A rotary electric machine includes: a stator, a rotor and rotor fans contained in a closed type frame. In an embodiment, four corner diamonds are placed in four corners of a square area and a center diamond is placed in the gap presented by the four corner diamonds. A modulator then modulates the multiplexed signal in the OFDM scheme for transmission as OFDM symbols. Controlling such crystallite size can result in fired ceramic articles with a lower coefficient of thermal expansion and improved thermal shock resistance.