When selecting, factors such as accuracy requirements, load capacity, speed, torque, and working environment should be considered. Determine the required positioning accuracy and repeatability accuracy based on the application scenario, determine the torque and load capacity based on the weight of the object to be carried and the resistance during motion, determine the speed based on the working rhythm, and also consider factors such as temperature, humidity, and the presence of corrosive substances in the working environment to select appropriate materials and protection levels.

For example, if you want to select a hollow rotary actuator rotating platform for a seafood processing automation production line, you need to consider the high humidity and possible corrosive substances in the seafood processing environment, choose materials with anti-corrosion properties and appropriate protection levels, and determine the load capacity and speed based on the weight and processing speed of the seafood that needs to be transported during the processing.