Electric motor

摘要

An electric motor has a wound stator and a permanent magnet rotor. The rotor includes a shaft, a hub fixed on the shaft, a plurality of rotor core segments and magnets fixed around the hub. The rotor core segment includes at least two rotor blocks inwardly extending from the innermost portion thereof. The hub includes a plurality of hub blocks equidistantly and outwardly extending from the outer surface thereof. The rotor blocks of each rotor core segment engage with at least one hub block to fix the rotor core segment to the hub. The number of rotor blocks is greater than the number of hub blocks.

主权项

1. A rotor for an electric motor, comprising:
a shaft; a monolithic hub fixed to the shaft and comprising a plurality of hub blocks equidistantly and outwardly extending from an outer surface thereof; a plurality of rotor core segments fixed to the hub; and a plurality of magnets fixed between respective adjacent rotor core segments, wherein each rotor core segment comprises at least two rotor blocks inwardly extending from a radially innermost portion thereof, the rotor blocks of each rotor core segment engage with at least one hub block to fix the rotor core segment to the hub, the number of rotor blocks being greater than the number of hub blocks, the radially innermost end of each magnet being in contact with the outer surface of the hub and being closer to the shaft at a point adjacent the rotor block than the radially innermost end of each rotor block, wherein an engaging interface is formed between the radially inner most end of each rotor block and a radially locating surface of a corresponding hub block, the radially locating surface of the hub block located outside of the outer surface of the hub, the outer surface of the hub bein closer to the shaft at a point adjacent the engaging interface than the engaging interface.