Thane Heins Perepiteia.

[aether22]

I just (a few hours ago) killed it, a magnet came flying off (found half of it) and it knocked off one of the steel pieces I JB-Welded to the transformer core.

I could put the half magnet back in, and add a bit of metal to keep the weight right and all would be Ok, but instead I just popped in a magnet that I had which was close enough, it doesn't seem to create more vibration when run so all up it's good.

I am waiting for the JB-Weld to cure on the stator though before I am able to run anymore tests (although I did run one test to see if it would accelerate with one steel piece missing, basically an open magnetic circuit and it did but speed changers were only noticeable with the tach, very very slow) , though I will now setup for the isolation test.

This also induced me to find another solution (one where wobble will not be an issue), so I found and ordered a 25cm cast iron pulley and will try and cook something up with that later, though I will need a different  diameter Arbour, luckily the new bench grinder I picked up yesterday has the right size, so I should end up with 2 complete setups.


addition: oh yeah, I forgot.

cut it as it turned into a full post length

[i_ron]

MAY I GO NOW?

Thane

When you gotta go you gotta go... yes, you have my permission,   

As Larry said... thanks for good humored sharing and help to all of us!

Ron

[aether22]

Before magnets and washers and steel was flying across the garage denting plasterboard I took some measurements at a higher RPM than before.
HCV was 8.5v and 7.3v
HCA was 1.5A and ??? (I only measured one of 'em)
HVV was 272v (series)
HVA was .07A

So remembering to cut the HV coil voltage in half the higher of the HV coils is 1/16th the voltage.
And .07A x 16 is 1.12A.

That is quite close to the 1.5A for the HC coil, the difference (and it's a kinda small diff, 23% less but a huge difference in it's effect on the rotor speed) may in part be explained by the fact that the 2 HC coils differed and that I only measured the current of one, and the HV coils were only measured in series.
The remainder of the difference can be accounted for by fact that the HC coils are first on the core and some of the flux will exit the core before it runs through all the HV turns.

So I consider both experimental results and conventional electrical equations to agree, the HC coils are unneeded provided you can either give it loads that suited to the higher voltage, or can put the hV output through a transformer while still pulling enough current so the HV coils work.

So Thane I would strongly recommend you take a closer look at your assumption, consider not just the amps but the volts also and see how different the amps x volts (watts) are in your generator for the 2 coils. (even if the HC coils generated say double the energy which is far from the case in my tests wouldn't you be better having 2 HV coils instead of 1 HV and 1 HC coil? And since it will turn faster you will get more energy than a single HC coil and with less energy into the motor)

At the very least you should look at your HV coils as a valuable source of electrical output and tap them.

And possibly run each through a transformer so both are at the same voltage and see if the HC coils are worth it.

Because based on my results if they have any increased energy output not accounted for by size or mass or position differences on the core it is not very large at all and not worth the deceleration at all.

Ron, since Thane may ignore me on this point I would ask that you take measurements as I have above, I know you have already done so but you need to include the HV amps.

Take all measurements with coils not under test open circuit.

Since I believe you have the HV coils closer to the magnets? (is that right?) you should have probably more ampere turns in your HV coils. (more energy)

[OUman]

Can you find one for sale online?

I think I posted some links before but Google can find them, for example:

http://www.sensotec.com/torque.asp
http://www.futek.com/product.aspx?t=torque
http://www.sensors.co.uk/products/pages/rwt.html
etc

[aether22]

I think I posted some links before but Google can find them, for example:

http://www.sensotec.com/torque.asp
http://www.futek.com/product.aspx?t=torque
http://www.sensors.co.uk/products/pages/rwt.html
etc

Problem is that from what I can see it would create a break in the shaft, which isn't what we want.

So I think that it would make far more sense to measure the force on the motor housing and i can not think of any way that can give a false positive. (except possibly for the motors torque improving because it is rotating at a speed where it is more powerful, easy to rule out)

So I think a reproduction of Vince's test is the best that can be done, I will try and do it later if an opportunity presents it's self.

Or if Vince recounts how he did it with enough detail.