"Jasen Betts" bravely wrote to "MIKE ROSS" (04 Sep 03  18:02:41)
 --- on the heady topic of "Re: Vehicle LED's"

 JB> were I asked to design one I'd do something like this

 JB> ******************************         *****  hub
 JB> *                   H    H   *         *****
 JB> *   -------------.  H    H   *
 JB> *   -------------|  H |  H   *         #####  wheel axle
 JB> *   -------------| -H-| -H-# *         #####  and flange
 JB> *                |  H |  H # *
 JB> *   WWWWWWWWWWWW |  H |  H # *          H    gear
 JB> *   WWWWWWWWWWWW |  H |  H # *         -H-  gear axle
 JB> =   WWWWWWWWWWWW `--- `--- # =
 JB> ####################################      ||||   rotor
 JB> =   WWWWWWWWWWWW .--- .--- # =         ----
 JB> *   WWWWWWWWWWWW |  H |  H # *
 JB> *   WWWWWWWWWWWW |  H |  H # *         WWWW  stator attached to
 JB> *                |  H |  H # *               wheel axle
 JB> *   -------------| -H-| -H-# *
 JB> *   -------------|  H    H   *
 JB> *   -------------'  H    H   *
 JB> *                   H    H   *
 JB> ******************************

Hey, that's seriously nice ASCII art! My compliments to the keyboard
jockey.


 JB> the two sets of planetary gears should give a pretty serious
 JB> ratio getting about 6:1 on each one should be easy, as a result
 JB> a 36:1 gear ratio would be obtained

The gearing ratio reminds me of a clock mechanism. You must admit the
gear wear factor seems steep and it couldn't be done with nylon gears.
There's also a little matter of road impact shock to contend with.


 JB> and if you use more poles in the rotor/stator a further improvement
 JB> could be had.

So where would the magnet/winding be in the rotor or the stator? Either
spin a doughnut magnet or a lot of iron and wire, huh? I think I'd
rather spin a doughnut magnet in this case. OTOH a lot of poles would
mean a rectified DC output however it wouldn't need any filtering.

 Mike
 ****

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