PRIUS skrev:
Jo all förlusten brukar bli värme men frågan är var den uppstår, vi vet att svag elektromagnetisk strålning kan också värma upp vävnader (som i microvågsugnen) 15% av en 100kW laddare skulle kunna göra att det blev rejält svettigt för den som utsatts för elektromagnetiska strålningen…
i
http://batteryuniversity.com/learn/arti ... hout_wires står det
Citat:
The WPC was very careful when releasing Qi; the first version has a power limit of 5 watts. A medium-power version of up to 120 watts is in the works but this norm must meet stringent radiation standards before release. There are health concerns because the devices operate in close proximity to human activity at a radio frequency ranging from 80–300kHz. Some stations transmit at 915MHz, the frequency used to heat food in microwave ovens.
Electromagnetic energy from radio towers, mobile phones, Wi-Fi, routers, and now wireless charging, are categorized as non-ionizing radiation and are believed to be harmless. Ionizing rays from x-rays, on the other hand, have been shown to cause cancer. As the number of non-ionizing devices increases, people begin to question safety. Regulatory authorities are waiting for evidence and will only impose restrictions if a health risk can be scientifically proven.
Meanwhile, parents object to schools installing Wi-Fi, and homeowners protest about electric meters that communicate data without wires. Radiation from wireless chargers may be seen as harmless because they do not transmit intelligence. In most cases, the household radiation is low enough not to worry, but it is the field strength and close proximity to the source that could add to potential harm.
Charging EVs without plug and cable offers the ultimate in convenience as the driver simply parks the vehicle over a transmit coil. Engineers talk about embedding charging coils into highways for continuous charging while driving or when waiting at a traffic light. While this is technically feasible, cost, efficiency and radiation issues at these higher powers are insurmountable challenges.
At a transfer efficiency of 80–90 percent, 10–20 percent of the power is lost. This reflects in a substantial energy cost to the user and should be calculated as a decrease in drivable distance per watts. Applied to a large vehiclepopulation, this goes against the efforts to conserve energy. Daimler’s Head of Future Mobility, Professor Herbert Kohler, says that inductive charging for EVs is at least 15 years away and cautioned about safety. The potential radiation of EV charging is higher than Wi-Fi or talking on a mobile phone; it could also endanger people wearing a pacemaker.
PRIUS skrev:
Is i vägen gör tydligen inget för resonansladdning har jag läst.
Ingen verkar oroa sig för kraftiga magnetfält när man åker tåg där effekterna är mycket högre än bilarnas lägre effekter.
Jag vet inte om dessa mera de är direkt jämförbara men det finns väll en förhöjd risk att t ex drabbas av leukemi för de som bor nära högspänningskablar elle jobbar som tågförare? Se ex
http://www.miljomagasinet.se/artiklar/radio30.htm