switched reluctance motors

Hi,

Anyone know where I can find small (100 W or so) switched reluctance motors for sale? (Yes, I used Google, and the best I could come up with was these guys, who 1. make motors too large for me at the moment, and 2. seem awfully reluctant to give specs or pricing). http://www.nidec.com/en-NA/product/motor/keyword/?q=sr+motor&btnKeyword=mgdb

Alternatively, does anyone know of any products which use them (so I can hunt for used ones to scavenge)?

Thanks,

Michael

 

[Cydrome Leader]

mrdarrett@gmail.com wrote: > Hi, > > Anyone know where I can find small
(100 W or so) switched reluctance motors for sale? (Yes, I used Google,
and the best I could come up with was these guys, who 1. make motors too
large for me at the moment, and 2. seem awfully reluctant to give specs
or pricing).
http://www.nidec.com/en-NA/product/motor/keyword/?q=sr+motor&btnKeyword=mgdb

Alternatively, does anyone know of any products which use them (so I
can hunt for used ones to scavenge)? > > Thanks, > > Michael

Mine was a spare from some type of medical imaging device. I forgot what
company made it, never found full specs. They're easy to identify at
surplus stores as they have virtually no cogging when you spin the rotor
and have more leads than an synchronous motor.

Eastern Air Devices still makes them, try ebay for used ones.

http://www.electrocraft.com/files/ead_step.pdf

 

On Thursday, May 5, 2016 at 9:29:10 AM UTC-7, Cydrome Leader wrote:

mrdarrett@gmail.com wrote: > Hi, > > Anyone know where I can find small
(100 W or so) switched reluctance motors for sale? (Yes, I used Google,
and the best I could come up with was these guys, who 1. make motors too
large for me at the moment, and 2. seem awfully reluctant to give specs
or pricing).
http://www.nidec.com/en-NA/product/motor/keyword/?q=sr+motor&btnKeyword=mgdb
Alternatively, does anyone know of any products which use them (so I
can hunt for used ones to scavenge)? > > Thanks, > > Michael

Mine was a spare from some type of medical imaging device. I forgot what
company made it, never found full specs. They're easy to identify at
surplus stores as they have virtually no cogging when you spin the rotor
and have more leads than an synchronous motor.

Eastern Air Devices still makes them, try ebay for used ones.

http://www.electrocraft.com/files/ead_step.pdf

Thanks!

I did some more digging since I posted and it looks like the Maytag Neptune experimented with switched reluctance motors too.

http://www.practicalmachinist.com/vb/transformers-phase-converters-and-vfd/maytag-neptune-182503/

Michael

 

On Thursday, May 5, 2016 at 9:34:25 AM UTC-7, mrda...@gmail.com wrote:

On Thursday, May 5, 2016 at 9:29:10 AM UTC-7, Cydrome Leader wrote:
mrdarrett@gmail.com wrote: > Hi, > > Anyone know where I can find small
(100 W or so) switched reluctance motors for sale? (Yes, I used Google,
and the best I could come up with was these guys, who 1. make motors too
large for me at the moment, and 2. seem awfully reluctant to give specs
or pricing).
http://www.nidec.com/en-NA/product/motor/keyword/?q=sr+motor&btnKeyword=mgdb
Alternatively, does anyone know of any products which use them (so I
can hunt for used ones to scavenge)? > > Thanks, > > Michael

Mine was a spare from some type of medical imaging device. I forgot what
company made it, never found full specs. They're easy to identify at
surplus stores as they have virtually no cogging when you spin the rotor
and have more leads than an synchronous motor.

Eastern Air Devices still makes them, try ebay for used ones.

http://www.electrocraft.com/files/ead_step.pdf


Thanks!

I did some more digging since I posted and it looks like the Maytag Neptune experimented with switched reluctance motors too.

http://www.practicalmachinist.com/vb/transformers-phase-converters-and-vfd/maytag-neptune-182503/

Michael

Hey wait a minute. Are hard drive motors switched-reluctance ones, or basically brushless DC (with permanent magnets)?

Michael

 

On Thursday, May 5, 2016 at 12:25:26 PM UTC-7, Baron wrote:

mrdarrett@gmail.com prodded the keyboard with:

On Thursday, May 5, 2016 at 9:34:25 AM UTC-7, mrda...@gmail.com
wrote:
On Thursday, May 5, 2016 at 9:29:10 AM UTC-7, Cydrome Leader wrote:
mrdarrett@gmail.com wrote: > Hi, > > Anyone know where I can find
small
(100 W or so) switched reluctance motors for sale? (Yes, I used
Google, and the best I could come up with was these guys, who 1.
make motors too
large for me at the moment, and 2. seem awfully reluctant to
give specs or pricing).

http://www.nidec.com/en-NA/product/motor/keyword/?q=sr+motor&btnKeyword=mgdb
Alternatively, does anyone know of any products which use
them (so I
can hunt for used ones to scavenge)? > > Thanks, > > Michael

Mine was a spare from some type of medical imaging device. I
forgot what company made it, never found full specs. They're easy
to identify at surplus stores as they have virtually no cogging
when you spin the rotor
and have more leads than an synchronous motor.

Eastern Air Devices still makes them, try ebay for used ones.

http://www.electrocraft.com/files/ead_step.pdf


Thanks!

I did some more digging since I posted and it looks like the Maytag
Neptune experimented with switched reluctance motors too.


http://www.practicalmachinist.com/vb/transformers-phase-converters-and-vfd/maytag-neptune-182503/

Michael


Hey wait a minute. Are hard drive motors switched-reluctance ones,
or basically brushless DC (with permanent magnets)?

Michael

Brushless DC with permanent magnets.

--
Best Regards:
Baron.

Oh ok. Thanks.

Michael

 

On Thursday, May 5, 2016 at 3:05:57 PM UTC-7, Tim Wescott wrote:

On Wed, 04 May 2016 19:36:05 -0700, mrdarrett wrote:

Hi,

Anyone know where I can find small (100 W or so) switched reluctance
motors for sale? (Yes, I used Google, and the best I could come up with
was these guys, who 1. make motors too large for me at the moment, and
2. seem awfully reluctant to give specs or pricing).
http://www.nidec.com/en-NA/product/motor/keyword/?q=sr
+motor&btnKeyword=mgdb

Alternatively, does anyone know of any products which use them (so I can
hunt for used ones to scavenge)?

Thanks,

Michael

Out of curiosity, what are you planning on doing?

I can't help you with finding any, alas.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

I was hoping to see how to drive one by exciting the various windings by using a microcontroller to provide pulses to transistors in sequence.

I was also hoping to take it apart to see how it is constructed: must everything be laminated, or would solid iron work, or what.

Long-term, perhaps make an r/c airplane out of a small one, or a fan.

It's really quite an interesting motor design. I like how it doesn't need rare earth magnets (imported from China, right?)

Thanks,

Michael

 

[Baron]

mrdarrett@gmail.com prodded the keyboard with:

On Thursday, May 5, 2016 at 9:34:25 AM UTC-7, mrda...@gmail.com
wrote:
On Thursday, May 5, 2016 at 9:29:10 AM UTC-7, Cydrome Leader wrote:
mrdarrett@gmail.com wrote: > Hi, > > Anyone know where I can find
small
(100 W or so) switched reluctance motors for sale? (Yes, I used
Google, and the best I could come up with was these guys, who 1.
make motors too
large for me at the moment, and 2. seem awfully reluctant to
give specs or pricing).

http://www.nidec.com/en-NA/product/motor/keyword/?q=sr+motor&btnKeyword=mgdb
Alternatively, does anyone know of any products which use
them (so I
can hunt for used ones to scavenge)? > > Thanks, > > Michael

Mine was a spare from some type of medical imaging device. I
forgot what company made it, never found full specs. They're easy
to identify at surplus stores as they have virtually no cogging
when you spin the rotor
and have more leads than an synchronous motor.

Eastern Air Devices still makes them, try ebay for used ones.

http://www.electrocraft.com/files/ead_step.pdf


Thanks!

I did some more digging since I posted and it looks like the Maytag
Neptune experimented with switched reluctance motors too.


http://www.practicalmachinist.com/vb/transformers-phase-converters-and-vfd/maytag-neptune-182503/

Michael


Hey wait a minute. Are hard drive motors switched-reluctance ones,
or basically brushless DC (with permanent magnets)?

Michael

Brushless DC with permanent magnets.

--
Best Regards:
Baron.

 

[Tim Wescott]

On Wed, 04 May 2016 19:36:05 -0700, mrdarrett wrote:

Hi,

Anyone know where I can find small (100 W or so) switched reluctance
motors for sale? (Yes, I used Google, and the best I could come up with
was these guys, who 1. make motors too large for me at the moment, and
2. seem awfully reluctant to give specs or pricing).
http://www.nidec.com/en-NA/product/motor/keyword/?q=sr
+motor&btnKeyword=mgdb

Alternatively, does anyone know of any products which use them (so I can
hunt for used ones to scavenge)?

Thanks,

Michael

Out of curiosity, what are you planning on doing?

I can't help you with finding any, alas.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

 

[Tim Wescott]

On Thu, 05 May 2016 15:14:25 -0700, mrdarrett wrote:

On Thursday, May 5, 2016 at 3:05:57 PM UTC-7, Tim Wescott wrote:
On Wed, 04 May 2016 19:36:05 -0700, mrdarrett wrote:

Hi,

Anyone know where I can find small (100 W or so) switched reluctance
motors for sale? (Yes, I used Google, and the best I could come up
with was these guys, who 1. make motors too large for me at the
moment, and 2. seem awfully reluctant to give specs or pricing).
http://www.nidec.com/en-NA/product/motor/keyword/?q=sr
+motor&btnKeyword=mgdb

Alternatively, does anyone know of any products which use them (so I
can hunt for used ones to scavenge)?

Thanks,

Michael

Out of curiosity, what are you planning on doing?

I can't help you with finding any, alas.

--

Tim Wescott Wescott Design Services http://www.wescottdesign.com


I was hoping to see how to drive one by exciting the various windings by
using a microcontroller to provide pulses to transistors in sequence.

I was also hoping to take it apart to see how it is constructed: must
everything be laminated, or would solid iron work, or what.

Long-term, perhaps make an r/c airplane out of a small one, or a fan.

It's really quite an interesting motor design. I like how it doesn't
need rare earth magnets (imported from China, right?)

I'm pretty sure that if you looked the weight needed to generate a given
amount of power at reasonable efficiency, a motor with rare-earth magnets
would win hands-down.

IIRC, there are rare earth mines in the US that haven't operated since
forever -- so there's a supply in the continental US if we ever go to war
with China, and if either country is still standing after the first day.

There's supposed to be nodules of fairly high-grade rare-earth ore lying
at the bottom of the Pacific ocean in international waters, just waiting
for someone to dive down and pick them up. Unfortunately, the cost of
"just" diving down and picking them up is far more than the cost of stuff
from China.

But -- keep us posted.

--
Tim Wescott
Control systems, embedded software and circuit design
I'm looking for work! See my website if you're interested
http://www.wescottdesign.com

 

On Thursday, May 5, 2016 at 11:03:49 PM UTC-7, Tim Wescott wrote:

On Thu, 05 May 2016 15:14:25 -0700, mrdarrett wrote:

On Thursday, May 5, 2016 at 3:05:57 PM UTC-7, Tim Wescott wrote:
On Wed, 04 May 2016 19:36:05 -0700, mrdarrett wrote:

Hi,

Anyone know where I can find small (100 W or so) switched reluctance
motors for sale? (Yes, I used Google, and the best I could come up
with was these guys, who 1. make motors too large for me at the
moment, and 2. seem awfully reluctant to give specs or pricing).
http://www.nidec.com/en-NA/product/motor/keyword/?q=sr
+motor&btnKeyword=mgdb

Alternatively, does anyone know of any products which use them (so I
can hunt for used ones to scavenge)?

Thanks,

Michael

Out of curiosity, what are you planning on doing?

I can't help you with finding any, alas.

--

Tim Wescott Wescott Design Services http://www.wescottdesign.com


I was hoping to see how to drive one by exciting the various windings by
using a microcontroller to provide pulses to transistors in sequence.

I was also hoping to take it apart to see how it is constructed: must
everything be laminated, or would solid iron work, or what.

Long-term, perhaps make an r/c airplane out of a small one, or a fan.

It's really quite an interesting motor design. I like how it doesn't
need rare earth magnets (imported from China, right?)

I'm pretty sure that if you looked the weight needed to generate a given
amount of power at reasonable efficiency, a motor with rare-earth magnets
would win hands-down.

IIRC, there are rare earth mines in the US that haven't operated since
forever -- so there's a supply in the continental US if we ever go to war
with China, and if either country is still standing after the first day.

There's supposed to be nodules of fairly high-grade rare-earth ore lying
at the bottom of the Pacific ocean in international waters, just waiting
for someone to dive down and pick them up. Unfortunately, the cost of
"just" diving down and picking them up is far more than the cost of stuff
from China.

But -- keep us posted.

--
Tim Wescott
Control systems, embedded software and circuit design
I'm looking for work! See my website if you're interested
http://www.wescottdesign.com

Yep, I really want one to study it thoroughly, really. I hadn't realized these motors are so rare. It's even more surprising considering they were first developed in the '30s... the 1830s.

Yeah, they're supposed to be a little on the heavy side.

Are you referring to Molycorp's mine in California?
https://www.hcn.org/articles/the-u-s-s-only-rare-earth-mine-files-bankruptcy

Oh well. This could save the ore for when it's really needed, someday in the future.

Thanks,

Michael

 

[Cydrome Leader]

mrdarrett@gmail.com wrote:

On Thursday, May 5, 2016 at 3:05:57 PM UTC-7, Tim Wescott wrote:
On Wed, 04 May 2016 19:36:05 -0700, mrdarrett wrote:

Hi,

Anyone know where I can find small (100 W or so) switched reluctance
motors for sale? (Yes, I used Google, and the best I could come up with
was these guys, who 1. make motors too large for me at the moment, and
2. seem awfully reluctant to give specs or pricing).
http://www.nidec.com/en-NA/product/motor/keyword/?q=sr
+motor&btnKeyword=mgdb

Alternatively, does anyone know of any products which use them (so I can
hunt for used ones to scavenge)?

Thanks,

Michael

Out of curiosity, what are you planning on doing?

I can't help you with finding any, alas.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com


I was hoping to see how to drive one by exciting the various windings by using a microcontroller to provide pulses to transistors in sequence.

I was also hoping to take it apart to see how it is constructed: must everything be laminated, or would solid iron work, or what.

There won't be anything interesting in there. Stator will be like that of
stepper motor, and the rotor will just have some poles, probably a number
that doesn't match that of the stator.

> Long-term, perhaps make an r/c airplane out of a small one, or a fan.

It will be too weak and heavy for sure for a plane. They're made to be
cheap, not strong, and I suspect the no-cogging effect when freewheeling
is another factor they even produce them at all. The drag is virtually
nothing when turning the shafts on them.

> It's really quite an interesting motor design. I like how it doesn't
need rare earth magnets (imported from China, right?) > > Thanks, > >
Michael

 

[Tim Wescott]

On Fri, 06 May 2016 09:02:49 -0700, mrdarrett wrote:

On Thursday, May 5, 2016 at 11:03:49 PM UTC-7, Tim Wescott wrote:
On Thu, 05 May 2016 15:14:25 -0700, mrdarrett wrote:

On Thursday, May 5, 2016 at 3:05:57 PM UTC-7, Tim Wescott wrote:
On Wed, 04 May 2016 19:36:05 -0700, mrdarrett wrote:

Hi,

Anyone know where I can find small (100 W or so) switched
reluctance motors for sale? (Yes, I used Google, and the best I
could come up with was these guys, who 1. make motors too large
for me at the moment, and 2. seem awfully reluctant to give specs
or pricing).
http://www.nidec.com/en-NA/product/motor/keyword/?q=sr
+motor&btnKeyword=mgdb

Alternatively, does anyone know of any products which use them (so
I can hunt for used ones to scavenge)?

Thanks,

Michael

Out of curiosity, what are you planning on doing?

I can't help you with finding any, alas.

--

Tim Wescott Wescott Design Services http://www.wescottdesign.com


I was hoping to see how to drive one by exciting the various windings
by using a microcontroller to provide pulses to transistors in
sequence.

I was also hoping to take it apart to see how it is constructed: must
everything be laminated, or would solid iron work, or what.

Long-term, perhaps make an r/c airplane out of a small one, or a fan.

It's really quite an interesting motor design. I like how it doesn't
need rare earth magnets (imported from China, right?)

I'm pretty sure that if you looked the weight needed to generate a
given amount of power at reasonable efficiency, a motor with rare-earth
magnets would win hands-down.

IIRC, there are rare earth mines in the US that haven't operated since
forever -- so there's a supply in the continental US if we ever go to
war with China, and if either country is still standing after the first
day.

There's supposed to be nodules of fairly high-grade rare-earth ore
lying at the bottom of the Pacific ocean in international waters, just
waiting for someone to dive down and pick them up. Unfortunately, the
cost of "just" diving down and picking them up is far more than the
cost of stuff from China.

But -- keep us posted.

--
Tim Wescott Control systems, embedded software and circuit design I'm
looking for work! See my website if you're interested
http://www.wescottdesign.com


Yep, I really want one to study it thoroughly, really. I hadn't
realized these motors are so rare. It's even more surprising
considering they were first developed in the '30s... the 1830s.

Yeah, they're supposed to be a little on the heavy side.

Are you referring to Molycorp's mine in California?
https://www.hcn.org/articles/the-u-s-s-only-rare-earth-mine-files-
bankruptcy

Oh well. This could save the ore for when it's really needed, someday
in the future.

That's the one I know about. Wikipedia says the stuff's all over. I
think the issue is that you have to tear up a whole bunch of ground to
get enough ore -- in the US we respect environmentalists, in China they
shoot them, or make them work in the mines. So China has mines.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com