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DW505 type 3: What is the resistance specification for armature opposing pole pairs? Also, isn't each pair supposed to be isolated from the other?

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Vernon Taylor

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Measuring across the commutator opposites is a rough check - if each pair has the same resistance it is probably good but even then there are no guarantees. I have never seen the armature resistance stated for any motor though that doesn't mean such figures don't exist.

It would seem logical that each pair should be isolated but that generally is not how the armature is wired and each commutator segment is the termination of two coils.

In reality there is only three ways to test an armature - either build it into a motor and see if it performs ok, use an automated motor fault analysis machine or one of the dedicated armature testers such as an armature growler.

Posted on Aug 01, 2020

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