CAV DEL type dynamo question

[Mark McKibbin]

Are the main and third brush boxes insulated from the end plate?

Yes I have tested, they are open cct to the frame

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Hi Mark, when I look at your photo  it looks like the gaps between the segments of the commutator where the windings are soldered to it are not clean. This could cause short circuits within the windings.  it would do no harm to clean these out (and the gaps on the rest of the com) with a narrow sharp  tool such as a pointed knife used upside down so that the sharp edge is facing upwards.

John Mason

I have checked resistance between segments and there is some although not much at about 0.9 ohm

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The two pole armatures are wound 1 to 2  to 3 etc and much can be fathomed with a digital meter which reads very low ohm. The 4 pole advances in steps of several segments and requires more thought to check .

Thanks Bob,

With that in mind I will have another look with the multimeter.