CEMA Technical Paper 2025-01

This free CEMA Technical Paper defines motorized pulleys (drum motors) and explains how internally powered conveyor drive systems compare with traditional external drive configurations.

The paper outlines the defining features of motorized pulleys, including hermetically sealed oil-filled construction, internal AC motor and gearbox design, heat dissipation through the pulley shell, and compatibility with VFD, soft-start, or across-the-line starting methods.

Applications are reviewed across both bulk material handling (mining, recycling, cement, aggregate, ports, underground conveyors) and food processing and unit handling (sanitary washdown systems, packaging, airport baggage handling, grocery checkout systems). The paper also outlines available options including lagging styles, backstops and brakes, stainless steel finishes, labyrinth seals, internal encoders, and electrical termination configurations.

• Document Type: Technical Paper

• Document Number: 2025-01

• Committee: Conveyor Pulley Committee

• Authors: Mike Gawinski and Benjamin Brewer (Douglas | Rulmeca)

• Intended Audience: Engineers, system designers, integrators, maintenance professionals

• Applies To: Bulk material handling and unit handling conveyor systems

• Publication Year: 2025

• Length: 7 pages

• Cost: Free

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