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Author Topic: Pierre's 170W in 1600W out Looped Very impressive Build continued & moderated  (Read 93603 times)

Offline listener192

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Test of new MOSFET board.
Low RDS results in 5A of coil current for only 5V input.
10A for 10V with 10A recovery.
Switching node voltage has little signs of transient spike due to slow MOSFET switch off.
Slow switch on also means only 200mV of below ground ringing.
Tested  @30A, heat sink remained cool.

Clock input was TTL.
Looks like this will make a good H bridge part.

Final shot shorter period using Arduino clock. 10A requires 12.7V input



L192

Free Energy | searching for free energy and discussing free energy


Offline listener192

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Here is the answer to the rotor flux problem.
My M16 steel stator was saturating at 1.5T(purple color on previous posted plots).A linear B/H plot from FEMM demonstrates this below.


If I apply a stator model equivalent to Pierres stator i.e. 33% pole length 66% solid steel, then 1.4T is achieved with only 5A through the coils, without any other input on the rotor.
The attached flux plot shows 1.4T or 2.8T swing with 1A of counter flux representing a 236W load.There is also more flux capacity on the stator and rotor.


Pierre's  stator is unusually thick and I think we will not be able to replicate a working device without the thicker stator.

No matter how the flux is generated, if the stator steel saturates, the flux will not be fully coupled to the rotor.

Offline listener192

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Here is the Floating DC supplies circuit I have been using.
Its pretty bomb proof, even a driver failure shorting the +15V supply is recoverable if you use L series 7815 that have SOA protection.
L192

Free Energy | searching for free energy and discussing free energy

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Offline listener192

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Makes for a slow turn off @70uS but additional cap across Drain Source solves parasitic turn on spike.
Cap now hold drain voltage  after boost diode switches off. Cap discharges slowly so no dv/dt problem.
Turn on is not fast @5uS, however device doesn't get warm even at 30A
A compromise driver circuit that does the job.
 
L192

 

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