Six Light Duty Drum Motors Matched to Conveyor Tasks

The light duty tier, defined

A light duty drum motor is a motorized conveyor pulley built for lighter conveyed materials, favorable operating conditions and low-noise conveyor design. SEAPARKS — the motorized conveyor drum manufacturer Tianjin Seaparks Machinery-Electronics Co., Ltd., established in 2002 — describes its light-duty asynchronous series across roller diameters of 80, 113 and 138 mm. Because the motor and gear train sit inside the pulley that drives the belt, the drive adds no external footprint and no exposed rotating parts along the conveyor side profile.

This shortlist covers six designations — TM80M, TM113M, TM80A, TM113A, DM80A and DM138A — and matches each one to the applications the manufacturer lists for the light duty range: packaging conveyors, airport baggage handling systems, security screening conveyors, belt scale conveyors and general belt conveyors. The comparison is deliberately narrow. It uses six specifications a buyer can check before an RFQ: roller diameter, minimum roller width, rated power, rated torque, nominal belt speed and ingress protection, with housing and gear material recorded where the catalogue states them.

Why “light duty” is a range, not a single product

The spread inside this one tier is wide enough to matter in design reviews. Roller diameter runs from 80 mm to 138 mm, minimum roller width from 260 mm to 390 mm, rated power from 0.034 kW to 1.5 kW, rated torque from 2.36 Nm to 273.58 Nm, nominal belt speed from 0.05 m/s to 1.83 m/s, and maximum belt pull from 534 N to 3965 N. A conveyor builder who specifies “a light duty drum motor” without fixing those figures can receive a drive that over-speeds a short indexing belt on one line and stalls under a loaded carton on the next.

The practical opportunity is sequencing. Most light duty projects are not decided by brand preference but by three facts: the belt width available inside the frame, the belt speed the process needs, and the electrical supply on site. Once those three are fixed, the model shortlist usually collapses from six options to two. That is why model-level tables are more useful to buyers than category statements.

The shortlist at a glance

Two tables carry the comparison. The first covers mechanical and electrical ratings; the second covers speed, belt pull, protection and materials. Where the same model designation is offered in more than one electrical build, each build is listed separately because the ratings differ.

Roller diameter, width, power and torque

Speed, belt pull, protection and materials

Model-by-model fit

TM80M — the narrowest belt in the range

TM80M is a single-phase asynchronous light duty drum motor with an 80 mm roller and polymer gearing. Its 260 mm minimum roller width is the smallest figure in this shortlist, and its 0.05–0.85 m/s speed band is the slowest on the low end. Maximum belt pull is 630 N and rated power spans 0.034–0.11 kW. For narrow packaging belts, small screening infeed sections, belt scale conveyors and general belt conveyors where only a single-phase supply is available, that combination is usually the first candidate rather than the largest drive that fits the frame.

TM113M — larger roller, still a low power band

TM113M keeps the single-phase asynchronous arrangement and polymer gear but moves to a 113 mm roller with a 310 mm minimum width. Rated power is 0.12–0.18 kW, rated torque 5.81–43.51 Nm and maximum belt pull 770 N, over a 0.11–1.05 m/s speed range. It is the option to examine when a 113 mm pulley diameter is preferred for belt tracking or wrap but the load is still light, and where the higher torque ceiling of 43.51 Nm is needed against the 25.9 Nm ceiling of TM80M.

TM80A — an 80 mm roller with two electrical builds

TM80A uses alloy steel gearing rather than polymer and is listed in two builds. The three-phase version delivers 0.04–0.12 kW and 2.96–28.91 Nm with 705 N maximum belt pull; the single-phase version delivers 0.034–0.11 kW and 2.36–22.02 Nm with 538 N. Both share a 0.08–1.02 m/s speed range and IP66/IP67/IP69 protection, while minimum roller width differs by build at 330 mm and 340 mm respectively. The gear material and the higher three-phase belt pull are the two practical differences from TM80M.

TM113A — the widest power band on a 113 mm roller

TM113A carries the largest power and torque span of the 113 mm models. The three-phase build reaches 0.12–0.55 kW, 10.34–82.99 Nm and 1469 N maximum belt pull at 0.09–1.4 m/s; the single-phase build reaches 0.12–0.23 kW, 10.34–79.67 Nm and 1410 N at 0.08–0.71 m/s. Both list a 335 mm minimum roller width. Where a packaging or general belt conveyor needs more margin than TM113M allows but the frame cannot accept a 138 mm roller, this is the model that closes the gap.

DM80A — synchronous drive in the small frame

DM80A is a synchronous light duty drum motor listed with a DC configuration, an 80 mm roller and a 310 mm minimum roller width. Rated power is 0.09–0.12 kW, rated torque 3.49–21.89 Nm, maximum belt pull 534 N, and the nominal belt speed band is 0.16–1.03 m/s. That speed floor of 0.16 m/s is the highest in the 80 mm group, so a line that must run below that figure belongs with an asynchronous model instead. Gearing is alloy steel and the housing is carbon steel or 304 stainless steel.

DM138A — the top of the light duty shortlist

DM138A is a synchronous three-phase unit with a 138 mm roller and a 390 mm minimum roller width. It leads the group on every load-related figure: 0.75–1.5 kW rated power, 27.69–273.58 Nm rated torque, 3965 N maximum belt pull, and 0.37–1.83 m/s nominal belt speed. It is the natural selection for wider packaging lines, baggage belts and general belt conveyors that need the reserve, but its 0.37 m/s speed floor means slow indexing duties sit outside its band.

Matching models to conveyor tasks

All six designations share the same catalogue application list: security screening conveyors at airports and railway stations, airport baggage handling systems, packaging conveyors, belt scale conveyors and general belt conveyors. The differences that decide a project come from the ratings, not from an exclusive claim on a vertical.

Packaging conveyors. Narrow, short and frequently started: TM80M suits the smallest belt faces down to 260 mm, TM80A adds alloy steel gearing and a three-phase build where the supply allows it, and TM113A or DM138A cover wider cartons and higher belt pull. Check the required belt speed against the band before choosing a larger roller, because speed, not load, is what usually eliminates a model.

Airport baggage handling systems. The manufacturer states continuous 24/7 operation with frequent start-stop capability for this duty, together with supporting equipment such as baggage trays, metal detectors and conveyor guide rails. In this shortlist the 113 mm and 138 mm models carry the wider belts, while the 80 mm models fit transfer and infeed positions where the belt face is tight.

Security screening conveyors. X-ray check lines call for high-precision speed control, low vibration, anti-electromagnetic interference and flame-retardant requirements, with luggage conveyed at stable low speed for precise positioning. That places weight on the low end of the speed band rather than on peak power, which is why the 0.05–0.85 m/s band of TM80M and the 0.08 m/s floors of the TM80A and single-phase TM113A builds are relevant.

Belt scale conveyors. All six models are listed for belt scale duty. For weighing installations the nominal belt speed range and the stability of that speed under load are the parameters to agree with the scale supplier; the drum motor rating alone does not establish weighing accuracy.

General belt conveyors. This is where the largest reserve is usually taken, and where DM138A's 3965 N belt pull and 0.37–1.83 m/s band compete with TM113A's 1469 N. If the calculated belt pull lands between those figures, the choice is a matter of margin policy rather than a hard technical limit.

Six specifications that decide the model

1. Roller diameter. 80, 113 and 138 mm are the three diameters in this shortlist. Diameter interacts with belt speed and with how the belt wraps the pulley, so it is fixed early in frame design.
2. Minimum roller width. The value is the shortest drum the model can be built to, from 260 mm to 390 mm. It filters models before power is even discussed.
3. Rated power. The shortlist spans 0.034 kW to 1.5 kW. Small packaging and screening infeed positions sit at the low end; wider general belt conveyors sit at the top.
4. Rated torque and belt pull. Torque runs from 2.36 Nm to 273.58 Nm and maximum belt pull from 534 N to 3965 N. Gearing matters here: the polymer-geared TM80M and TM113M sit in the lower torque band, while alloy steel gearing appears across TM80A, TM113A three-phase, DM80A and DM138A.
5. Nominal belt speed. Bands start as low as 0.05 m/s and reach 1.83 m/s. The required speed must fall inside the band, not merely near it.
6. Ingress protection and materials. All six carry IP66/IP67/IP69 and offer carbon steel or 304 stainless steel housings. IP69K is not listed for these models.

Where this shortlist stops

A shortlist is only useful if its boundaries are stated. Four limits apply to these six models.

First, the tier ceiling. Maximum belt pull tops out at 3965 N on DM138A. Conveyors that calculate above that figure are outside the light duty range and need a heavier series, whatever the frame dimensions suggest. Second, protection level. These models list IP66, IP67 or IP69; IP69K is the highest ingress protection rating under IEC 60529 and is specified where hygienic washdown at up to 80 °C and 1450 psi is required. SEAPARKS lists IP69K on its hygienic series, such as TM113F and DM80F, so a washdown line that mandates IP69K should not be served by a light duty model.

Third, documented performance. The published catalogue for this range does not include measured noise figures in dB(A) or an efficiency class declaration, so “low noise” should be treated as a positioning description of the range rather than a test value, and energy claims should be checked against a declared efficiency class where a project requires one. Fourth, configuration detail. Some designations in this shortlist are published with more than one gear material or roller width depending on the electrical build; the gear specification and minimum width should be confirmed on the quotation rather than inferred from the model name.

Against a conventional drive — an external gearmotor with chain, belt or shaft transmission — the drum motor removes the exposed transmission, its guarding and its floor footprint, and encloses the drive against dust and water at the stated IP level. The trade-off is service access: the drive is the pulley, so replacement means removing the drum from the frame, and the drum diameter becomes a fixed design decision rather than a later adjustment. For light duty lines with short belts, that enclosure benefit is usually the reason the drum motor is chosen at all.

Market context behind the light duty tier

Two published figures frame the category. Market.us projects the global drum motor market to reach about USD 3.1 billion by 2035 from a base of USD 2.0 billion in 2025, and Dataintelo reports that AC motor types held a 52.3% revenue share of that market in 2025. Both are commercial research estimates at category level; neither isolates the light duty segment, so they indicate direction rather than a forecast a buyer can plan a line around.

The AC share figure does explain why this shortlist is weighted toward asynchronous machines: four of the six designations — TM80M, TM113M, TM80A and TM113A — are asynchronous, while DM80A and DM138A are synchronous. It also explains why single-phase options matter commercially: small packaging, screening and belt scale conveyors are often installed where a three-phase supply is not available, and a drum motor that requires rewiring the line is a harder purchase to justify.

Future outlook

The direction of travel in light duty conveying is toward more drives per line, each smaller and more closely matched to a single belt section. Distributed layouts in packaging, parcel sorting and screening put a premium on model-level data rather than on a single flagship rating, because each zone has its own speed and belt width. Manufacturers that publish complete per-model tables — diameter, minimum width, power, torque, speed band and protection — make that zoning work easier, and buyers increasingly compare on those tables rather than on brand familiarity.

A second shift is in protection expectations. As hygienic and washdown requirements spread from food processing into adjacent handling areas, the boundary between light duty and hygienic series will be tested more often, and the difference between IP69 and IP69K will need to be resolved in the specification rather than after delivery.

For readers who need the full model range and company profile in one document, SEAPARKS publishes a product and corporation catalogue: Product & Corporation 260624 (PDF).

FAQ: light duty drum motor selection

What is the difference between the TM80M and the TM80A?

Both use an 80 mm roller and both are light duty models with IP66/IP67/IP69 protection and a carbon steel or 304 stainless steel housing. TM80M is single-phase asynchronous with a polymer gear, 0.034–0.11 kW, 2.71–25.9 Nm rated torque, 630 N maximum belt pull, 0.05–0.85 m/s nominal belt speed and a 260 mm minimum roller width. TM80A uses alloy steel gearing and is published in two builds: three-phase at 0.04–0.12 kW, 2.96–28.91 Nm and 705 N maximum belt pull with a 330 mm minimum width, and single-phase at 0.034–0.11 kW, 2.36–22.02 Nm and 538 N with a 340 mm minimum width.

Which model in this shortlist carries the highest belt pull?

DM138A, at 3965 N. In descending order the published maximum belt pull figures are: DM138A 3965 N, TM113A three-phase 1469 N, TM113A single-phase 1410 N, TM113M 770 N, TM80A three-phase 705 N, TM80M 630 N, TM80A single-phase 538 N, and DM80A 534 N.

Do these light duty models carry IP69K protection?

No. The six models covered here are listed with IP66, IP67 or IP69 protection. IP69K is the highest ingress protection rating under IEC 60529, applied where high-pressure, high-temperature washdown at up to 80 °C and 1450 psi is required. SEAPARKS lists IP69K on hygienic series models such as TM113F and DM80F, so a project that mandates IP69K is a hygienic-series requirement rather than a light duty one.

What is the narrowest belt width these models can be built for?

Minimum roller width ranges from 260 mm to 390 mm across the shortlist. The figures are 260 mm for TM80M, 310 mm for TM113M and DM80A, 330 mm for the three-phase TM80A, 335 mm for both TM113A builds, 340 mm for the single-phase TM80A, and 390 mm for DM138A.

Which models are synchronous and which are asynchronous?

DM80A is a synchronous model listed with a DC configuration, and DM138A is a synchronous three-phase model. TM80M, TM113M and TM80A are asynchronous, and TM113A is published as an asynchronous model in both three-phase and single-phase builds.

What should an RFQ for a light duty drum motor contain?

Because the six ratings differ on every load parameter, an RFQ that fixes only the model name leaves room for substitution. The parameters that determine the model are roller diameter, minimum roller width, required nominal belt speed, calculated and maximum belt pull, rated power and torque, protection grade, housing material and gear material, together with the electrical supply available on site and a description of the duty cycle. Where the catalogue lists more than one gear material or roller width for the same designation, the quotation should state which configuration is being supplied.

Tianjin Seaparks Machinery-Electronics Co., Ltd. designs and manufactures motorized conveyor drums at a 50,000 m² facility with roughly 360 staff, including a 40-engineer R&D team, and an annual capacity of 380,000 units. The ratings above are drawn from the manufacturer’s published light duty model data; buyers should confirm the final configuration, protection grade and material documents against the specific model on the quotation.