Electric machine with metallic shield rotor

An electric machine, comprising:

• a stator;
• and
• a rotor, the rotor comprising:
• a plurality of permanent magnets carried by a non-magnetic, metallic permanent magnet carrier, the plurality of permanent magnets defining at least two magnetic poles of the rotor, the non-magnetic, permanent magnet carrier defining a plurality of elongate spacers affixed to a cylindrical outer surface of the permanent magnet carrier affixed to an outer surface of the permanent magnet carrier, the spacers circumferentially spaced apart from each other and extending axially along the outer surface of the permanent magnet carrier;
• a non-magnetic metallic foil surrounding and contacting outward facing surface of the permanent magnets and the plurality of elongate spacers;
• a carbon fiber retaining sleeve surrounding the metallic foil and the spacers;
• and
• a rotor core, where the permanent magnet carrier is interference fit over the rotor core.

A rotor for an electric machine, comprising:

• a permanent magnet carrier defining a plurality of elongate spacers affixed to an outer surface of the permanent magnet carrier, the spacers circumferentially spaced apart from each other and extending axially along the outer surface of the permanent magnet carrier;
• a plurality of permanent magnets on the outer surface between the spacers of the permanent magnet carrier, the magnets defining at least two magnetic poles of the rotor;
• a metallic shield surrounding an outward facing surface of the permanent magnets and the spacers;
• a retaining sleeve surrounding an outward facing surface of rotor, the retaining sleeve configured to retain the magnets to the permanent magnet carrier during operation of the rotor;
• and
• a rotor core, where the permanent magnet carrier is interference fit over the rotor core, where the permanent magnet carrier is non-magnetic and the rotor core is steel.

A rotor for an electric machine, comprising:

• a permanent magnet carrier defining a plurality of elongate spacers affixed to an outer surface of the permanent magnet carrier, the spacers circumferentially spaced apart from each other and extending axially along the outer surface of the permanent magnet carrier;
• a plurality of permanent magnets on the outer surface between the spacers of the permanent magnet carrier, the magnets defining at least two magnetic poles of the rotor;
• a metallic shield surrounding an outward facing surface of the permanent magnets and the spacers where the metallic shield comprises a metallic foil, where the metallic shield comprises a plurality of layers of metallic foil;
• a retaining sleeve surrounding an outward facing surface of rotor, the retaining sleeve configured to retain the magnets to the permanent magnet carrier during operation of the rotor;
• and
• a rotor core, where the permanent magnet carrier is interference fit over the rotor core.

A rotor for an electric machine, comprising:

• a permanent magnet carrier defining a plurality of elongate spacers affixed to an outer surface of the permanent magnet carrier, the spacers circumferentially spaced apart from each other and extending axially along the outer surface of the permanent magnet carrier;
• a plurality of permanent magnets on the outer surface between the spacers of the permanent magnet carrier, the magnets defining at least two magnetic poles of the rotor;
• a metallic shield surrounding an outward facing surface of the permanent magnets and the spacers where the metallic shield contacts the permanent magnets and radially outwardly oriented surface of at least one of the ends of the permanent magnet carrier;
• a retaining sleeve surrounding an outward facing surface of rotor, the retaining sleeve configured to retain the magnets to the permanent magnet carrier during operation of the rotor;
• and
• a rotor core, where the permanent magnet carrier is interference fit over the rotor core.