Patent ID: 9331532
Filing Date: 2016-05-03
CPC Classification: H02K

Claim Text:
1. A rotor for a permanent magnet brushless motor comprising: a shaft; a rotor core fixed to the shaft and defining a plurality of spaced first slots arranged in a circumferential direction thereof, and a plurality of spaced second slots, each second slot being located between two adjacent first slots and each first slot being located between two adjacent second slots; a plurality of first permanent magnets received in the first slots; and a plurality of second permanent magnets received in the second slots and ends of the plurality of second permanent magnets adjacent to the shaft directly contacting with the rotor core, wherein each second magnet is located between two adjacent first magnets and each first magnet is located between two adjacent second magnets in the circumferential direction, and the first magnets are magnetized in radial directions of the rotor core and the second magnets are magnetized in the circumferential direction, the first magnets located closer to the shaft than the second magnets, wherein each section of the rotor core located between two adjacent first magnets and a corresponding second magnet located outside of the section has a width which is gradually reduced in the radial direction of the rotor core towards the shaft; and wherein an angle formed by extending two facing sides of two adjacent first magnets is an acute angle.