Humm list not working? I also had problems with email getting kicked
back ast night.
I think this is also why Bendini also used a Hall Effect switch,
which has about 35kHz cutoff range, or about 30uS transients. That
should allow much much better accuracy at higher speeds. Various
suppliers carry it but Allegro has the vast majority. Their site
is http://www.allegromicro.com/selguide/hed1.htm specifically for
Hall sensors. They may even give out samples if you ask them to.
Now once you get one, hook it up to a something like a MOSFET which
only senses voltage and controls current - for your 10+ amps. The
speeds of MOSFETS are not that impressive however, so you may
think about using NPN Power for the hall switch.. which should
work also. POWER MOSFETS usually have 500nS or greater time
constants and Power NPN can have 50nS or less.
TO see some good MOSFETS - Digikey carries many of them - look at
International Rectifier
(http://www.irf.com/product-info/shortform/sfhexfet.html)
Outside of using a hall sensor a Photo Detector would be Ideal!
Radio Shack use to carry them, not sure anymore. You would have
to set up the optical system relative to the magnetic position,
and then build a circuit around that just like the Hall Switch.
I believe John stated somewhere that 'Ford' Motor company built
one of his devices and used Photo Sensors instead of Hall or
microswitches.
Well, again my 2 cents. GOOD LUCK! I applaud you for your efforts!
v/r Ken Carrigan
-----Original Message-----
From: Robert [mailto:billc9@prysm.net]
Sent: Monday, April 10, 2000 10:45 PM
To: Carrigan, Ken
Subject: Re: Adams motor: Bedini version
Hello Ken, You are absolutely correct. The micro switch "floats" at high
speed.
I have been looking for a high speed magnetic switch capable of handling 4
or 5 amps. The amps are high at start up, then fall into the ma range once
the motor is running. Do you know where I could find such a switch? I have
looked everywhere. Any help would be appreciated. My emails are bouncing on
the list for some reason, this is the reason for private email. The switch
just needs to be NO. Thks, Robert
----- Original Message -----
From: Carrigan, Ken <kcarrigan@anteon.com>
To: <interact@Keelynet.com>
Sent: Monday, April 10, 2000 9:15 PM
Subject: RE: Adams motor: Bedini version
> Robert, et all,
> There is a limit to the maximum repeatable switching time that a
> microswitch can switch at. It has to do with the spring constant
> if it is spring loaded, or reed switch with rebounding properties,
> or other physical properties.. which will regulate how fast it can
> switch and rebound. Given 2400rpm, or 40 rps and a 10 percent
> duty cycle of switching (maybe shorter?) will yield 2.5 milli sec
> switching speed at best. If a microswitch has 10mS rating on
> switch over to recovery time, then the duty cycle will suffer until
> it reaches 50%. That would be called 'floating' cause the switch
> will not open (or close) when it was suppose to. Weird things then
> could happen. Suggest a faster switch be used that has rating of
> 1uS time so that absolutes can be obtained.
>
> Just my thoughts...
>
> v/r Ken Carrigan
>
>
>
> -----Original Message-----
> From: Robert
> To: Hans von Lieven; interact@Keelynet.com
> Sent: 4/10/00 7:15 PM
> Subject: Re: Adams motor: Bedini version
>
> Hello Hans and all, I have not put a load on the rotor shaft yet. I have
> been so occupied with the voltage input to the battery, trying to nail
> that
> down with different tests. But today at work, I managed to make me a
> pulley
> to install on the output shaft. I have a small DC generator to connect
> to it
> by a small belt. Then I see what it will do. Regards, Robert
> ----- Original Message -----
> From: Hans von Lieven <hans@usenet.com.au>
> To: <interact@Keelynet.com>
> Sent: Monday, April 10, 2000 12:00 AM
> Subject: Adams motor: Bedini version
>
>
> > First of all congratulations Robert,
> >
> > It is good to hear of a success every now and then :-))
> >
> > I have a question though. Can you please tell us about the torque of
> the
> motor. Does it have any torque worth
> > speaking of and how does the motor react when there is a mechanical
> load
> placed on the rotor.
> >
> > It appears to me we are talking here about something other than an
> efficient conversion of electrical to
> > mechanical energy. Could it be that the rotating magnetic field sets
> up
> some sort of vortex that draws energy fom
> > elsewhere, similar to a venturi?
> >
> > If that is true, then the rotor might possibly be dispensed with and a
> solid state version could be designed. The
> > action of the motor is very reminiscent of Coler or Henderschott in my
> view. Even Keely in some way.
> >
> > Greetings from Down Under
> > Hans von Lieven
> >
> >
> > -------------------------------------------------------------
> > To leave this list, email <listserver@keelynet.com>
> > with the body text: leave Interact
> > list archives and on line subscription forms are at
> > http://keelynet.com/interact/
> > -------------------------------------------------------------
> >
>
>
> -------------------------------------------------------------
> To leave this list, email <listserver@keelynet.com>
> with the body text: leave Interact
> list archives and on line subscription forms are at
> http://keelynet.com/interact/
> -------------------------------------------------------------
>
> -------------------------------------------------------------
> To leave this list, email <listserver@keelynet.com>
> with the body text: leave Interact
> list archives and on line subscription forms are at
> http://keelynet.com/interact/
> -------------------------------------------------------------
>
-------------------------------------------------------------
To leave this list, email <listserver@keelynet.com>
with the body text: leave Interact
list archives and on line subscription forms are at
http://keelynet.com/interact/
-------------------------------------------------------------