Re: gEDA-user: Magnetic bike operation

[Rob Butts <r.butts2@xxxxxxxxx>]

   I've read about the eddy current breaks but it's still not clear to me
   how to construct one.  The wikipedia talks about a rotor connected to a
   spinnning coil.  I would think the rotor would spin inside a coil.
   Then wikipedia talks about using electromagnets and varying the
   breaking force by varying the magnetic field.

   On Sun, Mar 28, 2010 at 8:03 PM, David C. Kerber
   <[1]dkerber@xxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:

     My bicycle trainer uses an eddy current brake; there are no wires
     anywhere in the load; just a ventilated disk and a magnet that I can
     move closer or further away from the disk by turning an adjustment
     dial.
     D

   > -----Original Message-----
   > From: [2]geda-user-bounces@xxxxxxxxxxxxxx
   > [mailto:[3]geda-user-bounces@xxxxxxxxxxxxxx] On Behalf Of Rob Butts
   > Sent: Saturday, March 27, 2010 4:29 PM
   > To: gEDA user mailing list

   > Subject: gEDA-user: Magnetic bike operation
   >
   > I'm having a debate with an ee friend about how the magnetic
   > resistance works on an excersice bike.
   >
   > It occurred to me this would be the best place to solve it.
   >
   > Does anyone know if it is simply an electro-magnet close to a
   > metal wheel where the stronger the magnetic field the
   > stronger the resistance?  Or is it alternating magnets in a
   > flywheel type configuration with a toriodal coil surrounding
   > the flywheel and a variable resistance in the coil circuit
   > resists the induced current providing the resistance to user
   > who would be spinning the flywheel?  (Sorry if I didn't
   > describe that well).
   >
   > Or is it something completely different?
   >
   > Thanks
   >

   _______________________________________________
   geda-user mailing list
   [4]geda-user@xxxxxxxxxxxxxx
   [5]http://www.seul.org/cgi-bin/mailman/listinfo/geda-user

References

   1. mailto:dkerber@xxxxxxxxxxxxxxxxxxxxxxxxxx
   2. mailto:geda-user-bounces@xxxxxxxxxxxxxx
   3. mailto:geda-user-bounces@xxxxxxxxxxxxxx
   4. mailto:geda-user@xxxxxxxxxxxxxx
   5. http://www.seul.org/cgi-bin/mailman/listinfo/geda-user


_______________________________________________
geda-user mailing list
geda-user@xxxxxxxxxxxxxx
http://www.seul.org/cgi-bin/mailman/listinfo/geda-user