Abstract: A motor module has a bearing base, a stator, a rotor, a fixing base, and a circuit board. The bearing base, the stator, and the fixing base are sequentially and securely mounted to each other. The bearing base has a bearing base casing. The stator has a stator casing. The fixing base has a fixing base casing. Two end surfaces of the stator casing are respectively connected to an end surface of the bearing base casing and an end surface of the fixing base casing. The rotor is rotatably mounted in the stator, and is rotatably mounted through the bearing base. The circuit board is mounted in the fixing base and is electrically connected to the stator.

Abstract: A motor module has a bearing base, a stator, a rotor, a fixing base, and a circuit board. The bearing base, the stator, and the fixing base are sequentially and securely mounted to each other. The bearing base has a bearing base casing. The stator has a stator casing. The fixing base has a fixing base casing. Two end surfaces of the stator casing are respectively connected to an end surface of the bearing base casing and an end surface of the fixing base casing. The rotor is rotatably mounted in the stator, and is rotatably mounted through the bearing base. The circuit board is mounted in the fixing base and is electrically connected to the stator.

Abstract: A dust cover has a base body and an outer cover. The base body is a cylinder and is made of an electrically conductive material. The base body has an axis, a bearing block, and an axial hole. The bearing block is located at an outer surface of the base body. The axial hole is formed axially through the base body. The outer cover is a circular disk and is made of an electrically non-conductive material. The outer cover has an axis, a first end, a second end, a cover body, and an axial hole. The first end of the outer cover is connected with the base body. The axis of the outer cover is the same as the axis of the base body. The axial hole is formed axially through the outer cover and communicates with the axial hole of the base body.

Abstract: A dust cover has a base body and an outer cover. The base body is a cylinder and is made of an electrically conductive material. The base body has an axis, a bearing block, and an axial hole. The bearing block is located at an outer surface of the base body. The axial hole is formed axially through the base body. The outer cover is a circular disk and is made of an electrically non-conductive material. The outer cover has an axis, a first end, a second end, a cover body, and an axial hole. The first end of the outer cover is connected with the base body. The axis of the outer cover is the same as the axis of the base body. The axial hole is formed axially through the outer cover and communicates with the axial hole of the base body.