Re: motors/torque

[Frank Pittelli <frank-at-rctankcombat.com>]

Joe Sommer wrote:
> 
> I personally feel that the Hetzer's performance at the
> end of battles is now better for 24 VDC than when I had
> two batteries in parallel because I am not stalling
> the motors as much.
> 

Feelings smeelings ;-)

Your Hetzer *did* have better performance at the end of the battle when 
running on 24volts and I expect the same thing will be true when 
operating EV Warriors at 24v versus 12v based on the motor information 
that Steve recently posted.  Specifically, the EV Warriors will probably 
run more efficiently at 24v and therefore consume less battery power. 
Even if we keep the axle speed the same by doubling the transmission 
ratio from 9:1 to 18:1, I think the motor will have to work less to move 
the vehicle over the same terrain.  As you said, it will stall less 
often, which saves battery energy from being wasted.

Running at 24v has the added benefit of reducing the amps running 
through the wires and connectors, resulting in less loss as well.  On 
the down-side, we'll need to use 24v relays (not really a big deal) and 
get bigger transmission gears.

The alternative is simply to run inefficiently at 12v and replace 
batteries half-way during the battle.  The trade-off is the cost of two 
extra batteries (one each for the morning and afternoon battle) versus 
the cost of new relays and gears.

        Frank "Love The Tradeoffs This Hobby Throws At You" Pittelli