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'[OT]: What is an 'inverter duty' electric motor ?'
I have never seen this qualification before. What does it mean ?
At 03:11 PM 5/5/2006 +0300, you wrote:
>I have never seen this qualification before. What does it mean ?
AFAUI, it means that the motor has suitable insulation in the windings so
that voltage spikes caused by stray inductance and PWM control won't kill the
motor prematurely. For use with VFD drives.
Spehro Pefhany --"it's the network..." "The Journey is the reward"
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On Fri, May 05, 2006 at 03:11:05PM +0300, Peter wrote:
> I have never seen this qualification before. What does it mean ?
It's one that has coils sized and insulated to be able to operate off of
squarewaves, as is produced by cheap inverters. This is often used with
3-phase AC speed controls that synthesize pseudo-sinewaves at varying
frequencies to control speed.
See http://www.5bears.com/vfd01.htm for one example of someone using an
inverter duty motor with a VFD.
On Fri, 5 May 2006, Spehro Pefhany wrote:
> AFAUI, it means that the motor has suitable insulation in the windings so
> that voltage spikes caused by stray inductance and PWM control won't kill the
> motor prematurely. For use with VFD drives.
Thanks for that. Now, that I know it, I am starting to worry about using
any kind of switching with motors *not* rated 'inverted duty'. I was
worried before, but, imho, it is now proven that *they* are worried too,
and likely with good reason.
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