Variable-speed speed-up mechanism

A variable-speed speed-up mechanism comprising:

• an electric device which is configured to generate a rotational driving force;
• and
• a transmission device which is configured to change the rotational driving force generated by the electric device and to transmit the rotational driving force to a target to be driven,
• wherein the transmission device includes
• a sun gear which is configured to rotate around an axis line,
• a sun gear shaft which is fixed to the sun gear and extends in a axial direction around the axis line,
• a planetary gear which is configured to mesh with the sun gear and to revolve around the axis line and to rotate around a center line thereof,
• an internal gear of which a plurality of teeth are arranged in an annular shape around the axis line, and which is configured to mesh with the planetary gear,
• a planetary gear carrier which has a planetary gear carrier shaft that extends in the axial direction around the axis line and supports the planetary gear to be capable of revolving around the axis line and to be rotatable around the center line of the planetary gear, and
• an internal gear carrier which has an internal gear carrier shaft that extends in the axial direction around the axis line and supports the internal gear to be rotatable around the axis line,
• wherein the sun gear shaft forms an output shaft which is configured to connect to the target to be driven, the internal gear carrier shaft forms a constant-speed input shaft, and the planetary gear carrier shaft forms a variable-speed input shaft,
• wherein the electric device includes
• a constant-speed electric motor having a constant-speed rotor that is configured to rotate the constant-speed input shaft of the transmission device in a first direction, and
• a variable-speed electric motor having a variable-speed rotor which is connected to the variable-speed input shaft of the transmission device, which is formed in a cylindrical shape around the axis line, and in which the constant-speed input shaft is inserted into a shaft insertion hole penetrating in the axial direction, and
• wherein a brake mechanism which is configured to detect an abnormal state of the variable-speed electric motor, stop rotation of at least one of the variable-speed input shaft and the variable-speed rotor, and continue the rotation of the constant-speed rotor, is further provided.