High effciency motors

[krw]

Wrong. A capacitor-start motor is just a special case of a split-phase motor. There are a few ways to split the phase but a different method doesn't mean that the phase isn't split.

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[J. Clarke]

Don't waste your time--if the catalog doesn't say "capacitor-start split-phase" he's not gonna accept it.

[phorbin]

I don't know nuthin about this but

[John McCoy]

phorbin wrote in news:MPG.30326082f2f3c4f8989c0b@127.0.0.1:

From an electrical engineering perspective, that article is wrong (and it shows how guys like Lew can get confused on the subject).

All of the motor designs shown there, except for the shaded pole motor, are split-phase motors. Any single phase motor with a starting or auxilliary winding is a split-phase motor, because the phase of the starting/auxilliary winding is not the same as the main winding. That's why they're called split-phase motors, because they have two windings with different phases.

John

[krw]

Actually, the shaded pole motor is also a split phase motor. The shading coil is the other phase. ;-)

[John McCoy]

krw wrote in news:lsmhsah7vnp9eh2vp4utnonsv59pb7ai3m@

4ax.com:

Well, in a sense that's correct, altho by extension that definition would mean all single phase motors are split-phase, since you have to have something offset from line phase or they'll never start rotating. It's not the most useful definition :-)

In engineering practice, tho, split-phase means split off from the line, as opposed to being induced (as is the case for the shaded pole motor).

John

[krw]

Yes, you need some offset but it could be a multi-phase (or DC/universal) motor rather than splitting the one phase. It might be true that all single-phase induction motors are split-phase. Can't think of a counterexample right now.

That's a distinction that's not universal.

[John McCoy]

krw wrote in news:c8lisa188kp9ht1g8mpsd2au945dh7oodc@

4ax.com:

Probably not, altho in my experience it's always been so.

John