Abstract: The invention provides a power tool, a motor and a rotor thereof. The rotor includes a housing, a rotating shaft fixed on the housing, a yoke accommodated in the housing, and permanent magnets mounted on the yoke. The housing includes a bottom wall and a sidewall extending from an outer periphery of the bottom wall in an axial direction of the rotor. The rotor further includes a cooling fan, the cooling fan is located at an axial distal end of the sidewall away from the bottom wall. The rotating shaft, the yoke, the permanent magnets, the cooling fan and the housing are formed into a non-detachable whole by overmolding.

Abstract: The invention discloses a magnetic core, which includes a ring-shaped body portion and a plurality of magnetic pole portions connected to the body portion. The magnetic pole portions are arranged on an inner surface of the body portion in a circumferential direction. The body portion and the magnetic pole portions are connected to each other. Each of the magnetic pole portions is triangular and includes a top end and two free ends. The top end is connected to the body portion. Two side surfaces on both sides of the top end of the magnetic pole portion are respectively opposite to and spaced apart from an inner surface of the body portion to form a first receiving groove and a second receiving groove, the first receiving groove and the second receiving groove are used for receiving magnets, and the first receiving groove and the second receiving groove have open ends in an inner surface of the magnetic core.