You might be able to even make it automatically adjust the focus to slightly off-centre alignment, thereby making parking easier and the whole she-bang more efficient. And maybe focus vertically as well as laterally/longitudinally? MW
On 20 Jul 2014, at 19:54, Peri Hartman via EV wrote: > Another thought, Peter. Is it possible to use multiple coils to focus the > "beam"? I don't know wave theory but I believe directional radio > transmitters work by having two or more antenae. Can something similar be > done with inductive coils? > > If so, then using some sort of directional recognizer, the transmitter could > focus the beam exactly to the receiver area. I'm hoping this would reduce > risk of exposure when humans, animals are in the vicinity and also improve > efficiency. > > Peri > > ------ Original Message ------ > From: "Lee Hart via EV" <[email protected]> > To: "Martin WINLOW" <[email protected]>; "Electric Vehicle Discussion List" > <[email protected]> > Sent: 20-Jul-14 11:37:04 AM > Subject: Re: [EVDL] EVLN: BMW&Daimler developing 3-Hour Wireless Inductive > EVSE for i3 EV > >> From: Martin WINLOW >>> Not wanting to shoot your work down but I am reminded of (I think it was) >>> Lee's idea of using >>> an auto engaging charger connection which would be much more efficient, >>> much cheaper and only >>> marginally less practical. >> >> It was actually Bob Rice's solution (although the idea is no doubt even >> older). In 1968, Bob had an EV with drive-on charging. It was a bump-stop >> that you drove up against. A platform between the front wheels would slide >> sideways to center itself between the front wheels. It had two brush >> contacts on the top surface, that mated with contacts on the bottom of the >> car. The contacts were dead until the car was present and electrical contact >> was established. Simple as dirt! >> >> I know that people are often fascinated by complex solutions. Advertising >> can often talk them into paying extraordinary prices for trivial >> conveniences or hypothetical benefits. Companies like them because they can >> make a lot of money selling them (especially if they can get laws passed to >> make it a "standard"). But if you actually expect them to be widely used or >> survive in the long run, I think we'd all be better served by working on >> simpler ways of doing it. >> >> GM's Magnecharger comes to mind. A good idea, expensively implemented, >> legislated as a standard, and now a footnote in history. >> >> On an 85 KHz high power inductive charger: As an EE, I can't see how the >> charger can detect a 0.1% energy loss to some unexpected device in the area. >> And yet, that's enough power to easily heat up unintended "receivers" and >> fry sensitive electronics that by chance just happen to resonate at 85 KHz. >> How can you reassure me that this won't happen? >> >> When I was designing safety-critical consumer electronics, we'd have someone >> on the team whose *job* it was to try to "break" the system. If the guy was >> good (and he needed to be) :-) he'd come up with things we never thought of >> in our wildest dreams! So... with your inductive setup, what if you *tried* >> to find a way to trick the electronics, and steal 5-10 watts of power from >> the charger without tripping the safety shutdowns? If you can do it, then >> Murphy will probably discover some mass-produced gadget that just happens to >> do it. >> -- >> A free whistle given away in millions of boxes of Captain Crunch cereal just >> happened to be exactly the right frequency to turn off the phone company's >> long-distance billing equipment, so kids could make free long-distance calls! >> -- >> Lee Hart http://www.sunrise-ev.com/controllers.htm now includes the GE EV-1 >> controller >> >> -- >> Those who say it cannot be done should not interrupt the one who is >> doing it. -- Chinese proverb >> -- >> Lee A. Hart, 814 8th Ave N, Sartell MN 56377, leeahart-at-earthlink.net >> _______________________________________________ >> UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub >> http://lists.evdl.org/listinfo.cgi/ev-evdl.org >> For EV drag racing discussion, please use NEDRA >> (http://groups.yahoo.com/group/NEDRA) >> >> >> > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA > (http://groups.yahoo.com/group/NEDRA) > _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
