Dave-
There’s a vast spectrum between simple “contact” switching and “contactor controller” switching.
Early electric cars switched 84v and more with “drum controllers”. These schemes involved no electronics and, except in the case of the Ohio Electric car company, none of them used contactors. They pretty much all used well designed contact switching sequences coupled with the judicious use of load resistors. My 1920 Milburn Light Electric car runs on 84v and effectively uses a drum controller to switch power with a drum controller with 8 effective steps:
· Four speeds forward
· Neutral
· Electric brake
· 2 Speeds reverse
Besides the above ‘detent’ steps, there are effectively 7 other intermediate electrical transitions to reduce the stresses and capture the energy as the controller shifts speeds.
It’d be fun to develop a practical marine drum controller (though Duffy already did this).
I can help-
-Myles
From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com] On Behalf Of inganear1
Sent: Sunday, October 07, 2012 12:49 PM
To: electricboats@yahoogroups.com
Subject: [Electric Boats] Motor control without a controller
If I recall sometime ago someone in the group made a busbar type of arrangement to control voltage as a speed control for their system not using the normal electronic controller, or proposed anyway, can't remember exactly.. I would like to make such a system for a backup since I use 6 volt batteries in my 48 volt system on one of my boats. Can someone point me in that direction..
Dave K
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