Haven't seen any tanks on the battlefield with on-off motor controllers
in quite a while.
With regards to the scooter motors currently being used and the newer
generation of brush-less motors, let me add to the list of things that
Prof. Sommer touched upon:
0) It's about time somebody started investigating this area. We
old-timers can't keep doing the work for everyone :-)
1) Scooter motors have been proven reliable over many years of hard
battling. We have no battlefield data for brush-less motors. As you
are the pioneer in brush-less area, you'll need to provide good
documentation along the way ... both good and bad.
2) Scooter motors weigh more, but that includes the weight of the gear
reduction to bring them down to 400 rpm. Brush-less motors require
external reduction, so you need to include that weight and cost when
comparing them to scooter motors.
3) Scooter motors have a compact gear reduction that makes them easy to
fit into almost any tank. Custom building a compact 30:1 reduction will
take a couple iterations and more money. Personally, I really liked
building reduction systems, but they do take extra building time and
room in the tank.
4) We know from years of battlefield experience that scooter motors @
400rpm provide sufficient torque to drive the tracks properly in all
kinds of terrain, while conserving battery power. The motors you
referenced provided thrust numbers for different size propellers, but
you'll want to know torque and efficiency ratings before picking a winner.
5) Quite a few different types of motors have been used and abused on
the battlefield over the years. Each time, the person using them
believed that they had chosen the best alternative *for them*,
optimizing performance, cost and reliability. Nonetheless, all veteran
battlers have switched from one type of motor to another at least once
as evolution shed light on a different sector of the optimization space.
Your experiments will hopefully shed some light into yet another design
sector, but don't fall into the trap of believing that every dark sector
is full of gold. The brush-less sector may be the next step in
evolution or it may be a tar-pit swallowing up your time and money.
We've been in enough tar-pits to know that they exist and that you don't
always see them until you're well into them. We won't know whether the
brush-less sector is solid ground or not until you build it, battle it
and report back your findings.
Happy hunting.
On 3/29/2013 5:40 AM, Niels Erik Kristensen wrote:
Why does everyone use big heavy and week brushed motors?
Furthermore its difficult to buy regulators to them, so many "tankers"
control there tanks with a system of relays?
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