SMIDSY technical FAQ.
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We use Cyclons, although they aren't actually very common. Just about everyone
else uses Hawker or Yuasa.
You need to have sufficient battery power to run
your robot around for 5 minutes of combat. This equates to around
10-15 minutes worth of mucking around outside of combat. The
batteries need to use gel rather than liquid because if they get
broken or turned upside down they musn't leak all over the arena (and
the inside of the robot) so there's no point stealing the battery out of the
family car.
Most robots are designed around the batteries as they are
generally the biggest thing that goes inside. They are also heavy, so
don't buy more power than you need. Between 16aH and 25aH worth of
battery should do fine. For this capacity at 24 volts you should expect to pay
around 130 quid.
Using second hand batteries may seem like a good way
to save money, but ask yourself why the battery isn't wanted anymore.
If it's because it can't hold a charge and deliver the sort of power
it was designed for, then it's not going to be of any use to you either.
Yes, we've been there :-)
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The most common choice for motors is Bosch. Ellis Components do deals for Robot Wars
teams (80 quid each IIRC). The motors need to be around 750 - 800 watts to be
any use and you'll need two unless you're being amazingly clever. They need
to be able to run equally well in both directions and handle the high currents
produced when stalled (pushing) very well.
Iskra motors are starting to be used, also from Ellis. We use one for the disk
but aren't convinced they are the best option for drive.
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4QD speed controllers are made in the UK,
but you need to work our how to interface them with your radio receiver. We
use Team Delta boards from the
States (Team Delta make lots of dope kit for Robots).
The boards from 4QD aren't designed for robots but seem to work alright and
are around 100 quid per board. If you've money to burn, Vantec boards from
the States are designed specifically for robots and are meant to be the best
around but you'll pay around 500 quid for a pair.
There are other people making speed controllers, or you could make your own if
you're clever enough. Oh, if you're wondering, speed controllers control the
speed and direction of the motors which allow you to drive the robot around!
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If you use simple spade connectors then the impacts in the arena will easily
be enough to knock something free. We use push-push connectors
because they cannot be knocked apart.
Last modified: 2003-08-04 19:20:40 127
