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Drum motor
A drum motor (or motorised pulley) is a geared motor drive enclosed within a steel shell providing a single component driving pulley for conveyor belts.
The drum motor concept was first recorded in 1928 but was not realised until the early 1950s when it was first produced specifically for conveyor
belt applications. The idea was to produce a compact, totally enclosed single component drive unit with high efficiency and lower frictional losses than a conventional geared motor. The new design was quick and easy to install, required no maintenance and because of its totally enclosed IP66 sealed design would be unaffected by dust, dirt grease or water. Today you see many examples of drum motor applications in airport check-in conveyors and security machines, supermarket checkstands, food processing conveyors and weighing equipment. Reversible drum motors are also used for roller shutter doors.
== Basic design ==
The drum motor comprises an asynchronous or synchronous electric motor, or hydraulic motor fixed to a stationary shaft at one end of the drum and directly coupled through the motor’s rotor pinion to an in-line helical or planetary gearbox which is fixed to the other stationary shaft. The torque is transferred from the motor via the gearbox to the drum shell through a coupling or geared rim attached to the shell or end housing (see photo inset above)
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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