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Dynamo help sought

The Maytag 72 could do with something to drive & I have this rather decrepit Lucas 12 volt dynamo looking at me expectantly. I watched "Waking The Dead" & went down to put a final coat of paint on the kickstart cover. Whilst it was toasting nicely in front of the electric fire, I had a look at the dynamo. The two brushes have leads which emerge on the surface of the outer cover on separate terminals. The field coil connects to a post which also comes out there, set in an insulated sleeve.

I cleaned the manky commutator, freed off the brushes in their holders & tried to motor it, connecting a 12 V battery to both brushes and bridging one then the other to the field coil post. Nothing. Whilst it got notchy as the power was applied, it wouldn't motor. I checked the comm with an AVO & have continuity between them all & whilst dusty, it actually looks pretty good in there.

What am I missing?

Regards,

J. Kim Siddorn,

Reply to
Kim Siddorn
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The other end of the field coil? (perhaps grounded to the body?)

Cheers Tim

Dutton Dry-Dock Traditional & Modern canal craft repairs Vintage diesel engine service

Reply to
Tim Leech

Yerst, I really should have looked more closely. I'd bridged the other brush to the outside of the field post, assuming it was a steel sleeve. Now I clean it up, it is black fibre. Bridging the other brush to the body does complete the circuit & it motors just fine.

A wire cup brush on the pulley spins it up to 3,000 rpm & the AVO says 14 -

15 Volts.

A thorough external clean with a sanding disc in an angle grinder & a run over with the brass cup brush removed all the paintwork, ali corrosion and old fashioned rust & it's sitting on the vice reeking of grey primer.

Regards,

J. Kim Siddorn, Regia Anglorum

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Reply to
Kim Siddorn

Hi Kim, Does Graham Correy still do that casting set to turn a dynamo into an open frame dynamo? It would probably look very nice that way!

-- Dave Croft Warrington England

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Reply to
Dave Croft

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