I used a curtis to power the armature and ran the field through a rheostat (E15). The field is usually at full power and it runs plenty fast for mowing in D1. If I want to race it (or run back to the garage when it starts raining), I can weaken the field as much as I want.
The field at full strength only draws about 2 amps. A relatively small rheostat is all that is needed.
--- On Thu, 2/10/11, David Plamondon <roberttroll hotmail com> wrote:
From: David Plamondon <roberttroll hotmail com>
Subject: (ET) Thinking out loud - Controller
To: elec-trak cosmos phy tufts edu
Date: Thursday, February 10, 2011, 12:49 PM
If one wanted to replace just the first three speeds, and not worry about field weakening, is there a simple controller that could do this? To my understanding the controller options that are available have special "software" that allows for the weakening. If i didnt want that, what possible options are there? I would basically be looking to replace the ribbon resistor and card on a E15 - possibly a E20. Thoughts?
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