Re: [CAD_CAM_EDM_DRO] Strange motor - question

is there permanent magnet in it??


shabbir
At 06:25 PM 11/6/2001 -0800, you wrote:

>I recently picked up a motor which was labeled as being made by
>Emerson. It was a 230vac, 60 hz, 3 ph, running at 3s50 rpm. Takes
>3.3 A and had a K-2 on the label. Also listed at 1/x hp. The label
>is incomplete and I have no other information. There are 3 wires
>out.
>
>I tried running the motor using my Hitachi LJ100 VFD and got
>errors. The motor tried to turn but only got around about a third
>of the way. Eventually I opened up the motor and found it was 24
>poles which explained why the VFD didn't drive it.
>
>It is a nice small motor and appears to be 1/4 hp. The field coil
>and armature are about 3" long. There is nothing else inside the
>case, which is about 4" OD and 5 1/2" long, totally enclosed, and
>has a foot mount.
>
>I can't find out a thing on the Emerson/USMotor site so the motor
>must be an OEM/special. In fact I can't find much on motor
>construction so I don't know what 3 phase motors having 24 poles are
>used for.
>
>The question is: What have I got? Is this some sort of synchronous
>motor, or an AC servo? Anyone have any ideas - especially how I can
>run it off of a VFD?
>
>JerryK
>
>Addresses:
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