Permanent magnet rotor and electric motor incorporating the rotor

摘要

A permanent magnet rotor includes a shaft, a rotor core fixed to the shaft, and multiple magnet sets. The rotor core has multiple groove sets for receiving the magnet sets. Each groove set has two grooves spaced apart by a first section of the rotor core. The first section has a width gradually decreasing from a radially inner end to a radially outer end. Each groove has a width gradually increasing from a radially inner end to a radially outer end. Each magnet set includes two magnets respectively received in the grooves of a respective groove set. The magnets of a magnet set are magnetized in a same direction, and every two adjacent magnet sets are magnetized in contrary directions creating multiple magnetic poles. The number of magnetic poles is equal to the number of magnet sets.

主权项

1. A permanent magnet rotor comprising:
a shaft; a rotor core fixed to the shaft, the rotor core defining a plurality of groove sets, each groove set comprising two grooves which are spaced with a first section of the rotor core located there between, the first section of the rotor core being continuous, the first section having a width measured in a circumferential direction of the rotor core gradually decreasing from a radially inner end to a radially outer end, each groove having a width measured in the circumferential direction of the rotor core gradually increasing from a radially inner end to a radially outer end; and each first section comprising two opposite sides, portions of the two sides adjacent to a radially outer end being parallel to each other; a plurality of magnet sets, each magnet set comprising two magnets respectively received in the two grooves of a respective groove set, each magnet comprising a plurality of magnet portions locate around a border of the groove in which it is received, with an open center formed between the magnet portions, the two magnets of a magnet set are magnetized in a same direction, every two adjacent magnet sets are magnetized in contrary directions to thereby form a plurality of magnetic poles of the rotor, and the number of the magnetic poles of the rotor is equal to the number of magnet sets.