Patent ID: 7535148

Claim:
A magnetic core for an electromagnetic generator, the magnetic core comprising four magnets disposed in two magnet pairs, with each pair of magnets being assembled with a respective keeper, the two pairs of magnets being mounted in an opposing manner so that a front end of each magnet of one magnet pair is spaced, in a first direction, from and faces a front end of a corresponding magnet of the other magnet pair, the facing front ends being of opposite magnetic polarity, thereby to define in the magnetic core a pair of gaps between the front ends of the four magnets, and with rear ends of the magnets of each pair contacting a respective keeper, the magnets of each pair being mutually spaced in a second direction, and wherein the ratio between the width of each magnet in the second direction to the height of the magnetic core in the second direction is from 0.40 to 0.55.