Lotus Elan

Electronic regulator with a dynamo

PostPost by: pereirac » Wed Aug 29, 2018 8:17 am

HI,
Just wondered if anybody still using a dynamo had replaced the electro mechanical Lucas control box with an electronic regulator and if it was worth doing? I realise the easiest option is to fit an alternator but for some illogical reason I quite like my heavy old dynamo :D

Carl
Carl

72 Elan Sprint
87 Excel SE
97 Alpina B10

http://www.lotuselan.co.uk
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PostPost by: gherlt » Wed Aug 29, 2018 11:21 am

Carl,
you might take a look at the Dynamators (et al), alternators with dynamo looks.
And then the old regulator RBxxx can be replaced by a dummy one or rewired, as it is not needed anymore.
Regards
1964 S1 (engine ready, awainting body paint)
1967 S3 DHC (now adjusted by Brian Buckland, totally calm idle)
1969 S4 FHC (final interior stuff)
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PostPost by: Andy8421 » Wed Aug 29, 2018 10:38 pm

I built a homebrew electronic control for a standard dynamo. I based it upon an aftermarket design for a classic British bike (can't remember which) that used 'pulse width modulation' to drive the field coil and control dynamo output voltage. I will see if I can dig out the link.

The Lucas control box does a couple of things, it disconnects the dynamo when its output voltage falls below the battery voltage, and it has a go at controlling the charge rate. I kept the electro-mechanical disconnect as I didn't want to introduce the additional voltage drop of a diode. I was racing the car and it was important to keep the original dynamo in order to be eligible, but I had a racing battery and the output voltage of the dynamo was all over the place. I built the regulator to give me a stable output voltage.

edit: while searching for the original circuit design I came across this: http://cloversystems.com/wp-content/upl ... rature.pdf

I don't know anything about the firm, but the product seems to be what you are after.
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