i've had this hub hanging around for over a year and just recently discovered what i can do with it.
have a look !
some of you motorcycle people may recognize the hub.
It is a front wheel hub of a motorcycle Dual rotor Front disk brakes , and spins so true and smooth its unbelievable!
the axle is 3/4" threaded rod ( lightly filed to make it fit), because the origional axle shaft is 17mm just slightly less than 3/4".
one problem the tools i used to get this together
kidding ,,, all i used was two files to get to this point !!
a round one and a flat one. the round one i used to file the aluminum hub to make room for the rotor spokes. the flat one i used to file the 3/4" threaded rod down to 17mm so the hub bearngs would fit..
its so simple its unbelievable.
i knew if i turned the rotors around that i could get them closer together. that was a no brainer.
but until i looked at jerrys bearing and windmills , and thought some more , then it hit me , plus i had the 3/4" shaft allready mounted in the bicycle hub.i turned it around so the filed part went inside the bearing (hub).
and bolted the other end as you see it. i also installed some plastic as a stator mount, which is bolted between two 3/4-10 nuts.
The powers that be smiled on me that day.lol
Plus the pattern of the bolt holes can easily be transferred , thats what i've been using on my blade hub and also on the minigen 1 & 2 ,moreso on number two than # one.
the bolt pattern has 5/16" holes so all ya got to do is center it( on what you want to put the pattern on) on the rotor and drill six spotting holes, take it off and finish drilling .
as a bonus the pattern can be used to make the blade hub as i did on mini gen II
so thats it
you have a way to hook an awesome pair of rotors to a fixed point ,and have them run true as heck the stator holder has in fact moved when testing ,but thats no big deal just bolt it to whatever you are going to mount it on.
Testing coils:
my favorite part, yall are gonna love this..
i have a coil that i wound a long long time ago .its 1.5"dia by .75 " thick , not ideal , could be a tad more on the dia.
made with 0.045"dia wire close to 17 gauge. thats the coil in there now (in the photos) , it puts out 6V ac at 280 rpm as measured with the new meter. one coil !
now i know Flux is gonna love this ,but i had to try it , i then connected the coil to the ammeter and read 6A ac rms at 180 rpm , the voltage across the coil terminals during the amp test was 1.5V ac.
6 amps from one coil , i was amazed.
My plans for it:
The alternator :
is a 24 pole 18 coil beast with 48 7/8"dia by 1" neos , well not eighteen coils yet .
The rotors :
are 10.8"dia just large enough to fit all the mags correctly with the right amount of spacing.
The stator :
is gonna be awesome , some of ya may remember that i made a coil a long time ago , of 23 turns of #10 wire.
with the gap i have on there now of 0.95" i've figured that i can get at least 48 turns , ( 8 turns thick), by 1.75"dia , slightly less.
i may need some help deciding how many turns to use , in my recent notes using the 23 turn coil i got .71V at 60HZ , 300rpm.
BUT in my notes from before , (when i first wound the coil ) i was getting 1.5V at 227 rpm , the difference is the gap is larger now than it was... but if i fill the gap with wire (48 turns) will come to a .848" thick stator. this may be too many turns , i'm not sure...?
all i know is i think i'm making an arc welder here.because the phase resistance will be somewhere around 70 milli ohms.for six coils, 140 mOhms line to line resistance wired star or wye.
delta will be even less
below is a close up of the hub rotor and coil
close up rear
another front view
farther away rear view
