Re: [CAD_CAM_EDM_DRO] Re: Tawagawa Seiki steppers

Hey,

If that were the case, then braking mode wouldn't work on a normal
stepper either, there isn't anything special about a 5 phase motor for
that case. Two ends of a coil switched to ground brakes, just shorting
the wires you'll feel it, and it also works with two semiconductors
switching to ground. Try it and you'll see, and if what you're thinking
were true, braking wouldn't work for a single seperated motor coil on a
normal stepper either.

Also, on a 5 phase you can *NEVER* (one of the few times you can use
that word and be ok!) consider one coil by itself without then taking
that info, and apply it back through the other coils. Your end going
negative would still not be high impedance, it'd be being pulled up
through that other coil that has it's other side connected to +V. But
it doesn't get the chance to go negative, braking a coil works even with
a seperate coil, so 5 phase or 2 phase doesn't make a difference..



"Scott M. Thomas" wrote:

>
> If you think about it, with 4 coils powered you really don't have one in
> brake mode. Even though both ends of the coils are at the same potential
> (either + or -) the semiconductors on either end can only pass current in
> one direction, therefore which ever direction the back EMF generated on that
> coil was flowing, one end would be always be in a high impedance state so no
> braking would occur.
>