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DC electric motor

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sbkenn

sbkenn

Mechanical
Joined
Feb 22, 2010
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64
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IE
Hi. Can someone confirm that adjacent commutator segments SHOULDN'T read zero ohms ?
I just received a replacement armature for a small starter motor, and almost immediately noticed that the cuts to separate the segments don't look like they go all the way through the copper. I don't have a milli-ohmmeter for a precise measurement, but I am fairly sure that only opposite segments should connect together through the (single turn) windings.

TIA
Shane
 
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It is really hard to read resistances as low as you should have with a DVM.
Most commutators have insulating material between the bars. Adjacent commutator bars are "electrically close"
Audel's NEW ELECTRIC LIBRARY VOL. II said:
Screenshot_from_2022-03-07_18-31-42_nrbfe9.png
Click to expand...
 
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