Muller Dynamo

[T-1000]

Something interesting?...

Today i attempted to use the bemf from the drive coil to try and reduce input current as described on totallyamped.net. The drive circuit i'm using is the one from that site, page 3 fig. 7. I hooked up the fly back path as shown but it really didn't reduce the input current. It does fill the cap to 110v. So i decided to also hook up a small bulb across the cap and it caused the motor to accellerate with no increase in input current, bulb fully lit. Current went down due to the speed increase. The bulb is a small led bulb that contains 4 leds. I did the same to the second drive coil and it also caused accelleration. 

I don't understand why, can anyone explain this for me? I was just attempting to use the back emf and end up with accelleration!?

BEMF under load creates electromagnetic field on coil what matches magnet polarity and gives mechanical kick needed for driving motor...

[Danas]

I used this circuit and unfortunately was unable to get hall to switch on.  What is the Hall part number you used if I may ask? The problem I encountered is that hall would give negative to ground and this circuit needs positive output. I hope my interpretation make sense.  I used US5781EUR. I could use signal inverter, then again you managed to make it work hence the query.

Dav.

Something interesting?...

Today i attempted to use the bemf from the drive coil to try and reduce input current as described on totallyamped.net. The drive circuit i'm using is the one from that site, page 3 fig. 7. I hooked up the fly back path as shown but it really didn't reduce the input current. It does fill the cap to 110v. So i decided to also hook up a small bulb across the cap and it caused the motor to accellerate with no increase in input current, bulb fully lit. Current went down due to the speed increase. The bulb is a small led bulb that contains 4 leds. I did the same to the second drive coil and it also caused accelleration. 

I don't understand why, can anyone explain this for me? I was just attempting to use the back emf and end up with accelleration!?

[freenergy850]

I used this circuit and unfortunately was unable to get hall to switch on.  What is the Hall part number you used if I may ask? The problem I encountered is that hall would give negative to ground and this circuit needs positive output. I hope my interpretation make sense.  I used US5781EUR. I could use signal inverter, then again you managed to make it work hence the query.

Dav.

The one difference in my circuit is i used a mosfet driver(inverting type) because in my initial test of the circuit, i had the same problem. The hall i used is a3144 like romero. Tc4422 mosfet driver.

[Overschuss]

Hi Overshuss

really great work!

some decent laminate cores can be made from chopped-apart microwave oven-transformer cores - they will end up square shaped however probalby wont matter too much at all....

another idea (from Phil Wood) is to get some "florist wire" that is usually green-collored soft-steel wire, and they have a coat of some sort of green varnish on them already - they use this wire for flower-arrangements...hobby stores and flower shops should have it.

Anyways you can bunch together a bunch of lengths of this varnish-coated florist-wire into a rod-shape, and there is nice laminate core too...

Hi konehead,

thanks a lot for this good suggestions, i will give it a try. I guess i can find this florist-wire in our local hardware store. But a microwave oven-transformer, mmhhh..., i have to look.

I've ordered yesterday some Permalloy I-Cores, 5 x 10 x 35 mm, those with relatively low Permeability, although cheap. I'm curious to see how they behave.

[kEhYo77]

Yesterday I finished my new rotor: 6 x N52 Neos NN. Now the tricky part: generator coils. I am going to go with 50/50 magnetite powder/pure iron dust mixed with resin for the cores and see what happens...