What type of motor is required to rotate the anode within a rotating anode X-ray tube?

An induction motor is the correct answer because it is specifically designed to provide the necessary high speed and reliability required for the rotation of the anode in a rotating anode X-ray tube. This type of motor operates by inducing a magnetic field that rotates within the motor, allowing it to achieve high rotational speeds crucial for the efficient operation of the anode during X-ray production.

The efficiency and structural design of induction motors enable them to handle the continuous and heavy mechanical load involved in rotating the anode at high speeds without overheating. This is essential for maintaining the quality of the X-ray beam and preventing damage to the tube.

Other types of motors, such as DC motors, may not provide the same level of speed control or are not typically used in this application due to their mechanical brush-and-commutator configuration, which can wear out and generate heat. AC motors, while capable of operation in some industrial applications, are generally not used in the design of the rotating anode systems for X-ray tubes. Stepper motors, while precise, are not suited to the high-speed requirements for rotating anodes needed in imaging applications. Thus, the use of an induction motor is specifically advantageous for the design and functionality of rotating anode X-ray tubes.