Motor assembly

A motor assembly, comprising:

• a frame comprising a casing and a fixing portion, wherein the casing comprises a bottom portion, the fixing portion is disposed on the bottom portion;
• a rotor comprising a hub, a first hollow portion and a plurality of blades, wherein the hub comprises a top surface and a bottom surface opposite to each other, the first hollow portion is concavely formed from the bottom surface of the hub toward the top surface, and the plurality of blades are disposed around the hub;
• a winding component comprising a first end and a second end, wherein the first end of the winding component is disposed in the first hollow portion of the rotor;
• a circuit board;
• and
• a protection component disposed between the winding component and the bottom portion of the casing and comprising an inner ring portion, an outer ring portion and a base, wherein the inner ring portion comprises a second hollow portion and a first concave, the second hollow portion is disposed in a center of the inner ring portion, the fixing portion is penetrated through the second hollow portion and in the first hollow portion, the first concave is concavely formed on one side of the inner ring portion facing the hub, the outer ring portion comprises a second concave, the second concave is concavely formed on one side of the outer ring portion back to the hub, the base is connected with the inner ring portion and the outer ring portion, and the base is located between the circuit board and the hub, the second end of the winding component is disposed in the first concave, and the bottom portion of the casing toward the hub is at least partially received within the second concave.