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Author Topic: power transformer Bedini  (Read 4864 times)

Offline pinestone

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power transformer Bedini
« on: May 02, 2009, 04:19:03 AM »
I started this project with a power transformer I took out of an old transistor
amplifier (1960's).

First, I removed the laminated core pieces from the transformer (not easy).
Then, I reassembled it, using only the 'E' pieces.
I cut off the top and bottom of the 'E' with a hacksaw-
making it into a 'T' laminated core.

I unwound one of the secondary windings, because they were low
impedance and pretty much useless for a Bedini circuit.

I drive the other secondary windings from the output of the
transistor, and used the primary winding to trigger the transistor.

My first experiment used six 1.2 T cylinder magnets on the rotor,
but I discovered the rotor diameter was too small to run efficiently.
I took off three of them and it runs great.

The driver circuit draws about 125 mA while running on a full charge.
I haven't checked the rotational speed, but I think its around 2500 rpm.

Using a laminated core reduces hysteresis losses and increases speed.


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power transformer Bedini
« on: May 02, 2009, 04:19:03 AM »

Offline Nabo00o

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Re: power transformer Bedini
« Reply #1 on: October 07, 2009, 03:21:31 PM »
Very smart design Pinestone!
I guess the problem with neodymium magnets originally was that the small core would be over saturated and not work properly, laminated steel however does have a very high permeability so it should work great.

So basically you make the motor capable of running with much larger torque for the same size, with the same number of coils. This could also be as smart way to reuse broken transformers  :)

Julian

 

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