speed controllers will get 24V and therefore both motors will get 24V.

[elobire]

Re: first robot

ok thanks for clearing that up, was getting woried when i thought it may cost me £100 for 4