2013 Pulsed Motor Build Off Competition Announced

[markdansie]

This year is bigger and better than ever including new rules (no rules) and pulse motors do not have to have electrical input.
This is worthwhile to follow even if you are not into pulse motors.
Russ Gries and Tinman are the organizers.


http://revolution-green.com/2013/08/25/pulse-motor-build-competition/


Kind Regards

[lightningengineer]

Hi Mark

I know it says "pulsed motor" but can TPU's be entered?  (no moving parts).  Obviously the TPU needs to do work.  1 run battery, a battery being charged and a load being operated.

[tinman]

Hi Mark

I know it says "pulsed motor" but can TPU's be entered?  (no moving parts).  Obviously the TPU needs to do work.  1 run battery, a battery being charged and a load being operated.

Hi lightningengineer
There is no definition of a pulse motor as such,but a motor must have a rotating shaft in this case.
So unless you can include a rotating shaft of some sort on your TPU,then it cant be used,as it is concidered a solid state device.

[lightningengineer]

Hi lightningengineer
There is no definition of a pulse motor as such,but a motor must have a rotating shaft in this case.
So unless you can include a rotating shaft of some sort on your TPU,then it cant be used,as it is concidered a solid state device.

No worries.  I will see if I get time to adapt it.

[MileHigh]

There will be two categories, class A. Advanced. and class B. Beginners

I can suggest a few things to up the ante for the advanced class to make it more interesting.

1.  Measure your power input and RPM and then calculate your RPM per watt of input power.  How does it vary for different input power levels?  Can you plot it on a graph?  If it does vary for different input power levels then what is the sweet spot?  How does this compare to other entries?

RPM_Efficiency = RPM/Watts_In

2.  For point #1 above, smaller motors will likely have an advantage over larger motors.  So to even the playing field one way might be to weigh the mass of your rotor in grams.  The idea being that smaller rotors with low mass are likely to spin faster per watt of input power as compared to larger rotors with larger mass so you want to try to find a way to compensate for that.

Weighted_RPM_Efficiency = ( Rotor_Mass x RPM)/Watts_In

3.  You know that air friction increases as the RPM increases.  So if you run your pulse motor at low speed its RPM/Watts_In should be better than if the pulse motor runs at high speed.  Can you actually show this with your measurements?  Are you sure that the change in RPM efficiency is due to increasing air friction alone?  Are there perhaps other effects that come into play when you compare the motor running at low RPM versus high RPM?  Does the timing of the switching come into play?  Does the time it takes to energize the coil itself come into play?

4.  If you are recovering the back spike from the main drive coil and charging the "charging" battery then calculate your charging efficiency.

Charging_Efficiency = Charging_Battery_Output_Power/Source_Battery_Input_Power

Can you demonstrate that you are making proper measurements of the input power and the "charging" battery output power?  How does it compare to the other pulse motors?  Does the charging efficiency change with RPM?  If it does change with RPM can you explain why?  Can you plot it on a graph?

If any advanced keeners out there are up to it, hopefully some of these ideas will make the investigations after the build itself is completed more interesting.

MileHigh