Abstract: An annular magnet assembly for a dynamoelectric machine includes a plurality of arcuate permanent magnets disposed in an annular array and a frame member of a non-magnetic material for rigidly connecting the magnets together. The magnets are disposed in end-to-end abutment to form the annular array, both ends of each magnet being cut to form a recess in the inner or outer peripheral surface of the annular array at the respective abutments of the magnets. The frame member comprises a pair of annular portions which tightly engage the opposite sides of the annular array and ledge portions extending through the recesses to connect the pair of annular portions together.

Abstract: An identification lamp is mounted on a rotary member which is rotatable on a stationary shaft, for rotation about the shaft as the member rotates. The shaft carries a stator having permanent magnets while a rotor assembly is fixedly mounted on the rotary member and includes a coil which rotates around the stator together with the member. The lamp is energized by an electric power developed across the coil, and means is provided for selectively deciding whether the lamp is to be energized or deenergized. The application of the invention to the wheel of a bicycle is disclosed.