Re: [CAD_CAM_EDM_DRO] Re: Tawagawa Seiki steppers

> First off 5 wire and 10 wire are basically the same thing, the 5
> wire just have the coil ends tied together already. 10 wire motors
> are simply seperated and you tie the coil ends together on the
> outside normally. But just like the 8 wire steppers give you choices
> in operation over a 6 wire, the 10 wire does have an extra way to run
> it.
> Draw a pentagram of coils with the ends tied together. Now go
> around it, label each point + and - to energize the coils. Look how
> that one coil always has either two + or two -, and is in braking
> mode not powered. Look at Jones' drive table and notice there are
> two adjacent +'s or -'s in each state. 5 wire (or 10 wire wired this
> way) are run like this, and it's part of why they're so smooth and
> low vibration, one coil is always braking and damping the motion.
> But only 4 coils are on. The real advantage to this way is you only
> need 5 half bridges, one at each corner that drives one side of two
> coils.
> With a 10 wire, you can power each coil seperately, so you can
> power all 5 coils. But you don't get the built in braking, so more
> vibration (although still quite good compared to 2 phase motors), and
> you need 10 half bridges to run them this way, one for each coil
> end. Needless to say between the loss in damping, only 25% power
> gain, and doubled semiconductor cost,most are run in the penta
> arrangement. They can also be run in a star tied in the center,
> which has some advantages over penta with still only 5 drive points.
> It's similar to the wye in a 3 phase motor. But almost everything
> I've heard of ran them as a pentagon with one phase in brake..
>
>
>
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