Convert Dynamo to Regulator

[arthurf]

G'day All,
I would like to convert my 250ETZ from Dynamo to Alternator, and wondered is it possible (easily), have any others done that.

If yes the conversion is possible, how easy is it, and how successful?
Thanks in advance, Arthurf

[Blurredman]

Hi,

The etz250's system is already a kind of three phase type alternator.

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[arthurf]

G'day All, Looks like I have stuffed up what I really wanted to know!!!
What I really want to do is change the existing Electrical generator (which I believe to be a Dynamo) to a later style ALTERNATOR. I would like not to have to change the Dynamo brushes again! They seem to wear out too quickly for my liking.
Yes I can run the bike on battery only when the brushes are low, but I do not consider that acceptable. Whilst I do not know a lot about electrics, I know that there are a rectifier and a regulator to convert the 3 phase AC dynamo generated power into DC to maintain the battery.
Sorry if I have started a wild goose chase.
Thanks, Arthur

[Blurredman]

Hi Arthur,

I'm not really sure what you mean- but then I also don't know if you have a non-standard set up?

Any alternator in a car contains a rectifier and regulator too, just as the ETZ does! Except they are items typically internal to the alternator unit. MZ obviously didn't have enough space to contain all three items behind the generator cover, not least because the items used are rather large and spaced them all out a bit. This also helps with rectifying problems with the bike individually, instead of just replacing the alternator as one unit as you typically do with a car. MZ's moto is:

"Finding the actual cause of the trouble ensures that no material is wasted and labour costs are restricted to a minimum."


Although the terminology is often translated in such a way to lead people to believe otherwise, all three items together, the stator/'generator' (I think that actually the stator is a Mageto instead of a Dynamo (unlike the 6v MZs which are Dynamos but use a commutator and resistor for converting to DC)?) as the German manual calls it, the rectifier and the voltage regulator make the whole unit an alternator. A three phase one that is exactly the same as any car. There is no way the vehicle can be powered without the battery. The ignition power is soley produced by the battery, and the alternator keeps that battery at a constant electrical level in order to achieve this.

You know, I've never had to replace brushes on the bike? Normally they should probably last at least 50,000 miles on such a machine. Indeed the brushes on my car alternator that failed in 2016 had only worn out to nothing at 130,000 miles..


Have you got a non-standard system or something? What's the backstory here?

[dave47]

The ETZ250 already has a good Bosch type alternator and the brushes are almost indestructible. Alternative alternators are available from Vape and possibly Tezet, and they are very easy to fit, but there is no point as long as the original is working OK.
My understanding:
Dynamo: output coil rotates inside the field coil.
Alternator: field coil or magnet rotates inside the output coil(s).

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