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A permanent magnet rotor assembly has a rotor shaft (11), and a plurality of yokes (12) extended along the axis of the rotor shaft at circumferential intervals around the rotor shaft. Permanent magnets (13) extended along the axis of the rotor shaft are held between two adjacent yokes. A pair of end

A permanent magnet rotor assembly has a rotor shaft (11), and a plurality of yokes (12) extended along the axis of the rotor shaft at circumferential intervals around the rotor shaft. Permanent magnets (13) extended along the axis of the rotor shaft are held between two adjacent yokes. A pair of end plates (14, 15) attached to the axially opposite ends of the yokes are formed of a nonmagnetic material. Bosses (14a, 15a) fitting the outer circumference of the rotor shaft are formed in the respective central portions of the end plates. The bosses of the end plates are secured to the outer circumference of the rotor shaft by the compressive force of fastening rings (18, 19) mounted on the bosses by thermal shrinkage insertion.

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A permanent magnet rotor assembly comprising: a rotor shaft; a plurality of yokes arranged around the rotor shaft at circumferential intervals and extended along the axis of the rotor shaft; permanent magnets extended along the axis of the rotor shaft and each held between two adjacent yokes; a pair

A permanent magnet rotor assembly comprising: a rotor shaft; a plurality of yokes arranged around the rotor shaft at circumferential intervals and extended along the axis of the rotor shaft; permanent magnets extended along the axis of the rotor shaft and each held between two adjacent yokes; a pair of end plates attached to axially opposite ends of the yokes, respectively, each of said end plates being formed of a non-magnetic material and being provided, in the central portion thereof, with a boss which is secured to the outer circumference of the rotor shaft by the compressive force of a fastening ring mounted thereon by thermal shrinkage insertion.