marcos wrote: ↑
Feb 20 2019 12:21pm
I should check my notes, but at 50kV you are using switches designed for megaWatt-class converters and multilevel topologies, like a series string of several 1700V SiC mosfets or IGBTs. For less costs you would need to design a low current powerstage but with multilevel topology, fiber optic gate driver input, some very well isolated DC/DC converters for the 6 gate drivers and a way to measure such high BEMF. Sounds like a lot of dangerous work!
you won't find much on the output side of my project in your notes or any physics book.
You're spot on with the multilevel topology and well isolated DC/DC. I'm planning to use a car 12V battery with up-conversion (DC chopper plus capacitor) to 400VDC for the gate drivers - or alternatively a BMS with 120 18650 LiPo's in series... For my home-brew project I plan to use an Arduino as the brain and then to magnify the signal like this:
This times three - one for each phase plus sensing for the Arduino (33kOhm @ 5W resistors)
That's what my breadboard schematic looks like at the moment:
I certainly have to be cautious with some parts of this project (400VDC). But while the output is at 20-50kV+ - the duration of the pulses is only nano-seconds and the amps trend towards zero. As said, the input amps are only 1-3 Amps, max. 10 Amps for the bigger motor...
At 20kHz plus and only micro-amps per pulse we get as well the skin-effect where current stays on the surface of the skin and doesn't penetrate. We are in RF land and not so much in AC/DC anymore... That's basically what the conclusion of my research is: We don't only have AC & DC - there is a third way (we mostly used for over the air communications) which combines the advantages of AC and DC - and this is RF. We can build much safer electric cars and appliances this way.
I need as clean DC-pulses as possible. Pure PWM, not even a hint of a sine wave. Once I'm done magnifying the signal, you can touch both poles and all you feel is a light humming - no shocks - even at 50KV+...
The fascinating thing is: you get way more torque out of a PWM-DC motor with that method than what you'd traditionally expect. My hypothesis is, that driving a motor in this way, you're using it as well as a BEMF transformer to create torque and current. You drive it with volts instead of amps - the amps are created in the motor itself by the BEMF of the RF signal.
You're not that far off bringing up Tesla (and Tesla coils). I guess he hasn't only invented AC and pretty much everything that powers the world today. He probably was tinkering around exactly with what our research is closing into as well - but that is speculation at this moment in time.
I like to think of it like high-voltage transmission lines. They're not actually AC - they transmit a DC potential at 50/60Hz. I'm just increasing the frequency to take the danger out of it - and if this cutting edge physics I'm working on is correct, we hit the self resonance of the oscillating space quanta bubbles that are the smallest building blocks of the vacuum (the superfluid medium for the electromagnetic waves). By pulsing them with their resonant frequency (best guess at the moment is 3.6-4.0 MHz) - or it is probably easier to just hit them at a lower harmonic frequency at 20 - 400kHz. The higher the frequency, the less current you need per pulse, as long as you hit and stay with the resonant frequency or a harmonic thereof...
As a hint: have you ever wondered, why EVERY electromagnetic formula has it's equivalent in a fluid dynamic formula? It's because the vacuum IS a superfluid like medium, made of 100% space. Space isn't continuous but comes in discrete packets. The Planck length is where our 4 dimensions are truncated. There is as well space within space - and space between space. For a full explanation: https://vimeo.com/9830121
- drive a 3 phase motor with PWM / FOC
- use a high voltage RF signal to transmit the DC potential to the motor (gate driver and IRFPG50 power mosfets for example)
- use the resulting BEMF in the motor to create an incredibly efficient, high torque motor that can be used to drive pretty much anything that moves
- if successfully pulsing /synchronizing the oscillation of the space quanta that give rise to the volume of the vacuum within the electromagnetic field created within and around the motor (the higher the applied voltage, (and the bigger the diameter of the motor), the bigger the volume of the space quanta involved, the higher the torque that is achievable.
This could be a way to tap into the vast amounts of energy stored within the vacuum. One cubic meter of vacuum contains enough energy to evaporate all oceans of the earth - so far we just don't know how to extract it. This could be one way and to test this hypothesis, I have to actually build an experiment and proof it with reproducible measurements. I'm not here to waste anybody's time with romantic pseudo-science...
If that part is successful too, you could power a conventional generator with this system. The first law of thermodynamics is not violated, as it is only applicable for CLOSED SYSTEMS. The closed system in this case is our whole universe. If the full story of our reality is only 4-dimensional, this technique will not work. If our reality is 11-dimensional as proposed by Quantum Space Theory QST, based on Bohmian mechanics instead of QM, and superfluid vacuum theory SVT - there is a good chance that this thing will work.
If you wanna know more about the theory behind it: www.facebook.com/QuantumSpaceTheory/
I'd happily explain you more about it, but for that we should probably open a new thread. I didn't intend to highjack this one, but I guess questions had to be expected