A 24mm Tubular Motor does not have one universal load capacity. The actual lifting capability depends on the motor’s torque, gearbox, roller-tube radius, blind dimensions, fabric weight, friction, installation alignment, operating speed, and duty cycle. In other words, the 24mm measurement identifies the motor’s approximate diameter and installation class, not the maximum weight it can lift.
For small roller blinds, cellular shades, Roman shades, skylight blinds, and other compact window-covering systems, a 24mm motor may be suitable when the calculated torque requirement remains within the manufacturer’s rated operating range. I use the motor’s torque rating and the roller-tube radius as the starting point, then apply a safety margin before approving the design.
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A 24mm tubular motor is a compact cylindrical motor designed to fit inside a small roller tube. The motor rotates the tube, allowing a blind, shade, screen, or similar roll-up product to move vertically. The motor diameter determines installation compatibility, but it does not independently define thrust, payload, lifting force, or torque.
Yozewit identifies its YZM24 Motor Series as a compact product family for applications such as skylight blinds, day-and-night honeycomb blinds, and other indoor shading systems. The listed YZM24 models include single-output and dual-output configurations, which indicates that the product family contains multiple designs rather than one motor with one fixed capacity.
The correct interpretation is:
A 24mm motor should therefore be selected from its complete technical specification, not from the diameter alone.
Without a model-specific torque rating, it is not technically accurate to assign one fixed kilogram value to every 24mm tubular motor. A low-speed motor with a higher gear ratio may produce more torque than a faster motor of the same diameter, while a battery-powered model may use a different operating profile from a wired motor.
The most useful calculation is:
[ F = \frac{T \times \eta}{r} ]
Where:
To estimate the movable mass:
[ m = \frac{T \times \eta}{r \times g \times SF} ]
Here, m is the recommended working mass in kilograms, g is gravitational acceleration at approximately 9.81 m/s², and SF is the safety factor.
For example, assume a motor produces 2 N·m of rated torque, the effective tube radius is 0.02 m, mechanical efficiency is 0.85, and the selected safety factor is 1.5:
[ m = \frac{2 \times 0.85}{0.02 \times 9.81 \times 1.5} ]
The resulting recommended working load is approximately 5.8 kg. This is an engineering example, not a published Yozewit capacity for every YZM24 motor. The final rating must come from the exact model’s data sheet and application test.
Torque is the central specification when I assess a 24mm tubular motor for roller blinds. The motor turns the tube, and the tube converts that rotational force into linear lifting force at its outer surface. A larger tube radius increases the distance from the center, but it also requires more torque to lift the same weight.
The relationship can be simplified as:
[ T = F \times r ]
If a blind requires 60 N of lifting force and the effective tube radius is 0.025 m, the required torque before losses is:
[ T = 60 \times 0.025 = 1.5 \text{ N·m} ]
After including friction, gearbox losses, fabric contact, and a safety margin, the selected motor would need a higher rated torque than 1.5 N·m.
This is why two blinds with the same weight can require different motors. A blind with a larger roller tube, greater side friction, or an uneven bracket alignment may need more torque than a lighter, correctly aligned blind using a smaller tube.
Motor specifications may use different units, so I convert them before comparing products.
| Unit | Meaning | Approximate conversion |
|---|---|---|
| Newton (N) | Force | 1 kgf ≈ 9.81 N |
| Kilogram-force (kgf) | Force equivalent to one kilogram under standard gravity | 1 kgf ≈ 9.81 N |
| Pound-force (lbf) | Imperial force unit | 1 lbf ≈ 4.45 N |
| Newton-metre (N·m) | Rotational torque | Torque, not direct payload |
| Kilogram-metre (kgf·m) | Torque expressed using kilogram-force | 1 kgf·m ≈ 9.81 N·m |
A torque rating cannot be treated as a payload rating until the roller-tube radius is known. For this reason, a specification such as “2 N·m” does not directly mean “2 kilograms.” The tube geometry must be included in the calculation.
When I size a motor, I calculate the complete moving load rather than weighing only the fabric. The total system may include the fabric, bottom rail, slats, decorative components, attached cords, intermediate profiles, and any material that rotates with the tube.
Use this sequence:
Measure the finished blind width and drop.
Record the actual dimensions rather than the window opening alone. A larger area usually means more fabric and greater roll diameter.
Determine the fabric or shade mass.
Use the manufacturer’s weight per square metre and multiply it by the blind area. For example, a 2.0 m wide by 2.0 m high blind has an area of 4.0 m².
Add the bottom rail and hardware.
If fabric weighs 0.45 kg/m², the fabric mass is 1.8 kg. Adding a 0.7 kg bottom rail and 0.3 kg of attached components gives a total static mass of 2.8 kg.
Estimate friction and alignment losses.
Clean bearings and parallel brackets reduce resistance, while a bent tube or tight side channel can increase the required torque.
Calculate the effective radius.
The radius changes as fabric winds onto the tube. Use the largest working radius for a conservative calculation.
Apply a safety factor.
For a light indoor blind with stable movement, a design factor of 1.3 to 1.5 may be considered during preliminary sizing. Heavier, wider, outdoor, or frequently operated systems may require a larger margin specified by the engineer or manufacturer.
For the example above, a 2.8 kg blind should not be matched to a motor rated for exactly 2.8 kg. The motor must also overcome tube torque, friction, acceleration, and repeated operating cycles.
A manufacturer’s maximum load may be measured under a specific combination of tube size, mounting orientation, temperature, voltage, speed, and duty cycle. It may describe a short-duration peak condition rather than the load recommended for daily operation.
I separate motor capacity into four categories:
A motor that can move a blind once in a workshop may not be appropriate for a commercial building operating the same blind dozens of times per day. Repeated cycles increase thermal stress, battery consumption, gearbox wear, and the risk of limit-control problems.
For this reason, I recommend using the manufacturer’s rated working torque rather than the absolute stall torque. Stall torque describes what the motor may produce when movement stops, but operating continuously near that value can increase heat and reduce service life.
A 24mm tubular motor is generally intended for compact roller blinds and small shading products where the roller tube and available installation space are limited. Yozewit positions its 24mm series for compact applications such as small blinds, skylight blinds, and honeycomb shade systems.
It may be a suitable choice when:
A 24mm motor may not be appropriate for heavy roller shutters, large outdoor awnings, wide projection screens, or large blinds with substantial bottom rails. Those applications may require a 35mm, 45mm, or larger motor with higher torque and a stronger tube assembly.
The main difference between a 24mm and 35mm tubular motor is not simply physical size. A 35mm motor generally provides more installation space for a larger motor, gearbox, braking system, battery, or control assembly. It is commonly associated with medium-sized blinds, projection screens, and heavier shading systems.
| Factor | 24mm tubular motor | 35mm tubular motor |
|---|---|---|
| Installation space | Narrow roller tubes and compact systems | Larger roller tubes and deeper assemblies |
| Typical application | Small blinds, honeycomb shades, skylight blinds | Medium roller blinds, screens, heavier shades |
| Torque selection | Usually limited by compact design | Broader potential torque range |
| Visual impact | Smaller tube and compact end fittings | Larger tube and stronger hardware |
| Weight suitability | Light to moderate systems, model dependent | Moderate to heavier systems, model dependent |
| Design priority | Space efficiency and low visual profile | Greater torque reserve and system capacity |
The correct choice still depends on the exact motor model. A compact 24mm motor with a suitable torque rating can outperform an unsuitable 35mm motor, while a large blind may exceed the practical limits of even a high-output 24mm design.
I use the following specification checklist before approving a motor:
| Selection item | Required information |
|---|---|
| Motor category | Roller blind, skylight blind, honeycomb, Roman shade, or another system |
| Motor diameter | Confirm 24mm body and adapter compatibility |
| Rated torque | Record N·m or another stated torque unit |
| Speed | Match movement speed to blind type and user expectations |
| Tube size | Confirm internal diameter, outer diameter, and profile |
| Blind mass | Include fabric, rail, hardware, and attached components |
| Duty cycle | Check cycles per hour or operating-time limits |
| Power source | Wired DC, battery, or another specified supply |
| Limit control | Mechanical, electronic, preset, or smart limit system |
| Control method | Switch, remote, sensor, or smart-home controller |
| Safety margin | Separate normal working load from peak capacity |
Yozewit offers several tubular motor diameter families, including 24mm, 25mm, 27mm, 35mm, and 47mm products. Its product information emphasizes selecting diameter, torque, speed, power supply, control method, tube compatibility, and load together rather than using diameter as the only selection criterion.
Yozewit’s YZM24 Motor Series includes models identified for skylight blinds, day-and-night honeycomb blinds, and single-output or dual-output configurations. However, the public product listing does not provide one universal torque or payload value for the entire YZM24 family.
That distinction matters because a product series can contain multiple motors with different control functions, output arrangements, speeds, and intended applications. I would request the exact model number, rated torque, maximum tube size, duty cycle, and tested working load before using a YZM24 motor in a production blind.
Yozewit describes itself as Guangdong Yozewit Intelligent Technology Co., Ltd., based in Dongguan, Guangdong, China. The company states that it provides tubular motors, curtain motors, controllers, sensors, and OEM/ODM services, with a 5,000 m² production base, annual capacity above 1,000,000 pieces, and more than 350 partners. These figures describe the company’s manufacturing profile, but they do not replace model-specific capacity testing.
I do not design a blind around the motor’s maximum lift-off value. Instead, I calculate the expected working load, add mechanical losses, and compare the result with the motor’s rated operating torque.
A practical review should include:
If the calculated requirement is close to the motor’s published limit, I would select a higher torque model or a larger motor category rather than relying on a borderline result. The goal is to keep the motor within its normal operating range, not merely to make the blind move once.
What Load Capacity Can a 24mm Tubular Motor Handle? The answer depends on torque, roller-tube radius, blind weight, friction, speed, gearing, duty cycle, and safety margin—not on the 24mm diameter alone. For compact roller blinds, skylight blinds, and honeycomb shades, a 24mm motor can be suitable when the complete system remains within the exact model’s rated working capacity.
To confirm suitability, calculate the total blind mass, convert the motor specification into torque or lifting force, use the largest effective tube radius, and apply a design safety factor. Then compare the result with the manufacturer’s rated operating torque, maximum tube size, duty-cycle limit, and tested application data.
For a Yozewit YZM24 Motor Series selection, I would provide the blind width, drop, fabric weight per square metre, bottom-rail mass, tube dimensions, power supply, control requirements, and expected daily cycles. That information allows the manufacturer to recommend a specific motor rather than treating every 24mm tubular motor as having the same load capacity.
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