Getting the most out of nature´s laws ¿ towards more efficient electrical and magnetic machines

Electrical and magnetic machines are all designed and built from experience. The so-called ´laws´ that govern their behaviour are, of course, the laws of electromagnetic induction, but when it comes to making ´better´ machines and, in particular, more ´efficient´ machines, it is human ingenuity rather than a long computer program based on Maxwell´s equations that tends to make the real progress.