Why the Motor Is the Hard Part of a Shutter Job
Measuring a shutter is quick. Sizing the motor correctly is not, because the torque requirement scales with shutter area, tube diameter and fabric weight, and an undersized motor shows up as a slow-running curtain that strains at the bottom of travel. Installers who get this wrong return to the site; installers who get it right do not.
That is the argument for buying the motor from a supplier who will size it with you rather than sell you the catalogue default.
Motor Sizing: The Three Numbers We Need
| Input | Typical range | Why it matters |
|---|---|---|
| Shutter width & height | Overall curtain area | Sets the baseline load |
| Tube diameter | Usually 42mm, 60mm or 70mm | Larger drum reduces required torque at the curtain |
| Fabric weight | kg/m², including any insulation | Laminated and blackout fabric adds mass the area figure misses |
| Cycles per day | Domestic: 2-6; shopfront: 10-30 | Sets the duty cycle the gearbox is rated for |
What You Get in the Kit
| Component | Options | Note |
|---|---|---|
| Tubular motor | 10Nm to 60Nm, 433MHz or 868MHz radio | Sized to the shutter, not to a default |
| End limits | Mechanical switch, or encoder-assisted | Encoder preferred where torque varies with fabric |
| Remote control | 1 / 3 / 5 / 16-channel, LCD or keyfob | Channel count should match the installation |
| Wall transmitter | Optional, where the site has no handheld | Common in hotel and commercial projects |
| Key switch | Optional, for manual override | Needed where local fire or access rules require it |
Where Installers Get Burned
- Buying on shutter area alone. A wide shutter with a thin tube has a lower torque requirement than a narrow shutter with a heavy tube, because the drum diameter changes the mechanical advantage.
- Ignoring the fabric. Laminated insulation and blackout fabric add weight that the area calculation does not capture.
- Specifying a motor without end limits. A motor that cannot be mechanically limited is a motor that will eventually be over-adjusted and fail the drum.
- Forgetting the control. A motor shipped without the matching remote, wall transmitter and end-switch kit is not a complete part.
Request a Quotation — Dooya Tubular Motors
Send the shutter width and height, tube diameter and the brand or model you need to replace. We reply with the exact motor size, EXW price, MOQ and lead time. MOQ 100 pcs per SKU.
Send Inquiry on WhatsAppEmail: Joanna@rfmando.com · MOQ 100 pcs per SKU · 1 free sample per SKU ($30 DHL, buyer pays) · Lead time 7-15 days · T/T 30/70 · EXW Xiamen
What to Verify Before Ordering
- A written motor recommendation with the three input numbers stated, not a guess.
- End-limit and encoder options included, or quoted as separate SKUs — know which.
- The control package is in the order, not deferred to a second shipment.
- Batch date codes and a carton-level packing list, so a mixed order arrives correctly sorted.
Catalogue references for the specification above: RF Mando 433 MHz tubular motor controller for roller shutters and RF Mando Dooya 16-channel RF 433 MHz curtain remote. Both are MOQ-based, ship on our own PCBA and housing tooling, and one free sample per SKU is available before you commit to a production order.
Where to Order
- Somfy RTS Compatible Remotes — 5-channel and 16-channel LCD handsets
- Dooya Compatible Remotes — tubular motor controls and wall transmitters
- RF Remote Controls — full catalogue
Terms
MOQ 100 pcs per SKU. One free sample per SKU ($30 DHL, buyer pays). Lead time 7-15 days. Payment T/T 30/70. Prices EXW Xiamen. 100% functional test on every unit; a third-party QC report at AQL 5% is available on request.