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Old 07-03-2013, 05:37 PM   #31
Warin
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Quote:
Originally Posted by Plaka View Post
I don't know the circuit.
And your tell someone else how to fault find it?

This circuit is used on MOST cars, trucks, buses, farm tractors, bmw motor cycles, motoguzzie motor cycles, tractors ... anything that uses an alternator to charge a battery! It is common. And I can draw it from memory. Much easier then the block diagram of a TV!
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Old 07-03-2013, 06:07 PM   #32
Plaka
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Quote:
Originally Posted by Warin View Post
And your tell someone else how to fault find it?

This circuit is used on MOST cars, trucks, buses, farm tractors, bmw motor cycles, motoguzzie motor cycles, tractors ... anything that uses an alternator to charge a battery! It is common. And I can draw it from memory. Much easier then the block diagram of a TV!
So quit with the drama, draw it and post it.

Put up or shut up, k?
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Old 07-03-2013, 06:40 PM   #33
Warin
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Originally Posted by Plaka View Post
So quit with the drama, draw it and post it.

Put up or shut up, k?
Yep Yep .. put the link up for the battery FAQ and the more specific link for the alternator bit .. should have reput it up on my 'rant' .. Just surprised at the offered help with the lesser knowledge? Something like that ..

Again http://jgdarden.com/batteryfaq/carfaq5.htm

That has a diagram of the alternator, output graph, a description etc etc .. not retyping it here when someone else has already done a reasonable job elsewhere. I'd do the diagram differently .... but it would only be minor tweeks.
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Old 07-04-2013, 08:30 AM   #34
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Quote:
Originally Posted by Plaka View Post
Get the charging system book from Mottorad Electric too. I don't have it but If I know Rick it will be money well spent. Next time I have some cash I'm getting it just to add to the library.
I don't think the book has been available for a while? has he reprinted another run?

For me, if the ignition is on, but the GEN is off before the bike is started, it's been the rotor. Twice. Common problem.
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Old 07-04-2013, 11:41 AM   #35
ashrubbery OP
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Thanks everyone for your responses, much appreciated!
I have confirmed that it is indeed the rotor.

Ive heard these may be able to get rewound?
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Old 07-04-2013, 03:08 PM   #36
Darryl's bmw
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Originally Posted by ashrubbery View Post
Thanks everyone for your responses, much appreciated!
I have confirmed that it is indeed the rotor.

Ive heard these may be able to get rewound?
Yes it can be rewound, but it is a pain to do.

I have one that was wound in the opposite direction with slightly bigger wire. In theory the spinning wires will tend to close rather than open.
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Old 07-04-2013, 03:12 PM   #37
Airhead Wrangler
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Originally Posted by ashrubbery View Post
Ive heard these may be able to get rewound?
New rotors can be had for $90. I can't a imagine you'd find anyone willing to endure the frustration of rewinding one of those for much less than $90.
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Old 07-04-2013, 03:17 PM   #38
Plaka
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Quote:
Originally Posted by Darryl's bmw View Post
Yes it can be rewound, but it is a pain to do.

I have one that was wound in the opposite direction with slightly bigger wire. In theory the spinning wires will tend to close rather than open.
They go open where the wires aren't potted inside the fiberglass tubes. Vibration gets to them. if you inject epoxy into the tubes they are more robust. if you change the wire diameter you also change the amount of field the thing can generate and hence it's output. This is why there isn't a single HUGE wire in there. it's the number of turns that count and there is only so much room.



Mottorad Electric sells rebuilds on an exchange basis. I imagine most electric motor shops could do it too but I'd go with someone who has a lot of experience with that exact part and it's specs. The price is decent too.
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Old 07-05-2013, 04:02 AM   #39
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http://www.euromotoelectrics.com/pro...t-rotor642.htm

Common place for the rotor to fail is where the wire crosses from the winding.
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Old 07-05-2013, 04:40 PM   #40
Warin
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Originally Posted by boxerboy81 View Post

Common place for the rotor to fail is where the wire crosses from the winding.
to the slip ring? I would think. The slip ring being a fixed point, the winding being another and the flex takes place in the crossing. You can also add the heat stress of the soldering at this point.

---------------
There should be little influence of the winding direction - the main force is centrifugal. Changes in speed in one direction would have foces associated with winding direction, but speed changes happen in both directions. So teh direction of the winding won't matter much.
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