The Ossie motor

[captainpecan]

I hate to impose on you guys but can anyone explain that top trace in my last scope shot. The noise from the motor is definitely not my Metglas rattling. Uploading a new vid now.

I am probably not the one to answer this question, because I am still trying to obtain a scope myself and I'm by far no expert.  It very well could be switch chattering.  Or a bouncy switch or something like that.  It also could have something to do with your metglas cores, and a sort of resonance happening as the current flow and the permanent magnets field are trying to battle each other to overtake the core.  I'm making it up as I go along of course, lol.  Just throwing out some ideas.

[Jimboot]

That sounds reasonable to me. Just odd to to see that high freq going through the coils punctuated by a longer wave. I think it is a build up in the coils.

[Magluvin]

Jim
The coils do have capacitance that could ring them. But what I truly believe is your proximity and orientation of the reed to the coil, the coils field pulse and the reed could be oscillating till the other reed opens then it stops.
So the reeds may not be set up for timing exactly the way you might be seeing them on the scope. 1 could be letting loose a bit earlier than the other then the other is oscillating from the field change from the coil and producing the buzz and that vibration to the table. Normally the coil when pulsed should give 1 bump into vibrating the table, but a whole bunch of quick ones like that and you have your vibration sound problem solved.
So during that time of buzz on the scope, it is probably pulling from the battery to make those buzzing pulses, but also a bunch of kick backs in bemf.

Thats me theory!  =]

Mags

[Jimboot]

Jim
The coils do have capacitance that could  them. But what I truly believe is your proximity and orientation of the reed to the coil, the coils field pulse and the reed could be oscillating till the other reed opens then it stops.
So the reeds may not be set up for timing exactly the way you might be seeing them on the scope. 1 could be letting loose a bit earlier than the other then the other is oscillating from the field change from the coil and producing the buzz and that vibration to the table. Normally the coil when pulsed should give 1 bump into vibrating the table, but a whole bunch of quick ones like that and you have your vibration sound problem solved.
So during that time of buzz on the scope, it is probably pulling from the battery to make those buzzing pulses, but also a bunch of kick backs in bemf.

Thats me theory!  =]

Mags

Thanks Mags.
I'll be adding a resistor to my Supercap today. Still find this metglas fascinating

[Magluvin]

Jim
Was messing with the idea of adding some recharge coils to the outside of your pulse coils to gather some volts from the system to get you over the hump in eff.  If this works, you could possibly run many motors on 1 battery.
Below is my vid.  It just shows pulsing a coil, capturing bemf from it and the pickup coil gathering from the first, without diminishing the first bemf. So this should be additional power for you. Even it is little, If the input current does not increase and the rotor does not slow down, its all extree.  I like that word, Extree. My brother uses it. =]

http://www.youtube.com/watch?v=P34lqMJVSmE

Mags