Re: Unipolar as bipolar.

Ron,

You are correct that motor torque is proportional to ampere-turns.
The concept that operates here is that current flowing into a node
must equal the current flowing out. In the case of a bi-filar winding
(two parallel paths), it doesn't matter how the current gets
apportioned, equally or otherwise. The same total current passes thru
the same number of turns of wire.

Always there is theory and there is empirical testing of theory. The
latter is the judge as to whether a theory is the true reflection of
nature or just a pretty construct. It is the final arbiter of truth.

In this case dyno testing bears out theory. The difference in results
(about 3%) is exactly accounted for as due to the greater resistance
losses of a single winding.

You can't fool mother nature; she always sets you straight, often
humbling you in the process. If you're smart you learn.

Mariss

>
> Ok, but I recall from my old electric motor class (tech high

schoool,

> pre- 1960) that motor 'strength' had a lot to do with AMP-TURNS, so

if I

> have 2 windings, both of the same turns count, and both carrying
> current, dont I get twice the magnetic field? Obviously if your
> 'stranded wire' analogy above is correct then I dont, but since

these

> wires are insulted from ecah other then we have 'different amps'

flowing

> through each coil.
>
> ron