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Bankroetlama
Member
JohnSnowNW
Active Member
Does not seem plausible. An air-gap of 12", at 200kW, and equivalent efficiency to plugging in...nah.
Maybe a 2 kW system? There were no products or specs listed on their somewhat useless website.
Since air is such a poor conductor of magnetic fields compared to the iron used in transformers, it requires huge amounts of illegal drugs to even consider the possibility of passing the equivalent of 200 kW using magnetic field across a 12 inch air gap with an inverse square law.
Evanescent waves, microwaves, resonant circuit pumps--baffle them with bs. There are tons of videos on the websticle that look just like that one with over-unity devices and free energy claims, show some digits on a meter and lightbulbs and declare victory, jesushchrist we just solved the world's energy crisis.
Looks like someone is trying to make an efficient transfer device of money from your pocket to their bank account.
Since air is such a poor conductor of magnetic fields compared to the iron used in transformers, it requires huge amounts of illegal drugs to even consider the possibility of passing the equivalent of 200 kW using magnetic field across a 12 inch air gap with an inverse square law.
Evanescent waves, microwaves, resonant circuit pumps--baffle them with bs. There are tons of videos on the websticle that look just like that one with over-unity devices and free energy claims, show some digits on a meter and lightbulbs and declare victory, jesushchrist we just solved the world's energy crisis.
Looks like someone is trying to make an efficient transfer device of money from your pocket to their bank account.
No reason you can't do 200kW, but say it's operating at 13.54MHz (pretty typical ISM band) this requires a lot of power semiconductors, very expensive, even something like 85% efficiency using say a Class-E resonator will be dissipating 15-20kW alone in the power semis, so the charger will necessarily be very large to achieve this (think about how much heating power the average home needs - say a UK home would be 25kW - this thing is dissipating almost that much heat! Removing that won't be easy!) The antenna patch will also have to be huge. Not impossible, but not possible in that form factor.
Adm
Active Member
In Rotterdam, the Netherlands, experiments are being conducted with 11kW and 22kW and a 6 inch gap. They claim 90% efficiency.
I'd like to know what our resident experts think about it.
I'd like to know what our resident experts think about it.
22kW @ 90% means 2.2kW of heat lost just in heat between the two plates.. Secure your cats before charging!
What's the total efficiency? multiply 90% by 93% for the onboard chargers, now you're at 83% efficiency, which is pathetic.
Keep in mind, a wire of the right gauge and length has no problem being >99.9% efficient.
SomeJoe7777
Marginally-Known Member
Only AC can be sent across the air gap, so all AC->DC conversion must take place on board the vehicle. What vehicle is going to contain the AC->DC charger(s) capable of 200kW conversion other than maybe a bus or large truck/tractor? None of which are EVs at present.
135kW in the Tesla superchargers requires a large cabinet with 12 individual chargers, cooling system, control system, fans, etc. 200kW obviously would be even larger.
Efficiency of the AC transfer across the air gap can't be more than about 90% (even well-designed transformers with no air gap in their magnetic material only achieve 97%), so at 200kW of transfer, there's 20kW of heat loss in the transfer, and another 7% (14kW) in the chargers on board the vehicle, for a net 34kW of heat that needs to be removed. That's enough heat to keep a 4800 square foot house warm in the dead of winter.
20kW of heat loss at the source charging plate under the car will require a liquid cooling system.
Methinks there is something fishy with the claims here.
Plus, even if such a system were built, it would never be practical from a cost standpoint. The cost of the hardware for the car, the additional cooling systems required, and the losses in efficiency mean that an automatic articulated arm solution would be far cheaper.
135kW in the Tesla superchargers requires a large cabinet with 12 individual chargers, cooling system, control system, fans, etc. 200kW obviously would be even larger.
Efficiency of the AC transfer across the air gap can't be more than about 90% (even well-designed transformers with no air gap in their magnetic material only achieve 97%), so at 200kW of transfer, there's 20kW of heat loss in the transfer, and another 7% (14kW) in the chargers on board the vehicle, for a net 34kW of heat that needs to be removed. That's enough heat to keep a 4800 square foot house warm in the dead of winter.
20kW of heat loss at the source charging plate under the car will require a liquid cooling system.
Methinks there is something fishy with the claims here.
Plus, even if such a system were built, it would never be practical from a cost standpoint. The cost of the hardware for the car, the additional cooling systems required, and the losses in efficiency mean that an automatic articulated arm solution would be far cheaper.
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Todd Burch
14-Year Member
I vote for BS!
I still prefer my design where your car rolls over a device fixed to the floor of your garage. The simple action of pulling forward slides open a window underneath the car (via a spring-loaded catch arm) and spring-loaded rollers make contact with metallic plates.
Now you have the efficiency of wired charging and the ease of wireless charging. Plus you avoid the additional complexity of a robotically actuated charger.
Would obviously require a different car design, but certainly doable and probably much easier than falcon-wing-doors!
I still prefer my design where your car rolls over a device fixed to the floor of your garage. The simple action of pulling forward slides open a window underneath the car (via a spring-loaded catch arm) and spring-loaded rollers make contact with metallic plates.
Now you have the efficiency of wired charging and the ease of wireless charging. Plus you avoid the additional complexity of a robotically actuated charger.
Would obviously require a different car design, but certainly doable and probably much easier than falcon-wing-doors!
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Larry93428
Member
Interesting yes. But we have 130,000 cars out there that could use the arm system.
What will happen to us?
~Larry
Asciidv
Member
In London inductive charging is being trialled using Dennis buses. The pickup coil is in a box about 4 feet square by 3 inches deep in the centre of the bus floor, with about 6 inch ground clearance.
