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+--- Thread: Dynamo no go (/showthread.php?tid=2330)
Dynamo no go - Tiger - 01-02-2019
Despite rewound armature
New field coils
When spinning at estimated 1000rpm (drill spec)
Getting 1/4 volt
Spent loads of time on this so far
Any ideas much appreciatedÂ
Tim
RE: Dynamo no go - Ruairidh Dunford - 01-02-2019
If it isn't working you must take it back to the person who did the work for you.
RE: Dynamo no go - Tiger - 01-02-2019
Thanks Ruairidh
Unfortunately it was ME
RE: Dynamo no go - Ruairidh Dunford - 01-02-2019
Doah!
RE: Dynamo no go - "Slack Alice" Simon - 01-02-2019
Have you lost the residual magnetism in the field coils?
I think that is what happens.
There was quite a bit about it on the old forum.
Simon
RE: Dynamo no go - John Mason - 01-02-2019
Have you tried putting the terminal to a battery and see if the Dynamo spins like a motor. It should spin reasonably fast on a fully charged battery. If it does'nt look at how you have connected the fields to the brushes. I stripped my Dynamo down some years ago and put it back together wrongly and had symptoms like yours. A club member who was more knowledgeable on electriclkery than me sorted it out and apparently I had connected the inner wiring to the brushes wrongly.
John Mason
RE: Dynamo no go - Tiger - 01-02-2019
Just read the information on the old forum.
If I understand correctly running the Dynamo as a motor possibly re-magnetises the field
I will try this tomorrow and report back
Thanks for the repleys
Regards
Tim
RE: Dynamo no go - Tony Betts - 01-02-2019
May sound silly.
But is it correctly polarised.
Tony.
RE: Dynamo no go - Tiger - 02-02-2019
Not sure what’s the best way to check ?
Tim
RE: Dynamo no go - bob46320 - 02-02-2019
If the internal wiring is correct, then as others say, you need to run it like a motor. If you get the battery the wrong way round, you get a negative voltage, but no harm done, just put the battery the right way round and try again. If the dynamo is in situ on the car, you can "Flash" the dynamo into action by pressing the contacts in the voltage regulator together for a couple of seconds (Much frowned upon) - but it works.