A stator assembly for a dynamoelectric machine in accordance with the present invention includes a stator core having a plurality of core slots in a surface thereof. The vehicle-side device includes a vehicle-side transmission unit connected to a plural transmission antenna and transmitting a request signal, and a vehicle-side reception unit receiving and transmitting an answer signal. 5\xb0 with respect to the face is the major face. Adjacent components are retained together by locking means which are provided on two adjacent sides of each component. An insulation plate comprising two bilateral protruded contact elements is detachably a bottom of the back cover.