Scott's efficient DC motor

[gmeast]

Hi all,

Has anyone heard of or know if this motor is being discussed anywhere?  I know this guy but haven't heard from him in years ... I think he hates me.  He built one of his early motors in my shop a couple of decades ago. 

WOW! Nice to see he got a patent on it.  It issued May 7, 1996.  It looks like it's still in force ... cool!

From the Patent:
http://02d1852.netsolhost.com/plasma/goss1.jpg

Anyway this is the patent number for his motor:
5,514,923

Get it at the USPTO's website.

You'll need the compatible TIFF plugin like AlterniTIFF to view all of the patent pages (images):
http://www.alternatiff.com/

Here's the USPTO's link:
http://www.uspto.gov/

Here's the USPTO link to his patent:
http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=1&f=G&l=50&co1=AND&d=PTXT&s1=5,514,923.PN.&OS=PN/5,514,923&RS=PN/5,514,923

The site is free.  The plugin is free.  You can download the patents for free ... only problem is the "free" TIFF plugins only allow you to save one page at a time ... SO WHAT ... free is free and that's worth a little time waiting.  I know I've been told my time isn't worth SQUAT ... and I believe it.

Fun.  Cheers,

Greg

[gyulasun]

Hi Greg,

You may wish to use this link for downloading US patents in pdf files:
http://www.pat2pdf.org/   only need to know and enter the patent number.

Very interesting patent, and reminds me to Garry Stanley pulse motor too. He built it in the years 2001-2002 or so and claimed a COP of 1.6 for it. He also had 12 facing magnet pairs in attraction mode (Neo 18mm OD, 5mm thick) on a double rotor disk and used also 12 pair of flat coils, as stators, each coil had a 3-4mm thickness, he took them out from old 5 1/4 floppy drives.
Each coil pair consisted of two parallel connected pancake-like air core coils, sandwiched next to each other and these coil pairs could pass between the rotor magnet pairs.  However, Garry did not offset the coils and magnets with respect to each other: all the coils were approached by the magnet pairs at the same time. He used a simple reed switch for controlling a power transistor to switch all the coils on and off, he used attraction polarity for the coils to pull the rotor magnet pairs towards them till position TDC, then coil current was switched off.
I wonder if you are aware of this? Unfortunataly Garry finished running his website in 2005 but his yahoo mail group still have the pictures and descriptions, though not active any more.
I wonder if you consider the patent you refer to as a design with COP>1?

Thanks,  Gyula

[gmeast]

Hi all,

Has anyone heard of or know if this motor is being discussed anywhere?  I know this guy but haven't heard from him in years ... I think he hates me.  He built one of his early motors in my shop a couple of decades ago.

WOW! Nice to see he got a patent on it.  It issued May 7, 1996.  It looks like it's still in force ... cool!

Anyway this is the patent number for his motor:
5,514,923

Here's the USPTO link to his patent (text only):
United States Patent: 5514923

Get it at the USPTO's website.  Here's the link:
United States Patent and Trademark Office

I know most everyone has their favorite site to view and download patents but here's what I use:

You'll need the compatible TIFF plugin like AlterniTIFF to view all of the patent pages (images):
AlternaTIFF TIFF Plug-in

The site is free.  The plugin is free.  You can download the patents for free ... only problem is the "free" TIFF plugins only allow you to save one page at a time ... SO WHAT ... free is free and that's worth a little time waiting.  I know I've been told my time isn't worth SQUAT ... and I believe it.

Fun.  Cheers,

Greg

[jadaro2600]

Hi all,

Has anyone heard of or know if this motor is being discussed anywhere?  I know this guy but haven't heard from him in years ... I think he hates me.  He built one of his early motors in my shop a couple of decades ago.

WOW! Nice to see he got a patent on it.  It issued May 7, 1996.  It looks like it's still in force ... cool!

Anyway this is the patent number for his motor:
5,514,923

Here's the USPTO link to his patent (text only):
United States Patent: 5514923

Get it at the USPTO's website.  Here's the link:
United States Patent and Trademark Office

I know most everyone has their favorite site to view and download patents but here's what I use:

You'll need the compatible TIFF plugin like AlterniTIFF to view all of the patent pages (images):
AlternaTIFF TIFF Plug-in

The site is free.  The plugin is free.  You can download the patents for free ... only problem is the "free" TIFF plugins only allow you to save one page at a time ... SO WHAT ... free is free and that's worth a little time waiting.  I know I've been told my time isn't worth SQUAT ... and I believe it.

Fun.  Cheers,

Greg

I would recommend this site over the others any day - the interface is straight forward, and the patents are available in PDF format already, no tiff plug-in required.

http://www.freepatentsonline.com/  account is free and I never hear from them.

[woopy]

Hi Greg

i follow your work since a long time on an other Forum  and i am happy that you bring this motor idea here .

Perhaps you have seen the Ossie motor thread where i posted my contribution with a sandwitch rotor  very similar to the Scott' s one.

So far i remember you made really usefull work with your water fuel car as we name it here in europe " la coccinelle" the VW .

But back to what is interesting here.

I intend to make a bigger Scott/ Ossie / pancake / Lynch/  motor to power my Ultralight flying machine .

Untill now the best one i got is the Geiger motor with a 90 % efficiency   very high   do you think we can do better with the Scott.

What seems to be good is that we could use a greater diameter so more torque and perhaps more accuracy from the coils pulse and BEMF recup.

What i need  to work on , is 15 KW at 1200 rpm   with basic lipo battery at 56 volts (or more ) and 40 ah.

What do you think ?

rergards

Laurent