Muller Dynamo

[Khwartz]

Understand Kone, and very thanks for your reply. I think what you explain fit exactly with the schematic of your web-site you gave just up to here the link to.

But for me, it's exactly the same, just I have replaced swicht 2 by the Bid You think it couldn't work or work lesser? Cause I've read you many times advising for MOFSETs and bidMOFSETs, so now i'm very surprised that you tell me "no"! lol

Could you tell me more why you would not see Bid here?

[chalamadad]

Just connect A1 and A2 pins together to have the two diodes in parallel and use it as if it were a single diode.
(You cannot make a diode bridge from  your two such diodes because both have their cathodes connected inside the casing.)
MAke sure the AC peak voltage from the coils do not exceed 35-40V , to reach the maximum 45V reverse voltage rating.

Gyula

Thanks, gyula. So to make a FWBR I would need three of those, I see. That voltage limitation is a shame because the coil puts out up to more than 50 Volts AC. Wish I could make use of the full potential. Currently I manage to rectify maybe 50% of it which is enough to drive a second driving coil.

@Scorch: Just proceed with the original design, use original driver circuit, no special extras needed (unifilar coils is good enough), is my advice. The motor is already a mixture of different earlier devices, such as muller motor and adams motor. Do not tune for speed, rather for minimal input with max output. Good luck and keep us updated how things are developing.

[chalamadad]

I almost forgot to mention - I can give an update about the oscillating coil configuration: So far I could only get it into oscillation/singing mode if the wiring was attractive and the backing magnets repelling. Yesterday I found out it works in repelling wiring is as well. The hall had to be placed differently, in my case turned upside down facing the rotor magnets, the hall itself was above the coil. But the conclusion is that it is working with an attracting or a repelling wired coil and that means that polarity does not matter at all.

I was testing for while now with single driving coil only. Today I installed a second coil to make the driving coil a coilpair again. A first test shows that the oscillation remains but the driving force, torque and possible speed improves well compared to the single coil. The AC cap value (20nF) parallel to the coilpair did not have to be changed to get minimal current draw.

Below is a scopeshot of the oscillation waveform. Division is 1µs so one cycle takes less than 3 µs. This is above the audible range. Does anybody know typical self resonant frequency of iron powder cores? Just wonder if this might match.

Chal

[Khwartz]

But the conclusion is that it is working with an attracting or a repelling wired coil and that means that polarity does not matter at all.

Many "halls" are just contacts: one fixed the other moving and attracted or repealed under magnetic fields which comes in contact or not; nothing to have with the "hall effect"! but to know how they are exactly conceived could help sometimes to avoid double-swichings and so on

Regards.

[konehead]

Hi Khwartz
The switch coming off the coil is not right - it disconnects the coil.
That is what the motor-coil switch is supposed to be doing.,. the FWBR
"2nd switch" only connects the backemf/recoil circuit to fill cap or hit load...
that circuit is for pulse widht adjsutment for coil-shorting at peaks, not for a motor coil pulse....they are different - you modified a coil-shorting cirucit, instead you should modify a motor coil pulsing circuit wiht the FWBR and 2nd swiitch...