Rotational drive device, substrate processing apparatus, and rotational driving method

A substrate processing apparatus comprising:

• a processor including a vacuum container that accommodates a substrate therein and configured to perform a processing on the substrate;
• and
• a rotational drive device configured to rotate the substrate in the vacuum container,
• wherein the rotational drive device includes:
• a first rotator including a rotating shaft, a rotating portion of at least one slip ring, and a housing positioned outside the vacuum container, the first rotator being configured to rotate with respect to the vacuum container and a fixed portion of the at least one slip ring;
• a plurality of second rotators configured to rotate with respect to the first rotator;
• a plurality of drivers accommodated in a motor box fixed to the rotating shaft and accommodated within the vacuum container, the plurality of drivers being configured to rotatably drive the plurality of second rotators, respectively;
• and
• a plurality of driver controllers accommodated within the housing and configured to control rotation of the plurality of drivers, respectively, and each of the plurality of drivers is connected to one another by a communication network,
• the rotating shaft, the rotating portion of the at least one slip ring, the housing having the plurality of driver controllers accommodated therein, and the motor box having the plurality of drivers accommodated therein, all rotate together as the first rotator, and
• the rotating shaft extends vertically past a through-hole in an upper surface of the housing.