Abstract: A hollow motor module as a combination of a motor and a speed reducer is disclosed. The motor includes an outer stator, a first rotor and a plurality of second rotors. The first rotor is peripherally provided with a first coil and is installed in the outer stator. Each of the plural second rotors is peripherally provided with a second coil and is installed in the first rotor. The second rotor has a coupling portion extending out of the first rotor. The outer stator has first magnets that work with the first coil to magnetically excite the first rotor to rotate. The first rotor has second magnets for the second rotors. The second magnets work with the corresponding second coils to magnetically excite the second rotors to rotate synchronously. The speed reducer is connected to the coupling portions of the second rotors.

Abstract: A hollow-type planet speed reducer includes a body. The body includes at least one driving gear driven by a power input source. The driving gear is connected to a transmission gear, and the transmission gear is connected to a first gear. Based on this, the output rotation speed can be reduced by the incorporation of the driving gear, the transmission gear and the first gear. Besides, a tubular member passes though the body and has an accommodating space to receive wires of the hollow-type planet speed reducer.

Abstract: A hollow-type planet speed reducer includes a body. The body includes at least one driving gear driven by a power input source. The driving gear is connected to a transmission gear, and the transmission gear is connected to a first gear. Based on this, the output rotation speed can be reduced by the incorporation of the driving gear, the transmission gear and the first gear. Besides, a tubular member passes though the body and has an accommodating space to receive wires of the hollow-type planet speed reducer.

Abstract: A hollow motor module as a combination of a motor and a speed reducer is disclosed. The motor includes an outer stator, a first rotor and a plurality of second rotors. The first rotor is peripherally provided with a first coil and is installed in the outer stator. Each of the plural second rotors is peripherally provided with a second coil and is installed in the first rotor. The second rotor has a coupling portion extending out of the first rotor. The outer stator has first magnets that work with the first coil to magnetically excite the first rotor to rotate. The first rotor has second magnets for the second rotors. The second magnets work with the corresponding second coils to magnetically excite the second rotors to rotate synchronously. The speed reducer is connected to the coupling portions of the second rotors.

Abstract: A manufacturing method of a thin fan comprises the steps of: providing a plastic material containing a plurality of metal particles; molding the plastic material into a housing; removing a part of a surface of the housing to form a circuit layout area at the housing; and forming a metal layer in the circuit layout area.

Abstract: A manufacturing method of a thin fan comprises the steps of: providing a plastic material containing a plurality of metal particles; molding the plastic material into a housing; removing a part of a surface of the housing to form a circuit layout area at the housing; and forming a metal layer in the circuit layout area.