DC motors for wind power

[Sjouke Burry]

David Nebenzahl wrote:

On 7/27/2009 11:26 PM Dave Plowman (News) spake thus:

In article <4a6e47e0$0$7468$822641b3@news.adtechcomputers.com>,
David Nebenzahl <nobody@but.us.chickens> wrote:

[someone else wrote]

A DC generator generates an AC waveform that is mechanically rectified
by the commutator and brushes.
No, an *alternator* does that (which is why it's so called). A generator
just generates plain old DC. Like the ones on old VWs. No diodes.
The clue is in the commutator. That is a mechanical switch which does
approx. the same as the diodes in an alternator. If the dynamo
intrinsically produced DC it would merely need slip rings as in an
alternator.

What in the world are you talking about? "Mechanical switch"?

The commutator is a set of rotary contacts. My VW (old 6-volt one) had a
generator with a commutator. Produced DC without any diodes.


Wow, A miracle, please show us how!!!

In about fifty years of work in the field, this would be the
first time to see one.

 

[Arfa Daily]

"Jeff Liebermann" <jeffl@cruzio.com> wrote in message
news:mteu65h6kkbgn89s18faig1opo1m1lb2d3@4ax.com...

On Tue, 28 Jul 2009 15:57:02 GMT, zekfrivo@zekfrivolous.com (GregS)
wrote:

Too bad around here, we have miles of rivers, but ZERO water driven
energy. They have new turbins out that you put in rivers and get
some energy. Yeasr ago they did not even think of that. They still
don't.

The problem with rivers is that without a falls, there's no vertical
head to run a high speed turbine or Pelton wheel:
http://en.wikipedia.org/wiki/Pelton_wheel
This is usually solved by building a dam, which has profound
aesthetic, ecological, and environmental issues. It is possible to
use a fully immersed low speed turbine, but to get enough energy from
the usual slow flow rate and high volume river, the number of turbines
and/or their size tend to be large. For example:
http://en.wikipedia.org/wiki/Kaplan_turbine

Also:
http://en.wikipedia.org/wiki/Water_turbine
http://www.homepower.com/basics/hydro/

Another problem is that the power output of the water turbine is
directly proportional to the head and to the flow rate. Unlike the
wind turbine, where the output is proportional to the cube of the air
speed, water power generators tend to become very large at higher
power outputs. Where the flow rate is minimal, the usual solution is
a higher dam.

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

I saw a programme on the TV a while back, where a fully submerged vertical
turbine, had been placed in a river here in the UK, that had a substantial
tidal flow. The flow rate of the water first in one direction, and then in
the other as the the tide turned, was remarkably constant, and allowed the
thing to generate failrly significant amounts of electricity, more or less
continuously. I think it was part of an experiment to see if this was
potentially a good way to harness tidal energy.

Arfa

 

[Arfa Daily]

"Jim Yanik" <jyanik@abuse.gov> wrote in message
news:Xns9C56B482E68F6jyanikkuanet@74.209.136.86...

zekfrivo@zekfrivolous.com (GregS) wrote in
news:h4nj56$iik$4@usenet01.srv.cis.pitt.edu:

In article <h4ni5i$iik$3@usenet01.srv.cis.pitt.edu>,
zekfrivo@zekfrivolous.com (GregS) wrote:
In article <mteu65h6kkbgn89s18faig1opo1m1lb2d3@4ax.com>, Jeff
Liebermann
jeffl@cruzio.com> wrote:
On Tue, 28 Jul 2009 15:57:02 GMT, zekfrivo@zekfrivolous.com (GregS)
wrote:

Too bad around here, we have miles of rivers, but ZERO water driven
energy. They have new turbins out that you put in rivers and get
some energy. Yeasr ago they did not even think of that. They still
don't.

The problem with rivers is that without a falls, there's no vertical
head to run a high speed turbine or Pelton wheel:
http://en.wikipedia.org/wiki/Pelton_wheel
This is usually solved by building a dam, which has profound
aesthetic, ecological, and environmental issues. It is possible to
use a fully immersed low speed turbine, but to get enough energy from
the usual slow flow rate and high volume river, the number of
turbines and/or their size tend to be large. For example:
http://en.wikipedia.org/wiki/Kaplan_turbine

Also:
http://en.wikipedia.org/wiki/Water_turbine
http://www.homepower.com/basics/hydro/

Another problem is that the power output of the water turbine is
directly proportional to the head and to the flow rate. Unlike the
wind turbine, where the output is proportional to the cube of the air
speed, water power generators tend to become very large at higher
power outputs. Where the flow rate is minimal, the usual solution is
a higher dam.

There are problems with everything. Here is what is being done
tomorrow.

http://www.hydrogreenenergy.com/technology.html

I thinks it allready been planned. These things can be installed near
existing river lock dams which will not affect river traffic.

greg


better to use nuclear powerplants.

--
Jim Yanik
jyanik
at
kua.net

Agreed on that !

Arfa

 

[Arfa Daily]

"Sjouke Burry" <burrynulnulfour@ppllaanneett.nnll> wrote in message
news:4a6f85ce$0$1639$703f8584@textnews.kpn.nl...

David Nebenzahl wrote:
On 7/27/2009 11:26 PM Dave Plowman (News) spake thus:

In article <4a6e47e0$0$7468$822641b3@news.adtechcomputers.com>,
David Nebenzahl <nobody@but.us.chickens> wrote:

[someone else wrote]

A DC generator generates an AC waveform that is mechanically rectified
by the commutator and brushes.
No, an *alternator* does that (which is why it's so called). A
generator just generates plain old DC. Like the ones on old VWs. No
diodes.
The clue is in the commutator. That is a mechanical switch which does
approx. the same as the diodes in an alternator. If the dynamo
intrinsically produced DC it would merely need slip rings as in an
alternator.

What in the world are you talking about? "Mechanical switch"?

The commutator is a set of rotary contacts. My VW (old 6-volt one) had a
generator with a commutator. Produced DC without any diodes.


Wow, A miracle, please show us how!!!
In about fifty years of work in the field, this would be the
first time to see one.

A generator with a commutator i.e. a car dynamo from days of yore, *does*
produce DC, and does it without diodes, courtesy of the switching action of
that commutator. I can't imagine how you've never seen one, as back in the
fifties and sixties - that is fifty years ago - that's about the only type
of generator that was fitted to car engines ...

Arfa

 

[Sjouke Burry]

Arfa Daily wrote:

"Sjouke Burry" <burrynulnulfour@ppllaanneett.nnll> wrote in message
news:4a6f85ce$0$1639$703f8584@textnews.kpn.nl...
David Nebenzahl wrote:
On 7/27/2009 11:26 PM Dave Plowman (News) spake thus:

In article <4a6e47e0$0$7468$822641b3@news.adtechcomputers.com>,
David Nebenzahl <nobody@but.us.chickens> wrote:

[someone else wrote]

A DC generator generates an AC waveform that is mechanically rectified
by the commutator and brushes.
No, an *alternator* does that (which is why it's so called). A
generator just generates plain old DC. Like the ones on old VWs. No
diodes.
The clue is in the commutator. That is a mechanical switch which does
approx. the same as the diodes in an alternator. If the dynamo
intrinsically produced DC it would merely need slip rings as in an
alternator.
What in the world are you talking about? "Mechanical switch"?

The commutator is a set of rotary contacts. My VW (old 6-volt one) had a
generator with a commutator. Produced DC without any diodes.


Wow, A miracle, please show us how!!!
In about fifty years of work in the field, this would be the
first time to see one.

A generator with a commutator i.e. a car dynamo from days of yore, *does*
produce DC, and does it without diodes, courtesy of the switching action of
that commutator. I can't imagine how you've never seen one, as back in the
fifties and sixties - that is fifty years ago - that's about the only type
of generator that was fitted to car engines ...

Arfa


Read the previous response, where he says that the commutator does not

switch (windings).

 

[Arfa Daily]

"Sjouke Burry" <burrynulnulfour@ppllaanneett.nnll> wrote in message
news:4a6f9e20$0$1644$703f8584@textnews.kpn.nl...

Arfa Daily wrote:
"Sjouke Burry" <burrynulnulfour@ppllaanneett.nnll> wrote in message
news:4a6f85ce$0$1639$703f8584@textnews.kpn.nl...
David Nebenzahl wrote:
On 7/27/2009 11:26 PM Dave Plowman (News) spake thus:

In article <4a6e47e0$0$7468$822641b3@news.adtechcomputers.com>,
David Nebenzahl <nobody@but.us.chickens> wrote:

[someone else wrote]

A DC generator generates an AC waveform that is mechanically
rectified
by the commutator and brushes.
No, an *alternator* does that (which is why it's so called). A
generator just generates plain old DC. Like the ones on old VWs. No
diodes.
The clue is in the commutator. That is a mechanical switch which does
approx. the same as the diodes in an alternator. If the dynamo
intrinsically produced DC it would merely need slip rings as in an
alternator.
What in the world are you talking about? "Mechanical switch"?

The commutator is a set of rotary contacts. My VW (old 6-volt one) had
a generator with a commutator. Produced DC without any diodes.


Wow, A miracle, please show us how!!!
In about fifty years of work in the field, this would be the
first time to see one.

A generator with a commutator i.e. a car dynamo from days of yore, *does*
produce DC, and does it without diodes, courtesy of the switching action
of that commutator. I can't imagine how you've never seen one, as back in
the fifties and sixties - that is fifty years ago - that's about the only
type of generator that was fitted to car engines ...

Arfa
Read the previous response, where he says that the commutator does not
switch (windings).

OK. I see what you're getting at. There did seem to be a couple of
statements slightly at odds with one another, one of which you didn't
include. However, the two lines about his VW generator producing DC without
diodes which you did include, is a perfectly reasonable statement, and your
response to it implied (to me at least) that it is not ... Maybe just one
of those 'linguistic' things ... d;~}

Arfa

 

[Jeff Liebermann]

On Tue, 28 Jul 2009 19:05:22 GMT, zekfrivo@zekfrivolous.com (GregS)
wrote:

There are problems with everything.

Backwards. To some people, everything is a problem.

Here is what is being done tomorrow.
http://www.hydrogreenenergy.com/technology.html
greg

Thanks. I didn't know about that one. The usual problem with
submerged turbines in rivers is keeping rubbish, fish, swimmers,
critters, and debris out of the turbines. I don't see any filters,
sediment traps, diverters, grills, etc. I prefer to filet my fish
myself, not to have it done by a turbine. Mechanical feathering for
high flow flood conditions also needs to be addressed. Despite these
problems, hydro has some huge advantages. Of all the common
technologies, it's the cheapest and also the cleanest.

 

[Bart Bervoets]

Now I'm feeling awfull about all the nice big DC motors I,ve thrown away.

Last year i trashed a big comp tape drive, so i know that feeling.
But one would not get me far anyway, i need quite a few.

Bart

 

[Dave Plowman (News)]

In article <jwNbm.77720$XK2.71507@newsfe15.ams2>,
Arfa Daily <arfa.daily@ntlworld.com> wrote:

Read the previous response, where he says that the commutator does not
switch (windings).

OK. I see what you're getting at. There did seem to be a couple of
statements slightly at odds with one another, one of which you didn't
include. However, the two lines about his VW generator producing DC
without diodes which you did include, is a perfectly reasonable
statement, and your response to it implied (to me at least) that it is
not ... Maybe just one of those 'linguistic' things ... d;~}

You need to read the context of the posts. Mr Liebermann originally didn't
realise the commuter in a dynamo does the same job as diodes in an
alternator.

--
*Why is the man who invests all your money called a broker?

Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound.

 

[Arfa Daily]

"Dave Plowman (News)" <dave@davenoise.co.uk> wrote in message
news:508256b72ddave@davenoise.co.uk...

In article <jwNbm.77720$XK2.71507@newsfe15.ams2>,
Arfa Daily <arfa.daily@ntlworld.com> wrote:
Read the previous response, where he says that the commutator does not
switch (windings).

OK. I see what you're getting at. There did seem to be a couple of
statements slightly at odds with one another, one of which you didn't
include. However, the two lines about his VW generator producing DC
without diodes which you did include, is a perfectly reasonable
statement, and your response to it implied (to me at least) that it is
not ... Maybe just one of those 'linguistic' things ... d;~}

You need to read the context of the posts. Mr Liebermann originally didn't
realise the commuter in a dynamo does the same job as diodes in an
alternator.

--
*Why is the man who invests all your money called a broker?

Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound.

I don't think it was Jeff who said that ... ?? Mr Nebenzahl maybe ? The
post is getting a little scruffy in construction here and there. Anyway, if
replying to specific comments, these should still be included or properly
referenced in the reply. You can't rely on people remembering things that
have been said further up the post, particularly when some responses may not
even appear to some people due to filters that they have in place for all of
the crap that finds its way onto here now. Whatever, the couple of lines
that Sjourke did see fit to copy to his response, were valid, and his
comment seemed to laugh at them as being wrong, at least to me. Anyway, I
don't wish to argue with either of you. I've got more important things to
do. If I misunderstood anybody's responses or posts, then I apologise.

Arfa

 

[Dave Plowman (News)]

In article <NGTbm.47409$OM.22038@newsfe06.ams2>,
Arfa Daily <arfa.daily@ntlworld.com> wrote:

You need to read the context of the posts. Mr Liebermann originally
didn't realise the commuter in a dynamo does the same job as diodes in
an alternator.

I don't think it was Jeff who said that ... ?? Mr Nebenzahl maybe ?

A thousand apologies to Mr Liebermann - you're right. Put it down to a
senior moment. I'm getting rather too many of those recently. ;-(

The post is getting a little scruffy in construction here and there.
Anyway, if replying to specific comments, these should still be
included or properly referenced in the reply. You can't rely on people
remembering things that have been said further up the post,
particularly when some responses may not even appear to some people due
to filters that they have in place for all of the crap that finds its
way onto here now. Whatever, the couple of lines that Sjourke did see
fit to copy to his response, were valid, and his comment seemed to
laugh at them as being wrong, at least to me. Anyway, I don't wish to
argue with either of you. I've got more important things to do. If I
misunderstood anybody's responses or posts, then I apologise.

It does get a problem when trying not to just hit reply and quote and fill
the group with unnecessary data. I think any post you have to scroll down
is too long. ;-)

--
*'ome is where you 'ang your @ *

Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound.

 

[Meat Plow]

On Tue, 28 Jul 2009 15:57:02 GMT, zekfrivo@zekfrivolous.com
(GregS)wrote:

In article <30jjk7.prv.19.6@news.alt.net>, Meat Plow <meat@petitmorte.net> wrote:
On Mon, 27 Jul 2009 13:41:17 -0400, Bryce <none@invalid.invalid>wrote:

Meat Plow wrote:

On Sun, 26 Jul 2009 11:26:13 -0400, Bryce <none@invalid.invalid>wrote:

Meat Plow wrote:

On Sat, 25 Jul 2009 20:33:35 +0200, Bart Bervoets
sunnylion@online.be>wrote:

Does anyone have any large permanent magnet motors that could be used to
build a few micro wind turbines?

Bart Bervoets

Find some old DC generators from autos before they started using an
alternator. Don't know what you would use for a prop maybe some custom
thing out of a polymer like a spinner for a child's toy.

A DC generator generates an AC waveform that is mechanically rectified
by the commutator and brushes. Isn't it better to eliminate the comm
and brushes (maintenance and friction losses) and rectify with diodes?
That's what an alternator does, although its field is rotating while
the DC motor/generator field is stationary.

Doesn't an alternator need a voltage on the field to make voltage and
then you regulate the field to regulate the output?

I guess the choice would be up to the OP and his design to store/use
the end product.

An alternator (or, for that matter, a DC generator) need some magnetic
field to sweep windings through. There's usually enough residual
magnetic field in the iron from earlier running to get things started.
The alternator on my standby-power set does this. If the residual
is too small or gone, you gotta "flash" the machine with a brief
current pulse from a storage battery to restore the residual.

Superman would use kryptonite instead.

Yeah I have a 4000 watt standby AC generator that rely's on residual
magnetism. There are two types a brushed type (through which you would
flash the field with a 6 volt lantern battery) and a non-brushed type
that I forget at the moment how you get it going when the residual is
gone. But I can almost 99.9% guaranty you that if I remove the field
connection on my Harley that the alternator would produce zero
volktage.

I fooled with a funny little generator my brother gave me. It had little power.
To get it started it had a separate brushed section to get DC. Push a little
button to get it going.

I'm thinking I want to build a wind generator.

Too bad around here, we have miles of rivers, but ZERO water driven
energy. They have new turbins out that you put in rivers and get
some energy. Yeasr ago they did not even think of that. They still
don't.

greg

I know a farmer who charges his fence charger with a sun panel. Would
be cool to build a waterwheel type charger since he does have a little
stream coming out of a PVC pipe from his pond. The pond has a spring
at one end and always has a decent output. He sometimes has to use
a generator and charger especially in the winter months when sunlight
is scarce. He doesn't want to put up 5 poles to the pasture to provide
AC power to a fence charger but the pond is very near and the stream
runs right through the pasture. Would be a good little project to
design a waterfall turbine at the pipe outlet.

 

[Meat Plow]

On Tue, 28 Jul 2009 10:57:48 -0700, David Nebenzahl
<nobody@but.us.chickens>wrote:

On 7/28/2009 6:27 AM Meat Plow spake thus:

On Tue, 28 Jul 2009 00:20:03 -0700, David Nebenzahl
nobody@but.us.chickens>wrote:

On 7/27/2009 11:26 PM Dave Plowman (News) spake thus:

In article <4a6e47e0$0$7468$822641b3@news.adtechcomputers.com>,
David Nebenzahl <nobody@but.us.chickens> wrote:

[someone else wrote]

A DC generator generates an AC waveform that is mechanically rectified
by the commutator and brushes.

No, an *alternator* does that (which is why it's so called). A generator
just generates plain old DC. Like the ones on old VWs. No diodes.

The clue is in the commutator. That is a mechanical switch which does
approx. the same as the diodes in an alternator. If the dynamo
intrinsically produced DC it would merely need slip rings as in an
alternator.

What in the world are you talking about? "Mechanical switch"?

The commutator is a set of rotary contacts. My VW (old 6-volt one) had a
generator with a commutator. Produced DC without any diodes.

The output voltage at the comm is DC not a 'switched by windings and
com bar AC'.

So you agree that a generator (motor used in reverse, i.e., driven
instead of driving, with a commutator instead of slip rings) produces DC
without rectification, not AC, correct? That was my point.

I'm not disputing that the current direction in a generator reverses
with each set of commutator bars contacted by the brushes, so I guess in
that sense one could consider the commutator a "mechanical switch". I
just regard it as the way the thing is wired to produce DC.

I guess it's a 'thinking out of the box' thing. Seperates the droids
from the go getters.

 

[Jeff Liebermann]

On Wed, 29 Jul 2009 08:24:07 +0100, "Dave Plowman (News)"
<dave@davenoise.co.uk> wrote:

In article <jwNbm.77720$XK2.71507@newsfe15.ams2>,
Arfa Daily <arfa.daily@ntlworld.com> wrote:
Read the previous response, where he says that the commutator does not
switch (windings).

OK. I see what you're getting at. There did seem to be a couple of
statements slightly at odds with one another, one of which you didn't
include. However, the two lines about his VW generator producing DC
without diodes which you did include, is a perfectly reasonable
statement, and your response to it implied (to me at least) that it is
not ... Maybe just one of those 'linguistic' things ... d;~}

You need to read the context of the posts. Mr Liebermann originally didn't
realise the commuter in a dynamo does the same job as diodes in an
alternator.

That wasn't me. If it had been me, I would have:
1. Insulted the original author.
2. Complained about the lack of editing quotes, excessive brevity,
lack of information, lack of writing skills, excessive cross posting,
improper formatting, or various combinations.
3. Explained exactly how things work, even if I were wrong.
4. Supplied URL's to sites that agree with my conjecture.
5. Supplied irrelevant but interesting URL's on related subjects,
such as one does not need a commutator or diodes to generate DC:
<http://en.wikipedia.org/wiki/Homopolar_generator>
6. Supplied a marginally relevant and occasionally entertaining story
from my checkered past[1].
7. Supplied a contorted footnote vainly attempting to either remain
on topic, or somehow partially connect my statements with
sci.electronics.repair.

Since the original allegation does not in any way resemble my standard
style as itemized above, it obviously was not my posting.


[1] Expanding on my college wind generator project.... I went to Cal
Poly Pomona, which believes in "Learn by Doing" which I ammended into
"Learn by Destroying". My degree was in "electrical and electronic
engineering" which at the time involved several classes in motors. One
class was divided into random groups of 4 students. The instructor
then asked "Who has an old automobile generator laying around"? Like
a complete idiot, I raised my hand and our groups was instantly
sentenced to 3 months of hard labour building a wind powered generator
around it. It was suppose to be the reference or worst case design,
as everyone else was allowed to use alternators or PM motors. Ours
worked, sorta. To get enough wind, it was installed in the bed of a
pickup truck, and driven at unsafe speeds down the freeway. A traffic
ticket was avoided by promising never to do it again. That worked for
our group, but failed miserably when some of the other groups had the
same idea. Another lesson learned was that plywood propellers tend to
self destruct at about 50 mph.


"The basic assumption of the repair business is that previously it
actually worked properly. Anything else is re-design or engineering".
(Me after fighting a losing with some piece of badly designed junk).

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

 

[Dave Plowman (News)]

In article <k7p07516v0aiso5disua4jlqv9ctu2lh0v@4ax.com>,
Jeff Liebermann <jeffl@cruzio.com> wrote:

You need to read the context of the posts. Mr Liebermann originally
didn't realise the commuter in a dynamo does the same job as diodes in
an alternator.

That wasn't me.

Indeed - I'm sorry. I apologised in a later post.

--
*I have a degree in liberal arts -- do you want fries with that

Dave Plowman dave@davenoise.co.uk London SW
To e-mail, change noise into sound.

 

[JB]

"Bart Bervoets" <sunnylion@online.be> wrote in message
news:4a6f09a4$0$2853$ba620e4c@news.skynet.be...

If you look on ebay you'll see many used treadmill PMDC motors
sold for this use.

Yes, so i now noticed, there are some solutions but alas a bit bulky.
I did some research already and have experimented with car alternators,
i got so far i can make one that charges at 400rpm but the wind is
too unpredictable and the field coil needs to be energized all the time
which drains your battery in dead moments, rather a pm alternator as
suggested as i don't feel much for having to build a dynamo from start,
but hey, if i have to...
But i did buy some motors on ebay as suggested, they are treadmill
motors.
Someone else suggested the use of a motor off an electrical bicycle,
benefit is that it's weatherproof.
I just thought someone here could sell me some instead
of on eekbay.
What i would like is an easy off the shelf solution, but i can see
that there isn't really one.
Thanks everybody for the input on this.

Bart

You can find them on Sam's Club website 400W for $600

 

[Alain]

here:
http://www.thebackshed.com/Windmill/assemblyMini1.asp
and better i think:

http://hackedgadgets.com/2008/12/05/fisher-paykel-smart-drive-washing-machine-wind-generator/
http://www.watchtv.net/~rburmeister/smart.html
http://www.yourgreendream.com/diy_fp_remove_from_wm.php
http://www.ecoinnovation.co.nz/p-349-whirlpool-conversion-parts-to-fit-smart-drive-bearing-block-and-shaft.aspx
http://www.ecoinnovation.co.nz/p-348-lg-conversion-parts-to-fit-smart-drive-bearing-block-and-shaft.aspx

Alain


"Bart Bervoets" <sunnylion@online.be> a écrit dans le message de news:
4a6b4ffa$0$2850$ba620e4c@news.skynet.be...

Does anyone have any large permanent magnet motors that could be used to
build a few micro wind turbines?

Bart Bervoets

 

[Blarp]

On Mon, 10 Aug 2009 23:12:36 +0200, "Alain" <f1jfp@laposte.net> wrote:

here:
http://www.thebackshed.com/Windmill/assemblyMini1.asp
and better i think:

http://hackedgadgets.com/2008/12/05/fisher-paykel-smart-drive-washing-machine-wind-generator/
http://www.watchtv.net/~rburmeister/smart.html
http://www.yourgreendream.com/diy_fp_remove_from_wm.php
http://www.ecoinnovation.co.nz/p-349-whirlpool-conversion-parts-to-fit-smart-drive-bearing-block-and-shaft.aspx
http://www.ecoinnovation.co.nz/p-348-lg-conversion-parts-to-fit-smart-drive-bearing-block-and-shaft.aspx

Alain


"Bart Bervoets" <sunnylion@online.be> a écrit dans le message de news:
4a6b4ffa$0$2850$ba620e4c@news.skynet.be...
Does anyone have any large permanent magnet motors that could be used to
build a few micro wind turbines?

Bart Bervoets

Never tried it, but the brushless outrunners used e.g. in model RC
planes might work, specially high KV units (hi torque, low rpm).
Basically these are 3 phase stepping motors, but with some rectifying
it could owrk. And they are getting rather cheap too.