Rotary encoder disks are round or disk-shaped and have evenly-spaced holes or markings around their perimeter

DC motors are most commonly used in variable speed and torque applications.

DC servomotors are generally small and powerful for their size, and easy to control.

Rotary tables are used to position items so that they can be machined, worked, or assembled.

Incremental rotary encoders are multi-turn sensors that use optical, mechanical, or magnetic index-counting for angular measurement.

Linear encoders sense and digitize linear position change for positional measurement and feedback to control systems

Absolute rotary encoders use optical, mechanical, or magnetic indexing for angular measurement.