Author Topic: Active Pitchcontrol  (Read 251006 times)

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hiker

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Re: Active Pitchcontrol
« Reply #780 on: July 16, 2017, 10:44:11 AM »
Looks great...with bigger coils..its possible to weaken your mags with to large of a load..or shorting out gen ...coils put out a reverse field under load and will weaken the mags if not sized for the coils.. My Pedgen has thin neo mags glued on top of ceramic mags..I've noticed overtime and abuse they have lost a bit of strength...ceramics are still the same...
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mbouwer

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Re: Active Pitchcontrol
« Reply #781 on: July 17, 2017, 04:38:25 AM »
The laminations bolted back on the supporting ring. Should I apply stainless bolts here?

hiker

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Re: Active Pitchcontrol
« Reply #782 on: July 17, 2017, 06:04:02 PM »
Looks like you used hot glue as well ? Stainless may be better..iron might cause a bit of cogging..but if their buried in the lams..Should work fine..what about the coils ? Glued down. ? Make sure the coil legs are good and covered...
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mbouwer

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Re: Active Pitchcontrol
« Reply #783 on: July 18, 2017, 05:16:30 AM »
It is the choise: a normal steel bolt that turns magnetic itself

                        stainless steel that means less "good" iron in the core.
« Last Edit: July 18, 2017, 11:45:19 AM by mbouwer »

hiker

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Re: Active Pitchcontrol
« Reply #784 on: July 18, 2017, 12:28:07 PM »
Not sure on eddy currants...stainless if open to the elements..plastic liner around the bolt as well..keep it from shorting out the lams..?
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mbouwer

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Re: Active Pitchcontrol
« Reply #785 on: July 18, 2017, 01:53:10 PM »
Original the package had thin weldings on a number of points.
« Last Edit: July 18, 2017, 02:25:03 PM by mbouwer »

joestue

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Re: Active Pitchcontrol
« Reply #786 on: July 18, 2017, 10:31:58 PM »
I'm not sure, but i still think the original lamination will be better, if you fill them completely full of copper.

The weld on the back side won't matter, because the flux density behind the teeth is a third or less of that in the tooth, where it matters the most.

as far as the bolts go, stainless or brass will probably be better than steel because the flux density in that area might be rather high, but i'm thinking it may not make a significant difference, simply because the frequency won't be that high.

in my 30 pole, 36 slot machine made from a 1/6th hp 6 pole induction motor, the iron losses at 1750 rpm or 400hz were about 100 watts

mbouwer

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Re: Active Pitchcontrol
« Reply #787 on: July 19, 2017, 05:29:38 AM »
The bolts can always be replaced by stainless steel bolts or also by a smaller size with plastic lining.

Modified suspension bracket of Reply #724
I will drill the holes after the axle is positioned exactly in the center of the lamination core.

MattM

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Re: Active Pitchcontrol
« Reply #788 on: July 19, 2017, 05:07:34 PM »
I would avoid ionic transition between dissimilar metals before I'd worry about flux.  What good is weakening it's longevity for an insignificant gain?

mbouwer

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Re: Active Pitchcontrol
« Reply #789 on: July 20, 2017, 04:11:22 AM »
So in a subsequent test setup no bolts through the lamination core?

hiker

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Re: Active Pitchcontrol
« Reply #790 on: July 20, 2017, 12:57:54 PM »
with the bolts mounted to the lam rim...ide go with Iron bolts ..might have a slight decress in drag..with out bolts...and also a slight  loss in power output..with stainless bolts you would still have the drag..and a slight loss in power..choise is yours...
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mbouwer

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Re: Active Pitchcontrol
« Reply #791 on: July 21, 2017, 05:21:10 AM »
Back on the test stand. Moving the 3 magnets 20 x 10 x 2 above the coil shows 4 volt.

Now I want to make a rotor.
« Last Edit: July 21, 2017, 05:30:37 PM by mbouwer »

hiker

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Re: Active Pitchcontrol
« Reply #792 on: July 21, 2017, 08:30:53 PM »
What kind of voltage are you shooting for ? no dout it will be shocking !😜
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mbouwer

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Re: Active Pitchcontrol
« Reply #793 on: July 22, 2017, 04:54:28 AM »
A coil with 0,5 mm wire gives 0,4 volt. So what is wise?

While I try to build a small mill it's the exchange of ideas, and if possible also of parts, I like most.

The material to put together the rotor.


 

hiker

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Re: Active Pitchcontrol
« Reply #794 on: July 22, 2017, 04:48:49 PM »
The rotor can be solid...or your just using what's available?  Can't wait to see the finale build...the fun part is always the build..
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mbouwer

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Re: Active Pitchcontrol
« Reply #795 on: July 23, 2017, 04:33:05 AM »
If laminated has no advantages next time I will make it solid.
« Last Edit: July 23, 2017, 04:44:17 AM by mbouwer »

mbouwer

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Re: Active Pitchcontrol
« Reply #796 on: July 23, 2017, 12:35:40 PM »
Regularly, also like today, I mow with my electric powered ride-on mower.
It would be nice to do that with energy generated by my own mill.

hiker

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Re: Active Pitchcontrol
« Reply #797 on: July 23, 2017, 03:20:22 PM »
Coils need the lams to help control the eddy currants...other wise you get a lot of extra drag..less output..looks great
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joestue

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Re: Active Pitchcontrol
« Reply #798 on: July 23, 2017, 04:10:54 PM »
the rotor only deals with eddy currents according to the change in flux in the magnet, which is usually rather small.


hiker

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Re: Active Pitchcontrol
« Reply #799 on: July 23, 2017, 09:39:53 PM »
Solid rotor..lams for coils....guess I should have clarified..😜
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joestue

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Re: Active Pitchcontrol
« Reply #800 on: July 24, 2017, 01:16:37 AM »
Well, whatever. Highspeed machines would benefit from laminated magnets.

Anyhow as I said before you need all of the magnets and one test coil, and then take 95% of that to get open circuit volts.

Alternatively you could setup.. a single magnet, or three of them. Fix the rotor to a pendulum and let it swing back and forth ( for 40 magnets) 18? degrees of travel. I suppose the volts you get out might be accurate... idk. Anyhow it will be rather low frequency so you'll have to rectify the output, charge up a capacitor and measure the dc volts with a high impedance volt meter.of course this assumes zero lost volts in the diodes

Anyhow I can't see how you can measure the volts from a single coil and a few magnets without an oscope and a spectrum analyzer.. if you do the pendulum gig, an oscope alone should suffice
« Last Edit: July 24, 2017, 01:22:00 AM by joestue »

mbouwer

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Re: Active Pitchcontrol
« Reply #801 on: July 24, 2017, 04:34:43 AM »
Because I might want to reduce the rotor outer diameter to use thicker magnets
I now have fastened the 46 magnets 20x10x2 with cellotape.

mbouwer

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Re: Active Pitchcontrol
« Reply #802 on: July 25, 2017, 10:41:34 AM »
At 60 rpm the 0,5 mm coil shows 1 volt and the 0,14 mm coil 10 volts.

mbouwer

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Re: Active Pitchcontrol
« Reply #803 on: July 26, 2017, 09:03:34 AM »
What wire thickness do I choose if I want to use the energy of the mill directly for heating?

 Meanwhile I try to improve the yaw slide bearing of reply # 589

joestue

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Re: Active Pitchcontrol
« Reply #804 on: July 27, 2017, 12:15:30 AM »
What wire thickness do I choose if I want to use the energy of the mill directly for heating?

 Meanwhile I try to improve the yaw slide bearing of reply # 589
Ultimately it doesn't matter. as long as the practical voltages and currents produced by the alternator are within reason.

amps below what wouldn't be cost effective to run the transmission line.. volts below what would kill you if you touch it.. if that's something you care about..

personally i'd wind it for a voltage that corresponds to the normally available resistances of standard heating elements.. in the range of 1500 watts for 120 volts, or 3500-4500 watts for 240v water heater elements.. according to the amount of wind power you can get.

what diameter of blades are you going for?

mbouwer

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Re: Active Pitchcontrol
« Reply #805 on: July 27, 2017, 01:01:52 PM »
As for the generator:
say 50 volts max?

mbouwer

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Re: Active Pitchcontrol
« Reply #806 on: July 28, 2017, 06:13:41 AM »
simplified welded yaw bearing sprocket.

joestue

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Re: Active Pitchcontrol
« Reply #807 on: July 28, 2017, 09:59:20 AM »
As for the generator:
say 50 volts max?

And how much power are you going to get from the blades at what rpm?


mbouwer

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Re: Active Pitchcontrol
« Reply #808 on: July 28, 2017, 03:07:55 PM »
With a gearbox and an asynchronous motor as generator we have made ( with varying degrees of success ) blades up to 6 m. diameter.
Max 60 rpm. With active pitchcontrol applied that is no problem.

With this generator, I don't know yet what output I can get.
Only then I can determine the blade diameter.
« Last Edit: July 28, 2017, 03:20:47 PM by mbouwer »

mbouwer

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Re: Active Pitchcontrol
« Reply #809 on: July 29, 2017, 07:13:14 AM »
The top of the mast as a pole for a new test stand.