Electric variable inertia apparatus

An electric variable inertia apparatus comprising:

• a servo drive device (100) to provide a variable rotatory driving force;
• a planetary gear mechanism having
• a ring gear (230) being connected to and driven by the servo drive device (100) and having a toothed inner surface;
• a planet gear assembly (220) being mounted in and engaging the ring gear and having
• a planetary frame (221) connected to an external input device (900);
• and
• multiple planet gears (222) being mounted on the planetary frame (221) and meshing with the toothed inner surface of the ring gear (230);
• and
• a sun gear assembly (210) having
• a rotated shaft (212) having a front end and a rear end;
• and
• a sun gear (211) being mounted securely on the front end of the rotated shaft (212) and meshing with the planet gears (222);
• and
• a load assembly (300) having a kinetic energy storing device (301) being connected securely to the rear end of the rotated shaft (212) of the sun gear assembly (210) and rotating simultaneously with the rotated shaft (212) to generate rotational inertia;
• whereby by controlling the servo drive device connected with the ring gear at a specific rotational velocity according to the rotational velocity of the planetary frame connected to the external input device, the kinetic energy storing device is rotated to generate a widely ranging rotational inertia to react to the external input device.