How Wireless EV Charging Works

[Harry Bloomfield]

To increase the coupling between primary and secondary, thereby increasing what I've been calling 'effectiveness' (of energy transformer). Again, if you think that there would be lots of 'losses' (poor efficiency) in the absence of a core, where do you think that the 'lost energy' would then be dissipated?

Absolutely my last post in this subject, as we do seem to be going around in circles....

The losses with be in warming the air, and assuming the vehicle has a metal chassis, in warming the chassis.

 

[JohnW2]

Absolutely my last post in this subject, as we do seem to be going around in circles....

I think I've been going 'in a straight line' (i.e. not having anything new/different to add), any 'circling' being down to others.

The losses with be in warming the air ...

Are you serious?

and assuming the vehicle has a metal chassis, in warming the chassis.

I agree that's a potential issue, which is why I wrote ...

.... If you would like a slightly easier version of that question, consider a hypothetical situation in which, other than for the intended 'receiver coil' the nearest other conductive material was a mile away from the 'sending' coil.

In practice, if such an approach were attempted, it would clearly be necessary for the vehicles to be constructed in such a manner as to prevent appreciable induced currents in the structure of the vehicle.

 

[Harry Bloomfield]

Are you serious?

Yes, of course!

 

[Harry Bloomfield]

In practice, if such an approach were attempted, it would clearly be necessary for the vehicles to be constructed in such a manner as to prevent appreciable induced currents in the structure of the vehicle.

How would you tackle that issue, perhaps glueing the chassis together, and have a plastic body?

 

[JohnW2]

Yes, of course!

Are you suggesting that an electromagnetic field can induce significant currents into air, and that large amounts of power can thereby be dissipated in that air?

 

[JohnW2]

How would you tackle that issue, perhaps glueing the chassis together, and have a plastic body?

I don't think I'd bother, since, as I keep saying, I don't see it as an effective (practical, sensible) way of transferring electrical energy to a car, even if it is an 'efficient' method.

However in other contexts there are, of course, recognised ways of reducing/eliminating induced/eddy currents, even if the objects are metallic.