[ausev] VW FOX CONVERSION, GEAR RATIO QUESTION

[Chris Robison]

loopcat wrote:
> My bad. There are 4 brushes, 10 separators between each brush. So around 350 volts sounds right. 

My Warp13 is similar; it's also rated at 336V on the nameplate.  Does 
yours show a voltage rating?

> The motor is equiped with interpoles. To my understanding, it will not arc, and doesn't need the brushes moved.

Correct, it won't arc, though I'm not sure whether or not there's still 
an advantage to having advanced timing for better performance at higher 
RPM. Can someone else weigh in on that?  I believe that interpoles do 
give better high-speed performance, at the expense of torque (smaller 
main field windings to make room for the interpoles).

The need for interpoles or movable brushes is one of the things that 
makes regenerative braking difficult with series DC motors. If you had a 
regen-capable controller like a Zapi, this would be an ideal motor to 
pair it with.

> Do you know where I could find taperlock connectors for the motor and transmission? Maybe the machine shop could fabercate them.

We've been using key-and-setscrew style hubs without any problems; these 
are a single piece and so are going to be easier and cheaper to have 
made. It seems to be the general consensus among racers that taperlock 
hubs are better for extreme torque applications, but I don't think 
you'll be producing enough torque at 1000A to create a problem. I don't 
think a taperlock hub would be a bad idea, but it is a bit of a pain to 
reposition once it's been tightened.

   --chris