Air motors used for starting some auxiliary diesel engines are generally known as what type of motor?

Air motors used for starting auxiliary diesel engines are typically referred to as vane motors. This type of motor operates on the principle of rotary motion, utilizing vanes that slide in and out of slots on a rotor, which creates chambers that expand and contract as the rotor turns. This design allows for high torque and smooth operation, making vane motors particularly effective for starting engines where a quick burst of power is necessary.

In contrast, piston motors operate using varied compression and expansion of a gas in a cylinder, which may not provide the rapid acceleration needed for engine starting. Centrifugal motors often rely on the forces created by rotating masses and are not typically suited for the applications of starting diesel engines. Rotary motors encompass various designs, but the specific attributes of a vane motor provide the unique advantages needed for efficiently initiating the operation of auxiliary diesel engines.