SYNCHRONOUS MACHINE

PROBLEM TO BE SOLVED: To improve the permanent magnet holder of a synchronous machine, simplify its construction, realize easy and low cost manufacturing method, and furthermore, securely position a rotor in a radial direction and in an axial direction by a simple method, when the rotor is assembled. SOLUTION: A holder 7 is constituted of two holding rings 1a and 2a which surround a field system 9 at their centers. Both the holding rings 1a and 2a are pressed against each other, and furthermore, the outlines of the holding rings 1a and 2a are extended to the lower sides of nail poles 10. The holding arms 4 of the holding rings 1a and 2a whose number corresponds to the number of poles are bent and formed, so as to be extended into gaps and reach pole plates 11 to support permanent magnets 8. Free ends of the respective holding arms 4 have holding tabs 5 bent toward a rotor shaft. Furthermore, the holding tabs 5 are positioned in grooves 6 which are formed in the respective facing inner surfaces of both the pole plates 11 at positions facing each other.