Muller Dynamo

[Cap-Z-ro]

Quote chalamadad:

" What would he need two independent pulses for? Remember this is in the context of TDC coil-shorting. Romero said he found another way of shorting the coils. If you take another look at the top driver circuit you will notice that there is a connection from ground to the FWBR of it's neighbouring coilpair. "


Doesn't the ground also have a pulse ?

Not sure if there is any significance though.

Regards...

[chrisC]

Hi kone, thought you had peak shorting in mind. ;-) I measured current. See the sketch below. The connection might have been to the other AC leg, don't remember for sure.
....

Here is was Romero answered:

"The 2 driving coils are running independently, not activating at the same time, that is what I need, to
have the second coil activating when the other one is completely off."


NOW, when comparing this statement to the actual build (see image below) you will notice that the halls are mounted exactly at the opposite sides to each other. Rotor magnets are symmetrically mounted, this means the halls are firing simultaneously and his statement is not correct. ...

@chalamadad

Romero is 100% correct. The 2 driving coils are running independently of each other. When the small round magnet is at TDC to one sensor, the other sensor is exactly half way between the rotor magnets and do not come into play. Your perception that the sensors are exactly opposite each other in the image is not entirely correct. Remember there are 9 rotor magnets. I just checked my build I've last worked on 2 months ago but had to 'abandon' experimenting because of another  important project.

cheers
chrisC

[chalamadad]

@chalamadad

Romero is 100% correct. The 2 driving coils are running independently of each other. When the small round magnet is at TDC to one sensor, the other sensor is exactly half way between the rotor magnets and do not come into play. Your perception that the sensors are exactly opposite each other in the image is not entirely correct. Remember there are 9 rotor magnets. I just checked my build I've last worked on 2 months ago but had to 'abandon' experimenting because of another  important project.

cheers
chrisC

Not in his design. There are 8 rotor magnets. (but 9 coilpairs!) And the halls are perfectly opposite. Watch the video. There even is a hole near one of the driving coils, where the hall sensor was positioned earlier. From that position would have been alternating. But has been changed. I tested this in my configuration also and the synchronous firing gives me better speed.

[xenomorphlabs]

Raises another question. Why mounting them in line with the big rotor magnets if - at that time - he thought he would need distinct pulses?

The smaller diameter  of the small magnets would promise a smaller pulse width. But i think your observation is right that the exact 180 degree
offset of the two halls is of significance.
2 possibilities: He wanted to trigger something  relative to the same magnetic moment or he wanted to offset something in regards to the coils.

[chalamadad]

The smaller diameter  of the small magnets would promise a smaller pulse width. But i think your observation is right that the exact 180 degree
offset of the two halls is of significance.
2 possibilities: He wanted to trigger something  relative to the same magnetic moment or he wanted to offset something in regards to the coils.

Or both. One coil is attracting and one repelling. It's working well.