Posted by Janicholson on April 01, 2011 at 13:43:57 from (199.17.6.26):
In Reply to: M Starter posted by S2710 on April 01, 2011 at 12:49:30:
There should be no connection between any commutator segment and the armature iron/shaft. There should be connections from segment to segment across the commutator. This can be checked carefully with an Ohm meter of high quality capable of measuring in small Ohm ranges less than one ohm. On opposite sides every pair should have very close to the same resistance. A "Growler" is of massive help. It is an elecrtical test device that uses magnetic fields to assure the electrical status of the windings. The armature should show no differences in winding color, or solder joints at the connections to the segments. There should be no scuffing or wear on the outside of the core laminations where the armature would roll if laid on a bench. The segments should all look the same, and be ungrooved around the circumference. Fields should be isolated from the frame and both should have the same very low resistance, If different, there may be internal shorts that make one have less resistance than the other. We are talking tenths of an ohm, not hundreds of ohms. Visual checks of the connection quality where the stud mounts is also worth while. Jim
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