Pulse motor build off time.

[tinman]

Russ from RWG reserch will be hosting the PMBO this year by him self,as i just dont have the time to put into it this year.

But i am going to do a build,and would like you guys to join in and have a go. Lets see who has got building skills to go along with the knowledge.
TK,FarmHand,poynt99-every one,lets see what ya got

Here is the start of my build.
The Megga-G

https://www.youtube.com/watch?v=sT7DrGEWyWc

[ramset]

UUM
Has Tinsel ever joined your contest ?


I will thro some dough his way [small budget]...
or donate to some " Koala sore paw  foundation"


If he will run?


is there a prize??
thx
Chet
Ps
Are Bedeni Type motors allowed ,or P.Lindemann /Aarons work ? If so I will invite  ?
and also Rob Mason's [Evolvingape] Pulseometer  fluid pulsed mechanic power system  ??



PPS
gentleman's rules ?
No Smash talk??
or no holds Barred ??

[tinman]

All details here on the vid.

https://www.youtube.com/watch?v=4uyDQx3v1D4

[MileHigh]

This popped into my head on another thread so I am sharing it here.

An idea for anybody in the pulse motor build-off.  Coils are always energized with DC, typically from a 12-volt battery.  With a microcontroller you could drive the coil with a custom waveform.  Perhaps driving the coil with an initial  voltage over-shoot spike will give you faster repulsion force in place to meet the spinning rotor magnet, giving you higher RPMs.  The voltage spike gets the current flowing in the coil more quickly.  You can imagine a simple program where the microcontroler is triggered and then it just reads out a look-up table in memory to playback the waveform on an analog output pin.  Then you connect the analog output to a beefy voltage servo-amplifier to drive the coil.  You could do one from scratch using an op-amp connected to a big pair of transistors.  The app note for that circuit is floating around.  Or perhaps you could cheat and use a car audio amplifier.

So instead of powering the coil from a straight 12-volt battery, you are powering it from a high-current voltage servo-amplifier connected to a +/-36 volt power supply (as an example).  You can jolt the coil with a custom waveform and see how high you can push the RPM while monitoring the power consumption.  You could literally start to cook your coil if you were not careful.

You have the microcontroller reading ticks from the rotor so that the software could measure the rotor frequency.  It could then multiply the rotor frequency by 'x' to generate the clock for the outputting of the waveform.  That way the length of the customizable pulse would track and be in step with the rotor RPM.  Do you need to do some kind of averaging when you measure the RPM?

The "clock" is implemented using one of the on-board programmable timers in the micrcontroller.  When the timer counts down to zero, it triggers a software interrupt.  The software interrupt outputs the next step in the waveform, does some conditional testing, and then exits.  So the outputting of the actual waveform is done by interrupt-based code in the "background."

So there you have it:  A background interrupt-driven programmable timer function that outputs the waveform in memory (triggered by a pick-up coil on the motor) and in the foreground code you measure the rotor frequency and then multiply it by a variable 'x' to generate the output waveform clock.  If your Arduino board has an LCD display you could display the RPM also.

Once you have that running, then you can experiment with the voltage waveform that you energize the coil with.  You need a flexible trigger where you can change the angle of the trigger like on the MHOP.  The trigger determines the start of the outputting of the waveform.  Say your waveform is 64 steps in length and you have one byte for each step (0-255).   A value of 0 gives you zero volts output from the servo-amplifier.  A value of 255 gives you say 36 volts output from the servo-amplifier.   With that setup you could really push your coil, get it to smoke if you wanted to.  You may want to make the record length for the waveform table to be 128 or 256 bytes in length.  Of course you could change the  length to whatever you want.

In theory you could find a waveform for pulsing the coil that is an ideal match for the motor and gives you your maximum efficiency.  But please define your efficiency also and then measure the variables and show the calculations.

MileHigh

[TinselKoala]

How about just using _one_ very Longgggggggggg pulse of HV DC to drive the motor? Would that count? (just kidding, sort of.)

http://www.youtube.com/watch?v=tVfw-TeJ9r4  (presented mostly to show the Arduino tachometer, which also can provide the programmed timing pulses that MH is talking about)

Or an antigravity electrostatic linear or rotary PM?

http://www.youtube.com/watch?v=AX-jrlGC-aA
http://www.youtube.com/watch?v=f-aP7sk48jw


Seriously, folks, I am all out of ideas for this year's buildoff. I may be able to come up with something, but I see that LidMotor is the King of PMs and has already anticipated the design I was thinking of with his great little rotary PerPenduPetulum motor:

http://www.youtube.com/watch?v=Kij6dtkhhbE