Patent ID: 9225209
Filing Date: 2015-12-29
Classification: H02K

Abstract:
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.