Re: Unipolar as bipolar.

Alan,

1) You can't have a series connection unless you have two coils.
Think of a 6-wire (unipolar) motor as being "pre-wired" in series for
you.

2) Inductance goes up as the square of the turns ratio. A series
connection has 4 times the inductance of a parallel one.

3) Half-winding is identical to parallel except for resistance. Look
at it this way: Let's say you wound the motor with a wire gauge such
that you only filled half the available space. You then realize you
have half the volume empty, so you rewind the motor using two strands
of wire (bi-filar) this time, using the same number of turns as
before. Is there any difference apart from the resistance?

Look at it another way. Does it make any difference when you wind a
coil if you use solid wire or stranded wire (2 strands in this case)?

Mariss


--- In CAD_CAM_EDM_DRO@egroups.com, Alan Marconett KM6VV <KM6VV@a...>
wrote:

> Mariss,
>
> Then your white paper was only talking about "series" connection of

BOTH

> coils being good for 1/2 power? There must still be some

drawbacks.

> Nothing's for free! You still have twice inductance, compared to

being

> allowed to parallel connect the coils. So I suspect there is still
> considerable power drop-off at higher speeds? The motor would be
> limited by it's inductive reactance earlier then the parallel
> connection. Still worthwhile.
>
> Alan