Back onto the topic, an update on wireless charging methods
How Wireless EV Charging Works
- Thread starter bernardgreen
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That will remove the trip hazard of the charging lead, but can't see how it will speed up charging.
Or how it can be sufficiently efficient, to make it worthwhile. The losses will be tremendous.
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Will it also charge my watch, or in some cases phones?
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As I've said before (and attracted some flak
, I don't think it's true 'efficiency' that you're talking about but, rather 'effectiveness'.As I've said, inductive coupling can be useless as a means of effectively transferring electrical energy, but nevertheless n may be very 'efficient'.
As I've said before (and attracted some flak
No, I really meant 'losses', energy just wasted, heating the environment, the surroundings, and the vehicle chassis due to eddy currents.
As I keep saying, there are not necessarily any major 'losses' (wasted energy) - which, if present, would represent true 'efficiency problems'.
However a system of inductive coupling can be very ineffective (very little energy transferred, hence very 'slow') without there being appreciable 'losses' (i.e. 'poor efficiency'). In the real world, there will obviously always be some actual losses (hence less than 100%efficiency),but not necessarily very much.
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He's strawmanning again.
I didn't understand why you said that the first time, and nor do I understand why you have repeated.
As you quoted, Harry referred to " 'losses', energy just wasted, heating the environment" - which, if it occurred, would indeed be an indicator of poor efficiency. However, as I keep saying, yet no-one seems to understand, 'ineffective' transfer of energy by (weak) inductive coupling does NOT necessarily have to be associated with such losses/wastage (i.e. poor efficiency, in the true meaning of the word).
To cite a sort-of analogy, a power source capable of providing only a few mA, but at an appropriate voltage, would be a very 'ineffective' way of charging a car battery (since it would 'take forever' to charge the battery) but that doesn't mean that it couldn't be very 'efficient'.
I'm used to people here being quite upset by the incorrect use of terminology, which is why I pointed out that people appeared to be using the words 'efficient' and 'efficiency' to refer to things other than what those words actually mean. The energy transferprocess we've been talking about may,of course, in some cases be inefficient as well as 'ineffective', but that is not necessarily the case.
It rather seems so
Perhaps, but that gets a little more complicated, since some people would probably say that 'effective' encompasses at least some degree of 'efficient' - i.e. a power transfer system might be 'effective' in the sense that it delivered the required amount of energy to the load, but if it were very inefficient, such that a lot of supplied power was 'wasted', rather than transferred to the load, some might well question whether it really was an 'effective' (or, at least, sensible!) way of doing things.
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You start out by telling people who discuss percentage efficiency of wireless car charging that they are are really talking about something different that you can't define, that might be the rate of transfer of power compared with some imagined ideal. Then you tell them that because they are not talking about real efficiency they are talking nonsense. So you are telling people that they are claiming something different to what they are talking about and then telling them that they are wrong. All the discussion that mention an efficiency percentage has been about exactly that. Only you introduced the strawman of rate of charging up a car or whatever it is you are talking about. That would not be measured in %, as it would have some element of time in its measurement, like % charge/ hour, or some such. I would be interested in your evidence that I was lying when I said I was referring to absolute efficiency.
Speed of charging is clearly important, but what was being discussed was, as I said before, how much power gets wasted, as the net amount of power that will be used by cars will be a significant proportion of the country's generated power, so the waste will also be significant.
As I've said umpteen times, poor/slow energy transfer does not, per se, mean that there is necessarily a lot of energy 'wastage'.
" I'm out ".
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