초록 ▼

A permanent magnet rotor includes a rotor shaft, a yoke mounted on the rotor shaft to form a magnetic path, a plurality of permanent magnets secured to the outer surface of the yoke, and a non-magnetic metallic cylindrical cover mounted on the permanent magnets. The cylindrical cover has a plurality

A permanent magnet rotor includes a rotor shaft, a yoke mounted on the rotor shaft to form a magnetic path, a plurality of permanent magnets secured to the outer surface of the yoke, and a non-magnetic metallic cylindrical cover mounted on the permanent magnets. The cylindrical cover has a plurality of axially equidistantly spaced grooves defined in the outer surface thereof so as to extend circumferentially thereof. The cylindrical cover may have a continuous spiral groove in place of the plurality of axially equidistantly spaced grooves.

대표청구항 ▼

[ What is claimed is:] [1.] A permanent magnet rotor comprising:a rotor shaft;a yoke mounted on said rotor shaft to form a magnetic path;a plurality of permanent magnets secured to an outer surface of said yoke;a non-magnetic metallic cylindrical cover mounted on said permanent magnets and having at

[ What is claimed is:] [1.] A permanent magnet rotor comprising:a rotor shaft;a yoke mounted on said rotor shaft to form a magnetic path;a plurality of permanent magnets secured to an outer surface of said yoke;a non-magnetic metallic cylindrical cover mounted on said permanent magnets and having at least one groove defined in an outer surface thereof so as to extend generally circumferentially thereof; andwherein said at least one groove opens in a radially outward direction and is closed at a radially inner part thereof so as to block any broken pieces of said permanent magnets from escaping radially outwardly through said annular cover.