ROTOR OF SYNCHRONOUS MOTOR.

摘要

A rotor of a synchronous motor according to the present invention includes a plurality of permanent magnets (12) radially disposed around a shaft (10), and a plurality of laminate core members (14) disposed around the shaft (10) to clamp each permanent magnet (12) and serving as magnetic poles. The permanent magnets (12) are extended as a continuous member substantially along the full length of the laminate core members (14). Each laminate core member (14) is separated substantially in the middle by a disc member (24). The disc member (24) includes a shaft hole (26) at the center into which the shaft (10) is fitted, and a plurality of magnet engagement holes (28) around the shaft hole (26). Each magnet engagement hole (28) has a peripheral edge portion (32) having substantially the same profile as the section of the permanent magnet (12) and is formed in substantial alignment with each permanent magnet (12). Accordingly, each permanent magnet (12) is held at a predetermined position in a radial direction by the magnet engagement hole (28) of the disc member (24) against an external direction acting outward relative to the radial direction due to centrifugal force, etc.