A wheel motor can include a stator adapted to be coupled to a vehicle. The tongue attachment member is fabricated having a sheath interlock member extending upward from a dorsal side of a sheath. The frame frequency f is determined from a pretilt angle \u03b8p, and is a frequency not lower than 60 Hz at a pretilt angle of 88. The carriers have a common start time, pursuant to a single MAP message, and operation synchronously to transmit an upstream transmission frame.