GENERATOR- YOU DO THE IN/OUT POWER MATH

[mscoffman]

Hi Bruce,

I used this full-wave rectifier, the black square one with four legs in the picture :

http://maplin.co.uk/Module.aspx?ModuleNo=19088

My pickup coil is 0.28mm magnet wire, not stranded.

No bearings in the old setup we are discussin, axle mounted through holes in PV drainpipe so there is friction unfortunately.

But i now have these bearings :

http://www.amazon.co.uk/gp/product/B002SRSUUU/ref=oss_product

They are actually open bearings unlike the picture, so i can lubricate them easily.

They are meant to be outside diameter 19mm, but i made a hole with my 19mm router bit and there is about 0.25mm of space

So i have mounted them in 19mm plastic waste pipe.

Bearings mounted on 6mm carbon-rod shaft.

The work isn't master craftmanship since i know as much about DIY as i do about electronics !

I will also order this PWM kit when it is back in stock, which can run on 9V batteries :

http://cpc.farnell.com/1/1/47000-dc-pulse-width-k8004-velleman-kit.html

So stranded wire is more effective for induction ?

What gauge should the strands be etc ... ?

Here is a picture of the setup so far :

http://qvision.pwp.blueyonder.co.uk/GEM4.JPG

Thanks,

Gary

@Deepcut

#1
The diode bridge should be good to about 200Khz. But the main problem with pure
silicon diodes is the 0.6 Voltage pedastel or 1.2Volts for a diode bridge. In effect
that voltage is lost. It is not ineffciency because no current flows then. To
get around that build your bridge from Schottky or germainium diodes.

#2
Stranded wire is done for mechanical flexibility only and does not have any
electrical effects. Often they talk about Litz wire where strands are insulated from
each other so they are in parallel and this does have an effect. RF currents travel
in the surface of wires so Litz wire gives more surfaces for RF to travel in.

:S:MarkSCoffman

[DeepCut]

...

If you could measure the voltage with DVM and current with the mechanical
meter simultaneously through a fixed 10Kohm load resister cc: brown black orange
and then again through a 4.7Kohm resister cc: yellow violet red. It might be helpful.
10K seems much too high to be the effective impedance of the output coils.
The calculated P should go *up* with the 4.7K ohms resister in my opinion.
Note if the rotor RPM changes with more load.

...

:S:MarkSCoffman

Thanks Mark.

I have the magnet assembly mounted, finally.

Since it is now on bearings i am going to do all tests again, beginning with simultaneous voltage/current measurement as you specified.

But first i have to wind a new coil (and eat some food !) so i should have the results of that first test by 9pm UK time (2 hours after this post).

Picture of magnet assembly is here :

http://qvision.pwp.blueyonder.co.uk/GEM4_2.JPG


Gary.

[DeepCut]

Had to scrap that one.

My crappy assembly was slowing bearings down because of the frame design ... ::SIGH::

No-one told me i'd have to learn woodwork, metalwork and mechanical engineering as well as electronics !!!  ;+}

Am mounting old coil on new, simple frame.

Will post soon as.


Gary.

[DeepCut]

Un-bloody-believable !

The bearings are FOUR TIMES SLOWER than having it rotate against the insides of a PVC pipe-section ...

That just amazes me.

I've googled a bit and the max RPM i could find of a ball-race bearing was 10,000.

Should have done my research first ... assume makes an ASS out of U and ME ;+}

I am now going to shut my mouth and try and get as close as possible to Tom's setup.

I'm having trouble finding the wire-spool he uses for pickup here in the UK, he called it 'cross-connect' wire.

Any UK people know what the equivalent is over here ?


Thanks,

Gary.

[DeepCut]

I'm load-testing voltage only at the moment because i want to be sure i get it right.

In this picture the battery represents the coil output (but my coil output is rectified).

Are the connections in the right place ?

Because when i turn the pot up (clockwise) the voltage goes down but the magnet is unaffected.


Gary.