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non conductors | 21 comments (21 topical, 0 editorial)

Re: non conductors (3.00 / 0) (#1)
by JW on Thu Jun 2nd, 2005 at 09:19:44 PM MST
(User Info)

I think its a good idea.

However There are some pro's and con's...

DISADAVANTAGES-

Regardless of high impeadance coolant utilized(for heat transfer removal) there will most certainly have to be a positive displacement electric pump utilized, this means possible amperage req's [exceedance] that such a stator could produce in the first place.

This forced circulation type of methodology would be akin/relative to direct losses commonly associated with energizing "field windings" as such, auto alternators, dont make a good candidate(for wind genny's), but most likely, the same type of parasitic losses from forced cooling (dcvolt pumping)loads would be 10 times worse than any field energization scnario... THIS IS ESPECIALLY TRUE WITH 1/8 COPPER TUBE WINDINGS.

most likely one would do better with high dielectric stregth (linseed)oil forced circulation to the outside of multi-strand windings,in the stator, with a phased zone circulation high flow convection circuit with some sort of raditaor.

Advantages-

The pumping load/force to be applyied to the forced cooling system could be derived from the mill blades itself...

This wouldnt be necessary in the first place, because(sp?) most windmill's dont rotate fast enough to induce hugh hysteriious losses in there stators's/windings.

However, "if" you were driving a load such as a motor does, this forced cooling methodolgy would make sense if the stator were driving such an electric motor. But quite frankly i think its a major overkill on any type of dual rotor type of windmill.

I have developed a 600amp continious solid state "DC" three phase switching array triggered by 6000hz pick ups modulated to operate with a fixed stator.

Im wondering if the standard 1x2x1/2in rectangular[neo] blocks can be procured with 2 separate 1/4in holes cut by water jet, in a centerish position...........

Re: non conductors (3.00 / 0) (#3)
by electrondady1 on Thu Jun 2nd, 2005 at 10:40:50 PM MST
(User Info)

ultimatly i had a large dia. vawt and miliple gear driven geni's in mind. ive come to the conclusion that if you want big power you must go big. i had in mind, between 12 -16 ft. dia. and 30 - 40 ft tall .i will build an initial 2 ft.dia. unit perhaps a 4 ft dia. as well . i have serious electrical needs. 13kw.s would be a good start. it was mentioned on this board that as much as 50% of the energy generated in the stators is heat. i want to capture that too. a form of co-generation . any way, thanks for the linseed oil tip. i assume i could use boiled lineseed oil? . the configureation i have in mind for this machine would allow me to design in about any rpm range i want . heat could be a factor. i have about 8 gal.s of two part epoxy paint, i have no idea wether it could be utilzed as a non conductive coating on the copper. even if it is non conducive, it might be too brittle to take much winding.

the devise you developed is a delta /star switch ?

there is a company here in canada named jobmaster magnets that will cut neo's to custom configurations with a computor controlled water jet.

[ Parent ]

Re: non conductors (3.00 / 0) (#11)
by JW on Fri Jun 3rd, 2005 at 10:45:44 AM MST
(User Info)

Hi Electrondady1,

The device I developed is a Mosfet swithching array. Actually its really just a bunch of dc solidstate relays wired in parallel. The trick in developing it was using an input signal of 4volts dc, to activate the solidstate relays, with fast switching speeds this is crucial. The star/delta switch is something different. But the stator wired in star, in my opinion, is the easy way when trying to convert a dual rotor machine into a traction motor. the "electronic commuter" would energize each of the dc phases at the right rotational position, using the mosfet array to switch power on to the phases. And water cooling could really benefit such an motor.

For wind gennys, its my opinion, cooling over the coils(in the stator) would be better for that application. Although construction could be a bit tedious. An alternative to linseed oil (boiled would be fine) is heat transfer fluid. This is a type of oil with a high flashpoint that would resist carbonizing.

I love this board :)

JW

[ Parent ]

Re: non conductors (3.00 / 0) (#15)
by electrondady1 on Fri Jun 3rd, 2005 at 12:51:36 PM MST
(User Info)

ok, i get it , this is a devise to turn a generator into a motor by controling which coils are energised and at what time they are energised.so a mosfet is a solidstate switch triggered by an electronic signal.

[ Parent ]

Re: non conductors (3.00 / 0) (#17)
by JW on Fri Jun 3rd, 2005 at 03:26:06 PM MST
(User Info)

That's exactly correct electrondady1.

As you can most likely imagion the star/delta swithing for a genny could be acomplished in the same fashion. Most will point out that mechanical relays could accomplish the same task, and since the swithing frequency(in and out from star to delta) would be like once an hour or something like that, burning up the contact point's in the relay is not a major concern. But it is very hard to compete with a mosfet(solidstate dc relay) in terms of the power req'd to energise it. Compared to a mechanical relay(like a auto starter soleniod) mosfets use way less power to energize. Im very impressed, neat topic.

JW

[ Parent ]

non conductors | 21 comments (21 topical, 0 editorial)

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