Post by thread:[OT]: What is an 'inverter duty' electric motor ?

At 03:11 PM 5/5/2006 +0300, you wrote: >I have never seen this qualification before. What does it mean ? > >thanks, >Peter 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. >Best regards, Spehro Pefhany --"it's the network..." "The Journey is the reward" spam_OUTspeffTakeThisOuTinterlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com

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. -- .....peteKILLspam@spam@petertodd.ca http://www.petertodd.ca

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. Peter