A rotor for a brushless motor includes a shaft, a rotor core and a number of permanent magnets. The rotor core includes inner and outer annular portions. The inner annular portion has a central hole for receiving the shaft. The outer annular portion includes a number of sector segments arranged in a ring, with adjacent sector segments defining a slot there between for receiving a corresponding permanent magnet. Radially outer ends of adjacent sector segments are interconnected by a connector. The sector segments include first sector segments and second sector segments arranged alternately. The first sector segments are separated from the inner annular portion. The second sector segments are each connected to the inner annular portion by connecting arms.