Re: [CAD_CAM_EDM_DRO] How can you test a stepper ?

In a message dated 2/9/2003 2:07:56 PM Central Standard Time,
davemucha@... writes:

> what would make a stepper go bad ?
>

Dave: Open or shorted winding. Shorted windings within ONE coil, or shorted
to the other winding. To case? Or, if you are fiddling with an "8-wire",
you might have pairs of coils' polarity swapped.

Got a source of LOW voltage, but sufficient current, like an old-fashioned
"#6 dry-cell"? Or, say, a "lead-acid storage battery" with the "straps"
between cells accessible so you can attach a connection, each cell giving you
only 2 V. (Of course, a regulated "lab supply" putting out 1-2 VDC, up to
5-10 amp, etc., would be better!)

With that, connect ONE winding to + and -. Then the other, as well. Then
"swap" the polarity of one winding. (A pair of DPDT switches would make a
neat "test jig"!) Does it step? Note the direction. Then "swap" the OTHER
pair of wires. Did it step? If so, it's probably OK!

Lotsa luck!


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