Rotor assembly and motor comprising the same

A rotor assembly, comprising:

• 1) a rotor core;
• 2) a plurality of permanent magnets;
• 3) a plastic body;
• wherein:
• the rotor core comprises an inner core and a plurality of outer cores surrounding the inner core;
• the inner core comprises an axial through hole;
• the plurality of outer cores is circumferentially disposed at intervals around the inner core;
• a radial groove is formed between every two adjacent outer cores;
• and the plurality of permanent magnets is embedded in a plurality of radial grooves, respectively;
• the plurality of radial grooves each comprises a first opening away from the inner core and a second opening towards the inner core;
• every outer core comprises a first end away from the inner core and a second end towards the inner core;
• the first end comprises two first hooks disposed on two sides of the first end, respectively;
• the first opening of every radial groove is located between a first hook of an outer core and a first hook of a next outer core;
• the second end comprises a bulge;
• the bulge protrudes towards the second opening to form two second hooks;
• and the plurality of permanent magnets each is clamped between the two first hooks and the two second hooks;
• the inner core comprises an outer surface;
• the outer surface protrudes towards the second opening to form a plurality of spaced teeth;
• the plurality of spaced teeth each is staggered with or is opposite to the second opening;
• and
• the plastic body is disposed in gaps between the inner core and the plurality of outer cores.