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Servo motors come in many shapes and sizes, from small horsepower hobby motors to larger horsepower industrial motors. Most servo motors have the look and operation of a classical motor; that is, stator, rotor, and an output shaft which is connected to some other component to transmit motion. But not all applications have a need for an output shaft; in other words, in some applications, the shaft only gets in the way.
A special class of servo motors are ones with hollow shafts, also known as hollow bore motors. The defining characteristic of such motors is the hollow space through the center portion of the motor which makes it possible to pass various supplies through the center such as power cables, piping or hoses. In many cases, this simplifies the design of many systems including industrial robots and other machinery.