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Jul 14, 2005, 08:11 AM
Ron van Sommeren
Ron van Sommeren
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lovely diy outrunner


This message from "Ron van Sommeren" <[email protected]> brought to you by EFLIGHT!

Goedendag ;-)

A lovely diy outrunner, made by Holger Lambertus from Germany. The
hammerheads are in contact with the frontplate, could even give better
statorcooling:
http://slope-combat.de/temp/dw8_1.jpg
http://slope-combat.de/temp/dw8_2.jpg
http://slope-combat.de/temp/dw8_3.jpg
http://slope-combat.de/temp/dw8_4.jpg

Vriendelijke groeten ;-) Ron van Sommeren
near Nijmegen, the Netherlands



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Jul 14, 2005, 10:11 AM
GILLES FIREAGLE
GILLES FIREAGLE
Guest

Re: lovely diy outrunner


This message from GILLES FIREAGLE <[email protected]> brought to you by EFLIGHT!

Mr. Sommeren, Guten Morgen!

Interesting design. A bit confusing to this simple
retiree.

Are we seeing the propeller shaft? I will assume not,
since the out-leads are attached to the "backplate?".

Could the shaft be some sort of alternative mounting
device? If so, and I notice a needle or ball-bearing,
then where would be the stationary component of the
motor?

Or is this a special design for pusher propellers
only? Despite my best effort, I do not see where the
cooling advantge will come from, if indeed the shaft
shown is a propellor shaft.

Perhaps, the manufacturer may elucidate?

Danke,

Gilles Fireagle
Florida, USA

I admit to my "GI German". No excuse really, as I was
married to a 1/2 German [Austrian?] lady, name of
Schuck, for a while.

I did notice the "van" and I will assume you are from
a "low country".



--- Ron van Sommeren <[email protected]>
wrote:

> This message from "Ron van Sommeren"
> <[email protected]> brought to you by
> EFLIGHT!
>
> Goedendag ;-)
>
> A lovely diy outrunner, made by Holger Lambertus
> from Germany. The
> hammerheads are in contact with the frontplate,
> could even give better
> statorcooling:
> http://slope-combat.de/temp/dw8_1.jpg
> http://slope-combat.de/temp/dw8_2.jpg
> http://slope-combat.de/temp/dw8_3.jpg
> http://slope-combat.de/temp/dw8_4.jpg
>
> Vriendelijke groeten ;-) Ron van Sommeren
> near Nijmegen, the Netherlands
>
>
>
> *** Any complaints or problems? Send an email to
> [email protected]
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>





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Jul 14, 2005, 02:11 PM
Jim K
Jim K
Guest

Re: lovely diy outrunner


This message from Jim K <[email protected]eoplepc.com> brought to you by EFLIGHT!

Gilles -

The can is attached to the shaft. The front plate (the grey casting with the threaded hole is the stator mount - you attach this to the plane. Notice the bearing between the shaft and the front plate.

-----Original Message-----
From: GILLES FIREAGLE <[email protected]>

Are we seeing the propeller shaft? I will assume not,
since the out-leads are attached to the "backplate?".

Could the shaft be some sort of alternative mounting
device? If so, and I notice a needle or ball-bearing,
then where would be the stationary component of the
motor?

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Jul 14, 2005, 04:11 PM
Ron van Sommeren
Ron van Sommeren
Guest

Re: lovely diy outrunner


This message from "Ron van Sommeren" <[email protected]> brought to you by EFLIGHT!

Goedendag Gilles, Jim and all,

In this type of motor, the can rotates, hence 'outrunner', it's a normal brushless motor turned inside out. If you want to learn more about these outrunner motors, read the original diy articles featured in the German Elektro Modell magazines (2000-2001) at the bottom of this page:
www.torcman.de/peterslrk/index_eng.html (English version)

I don't think the front plate is cast (it's a diy motor), it's some kind of surface treatment. Another beautiful example with a similar (less coarse?) surface treatment, wish I had four wheels like that under my Toyota ;-)
http://www.lipoly.de/modellbau/motor...0_8/index.html

Animations and simulations:
https://www.rcgroups.com/forums/showthread.php?t=216928

Meanwhile there are over 60 manufacturers of this kind of motor (motor kits too), a list:
http://www.rclineforum.de/forum/thre...threadid=43664

Indeed I'm from a (the?) low country: the Netherlands. I live about 30km from the German border. So it's 'goedendag' instead of 'guten Tag':
http://home.hetnet.nl/~ronvans/

Vriendelijke groeten ;-) Ron van Sommeren
near Nijmegen, the Netherlands

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Jul 15, 2005, 12:11 AM
J Keller
J Keller
Guest

Re: lovely diy outrunner


This message from J Keller <[email protected]> brought to you by EFLIGHT!

Ron van Sommeren wrote:

>This message from "Ron van Sommeren" <[email protected]> brought to you by EFLIGHT!
>
>Goedendag Gilles, Jim and all,
>
>In this type of motor, the can rotates, hence 'outrunner', it's a normal brushless motor turned inside out. If you want to learn more about these outrunner motors, read the original diy articles featured in the German Elektro Modell magazines (2000-2001) at the bottom of this page:
>www.torcman.de/peterslrk/index_eng.html (English version)
>
>I don't think the front plate is cast (it's a diy motor), it's some kind of surface treatment. Another beautiful example with a similar (less coarse?) surface treatment, wish I had four wheels like that under my Toyota ;-)
>http://www.lipoly.de/modellbau/motor...0_8/index.html
>
>Animations and simulations:
>https://www.rcgroups.com/forums/showthread.php?t=216928
>
>Meanwhile there are over 60 manufacturers of this kind of motor (motor kits too), a list:
>http://www.rclineforum.de/forum/thre...threadid=43664
>
>Indeed I'm from a (the?) low country: the Netherlands. I live about 30km from the German border. So it's 'goedendag' instead of 'guten Tag':
>http://home.hetnet.nl/~ronvans/
>
>Vriendelijke groeten ;-) Ron van Sommeren
>near Nijmegen, the Netherlands
>
>--- StripMime Report -- processed MIME parts ---
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> text/html
>---
>
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>
>
>
>

It would be a whole lot cheaper to do a sand casting (which is what it
looks like) for the front plate, then a few minutes on a lathe to
machine the main bearing bore and to drill and thread the mounting
holes. My bet is that this part was transferred from a production motor
that was made that way.

I could be wrong, but I don't think so (words from Charles Barkley's book).


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Jul 15, 2005, 12:11 AM
GILLES FIREAGLE
GILLES FIREAGLE
Guest

Re: lovely diy outrunner


This message from GILLES FIREAGLE <[email protected]> brought to you by EFLIGHT!

Went through several manufacturer's outrunner
offerings. I examined mine. Still I cannot see what
the shaft is for.

Unless we are talking of a "run of the mill"
outrunner, in which case..."No further questions"!

Gilles

--- J Keller <[email protected]> wrote:

> This message from J Keller <[email protected]>
> brought to you by EFLIGHT!
>
> Ron van Sommeren wrote:
>
> >This message from "Ron van Sommeren"

> <[email protected]> brought to you by
> EFLIGHT!
> >
> >Goedendag Gilles, Jim and all,
> >
> >In this type of motor, the can rotates, hence

> 'outrunner', it's a normal brushless motor turned
> inside out. If you want to learn more about these
> outrunner motors, read the original diy articles
> featured in the German Elektro Modell magazines
> (2000-2001) at the bottom of this page:
> >www.torcman.de/peterslrk/index_eng.html (English

> version)
> >
> >I don't think the front plate is cast (it's a diy

> motor), it's some kind of surface treatment. Another
> beautiful example with a similar (less coarse?)
> surface treatment, wish I had four wheels like that
> under my Toyota ;-)
>
>http://www.lipoly.de/modellbau/motor...0_8/index.html
> >
> >Animations and simulations:

>
>https://www.rcgroups.com/forums/showthread.php?t=216928
> >
> >Meanwhile there are over 60 manufacturers of this

> kind of motor (motor kits too), a list:
> >http://www.rclineforum.de/forum/thre...threadid=43664
> >
> >Indeed I'm from a (the?) low country: the

> Netherlands. I live about 30km from the German
> border. So it's 'goedendag' instead of 'guten Tag':
> >http://home.hetnet.nl/~ronvans/
> >
> >Vriendelijke groeten ;-) Ron van Sommeren
> >near Nijmegen, the Netherlands
> >
> >--- StripMime Report -- processed MIME parts ---
> >multipart/alternative
> > text/plain (text body -- kept)
> > text/html
> >---
> >
> >*** Any complaints or problems? Send an email to

> [email protected]
> >*** For help with list commands go to

> http://www.ezonemag.com/pages/mailhelp.htm
> >*** For the list rules go to

> http://www.ezonemag.com/pages/mailrule.htm
> >
> >
> >
> >

> It would be a whole lot cheaper to do a sand casting
> (which is what it
> looks like) for the front plate, then a few minutes
> on a lathe to
> machine the main bearing bore and to drill and
> thread the mounting
> holes. My bet is that this part was transferred
> from a production motor
> that was made that way.
>
> I could be wrong, but I don't think so (words from
> Charles Barkley's book).
>
>
> *** Any complaints or problems? Send an email to
> [email protected]
> *** For help with list commands go to
> http://www.ezonemag.com/pages/mailhelp.htm
> *** For the list rules go to
> http://www.ezonemag.com/pages/mailrule.htm
>



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Jul 15, 2005, 08:11 AM
John Swetland
John Swetland
Guest

Re: lovely diy outrunner


This message from "John Swetland" <[email protected]> brought to you by EFLIGHT!

> Went through several manufacturer's outrunner
> offerings. I examined mine. Still I cannot see what
> the shaft is for.


Being the shaft is connected to the rotor can, I'd mount a prop on it and
mount the stator to an airframe.

John S.


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Jul 15, 2005, 12:11 PM
Jim K
Jim K
Guest

Re: lovely diy outrunner


This message from Jim K <[email protected]> brought to you by EFLIGHT!

Just repeat after me:

"The prop goes on the shaft"

"The prop goes on the shaft"

"The prop goes on the shaft"

"The prop goes on the shaft"

-----Original Message-----
From: GILLES FIREAGLE <[email protected]>
Sent: Jul 14, 2005 9:48 PM
To: [email protected]
Subject: Re: [EFLT] lovely diy outrunner

This message from GILLES FIREAGLE <[email protected]> brought to you by EFLIGHT!

Went through several manufacturer's outrunner
offerings. I examined mine. Still I cannot see what
the shaft is for.

Unless we are talking of a "run of the mill"
outrunner, in which case..."No further questions"!

Gilles

--- J Keller <[email protected]> wrote:

> This message from J Keller <[email protected]>
> brought to you by EFLIGHT!
>
> Ron van Sommeren wrote:
>
> >This message from "Ron van Sommeren"

> <[email protected]> brought to you by
> EFLIGHT!
> >
> >Goedendag Gilles, Jim and all,
> >
> >In this type of motor, the can rotates, hence

> 'outrunner', it's a normal brushless motor turned
> inside out. If you want to learn more about these
> outrunner motors, read the original diy articles
> featured in the German Elektro Modell magazines
> (2000-2001) at the bottom of this page:
> >www.torcman.de/peterslrk/index_eng.html (English

> version)
> >
> >I don't think the front plate is cast (it's a diy

> motor), it's some kind of surface treatment. Another
> beautiful example with a similar (less coarse?)
> surface treatment, wish I had four wheels like that
> under my Toyota ;-)
>
>http://www.lipoly.de/modellbau/motor...0_8/index.html
> >
> >Animations and simulations:

>
>https://www.rcgroups.com/forums/showthread.php?t=216928
> >
> >Meanwhile there are over 60 manufacturers of this

> kind of motor (motor kits too), a list:
> >http://www.rclineforum.de/forum/thre...threadid=43664
> >
> >Indeed I'm from a (the?) low country: the

> Netherlands. I live about 30km from the German
> border. So it's 'goedendag' instead of 'guten Tag':
> >http://home.hetnet.nl/~ronvans/
> >
> >Vriendelijke groeten ;-) Ron van Sommeren
> >near Nijmegen, the Netherlands
> >
> >--- StripMime Report -- processed MIME parts ---
> >multipart/alternative
> > text/plain (text body -- kept)
> > text/html
> >---
> >
> >*** Any complaints or problems? Send an email to

> [email protected]
> >*** For help with list commands go to

> http://www.ezonemag.com/pages/mailhelp.htm
> >*** For the list rules go to

> http://www.ezonemag.com/pages/mailrule.htm
> >
> >
> >
> >

> It would be a whole lot cheaper to do a sand casting
> (which is what it
> looks like) for the front plate, then a few minutes
> on a lathe to
> machine the main bearing bore and to drill and
> thread the mounting
> holes. My bet is that this part was transferred
> from a production motor
> that was made that way.
>
> I could be wrong, but I don't think so (words from
> Charles Barkley's book).
>
>
> *** Any complaints or problems? Send an email to
> [email protected]
> *** For help with list commands go to
> http://www.ezonemag.com/pages/mailhelp.htm
> *** For the list rules go to
> http://www.ezonemag.com/pages/mailrule.htm
>



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Jul 15, 2005, 04:11 PM
Ron van Sommeren
Ron van Sommeren
Guest

Re: lovely diy outrunner


This message from "Ron van Sommeren" <[email protected]> brought to you by EFLIGHT!

Goedendag all,

Gilles wrote,
> Unless we are talking of a "run of the mill" outrunner

Yes, with a frontplate diameter smaller than the diameter of the flux ring (can), that's all there is to it.

Jim Keller wrote:
> It would be a whole lot cheaper to do a sand casting

Is this something one can diy at home? Would be nice :-) I was thinking it could be (coarse) sand blasted.

Vriendelijke groeten ;-) Ron van Sommeren
http://home.hetnet.nl/~ronvans/
near Nijmegen, the Netherlands


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Jul 15, 2005, 06:11 PM
GILLES FIREAGLE
GILLES FIREAGLE
Guest

Re: lovely diy outrunner


This message from GILLES FIREAGLE <[email protected]> brought to you by EFLIGHT!

OK, Dr. Sommeren!

I see it now. With the smaller non-rotating part, the
airflow through the "coils" is indeed enhanced.

If the shaft is the prop or [alternatively] the
gearbox attachment shaft, it makes it a pusher only
design. As far as I can see.

What I am really looking for, from the younger
engineers, is the "great leap forward" that reduces
the big weak point of the outrunner design. The short
moment arm on the bearings. This shortcoming was what
did in the French Rhone engine [the real thing] of WW1
vintage.

The advantage of the outrunner design is the cooling.
Its huge disadvantage is the weak load bearing anchor.
Imagine a "wet" 60 engine relying on one bearing. Or
a Porsche with the engine rotating and being held on
by a six inch spacing between the needle bearings!

Do you know of any outrunner designs in industrial
applications? I see that in the smaller sizes with
the concommitantly lower rotational mass, there is
sufficient bearing area to maintain integrity.

All of this is very interesting from this long retired
aeronautical - pre astronautical - engineer!

Guten Tag!

Gilles Fireagle


--- Ron van Sommeren <[email protected]>
wrote:

> This message from "Ron van Sommeren"
> <[email protected]> brought to you by
> EFLIGHT!
>
> Goedendag all,
>
> Gilles wrote,
> > Unless we are talking of a "run of the mill"

> outrunner
> Yes, with a frontplate diameter smaller than the
> diameter of the flux ring (can), that's all there is
> to it.
>
> Jim Keller wrote:
> > It would be a whole lot cheaper to do a sand

> casting
> Is this something one can diy at home? Would be nice
> :-) I was thinking it could be (coarse) sand
> blasted.
>
> Vriendelijke groeten ;-) Ron van Sommeren
> http://home.hetnet.nl/~ronvans/
> near Nijmegen, the Netherlands
>
>
> --- StripMime Report -- processed MIME parts ---
> multipart/alternative
> text/plain (text body -- kept)
> text/html
> ---
>
> *** Any complaints or problems? Send an email to
> [email protected]
> *** For help with list commands go to
> http://www.ezonemag.com/pages/mailhelp.htm
> *** For the list rules go to
> http://www.ezonemag.com/pages/mailrule.htm
>



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Jul 15, 2005, 06:11 PM
Jim K
Jim K
Guest

Re: lovely diy outrunner


This message from Jim K <[email protected]> brought to you by EFLIGHT!

The outrunner design is not a single bearing setup. The shaft is supported by two bearings - one at the front of the stator (the non-rotating part with the windings) and one at the rear. You can't see the second bearing because it's totally enclosed.

Industrial applications for outrunners? Hmmmm, let's see, there's CD drives, DVD drives, tape backup drives, printers, copiers, etc., etc., etc.

BTW. Porsche abandoned the roller (not needle) bearing crankshafts for it's production cars in the middle '50's, continuing that design only for race cars. There was nothing inherently wrong with the approach, except that unknowing drivers would lug their engines (high load at low RPM), causing premature fatigue failure of the bearings. Notwithstanding, the four cylinder Porsche boxer (being based on the Volkswagen design of Ing. Dr. Ferdinand Porsche) was inherently a three main bearing motor even through the 912 in both its incarnations. There was a fourth main bearing, but it only had to support a minor load of the cam gear drive and the oil pump inside the timing case. I would dare say that over 90% of all Porsche 4 bangers suffered from cracked crankshafts - my '61 included, though not all resulted in catastrophic failure. (I saved my original crank just in case some miracle cure/repair process came along. That was in 1980, and it still isn't here!!). VW's, being significantly lower power, didn't typically face the same demise.

-----Original Message-----
From: GILLES FIREAGLE <[email protected]>
Sent: Jul 15, 2005 2:28 PM
To: [email protected]
Subject: Re: [EFLT] lovely diy outrunner

This message from GILLES FIREAGLE <[email protected]> brought to you by EFLIGHT!

OK, Dr. Sommeren!

I see it now. With the smaller non-rotating part, the
airflow through the "coils" is indeed enhanced.

If the shaft is the prop or [alternatively] the
gearbox attachment shaft, it makes it a pusher only
design. As far as I can see.

What I am really looking for, from the younger
engineers, is the "great leap forward" that reduces
the big weak point of the outrunner design. The short
moment arm on the bearings. This shortcoming was what
did in the French Rhone engine [the real thing] of WW1
vintage.

The advantage of the outrunner design is the cooling.
Its huge disadvantage is the weak load bearing anchor.
Imagine a "wet" 60 engine relying on one bearing. Or
a Porsche with the engine rotating and being held on
by a six inch spacing between the needle bearings!

Do you know of any outrunner designs in industrial
applications? I see that in the smaller sizes with
the concommitantly lower rotational mass, there is
sufficient bearing area to maintain integrity.

All of this is very interesting from this long retired
aeronautical - pre astronautical - engineer!

Guten Tag!

Gilles Fireagle


--- Ron van Sommeren <[email protected]>
wrote:

> This message from "Ron van Sommeren"
> <[email protected]> brought to you by
> EFLIGHT!
>
> Goedendag all,
>
> Gilles wrote,
> > Unless we are talking of a "run of the mill"

> outrunner
> Yes, with a frontplate diameter smaller than the
> diameter of the flux ring (can), that's all there is
> to it.
>
> Jim Keller wrote:
> > It would be a whole lot cheaper to do a sand

> casting
> Is this something one can diy at home? Would be nice
> :-) I was thinking it could be (coarse) sand
> blasted.
>
> Vriendelijke groeten ;-) Ron van Sommeren
> http://home.hetnet.nl/~ronvans/
> near Nijmegen, the Netherlands
>
>
> --- StripMime Report -- processed MIME parts ---
> multipart/alternative
> text/plain (text body -- kept)
> text/html
> ---
>
> *** Any complaints or problems? Send an email to
> [email protected]
> *** For help with list commands go to
> http://www.ezonemag.com/pages/mailhelp.htm
> *** For the list rules go to
> http://www.ezonemag.com/pages/mailrule.htm
>



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Jul 15, 2005, 10:11 PM
J Keller
J Keller
Guest

Re: lovely diy outrunner


This message from J Keller <[email protected]> brought to you by EFLIGHT!

Jim Keller wrote:

>>It would be a whole lot cheaper to do a sand casting
>>
>>

>Is this something one can diy at home? Would be nice :-) I was thinking it could be (coarse) sand blasted.
>
>


>A sand casting at home? I don't think so, unless you have a way to melt aluminum and a way to prepare a mold. This is not rocket science, but it requires some training, some discipline, and a whole lot of experience.
>
>



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Jul 16, 2005, 10:11 AM
Peter Seddon
Peter Seddon
Guest

Re: lovely diy outrunner


This message from "Peter Seddon" <[email protected]> brought to you by EFLIGHT!

Outrunners as a principle have been used by the machine tool industry with
coreless rotors to get the lowest possible inertia (I think Kollmorgen made
them). I am sure there are other specialised applications (eg the military)
where they are used.

Is an outrunner better from a cooling standpoint when the windings are
inside the case. With an 'in runner' the windings are in contact with the
outer shell which means heat transfer to that surface is good and hence
external cooling easier?

Regards Peter


----- Original Message -----
From: "GILLES FIREAGLE" <[email protected]>
To: <[email protected]>
Sent: Friday, July 15, 2005 10:28 PM
Subject: Re: [EFLT] lovely diy outrunner


> This message from GILLES FIREAGLE <[email protected]> brought to you by
> EFLIGHT!
>
> OK, Dr. Sommeren!
>
> I see it now. With the smaller non-rotating part, the
> airflow through the "coils" is indeed enhanced.
>
> If the shaft is the prop or [alternatively] the
> gearbox attachment shaft, it makes it a pusher only
> design. As far as I can see.
>
> What I am really looking for, from the younger
> engineers, is the "great leap forward" that reduces
> the big weak point of the outrunner design. The short
> moment arm on the bearings. This shortcoming was what
> did in the French Rhone engine [the real thing] of WW1
> vintage.
>
> The advantage of the outrunner design is the cooling.
> Its huge disadvantage is the weak load bearing anchor.
> Imagine a "wet" 60 engine relying on one bearing. Or
> a Porsche with the engine rotating and being held on
> by a six inch spacing between the needle bearings!
>
> Do you know of any outrunner designs in industrial
> applications? I see that in the smaller sizes with
> the concommitantly lower rotational mass, there is
> sufficient bearing area to maintain integrity.
>
> All of this is very interesting from this long retired
> aeronautical - pre astronautical - engineer!
>
> Guten Tag!
>
> Gilles Fireagle
>
>
> --- Ron van Sommeren <[email protected]>
> wrote:
>
>> This message from "Ron van Sommeren"
>> <[email protected]> brought to you by
>> EFLIGHT!
>>
>> Goedendag all,
>>
>> Gilles wrote,
>> > Unless we are talking of a "run of the mill"

>> outrunner
>> Yes, with a frontplate diameter smaller than the
>> diameter of the flux ring (can), that's all there is
>> to it.
>>
>> Jim Keller wrote:
>> > It would be a whole lot cheaper to do a sand

>> casting
>> Is this something one can diy at home? Would be nice
>> :-) I was thinking it could be (coarse) sand
>> blasted.
>>
>> Vriendelijke groeten ;-) Ron van Sommeren
>> http://home.hetnet.nl/~ronvans/
>> near Nijmegen, the Netherlands
>>
>>
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>
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Jul 18, 2005, 08:11 AM
Ron van Sommeren
Ron van Sommeren
Guest

Re: lovely diy outrunner


This message from "Ron van Sommeren" <[email protected]> brought to you by EFLIGHT!

Goedendag all,

Gilles Fireagle wrote:
>What I am really looking for, from the younger
> engineers, is the "great leap forward" that reduces
> the big weak point of the outrunner design. The short
> moment arm on the bearings.


Outrunners with triple ball bearings, I guess the extra ball bearing is for
supporting the normally 'free hanging' side of the rotating can:
'Triton TM 350' , www.torcman.de/index_e.htm
'Orbit' range from www.plettenberg-motoren.com
http://www.plettenberg-motoren.com/Orbit30/Orbit30.htm
'Kora' range from
http://www.kontronik.de/mbuerstenlosaussen2005e.htm

'Triplex' range from www.high-torque.com
<http://www.handlaunchglider.de/catalog/product_info.php?cPath=62_85&products_id=17043&osC sid=0bddbfd6a169c3f547b5e0a7b1c5a94f>

Christian Lucas', the 'L' in lrk who's the main culprit for the growing
popularity of outrunners, he made the original design, works for
www.magnetmotor.de, they also produce outrunners for vehicles
Outrunners in cars and busses:
http://www2.rnw.nl/rnw/en/features/s...1215wheel.html

The 'Lynch' motor is not an outrunner but it has the 'pancake style'
dimensions for greater torque:
http://www.solarnavigator.net/lynch_motor.htm

Motor for solar powered vehicle:
http://www.tip.csiro.au/Machines/papers/iwscem/

> The advantage of the outrunner design is the cooling.

It's in the coils (resistance) and stator (eddy currents and hysteris loses)
that heat is produced. Inrunners have an advantage because the coils are on
the outside. However, in outrunners the magnets are on the outside. So, in a
temperature critical situation, in an outrunner the magnets are at danger
just after shutting down the motor (lots of thermal energy stored in the
stator) whereas in an inrunner the magnets are at danger during operation.
This is just a theory of mine, sounds plausible.

Vriendelijke groeten ;-) Ron van Sommeren
near Nijmegen, the Netherlands


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