Re: (ET) Curtis controller mod

["David Roden" <etpost drmm net>]

On 27 Apr 2016 at 17:41, Briggs, Michael wrote:

> Has anyone done a detailed "how to" on updating an Elec-Trak to a Curtis
> controller, including a parts list?

I recall someone posting about a Curtis conversion several years ago.  I 
don't think I've ever seen a cookbook style how-to, though.

Most Curtis golf car controllers are designed for series motors.  You'd 
need 
a way to make sure the field was powered before applying armature current. 
 
Also, I don't know whether it would apply to the golf car controllers, but 
some larger Curtis controllers' current limit doesn't work fast enough 
with 
the lower inductance that a separately excited motor armature presents.  
If 
this proved to be a problem, you could fix it with an extra high-current 
inductor in series with the armature.  

In behavior, sepex motors are closer to PM motors than to series motors. 
So 
as I posted the other day, I recommend trying a 4QD PM motor controller 
instead of a Curtis series controller.   But I'm sure you could get a 
Curtis 
to work with a little hacking.


David Roden - Akron, Ohio, USA

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