An electrical machine includes a stator having a stator winding and a secondary transformer coil. A focal position in a first direction of the first lens is set in the vicinity of the second lens array in the optical direction of the light beam irradiated from the first lens. The engagement portion may be generally U-shaped and includes opposing latch arms configured to accommodate the body of a fiber optic connector. Wiring layers are disposed on the surface of interlayer insulating layers.