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A rotor of a rotary machine includes a rotary shaft, a rotor core fixed to a circumferential surface of the rotary shaft, a plurality of permanent magnets arranged on a circumferential surface of the rotor core at specific intervals along a circumferential direction thereof, conducting circuits arra

A rotor of a rotary machine includes a rotary shaft, a rotor core fixed to a circumferential surface of the rotary shaft, a plurality of permanent magnets arranged on a circumferential surface of the rotor core at specific intervals along a circumferential direction thereof, conducting circuits arranged to surround the permanent magnets, and magnetic material pieces arranged on outer surfaces of the individual permanent magnets. Each of the conducting circuits includes a pair of first conductor sections arranged between magnetic poles formed by the adjacent permanent magnets and a pair of second conductor sections electrically connecting the first conductor sections.

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1. A rotor of a permanent magnet rotary machine, said rotor comprising: a rotary shaft;a rotor core fixed to a circumferential surface of said rotary shaft;a plurality of permanent magnets arranged on a circumferential surface of said rotor core at specific intervals along a circumferential directio

1. A rotor of a permanent magnet rotary machine, said rotor comprising: a rotary shaft;a rotor core fixed to a circumferential surface of said rotary shaft;a plurality of permanent magnets arranged on a circumferential surface of said rotor core at specific intervals along a circumferential direction thereof;a conducting circuit arranged to surround at least one of said permanent magnets forming one magnetic pole, said conducting circuit including a pair of first conductor sections arranged between magnetic poles formed by said adjacent permanent magnets and a second conductor section electrically connecting the first conductor sections; anda magnetic material piece arranged on an outer surface of said at least one permanent magnet surrounded by said conducting circuit. 2. The rotor of the permanent magnet rotary machine according to claim 1, wherein said conducting circuit surrounds only one of said permanent magnets forming one magnetic pole. 3. The rotor of the permanent magnet rotary machine according to claim 2, wherein said conducting circuit is arranged on each of said permanent magnets. 4. The rotor of the permanent magnet rotary machine according to claim 1, wherein the second conductor section is a generally ring-shaped conductor disposed at both axial ends of said rotor core and electrically connected to opposite axial ends of all of the first conductor sections. 5. The rotor of the permanent magnet rotary machine according to claim 1, wherein said magnetic material piece is arranged to surround a middle part of the magnetic pole formed by said at least one permanent magnet surrounded by said conducting circuit. 6. The rotor of the permanent magnet rotary machine according to claim 1, wherein said magnetic material piece is a generally cylindrical magnetic material piece including magnetic pole portions arranged on outer surfaces of said permanent magnets and thin-walled intra-pole portions interconnecting the individual magnetic pole portions. 7. The rotor of the permanent magnet rotary machine according to claim 6, wherein the thin-walled intra-pole portions are thinner than the magnetic pole portions. 8. The rotor of the permanent magnet rotary machine according to claim 1, wherein the magnetic material piece is arranged directly on the outer surface of the at least one permanent magnet. 9. The rotor of the permanent magnet rotary machine according to claim 1, wherein the outer surface of the at least one permanent magnet on which the magnetic material piece is arranged is a radially-facing outward surface. 10. The rotor of the permanent magnet rotary machine according to claim 1, wherein the width in the circumferential direction of said magnetic material piece is smaller than the width in the circumferential direction of said at least one permanent magnet forming one magnetic pole. 11. A method of manufacturing a rotor of a permanent magnet rotary machine which comprises: a rotary shaft;a rotor core fixed to a circumferential surface of said rotary shaft;a plurality of permanent magnets arranged on a circumferential surface of said rotor core at specific intervals along a circumferential direction thereof;a conducting circuit arranged to surround at least one of said permanent magnets forming one magnetic pole, said conducting circuit including a pair of first conductor sections arranged between magnetic poles formed by said adjacent permanent magnets and a second conductor section electrically connecting the first conductor sections; anda magnetic material piece arranged on an outer surface of said at least one permanent magnet surrounded by said conducting circuit;wherein said magnetic material piece is a generally cylindrical magnetic material piece including magnetic pole portions arranged on the outer surfaces of said permanent magnets and thin-walled intra-pole portions interconnecting the individual magnetic pole portions, said method of manufacturing the rotor of the permanent magnet rotary machine being characterized by comprising the steps of:forming a magnetic material sheet having grooves which serve as the intra-pole portions and thick-walled parts which serve as the magnetic pole portions by etching a workpiece; andforming said generally cylindrical magnetic material piece by joining opposite ends of the magnetic material sheet to each other. 12. The method according to claim 11, wherein the thin-walled intra-pole portions are thinner than the magnetic pole portions.