Patent ID: 8405275

Claim:
An electrical machine, comprising: a rotor for rotation about a rotational axis; an electroconductive coil arranged circumferentially with respect to and fully encircling the rotational axis; and a stator assembly comprising: a first lamination stack comprising a first plurality of laminae including outer laminae with one or more inner laminae therebetween, the first stack being arranged circumferentially with respect to the rotational axis on a first side of the coil for conducting magnetic flux; a second lamination stack comprising a second plurality of laminae including outer laminae with one or more inner laminae therebetween, the second stack being arranged circumferentially with respect to the rotational axis on a second side of the coil for conducting magnetic flux; and a back return material arranged circumferentially with respect to the rotational axis and extending between the first lamination stack and the second lamination stack to provide a magnetic flux path therebetween; wherein the first lamination stack and the second lamination stack are each configured with a gap extending radially through at least the inner laminae thereof to prevent a continuous electrical circuit around the rotational axis from being created in the inner laminae, and wherein the electrical machine is at least one of a transverse flux machine or a commutated flux machine.