Post Number: 6
|Posted on Saturday, December 15, 2007 - 03:26 pm: ||
I have an American Bosch 6v dynamo type 1003 fitted to a Kermath 12hp. I am looking for some information on how to control it's output. Were these early dynamos connected to an automatic regulator or were they manually switched? On this side of the pond we are more used to Lucas products!
Post Number: 36
|Posted on Sunday, December 16, 2007 - 03:58 am: ||
If it has 2 brushes it needs a voltage regulator. If a 3 brush, it is self regulating to some extent. Most 3 brush generators I dealt with in the past had the third brush adjustable. After loosening a screw or screws holding it, you can rotate it back and forth. This decreases and increases the output.
Post Number: 7
|Posted on Sunday, December 16, 2007 - 02:30 pm: ||
Thanks Eric, it is a 3 brush I just need to know how to connect the brush and field terminals.
Post Number: 301
|Posted on Monday, December 17, 2007 - 11:08 am: ||
One of the best places to get info on 3 brush generators is Dyke's Automobile and Gasoline Engine Encylopedia. It's well wortht he effort to get the book on eBay
The issue of regulation in automobile engines is more important than in marine engine. Car engines rev up and down a lot and since the outpt of a generator is a function of speed, you don't want to overcharge the batery when the engine revs are high, yet you want some outpt when the engine reves are lower.
With amrine engines the engine speed is less variable, so regulation is not so important.
In any event, many of the marine engine components were derived from automtive sources.
IN a 3 brush generator, the third brush creates a opposing current in the field winding as the speed of the generator increases so the output ( sort of) stays somewhat constant.
The setting of the 3rd brush is not critical. If you get output, then leave it where it is.