Patent ID: 8492934
Filing Date: 2013-07-23
Classification: G03B,G03F,H02K

Abstract:
1. An electromagnetic actuator comprising: at least a first coil group, the first coil group including at least a first coil, the at least first coil having an elongated toroidal shape, the at least first coil having a first coil length and a first coil width, wherein the first coil length is approximately equal to a multiple of three times the first coil width; at least a second coil group, the second coil group including at least a second coil, the at least second coil having an elongated toroidal shape, the at least second coil having a second coil length and a second coil width, wherein the second coil length is approximately equal to a multiple of three times the second coil width, the at least second coil group being approximately adjacent to the at least first coil group; and a magnet array, the magnet array being configured to cooperate with the at least first coil group and the at least second coil group, the magnet array including a plurality of magnets, wherein the plurality of magnets has an associated magnet pitch, the first coil width and the second coil width being a function of the magnet pitch, wherein the at least second coil group is separated from the at least first coil group by a distance, the distance being measured between a side of the first coil and an end of the second coil.