On light-duty belt conveyors — X-ray security screening lines, small packaging transfers, belt scales and general product movement — the drive specification is approved once and then lived with for years. A drum motor, also called a motorized pulley, places the electric motor and the gear reduction inside the conveyor roller, so the belt is driven from within the drum rather than by an external gearbox, chain or coupling. The practical consequence for procurement is simple: on a light-duty line, the datasheet decides reliability more than the frame drawing does.

This reference is written as a procurement FAQ for buyers and engineers who have moved past discovery. They already know they want a drum motor; what they need now is to fix motor type, power, torque and belt pull for one specific conveyor. The questions below are the ones that most often stall a purchase order: which motor architectures exist in the light-duty band, what a rated power range actually tells you, why torque and belt pull are separate numbers, and where a light-duty drum motor stops being the right answer.

Tianjin Seaparks Machinery-Electronics Co., Ltd, which trades as SEAPARKS, is a Tianjin-based manufacturer founded in 2002 that focuses on the design and production of motorized conveyor drums. The company operates a 50,000 m² plant with 360 employees, including a 40-engineer R&D team, and reports an annual output of 380,000 units. Its compliance portfolio includes ISO 9001, ISO 14001, ISO 45001, RoHS 2.0, UL and CE certification, and its drum motors are exported to more than 50 countries.

TM80M light-duty drum motor, Ø80 mm roller, single-phase asynchronous motor with polymer gearing — the smallest drive in the light-duty range.

The Motor Architectures Behind Light-Duty Drum Motors

Light-duty drum motors are not one product family. In the SEAPARKS range they divide into three architectures: asynchronous AC motors supplied in single-phase form; asynchronous AC motors under the A-series, published in single-phase and three-phase versions; and synchronous motors published in DC or three-phase form. The architecture determines supply wiring, speed behaviour and — in practice — which models reach the highest belt pull in the light-duty class.

The model designation alone does not tell a buyer the architecture, which is why specification review matters more than catalogue browsing. The TM80M and TM113M are published as single-phase asynchronous light-duty drum motors with polymer gear transmission, minimum roller widths of 260 mm and 310 mm, and rated power of 0.034–0.11 kW and 0.12–0.18 kW respectively. The A-series — TM80A, TM113A and TM138A — uses asynchronous AC motors, with alloy steel gearing published for the single-phase and three-phase TM80A and the three-phase TM113A. Synchronous drives appear as the DC-driven DM80A and the three-phase synchronous DM113A and DM138A. Where a project specifically requires a DC synchronous drive at Ø80 mm, the DM80A is the model in this range; the TM113M is published as a single-phase asynchronous unit.

A procurement caution follows directly: confirm motor type, supply phase and gearing from the specification line on the datasheet, not from the model number or a verbal quotation. The same roller diameter can be supplied with different motor types and different supply phases.

Power Range: What 0.034 kW to 1.5 kW Actually Buys

Power figures for light-duty drum motors are published as ranges rather than single values because the same drum is built with different gear ratios and winding configurations. Across the models reviewed here, the band starts at 0.034 kW (TM80M and the single-phase TM80A) and ends at 1.5 kW (the synchronous DM138A).

Reading those numbers correctly matters more than comparing them. A rated power range describes the electrical and thermal envelope covered by available configurations; it does not state what a specific drum will deliver at the shaft. That figure depends on the gear ratio selected, which also fixes the nominal belt speed. A buyer who specifies “0.12 kW” without specifying the operating speed has specified an envelope, not a drive.

The ranges also show where each architecture concentrates. The DC synchronous DM80A is published at 0.09–0.12 kW — a deliberately narrow band, consistent with a compact unit intended for small packaging and general conveying. The Ø138 A-series models move up to 0.25–1.1 kW on the TM138A and 0.75–1.5 kW on the DM138A, which is the top of the light-duty class. At the low end of the band the deciding factors are usually supply availability and roller diameter; as power approaches 1 kW and above, the binding constraint shifts to belt pull at the drum.

Torque Characteristics: Rated Torque, Speed and Roller Diameter

Rated torque is the number that converts a light-duty drum motor into a conveyor drive. Published light-duty torque ranges span roughly an order of magnitude across the family: 2.36–22.02 Nm for the single-phase TM80A, 2.71–25.9 Nm for the TM80M, 3.49–21.89 Nm for the DC synchronous DM80A, 10.34–82.99 Nm for the three-phase TM113A, 9.94–115.99 Nm for the DM113A, 19.46–243.23 Nm for the TM138A and 27.69–273.58 Nm for the DM138A.

Two relationships explain those figures, and both are useful at the quotation stage. First, torque and speed trade against each other through the gear reduction: within one model, the highest rated torque appears at the lowest nominal belt speed in the published range. Second, torque becomes belt pull through the roller radius — because belt pull equals torque divided by roller radius, a larger roller extracts more pull from the same torque.

That relationship gives procurement a free sanity check on any quotation. For the Ø113 mm and Ø138 mm light-duty models, the published maximum belt pull is consistent with the maximum rated torque divided by the roller radius: 115.99 Nm at Ø113 mm corresponds to 2053 N on the DM113A, 82.99 Nm corresponds to 1469 N on the three-phase TM113A, 243.23 Nm corresponds to 3525 N on the TM138A, and 273.58 Nm corresponds to 3965 N on the DM138A. If a quotation shows a belt pull that cannot be reconciled this way, the specification should be clarified before the order is placed.

The TM113A is published at Ø113 mm in single-phase and three-phase asynchronous versions, with maximum belt pull of 1410 N and 1469 N respectively.

Belt Pull and Roller Width: The Binding Constraints

If torque is the engineering quantity, belt pull is the procurement one. It describes the pull the drum must transmit to move the loaded belt, and it is expressed in newtons. The light-duty range covers 534 N on the DC synchronous DM80A and 538 N on the single-phase TM80A at the low end, through 630 N on the TM80M, 705 N on the three-phase TM80A and 770 N on the TM113M, then 1410 N on the single-phase TM113A, 1469 N on the three-phase TM113A, 2053 N on the DM113A and 3525 N on the TM138A, up to 3965 N on the DM138A.

Roller width is the second binding constraint, because a drum motor must fit both the belt and the frame. Minimum roller widths in this range run from 260 mm on the TM80M to 390 mm on the DM138A: Ø80 models span 260–340 mm, Ø113 models 310–370 mm, and Ø138 models 340–400 mm. The two constraints usually move together, since raising belt pull normally means moving to a larger roller diameter, which raises the minimum roller width and may require a frame adjustment. Reviewing belt pull, nominal belt speed and minimum roller width on a single page — as in the table below — removes the most common late-stage design conflict in light-duty projects.

Choosing Between Single-Phase, DC Synchronous and Three-Phase

Single-phase asynchronous models — TM80M and TM113M — are specified where the conveyor location only provides a single-phase supply. Their published maximum belt pulls are 630 N and 770 N, with nominal belt speeds of 0.05–0.85 m/s and 0.11–1.05 m/s. They suit short, lightly loaded transfers where the load is modest and the speed can be fixed mechanically.

DC synchronous drives offer a different trade. The DM80A is published at 0.09–0.12 kW, 3.49–21.89 Nm and 534 N maximum belt pull, with a nominal belt speed range of 0.16–1.03 m/s and a 310 mm minimum roller width. Its torque band begins higher than the single-phase Ø80 options, yet its belt pull ceiling is the lowest in the light-duty family — a clear illustration that rated torque and belt pull are not interchangeable when roller diameters differ.

Three-phase models carry the highest capability for demanding light-duty duty cycles. The three-phase TM113A reaches 1469 N, the DM113A 2053 N and the DM138A 3965 N. These are the models that screening lines and higher-throughput packaging conveyors typically specify, and they are also the models most often paired with speed control requirements.

Protection Class: IP66, IP67, IP69 and the IP69K Boundary

Every light-duty model listed above is published with protection class options of IP66, IP67 or IP69, and with a housing of carbon steel or 304 stainless steel. Those options cover wet, dusty and washdown conditions within the light-duty and general conveying class.

The boundary to watch is IP69 versus IP69K. Under IEC 60529, IP69K is the highest ingress protection rating, defined for equipment that must withstand high-pressure washdown of up to 1450 psi at 80 °C. This is why hygienic drum motors for food and pharmaceutical lines are specified that way. In the SEAPARKS portfolio, the hygienic F-series — TM80F through TM216F and DM80F through DM216F — is published with IP69K protection and 304 stainless steel housings, with 316 stainless steel available as an option. That family is the correct starting point when the cleaning regime is defined by a hygiene standard rather than by general wet conditions.

For buyers placing equipment on the European market, the compliance envelope adds a further requirement: drum motors must satisfy the Low Voltage Directive 2014/35/EU and carry the CE mark, with safety standards such as EN 62841 or IEC 60034-1 often referenced. SEAPARKS holds CE certification alongside UL, ISO 9001, ISO 14001, ISO 45001 and RoHS 2.0.

Where the Light-Duty Range Stops: Three Practical Limits

First limit: belt pull. 3965 N on the DM138A is the ceiling of the light-duty family described here. A conveyor that needs more pull belongs in the medium-duty hygienic range, where the DM216F is published at 5244 N and the TM216F at 4700 N.

Second limit: roller width. Minimum roller widths of 260–390 mm mean a narrow, small-frame conveyor may not accept the roller diameter required to deliver the needed pull. When minimum roller width and required belt pull conflict, the frame — not the motor — is what has to change.

Third limit: power. The light-duty models top out at 1.5 kW. Where a nominally “light” conveyor is long, inclined, or runs frequent start-stop cycles, accumulated belt pull and duty cycle can push the requirement beyond the published band. The honest engineering answer in that case is to move one class up rather than to order a model at the extreme edge of its range. It is also worth remembering that published power and torque are ranges: the delivered numbers depend on the gear ratio selected, so the operating point should be fixed and stated at order stage.

Application Read-Through: Security Screening, Packaging, Belt Scales and Dusty Lines

Airport and railway security screening is the application where light-duty drum motors carry the clearest published requirement profile. The duty cycle is 24/7 continuous operation with frequent start-stop capability; the working conditions are high-precision positioning, stable low-speed operation and anti-interference capability; and the special requirements listed are high-precision speed control, low vibration, anti-electromagnetic interference and flame retardancy. Matched equipment typically includes the X-ray security scanner, baggage trays, metal detectors and conveyor guide rails. The light-duty models associated with this application include the TM80M, TM113A, TM80A, DM113A, DM138A and TM138A. On these lines the selecting constraints are usually speed stability at low values, belt pull and roller width rather than hygiene rating.

Packaging conveyors, belt scale conveyors and general belt conveyors appear in the same applicable-industry group, where the narrow power band of the DM80A or the 630 N belt pull of the TM80M is often sufficient. Food and pharmaceutical lines sit on the other side of the boundary: published operating conditions for that environment are high humidity, frequent cleaning cycles, hygienic requirements and corrosive conditions, with IP69K washdown protection and food-grade 304 stainless steel stated as requirements. Those lines should be specified from the hygienic F-series rather than from the light-duty A/M series.

Dusty environments form a third case. In agricultural product processing, feed production and food handling, published operating conditions include a dusty environment, continuous operation and frequent material handling cycles, with dust protection, reliable operation, high load capacity and low maintenance listed as special requirements. Supporting equipment in those projects typically includes roller conveyors, belt conveyors, automated sorting equipment, weighing machines and packaging machines.

The DM138A sits at the top of the light-duty band: Ø138 mm roller, 27.69–273.58 Nm rated torque and 3965 N maximum belt pull.

Market Trend: Where Light-Duty Drum Motor Demand Is Coming From

Market size estimates set the context rather than the decision. The global drum motor market was valued at approximately USD 2.07 billion to USD 2.13 billion across 2023–2025 by Custom Market Insights, which attributes growth to logistics automation and food processing demand. Published estimates diverge because of scope: 2025 figures from different research firms range from about USD 2.0 billion to about USD 2.8 billion depending on how much ancillary conveyor equipment is included, so any single number should be treated as an order of magnitude rather than a precise figure.

Within that market, AC drum motors remain the dominant revenue segment. Dataintelo places the AC motor segment at 52.3% revenue share in 2025, which is consistent with the structure of the light-duty range described here, where asynchronous AC models account for most of the model count and cover most of the belt pull band.

Regionally, Asia Pacific is the fastest-growing area for drum motors, projected by Dataintelo to hold a 38.2% revenue share by 2025 on the back of industrialisation and e-commerce growth in China and India. For buyers this matters less as a statistic than as a supply-base fact: light-duty drum motors are increasingly sourced from manufacturers whose published specifications — power, torque, belt pull, protection class, minimum roller width — can be compared line by line across suppliers. Published figures for energy-efficient drum motors reach up to 82–83% overall efficiency according to Rulmeca and Interroll material, which is a useful reference point when a drum motor is being weighed against an external geared drive on total cost of ownership.

Light-Duty Drum Motor Procurement FAQ

What motor types are available in the light-duty drum motor range?

Three architectures are published for light-duty conveying: single-phase asynchronous (TM80M, TM113M), asynchronous AC in single-phase and three-phase versions (TM80A, TM113A, TM138A), and synchronous motors in DC or three-phase form (DM80A, DM113A, DM138A). The roller diameters covered are Ø80 mm, Ø113 mm and Ø138 mm, and housings are available in carbon steel or 304 stainless steel.

What power range should a light-duty conveyor drum motor sit in?

Published light-duty rated power spans 0.034 kW to 1.5 kW. The low end covers the TM80M and single-phase TM80A at 0.034–0.11 kW, the middle covers the Ø113 mm models at 0.12–0.55 kW, and the top covers the Ø138 mm A-series at 0.25–1.1 kW (TM138A) and 0.75–1.5 kW (DM138A). Because these are ranges across gear ratios, the operating point — not the range — should be stated on the purchase specification.

How much torque do light-duty drum motors produce?

Published rated torque ranges from 2.36–22.02 Nm on the single-phase TM80A and 2.71–25.9 Nm on the TM80M, through 3.49–21.89 Nm on the DC synchronous DM80A, 10.34–82.99 Nm on the three-phase TM113A and 9.94–115.99 Nm on the DM113A, to 19.46–243.23 Nm on the TM138A and 27.69–273.58 Nm on the DM138A. Within one model, the highest torque in the range is published at the lowest nominal belt speed.

How much belt pull can a light-duty drum motor provide?

Maximum belt pull runs from 534 N on the DM80A and 538 N on the single-phase TM80A, through 630 N (TM80M), 705 N (three-phase TM80A) and 770 N (TM113M), to 1410 N (single-phase TM113A), 1469 N (three-phase TM113A), 2053 N (DM113A), 3525 N (TM138A) and 3965 N (DM138A). Above roughly 3965 N, a project moves into the medium-duty hygienic range, where the DM216F is published at 5244 N and the TM216F at 4700 N.

Should I choose single-phase, DC synchronous or three-phase for a light-duty conveyor?

Single-phase asynchronous models suit locations with only a single-phase supply and modest loads, with maximum belt pull of 630 N (TM80M) and 770 N (TM113M). The DC synchronous DM80A suits compact light-duty conveying with a narrow power band of 0.09–0.12 kW and 534 N maximum belt pull. Three-phase models should be considered when the line needs the highest pull and speed range in the light-duty class: 1469 N on the three-phase TM113A, 2053 N on the DM113A and 3965 N on the DM138A.

What protection class should I specify for a light-duty drum motor?

The light-duty A-series and M-series models are published with protection options of IP66, IP67 or IP69. Where the cleaning regime requires high-pressure, high-temperature washdown, the relevant designation is IP69K, which under IEC 60529 is the highest ingress protection rating, defined for washdown up to 1450 psi at 80 °C; that rating appears on the hygienic F-series, which is published with 304 stainless steel housings and optional 316 stainless steel. Buyers placing equipment on the EU market should also confirm that the unit satisfies the Low Voltage Directive 2014/35/EU and carries the CE mark.

What is the minimum roller width, and does it constrain conveyor design?

Minimum roller widths in the light-duty range run from 260 mm on the TM80M to 390 mm on the DM138A. Ø80 mm models span 260–340 mm, Ø113 mm models 310–370 mm and Ø138 mm models 340–400 mm. Because higher belt pull generally requires a larger roller diameter, minimum roller width and belt pull should be checked together during frame design; if the two conflict, the frame rather than the motor is normally the item that changes.

Which light-duty drum motors are used in airport security screening and baggage handling?

Airport and railway security screening conveyors are listed among the applicable industries for the light-duty range, with the TM80M, TM80A, TM113A, DM113A, DM138A and TM138A associated with those projects. The published duty profile is 24/7 continuous operation with frequent start-stop capability, requiring stable low-speed operation, high-precision speed control, low vibration and anti-electromagnetic interference, with matched equipment including X-ray scanners, baggage trays, metal detectors and guide rails.

Future Outlook

For light-duty conveying, the specification conversation is shifting from “which drum motor fits” to “which drum motor can be verified.” Buyers increasingly compare published torque, belt pull and minimum roller width against their own load assumptions before requesting a quotation, and they expect a datasheet whose numbers reconcile with the physical relationship between torque, roller diameter and pull at the belt.

Two other directions are likely to continue. The first is clarity around protection ratings: as hygiene-driven specifications spread beyond food and pharmaceutical lines, the practical distinction between IP69 and the IP69K washdown designation will become a routine line item in light-duty quotation reviews rather than a specialist question. The second is documentation quality. Because drum motors are bought against specifications rather than by inspection of a finished machine, the manufacturer that publishes complete ranges — power, torque, belt pull, belt speed, minimum roller width, protection class and housing material, model by model — gives procurement teams the ability to reduce technical risk before the order, which is where most light-duty conveyor surprises originate.

The product and corporation overview from SEAPARKS, covering the light-duty A-series and M-series alongside the hygienic F-series, is available as a downloadable brochure: Product & Corporation 20260624 (PDF).