Pulse motor build off time.

[TinselKoala]

Chet, I appreciate your kind offer, but seriously, I have already built just about every kind of pulse motor that I have been able to think about. I do have one more that I've been working on "in the background" but it's not really anything new or especially elegant. I also have some interesting designs that I can't build, because I still don't have my machine tooling available, it's all up in Canada and probably lost by now.  The level of creativity and skill that I saw from last year's build-off was so impressive that I am humbled and in awe of the real builders out there. I'm just a dilettante with a couple of oscilloscopes and an Arduino or two, not a PM-Pro! But my brain is working on the problem and maybe I'll be able to have some kind of original idea in time to enter the competition. Right now I think my chances are kind of slim.

[MileHigh]

Well I can't resist mentioning the disk rotor with the "C" core form for the drive coil to catch both sides of the disk magnet.  And then, under microcontroller control, you start out in attraction mode, and then when the magnet passes TDC you switch to repulsion mode, and you have tweaked the voltage waveform to optimize the attraction and the repulsion phase of the rotor magnet fly-by.  We have the technology.

And you want more thinking outside of the box?  You do similar setup, but instead of a servo voltage amplifier on the output to drive the drive coils, you have a servo current amplifier.  So your waveform table in your Arduino memory is for the current through the coil, and not the voltage across the coil.  Let the current amplifier generate the voltage spikes all by itself.   Now that would be just uber awesome.

[ramset]

Good stuff fellows..!



Thx
Chet

[TinselKoala]

@MH: now that's a good idea, to have a combined attraction-repulsion drive cycle. With say 4 C-coils and 4 rotor magnets you could get to a point where the coils are essentially AC driven, more or less "on" all the time in one polarity or the other, and this would really torque the rotor around powerfully! It's not too hard to do using something like Arduino. There are several "shields" that just snap onto the main board and incorporate full H-bridge driver chips. For example:

http://www.robotshop.com/en/arduino-compatible-mega-motor-shield-1a-5-28v.html

[tinman]

You would want to start the reverse pulse right after the inductive kickback cycle over shoots the 0 volt line. This then means that the polarity of the inductor has already started to change in our favour-in the right direction I dont think you need all that stuff like the Arduino and programing,as i think a push/pull circuit triggered by opto interuptors would do just nicely.

You also know that it dosnt have to be an electric pulse motor?. It can be gas pulses,fluid pulses,or even bouncing mass pulses-->Aaron's overunity bouncing ball maybe