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power for spinning led's (dc motor with power transmitter)

J

John Fields

Jan 1, 1970
0
Try a 2-ton satellite spinning at 4RPM hanging from a crane in a test
facility at Sperry Satellite Systems Division.

Made we so nervous I stood behind a steel roof support girder during
all the tests.

I designed the spin motor drive ;-)
 
A

Anthony Fremont

Jan 1, 1970
0
John Fields said:
Jim Thompson wrote:

I'm thinking that 4000 pounds and 75' wingspan are taking up the slack.
;-)
 
T

Tim Wescott

Jan 1, 1970
0
Quack said:
Hi Tim




That sounds sweet, so i suppose i lookup some generator examples (which
i have been doing already), and just try to model something around that
... Any tips or sites which offer some solid/tested examples or ill
just have to spend a few hours at the bench after ordering a bunch of
different kinds of magnets.

How about using electro-magnets on the outside (fixed) portion,
presumably this would provide a stronger magnetic field than any earth
magnet ?

Alex.
You'll burn up a lot of power in an electro magnet that generates as
much field as a rare earth magnet. Those things are almost magic
(almost -- they don't bend light yet).

You can get rare earths on the web at reasonable prices -- just google
for rare earth magnet and you'll have more choices than you know what to
do with.
 
J

Jim Thompson

Jan 1, 1970
0
You'll burn up a lot of power in an electro magnet that generates as
much field as a rare earth magnet. Those things are almost magic
(almost -- they don't bend light yet).

You can get rare earths on the web at reasonable prices -- just google
for rare earth magnet and you'll have more choices than you know what to
do with.

You already must have some method to spin this "creature". Why not
just add a small alternator with case tied to "creature" and shaft
pinned?

...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

Anyone can be rude, but it takes a Democrat to be a real dirtbag.
 
J

John Fields

Jan 1, 1970
0
Hi John,

I have been looking into sliprings, and have contacted over 15
manufacturers and can not find anything suitable, of the
vendors/manufacturers that replied, they all say that 1800rpm and 24/7
100% duty cycle is not reliable and not long lasting and also quite
expensive and requires constant maintenance as the brushes wear out.

So i am looking for a contactless solution.

---
What you need is a rotary transformer.

Check out the sketch on alt.binaries.schematics.electronic under the
same subject as this thread. If you'd like to have me build you one
email me, but it won't be cheap to do. :)
 
R

Rich Grise

Jan 1, 1970
0
Hi Everyone,

Anyone know of an easy way to get power to an array (100+) of spinning
LED's (and their Mcu's) in a display circuit ?

I was thinking of inducting the current through a setup of coils, but i
cant find any good examples of this, and it will need a couple amps@5v
dc.

Another suggestion was to run some AC through ball-bearings, but i
wonder how this would hold up after being run for 24 hours a day, 7
days a week at 1800 rpm ... Any examples of this being used ? It doesnt
sound too reliable to me.

Go to the local car recycler, get a car alternator, tear it apart,
and use its field coil slip rings.

Good Luck!
Rich
 
R

Rich Grise

Jan 1, 1970
0
Hi John,

I have been looking into sliprings, and have contacted over 15
manufacturers and can not find anything suitable, of the
vendors/manufacturers that replied, they all say that 1800rpm and 24/7
100% duty cycle is not reliable and not long lasting and also quite
expensive and requires constant maintenance as the brushes wear out.

So i am looking for a contactless solution.

As for data, i plan to use infra-red or rf.

Thanks though :) ill check out that link.

Alex.

How do they make car alternators run for 100,000 miles?

Thanks,
Rich
 
R

Rich Grise

Jan 1, 1970
0
I wonder what he's intending to accomplish.

Thanks,
Rich
 
Go to the local car recycler, get a car alternator, tear it apart,
and use its field coil slip rings.

Good Luck!
Rich

Yes, I'd consider using one whole if only a few need to be made. Using
those sliprings to transfer power, and the external alt shaft can be
belt driven.


NT
 
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