To reduce a magnetic gap between the magnetic core of a magnetism- generating mechanism and a disc constituted of the soft magnetic metallic plate of a rotating drive part, without changing a geometrical gap by drawing attention to the structure of the rotating plate of a rotating drive part in order to improve further the rotational motive force.
A flat-type induction motor serving as this exchanger is formed so that a rotating mechanism part (rotor) and a magnetism-generating mechanism (stator) are of freely separable constitution and non-separable integrated constitution respectively. The rotating plate of the rotating mechanism part is formed by fitting a plate-shaped piece 7b constituted of soft magnetic material into a perforated disc 7c constituted of a good conductor metallic material and its perforated part 7a, and stacking a disc constituted of a soft magnetic metallic plate on it.
NOZAWA KAZUO
ARAI KAZUO
