Drum Shafts
The exposed drum shafts are used to install and fix the drum motor into the conveyor frame and do not rotate. The shaft can be a single “through” shaft where the motor and gearbox are assembled on, and fixed to, the shaft with keys or pins. However, this type of drum motor design has a limited maximum radial load due to the bending stresses caused by the normal belt tension of a conveyor and is therefore used mainly for small light duty conveyors and loads. For heavier loads the most common design is to use two separate shafts, one fixed to the motor housing and one fixed to the gearbox housing where the mass of metal from the motor and gearbox significantly increases the strength of the drum motor allowing much higher payloads and longer conveyor applications. Typically one shaft is short (stub shaft) with a consistent length and the other increases in length according to the drum shell or belt width. Over certain widths, the shaft can be further reinforced to prevent bending under high belt tension.
Read more about this topic: Drum Motor
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