I remember reading a book about motors, and one of the more interesting ones was referred to as a "Printed Pole Motor" IIRC.

This motor had multiple salient poles on the rotor, and they could be re-magnetized as they passed one location of the stator.
This allowed the pole count of the rotor to be dynamically changed by re-printing some of the salient poles to create larger or smaller groups of North or South poles in succession around the rotor.

I think they were intended for very large motors for ball mills or some large mining operations, of low speed, and thus many poles around the rotors.
Also, it was suggested that since the poles could be re-written as the motor ran, there could be theoretically non-integer numbers of poles around the rotor, as they could be dynamically printed to match the required speed.

Google cannot find any information on this...

Did I forget the actual name of this class of motor?

On 9/23/2012 11:12 AM, Cross-Slide wrote:
I remember reading a book about motors, and one of the more interesting ones was referred to as a "Printed Pole Motor" IIRC.

This motor had multiple salient poles on the rotor, and they could be re-magnetized as they passed one location of the stator.
This allowed the pole count of the rotor to be dynamically changed by re-printing some of the salient poles to create larger or smaller groups of North or South poles in succession around the rotor.

I think they were intended for very large motors for ball mills or some large mining operations, of low speed, and thus many poles around the rotors.
Also, it was suggested that since the poles could be re-written as the motor ran, there could be theoretically non-integer numbers of poles around the rotor, as they could be dynamically printed to match the required speed.

Google cannot find any information on this...

Did I forget the actual name of this class of motor?
About 30 years ago, I saw, at a trade show, a UPS based on a flywheel.
They claimed that they printed the poles dynamically so you got
60Hz out independent of flywheel speed.

On Sun, 23 Sep 2012 11:12:22 -0700, Cross-Slide wrote:

I remember reading a book about motors, and one of the more interesting
ones was referred to as a "Printed Pole Motor" IIRC.

This motor had multiple salient poles on the rotor, and they could be
re-magnetized as they passed one location of the stator.
This allowed the pole count of the rotor to be dynamically changed by
re-printing some of the salient poles to create larger or smaller groups
of North or South poles in succession around the rotor.

I think they were intended for very large motors for ball mills or some
large mining operations, of low speed, and thus many poles around the
rotors.
Also, it was suggested that since the poles could be re-written as the
motor ran, there could be theoretically non-integer numbers of poles
around the rotor, as they could be dynamically printed to match the
required speed.

Google cannot find any information on this...

Did I forget the actual name of this class of motor?

Sounds wacky; I've never heard of it.

Dunno how it'd work with rare earth magnets -- you'd need a honkin
powerful magnetic field at the "printer", and it'd need to be fast -- and
those two don't go together well.

I suspect that as a PM motor technology it probably made sense if the
best magnet material you had was AlNiCo (which is really easy to
demagnetize and remagnetize), but with rare earths (which aren't) you get
a huge efficiency advantage from the magnet's strength, and a huge
increase in difficulty of remagnetizing the thing, so the net result may
be that it's not worth it.

For a Really Honkin' Big motor it may make sense to have a bunch of poles
on the rotor, made with rare earth magnets, that can be mechanically
flipped, and a bunch of servoes to mechanically flip them under control
from some smart algorithm -- but that's not "printing".

--
Tim Wescott
Control system and signal processing consulting
www.wescottdesign.com

Tim Wescott fired this volley in
:


Also, it was suggested that since the poles could be re-written as the
motor ran, there could be theoretically non-integer numbers of poles
around the rotor, as they could be dynamically printed to match the
required speed.

Google cannot find any information on this...

Did I forget the actual name of this class of motor?

Sounds wacky; I've never heard of it.


I remember that. It came out as an article in Popular Science or Popular
Mechanics somewhere between the 60s and 90s, though I cannot put my
mental finger on when.

I don't think the concept ever made it to production, but the prototypes
seemed to work.

LLoyd

"Cross-Slide" wrote in message
...
I remember reading a book about motors, and one of the more
interesting ones was referred to as a "Printed Pole Motor" IIRC.

Did I forget the actual name of this class of motor?

I vaguely remember something about using them in a generator. Googling
"magnequench" didn't help, though it brought up a sad account of
leading Dems betraying the US by selling the technology to China.

On Sun, 23 Sep 2012 11:12:22 -0700, Cross-Slide wrote:

I remember reading a book about motors, and one of the more
interesting
ones was referred to as a "Printed Pole Motor" IIRC.

This motor had multiple salient poles on the rotor, and they could be
re-magnetized as they passed one location of the stator.
This allowed the pole count of the rotor to be dynamically changed by
re-printing some of the salient poles to create larger or smaller
groups
of North or South poles in succession around the rotor.

I think they were intended for very large motors for ball mills or
some
large mining operations, of low speed, and thus many poles around the
rotors.
Also, it was suggested that since the poles could be re-written as the
motor ran, there could be theoretically non-integer numbers of poles
around the rotor, as they could be dynamically printed to match the
required speed.

Google cannot find any information on this...

Did I forget the actual name of this class of motor?


I believe you may be thinking of a "Written Pole Motor"

They offer some advantages for motors in the 10 to 100 HP range when
single phase power must be used. I recall them as being relatively
expensive.

WayneJ

Cross-Slide wrote:

I remember reading a book about motors, and one of the more interesting
ones was referred to as a "Printed Pole Motor" IIRC.

I believe they are now used in high-end machining centers as a way
to get very wide speed ranges at full HP without using gearing or
belt drives. I think they are also called switched reluctance
motors. They do not use any permanent magnets, but rewrite the
poles on an iron rotor.

Jon

On Monday, September 24, 2012 5:45:57 PM UTC-5, Jon Elson wrote:
Cross-Slide wrote:



I remember reading a book about motors, and one of the more interesting

ones was referred to as a "Printed Pole Motor" IIRC.



I believe they are now used in high-end machining centers as a way

to get very wide speed ranges at full HP without using gearing or

belt drives. I think they are also called switched reluctance

motors. They do not use any permanent magnets, but rewrite the

poles on an iron rotor.



Jon

Thanks for the replies! Sorry it was not a political rant.
I was simply curious about something I read years ago...

IIRC switched reluctance motors use soft iron in the rotor poles, and rely on magnetic attraction to the poles.
Most motors have permanent or electromagnets to react against.
And the switched reluctance is yet again something different than a written pole motor.

Always something interesting to learn about...

On Mon, 24 Sep 2012 17:54:23 -0500, Jon Elson
wrote:

Cross-Slide wrote:

I remember reading a book about motors, and one of the more interesting
ones was referred to as a "Printed Pole Motor" IIRC.

I believe they are now used in high-end machining centers as a way
to get very wide speed ranges at full HP without using gearing or
belt drives. I think they are also called switched reluctance
motors. They do not use any permanent magnets, but rewrite the
poles on an iron rotor.

Jon
Apparently " printed" pole motors are now called "written" pole
motors. See this link: http://www.meridiumpower.ca/C/c_1.html for an
explanation.
Eric

On 2012-10-27, wrote:
On Mon, 24 Sep 2012 17:54:23 -0500, Jon Elson
wrote:

Cross-Slide wrote:

I remember reading a book about motors, and one of the more interesting
ones was referred to as a "Printed Pole Motor" IIRC.

I believe they are now used in high-end machining centers as a way
to get very wide speed ranges at full HP without using gearing or
belt drives. I think they are also called switched reluctance
motors. They do not use any permanent magnets, but rewrite the
poles on an iron rotor.

Jon
Apparently " printed" pole motors are now called "written" pole
motors. See this link: http://www.meridiumpower.ca/C/c_1.html for an
explanation.

Only called that by this maker. Note the (R) (registered
trademark symbol -- the letter 'R' in a circle) everywhere it is used,
and this note about ahla way down (where the (R) symbol is showing as
"\256" on my screen, showing that it is a non-printing character on this
system. But it may show up properly on yours.

================================================== ====================
Written-Pole® is a registered trademark of Precise Power Corporation.
================================================== ====================

And the printed motors which I have seen (and which I have a
few examples of) are DC motors, while these are AC for the standard power
line -- single phase or three phase.

Enjoy,
DoN.

--
Remove oil spill source from e-mail
Email: | Voice (all times): (703) 938-4564
(too) near Washington D.C. | http://www.d-and-d.com/dnichols/DoN.html
--- Black Holes are where God is dividing by zero ---

On 27 Oct 2012 01:45:54 GMT, "DoN. Nichols"
wrote:

On 2012-10-27, wrote:
On Mon, 24 Sep 2012 17:54:23 -0500, Jon Elson
wrote:

Cross-Slide wrote:

I remember reading a book about motors, and one of the more interesting
ones was referred to as a "Printed Pole Motor" IIRC.

I believe they are now used in high-end machining centers as a way
to get very wide speed ranges at full HP without using gearing or
belt drives. I think they are also called switched reluctance
motors. They do not use any permanent magnets, but rewrite the
poles on an iron rotor.

Jon
Apparently " printed" pole motors are now called "written" pole
motors. See this link: http://www.meridiumpower.ca/C/c_1.html for an
explanation.

Only called that by this maker. Note the (R) (registered
trademark symbol -- the letter 'R' in a circle) everywhere it is used,
and this note about ahla way down (where the (R) symbol is showing as
"\256" on my screen, showing that it is a non-printing character on this
system. But it may show up properly on yours.

================================================== ====================
Written-Pole® is a registered trademark of Precise Power Corporation.
================================================== ====================

And the printed motors which I have seen (and which I have a
few examples of) are DC motors, while these are AC for the standard power
line -- single phase or three phase.

Enjoy,
DoN.
I've hot a (big) handfull of printed circuit DC motors - some of
them complete with the servo tach mechanisms from old industrial
robots looking for an application. HEAVY little critters witk cast
steet? frames.

On Fri, 26 Oct 2012 21:56:25 -0400, wrote:

On 27 Oct 2012 01:45:54 GMT, "DoN. Nichols"
wrote:

On 2012-10-27, wrote:
On Mon, 24 Sep 2012 17:54:23 -0500, Jon Elson
wrote:

Cross-Slide wrote:

I remember reading a book about motors, and one of the more interesting
ones was referred to as a "Printed Pole Motor" IIRC.

I believe they are now used in high-end machining centers as a way
to get very wide speed ranges at full HP without using gearing or
belt drives. I think they are also called switched reluctance
motors. They do not use any permanent magnets, but rewrite the
poles on an iron rotor.

Jon
Apparently " printed" pole motors are now called "written" pole
motors. See this link: http://www.meridiumpower.ca/C/c_1.html for an
explanation.

Only called that by this maker. Note the (R) (registered
trademark symbol -- the letter 'R' in a circle) everywhere it is used,
and this note about ahla way down (where the (R) symbol is showing as
"\256" on my screen, showing that it is a non-printing character on this
system. But it may show up properly on yours.

================================================== ====================
Written-Pole® is a registered trademark of Precise Power Corporation.
================================================== ====================

And the printed motors which I have seen (and which I have a
few examples of) are DC motors, while these are AC for the standard power
line -- single phase or three phase.

Enjoy,
DoN.
I've hot a (big) handfull of printed circuit DC motors - some of
them complete with the servo tach mechanisms from old industrial
robots looking for an application. HEAVY little critters witk cast
steet? frames.
The motors I'm talking about are not printed circuit motors. The poles
are "printed" or "written" on the rotor as the motor spins. This way
the motor can have any number of poles on the rotor at any time. Each
time the rotor spins the magnetic poles can be changed by a winding in
the stator. Look at the link provided. And also note that as DoN
pointed out the term "written" is a registered trademark for this
particular type of AC motor.
Eric

On Sat, 27 Oct 2012 11:08:56 -0700, wrote:

On Fri, 26 Oct 2012 21:56:25 -0400, wrote:

On 27 Oct 2012 01:45:54 GMT, "DoN. Nichols"
wrote:

On 2012-10-27, wrote:
On Mon, 24 Sep 2012 17:54:23 -0500, Jon Elson
wrote:

Cross-Slide wrote:

I remember reading a book about motors, and one of the more interesting
ones was referred to as a "Printed Pole Motor" IIRC.

I believe they are now used in high-end machining centers as a way
to get very wide speed ranges at full HP without using gearing or
belt drives. I think they are also called switched reluctance
motors. They do not use any permanent magnets, but rewrite the
poles on an iron rotor.

Jon
Apparently " printed" pole motors are now called "written" pole
motors. See this link: http://www.meridiumpower.ca/C/c_1.html for an
explanation.

Only called that by this maker. Note the (R) (registered
trademark symbol -- the letter 'R' in a circle) everywhere it is used,
and this note about ahla way down (where the (R) symbol is showing as
"\256" on my screen, showing that it is a non-printing character on this
system. But it may show up properly on yours.

================================================== ====================
Written-Pole® is a registered trademark of Precise Power Corporation.
================================================== ====================

And the printed motors which I have seen (and which I have a
few examples of) are DC motors, while these are AC for the standard power
line -- single phase or three phase.

Enjoy,
DoN.
I've hot a (big) handfull of printed circuit DC motors - some of
them complete with the servo tach mechanisms from old industrial
robots looking for an application. HEAVY little critters witk cast
steet? frames.
The motors I'm talking about are not printed circuit motors. The poles
are "printed" or "written" on the rotor as the motor spins. This way
the motor can have any number of poles on the rotor at any time. Each
time the rotor spins the magnetic poles can be changed by a winding in
the stator. Look at the link provided. And also note that as DoN
pointed out the term "written" is a registered trademark for this
particular type of AC motor.
Eric
I am aware of the AC written pole motors. Basically computerized
re-wiring of the stator for different speeds .

On Sat, 27 Oct 2012 17:16:42 -0400, wrote:

On Sat, 27 Oct 2012 11:08:56 -0700, wrote:

On Fri, 26 Oct 2012 21:56:25 -0400, wrote:

On 27 Oct 2012 01:45:54 GMT, "DoN. Nichols"
wrote:

On 2012-10-27, wrote:
On Mon, 24 Sep 2012 17:54:23 -0500, Jon Elson
wrote:

Cross-Slide wrote:

I remember reading a book about motors, and one of the more interesting
ones was referred to as a "Printed Pole Motor" IIRC.

I believe they are now used in high-end machining centers as a way
to get very wide speed ranges at full HP without using gearing or
belt drives. I think they are also called switched reluctance
motors. They do not use any permanent magnets, but rewrite the
poles on an iron rotor.

Jon
Apparently " printed" pole motors are now called "written" pole
motors. See this link: http://www.meridiumpower.ca/C/c_1.html for an
explanation.

Only called that by this maker. Note the (R) (registered
trademark symbol -- the letter 'R' in a circle) everywhere it is used,
and this note about ahla way down (where the (R) symbol is showing as
"\256" on my screen, showing that it is a non-printing character on this
system. But it may show up properly on yours.

================================================== ====================
Written-Pole® is a registered trademark of Precise Power Corporation.
================================================== ====================

And the printed motors which I have seen (and which I have a
few examples of) are DC motors, while these are AC for the standard power
line -- single phase or three phase.

Enjoy,
DoN.
I've hot a (big) handfull of printed circuit DC motors - some of
them complete with the servo tach mechanisms from old industrial
robots looking for an application. HEAVY little critters witk cast
steet? frames.
The motors I'm talking about are not printed circuit motors. The poles
are "printed" or "written" on the rotor as the motor spins. This way
the motor can have any number of poles on the rotor at any time. Each
time the rotor spins the magnetic poles can be changed by a winding in
the stator. Look at the link provided. And also note that as DoN
pointed out the term "written" is a registered trademark for this
particular type of AC motor.
Eric
I am aware of the AC written pole motors. Basically computerized
re-wiring of the stator for different speeds .
If you go to the link provided or to the Precise Power web site you
will see that the AC written pole motors being discussed here are not
"Basically re-wiring of the stator". The rotor has an outside layer of
ferrite that is re-magnetized by a single winding in the stator. So it
is not the stator that is changing but instead is the rotor. And the
motor is analogous to a permanent magnet synchronous motor that has a
provision for changing the magnets in the rotor. But instead of
pulling the motor apart and and changing the number of magnets in the
rotor the and reassembling the motor the written pole motor just
magnetizes the rotor with the desired number of poles. Even 1/2 poles.
Go to the link and read about these motors.
Eric