Mini gen Test Data

[willib]

i've been working on a mini gen lately , and did some testing in front of a fan.

i got 2.29V dc @ 361 rpm with three  9 3/8  inch radius blades.

Then i hooked it up to a 1.2v NiMH battery.

it was putting 115 mA into the battery @ 263 rpm

thats 138mW

i expect it will do a lot better when i put the other ( 5 ) coils , on there.

as it is at the moment it is an 8 pole dual rotor machine (4.25"dia. ),with one of six coils .

mags are 7/8" dia x 1/2 ".

i'll post some pics later , i must say it looks pretty cool.

the coil isnt what i will be using later but i wanted to try it out.

it has 130 turns of #20 gauge, but i'm going for around 200 turns.

this is some data about the coils ,from my progam , i think i'll probably use.

  Gauge= 20  Wire dia. = 0.0340 inches  ohms per foot 0.0101500

coil od = 1.690 coil width = 0.462 coilid= 0.670

Final Diameter =                 1.690

Num turns per coil radius =      15.000

Number of turns per coil width = 13.588

total number of turns            203.824

wire length(feet)=               61.976

Single wound ohms per coil     0.629054 turns/coil= 203.82

Total ohms for one phase                     (2 coils)       1.258

Delta single wound line to line resistance (2 coils/phase) 0.8387

[willib]

below is the heart of the minigen , a 5 1/4 HD mtor bearing.

i've turned it around so  the platten holder faces outward.

you can see why later.

this  is how it was before i installed a cut  bicycle sprocket,and before i put the 7/8" dia magnets on there.those are 1/2" dia magnets .













this took around two hours to cut by hand

 This is the first time i broke them yestrerday, i didnt take a pic of the second time.





a little epoxy and good as new.

The blade hub came out cool . i cut the foam with a hot wire, and used two plattens from the HD to make a foam sandwich.









This is the finished closeup

Yesterday reminded me of a monty python movie where this guy built a castle on a swamp,that sank into the swamp  ,so he built another , that also sank into the swamp, the third one burnt to the ground , then sunk into the swamp , BUT the FOURTH ONE....you get the idea..

[willib]

the lake that it feeds into is much higher than it was earlier , the drop is now only about three to three and a half feet...

it was at least five or six feet before.

i calculated the flow at 708 cfm, its ten feet across and six inches deep over the dam