"LRod" wrote in message
Why? Most dual voltage motors run on windings wired series/parallel
(windings are in series with a source of 230V; parallel with a source
of 115V). In other words, regardless of how they are powered the
windings are always seeing 115V. So how would a motor running with
115V on its windings last any longer than a motor running with 115V on
its windings (or run any smoother/quieter)?

Delta claims their contractor saw motor is 1.5 HP on 115V and 2 HP on 230V.
How does this figure into the series/parallel in the windings? Or whatever?
Ed