On Mon, Jan 25, 2016, at 01:23 PM, Gene Heskett wrote:

> 
> Now if Marius can clarify by asking the driver to go 5 rpm, and getting 5 
> rpm exactly. Or driving it temporarily with line frequency power while 
> watching it under flourescent lighting.  If the blur is stationary, it 
> is a synchronouse motor.  If not, the blur will be drift CCW at whatever 
> the slip angle is. 

Hopefully the info is on the nameplate and no testing is required.

The tests suggested are tricky unless there is a load on the shaft,
at zero load the induction motor will be going very close to sync
speed.

-- 
  John Kasunich
  jmkasun...@fastmail.fm

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