Drum motor comparison
Can’t decide between a drum motor and an external drive for your conveyor application? This guide compares both, including a checklist.
Drum Motor vs External Drive: A Practical Selection Guide
Choosing the right conveyor drive is a crucial engineering decision with many consequences. There are essentially only two types of drives available to conveyor designers and machinery builders: the drum motor, where all components are integrated into one drive package, and the external drive, where the motor and gearbox are installed separately from the conveyor.
This guide explains what the difference is and compares the two drives on criteria like footprint, protection, hygiene, maintenance load, efficiency, installation complexity, and total cost of ownership. It also defines conditions when each drive type will be the better choice.
What Is a Drum Motor?
A drum motor is a self-contained electromechanical drive. Both the electric motor and the gearbox are enclosed inside the drum itself. It doesn’t have any external rotating components. No motor mounted to the side of the conveyor. No coupling or chain connecting the gearbox output to the drive drum.
The LAT drum motors provided by BEGE are made in Germany by Himmel Technologies GmbH. The product range includes 15 drum diameters ranging from 61.5 mm to 800 mm, power ratings from 0.03 kW to 132 kW, and maximum torque of 22,527 Nm. There are two models of LAT drum motors: TM series for normal applications, and TMRVS series in stainless steel for food production facilities.
Stocked by BEGE in the Netherlands, all LAT drum motors are quickly deliverable worldwide.
What’s the alternative?
An external drive for conveyor applications is a combination of a motor mounted outside the conveyor frame and a gear box connected to the drive drum. Usually, the connection is made using a coupling or chains. All external drive components are easily accessed for servicing purposes.
At BEGE, we offer several external drive system configurations for conveyor belts, rollers, and transport equipment:
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Helical and bevel gear motors suitable for belt, roller, and chain conveyor applications;
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Servo motors with servo drives intended for conveyor applications requiring speed regulation or positioning;
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Planetary gear units for highly compact designs with heavy-duty torque requirements.
About Himmel Technologies: Engineering of the LAT Drum Motor
Himmel Technologies manufactures LAT drum motors in Germany. More than 60 years of experience in drum motors has made Himmel a renowned conveyor drive solutions provider in airport baggage handling, logistics automation, food production conveyor systems, bulk material transfer and many other sectors.
The Himmel drum motor TM and the TMRVS series comply with DIN and EN manufacturing standards. The gearing inside the drum motors is manufactured with tolerances that enable a high efficiency up to 97% due to minimal friction losses and quiet operation. The drum motor housing contains a special lubricating oil circulating in the system to cool the drive components. Labyrinth geometry used inside the drum ensures protection against contamination in any demanding operating environment.
BEGE has been the exclusive Benelux distributor of Himmel drum motors for many years. We can supply documentation, drawings, selection software, and advice on the engineering of drum motor applications.
When to Choose a Drum Motor for Your Conveyor or Packaging Line
When considering the use of a drum motor in a conveyor drive system, one of the following reasons could be the decisive factor.
Space limitations exist alongside the conveyor
The presence of narrow frame or low clearance conditions means that it’s not possible to integrate an external motor in the conveyor layout without extending the machine footprint. A drum motor will allow to keep the conveyor within its standard dimensions because it doesn’t need additional floor area outside the belt width. Dynamic conveyor layouts like pallet and carton flow systems can benefit from extra space provided by a drum motor installation.
Strict hygiene requirements are imposed
In food processing, pharmaceutical production and other industries with washing procedures performed after each day of operation, the external surface of a regular external drive can get contaminated due to inaccessible fastening bolts, cooling fins and other elements. If a conveyor is installed in such an environment, the IP69K protection of a drum motor is the best option to go. For an overview of drive systems for sustainable food production, the enclosed drum motor architecture provides a structural hygiene advantage over any external configuration.
Impact or collision hazards are present
The use of forklifts or falling objects represents a threat to the operation of a conventional external motor and gearbox drive. In a cement plant, for instance, or a recycling facilities where bulky cargo is often handled, a drum motor would perform better because of no external moving parts susceptible to any impact or collision damage.
Continuous operation, minimal maintenance access
Conveyor applications at airport baggage handling, logistic sorting or continuous food production facilities have to run without interruption throughout the day and night. Oil-cooled construction of the drum motor eliminates the need for belt adjustments, coupling servicing or external bearing grease supply. Visual inspection of the shaft seals and the control cable is the only necessary maintenance. This reduces planned downtime and prevents unplanned stops due to lubrication problems or chain wear.
Are you considering a drum motor for your conveyor belt or packaging line?
Contact us and discover the best solution for your application.
When the Drum Motor Is the Optimal Drive System
1. Limited Space along the Conveyor Belt
With limited space in front of or under your conveyor, installing a drum motor will give you an advantage over using a regular external motor with gearbox because it will not extend the machine’s dimensions. The additional space left free by a drum motor allows you to increase the conveyor’s transport capacity.
2. Hygiene Standards Require Wash-Down Capability
In food processing, pharmaceutical, and feed production environments, conveyors face daily cleaning with steam or high-pressure water. The Himmel TMRVS stainless steel drum motor has a smooth, seamless IP69K-rated surface with no dirt-trapping fins, fasteners, or lubrication points. It withstands aggressive chemical cleaning agents and meets the strictest food safety and hygiene standards in continuous production.
3. Impact and Collision Hazards Are Present
Where forklifts operate near conveyor lines or heavy product falls from height, external drive components are at constant risk of mechanical damage. A drum motor has no exposed motor, gearbox, or coupling outside the conveyor frame. There is nothing to strike, bend, or break. Drive damage from collision or falling material is structurally eliminated from the design.
4. The Line Runs 24/7 with Limited Maintenance Access
Airport baggage systems, logistics sortation lines, and continuous production conveyors cannot afford unplanned stops for drive maintenance. The drum motor is oil-cooled and fully sealed — no chain to tension, no external bearings to grease, no belt to replace. Routine checks are limited to a visual inspection of the shaft seal and cable. Maintenance time is minimal; operational availability is high.
When a Conventional External Drive Is the Right Choice
A drum motor is not in every scenario the best choice. The following conditions favor a conventional external drive.
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Initial acquisition cost is the primary constraint
A drum motor carries a higher unit price than a comparable external gear motor. Where hygiene, maintenance, and protection requirements are low, and where initial spend must be minimized, an external drive may be the more appropriate economic choice. Total cost of ownership over a full operational lifecycle typically favors the drum motor, but the initial cost differential is real.
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Torque requirements exceed the drum motor range
The LAT TM series covers applications up to 22,527 Nm. Heavy bulk conveyors in mining, large industrial dryers, and similar extreme low-speed, high-load applications may require external drive configurations beyond this range. Bevel and helical gear motor combinations can be selected to meet these requirements.
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On-site component-level serviceability is a firm requirement
Some operations require technicians to replace the motor or gearbox independently, without removing the full drive unit from the conveyor. An external drive configuration allows this. When a drum motor fails, the entire unit is exchanged. BEGE stocks standard drum motor units in Sassenheim to minimize exchange turnaround time, but the serviceability model is fundamentally different.
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The conveyor has multiple drive points along its length
Long belt conveyors driven from several intermediate points are typically engineered with external drives sized and positioned individually at each drive station. The configuration flexibility of separate motors and gearboxes is an engineering advantage in these installations.
Selection Checklist
Use this checklist for preliminary selection of the right drive type:
| Space alongside the conveyor is limited | → drum motor |
| Conveyor belt wash down with steam/high-pressure water | → drum motor TMRVS – stainless steel |
| Impact hazard and collisions are present | → drum motor |
| 24/7 operation with minimal maintenance access | → drum motor |
| Requirements of torque > 22,527 Nm | → external drive or contact BEGE engineers |
| Serviceability of components on-site is required | → external drive |
| Conveyor powered with several drive points | → external drive |
| Initial cost considerations take place | → compare TCO; external drive has a lower initial cost |
About LAT Drum Motors at BEGE
BEGE is the authorized LAT drum motor distributor for Benelux. Himmel Technologies LAT drum motors are stocked in our warehouse in Sassenheim and available for delivery across Europe and internationally.
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TM series — standard aluminium or steel drum motors, diameters 61.5–800 mm, power 0.03–132 kW
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TMRVS series — stainless steel, IP69K rated, food-safe construction for hygienic environments
Both series can be supplied with optional components: encoders, brakes, return locks, ceramic cladding, FDA-approved coatings, etc.
Are you considering a drum motor for your conveyor belt or packaging line?
Contact us and discover the best solution for your application.