Short answer: An automatic window shutter motor is selected as a tubular motor with sufficient torque for the window width and height, the slat type and the total weight of the shutter. The control layer is then determined according to usage habits: remote control or wall switch, timer, sun-wind-rain sensors and smart home integration. The right match ensures quiet operation and long motor life.
Two decisions determine user satisfaction with an automatic window shutter: the motor must be mechanically suited to the shutter, and the control scenario must fit real-life habits. If the first is wrong, the motor strains, slows down and fails early. If the second is wrong, an expensive automation system turns into a shutter that is only ever used with the remote control. In this article we look at the logic of motor selection for aluminium window shutter systems and the control scenarios that work in practice.
What is the difference between a motorised shutter and an automatic shutter?
These two concepts are often confused. A motorised shutter (PM Drive) is a shutter operated by a tubular motor from a remote control or wall switch; the user initiates every movement. An automatic shutter (PM Auto) is a motorised system with sun, wind and rain sensors, a timer and smart home integration added. In other words, an automatic shutter is not an installation type but a level of control.
The practical consequence of this distinction is that a user who installs a motorised shutter today can later move to automatic operation by adding sensors and a smart module to the same motor. That is why choosing a motor and control infrastructure suitable for expansion at the initial installation prevents costly changes later.
How is window shutter motor power determined?
The tubular motor used in a window shutter sits inside the barrel in the box and winds the slats by turning the barrel. The load the motor has to carry is the total weight of the shutter. The main factors determining this weight are:
Window size
As width and height increase, the slat area, and therefore the weight, increases. For wide openings, 55 mm slats and a more powerful motor are preferred. An increase in height enlarges the diameter of the slats rolled into the box, so the motor carries more load in the final turns.
Slat type
Pack Door window shutters are available with 37, 39, 45 and 55 mm polyurethane-filled aluminium slat options. As slat width increases, unit weight and roll diameter change; motor selection must be made together with the slat type.
Intensity of use
A bedroom shutter used a few times a day and a living room shutter that moves frequently throughout the day in response to a sun sensor do not carry the same load. In sensor and timer scenarios, the motor's number of daily operations increases; this must be taken into account when selecting it.
A motor with lower torque than required struggles to lift the shutter, overheats and soon trips its thermal protection and stops. An overpowered motor, on the other hand, increases the initial investment unnecessarily. The correct torque value is calculated during the site survey according to the dimensions and slat type.
In homes with many windows, it is also important to make a separate calculation for each window. A kitchen window and a wide living room door standing side by side on the same façade will not work efficiently with the same motor. Trying to solve the whole project with a single motor type leads either to unnecessary cost on small windows or to inadequate performance on large openings.
Which control scenarios are useful in everyday life?
Control options should be considered as scenarios rather than in isolation. The table below summarises the most requested usage scenarios in the field and the components they require.
| Scenario | Required component | Benefit |
|---|---|---|
| Closing all shutters with a single button | Wall switch or multi-channel remote control | Saves time when leaving home |
| Opening at a set time in the morning | Timer | Waking with natural light, a regular routine |
| Closing when the sun is high | Sun sensor | Limits overheating of the interior in summer |
| Protection in strong wind | Wind sensor | Reduces the risk of slat and rail damage |
| Automatic movement in rain | Rain sensor | Protects open windows from rainfall |
| Control while away from home | Smart home integration and app | A "someone's at home" scenario while on holiday |
When setting up scenarios, the purpose of each room should be considered separately. While a morning opening scenario provides comfort in the bedroom, closing linked to a sun sensor makes more sense in a south-facing living room in summer. In offices and commercial buildings, central control and solar management with motorised shutters come to the fore.
What should be planned before installation?
With motorised and automatic shutters, there are issues that need to be clarified before installation day. The list below can be used to prepare for the site survey:
- Determine the width and height of each window and the installation type (surface-mounted, concealed, monoblock).
- Plan the nearest power point for each window and how the cable will be routed to it.
- Decide whether a remote control, a wall switch or both will be used.
- List the timer and sensor requirements room by room.
- If a smart home system exists or is planned, share compatibility information with the survey team.
- Consider which position the shutter should stay in during a power cut.
In motorised systems, having the electrical supply ready in advance shortens installation time. In new buildings, leaving cable infrastructure in place at the shell construction stage makes a later move to automation easier.
Field note: When converting a manual shutter to motorised operation, a situation we often see in the field is that rails worn over the years and slats crushed in places strain the motor. Before fitting the motor, we check how smoothly the shutter moves by hand; a shutter that jams by hand will also jam with a motor. That is why the condition of the rails and slats must be assessed before conversion.
Common mistakes
- Choosing the motor on price alone: A motor unsuited to the shutter weight frequently trips its thermal protection and stops.
- Positioning sensors incorrectly: A sun sensor in the shade or a wind sensor that does not catch the wind renders the scenario useless.
- Linking all shutters to a single scenario: Rooms on different façades receive different amounts of sun; a room-based set-up is more efficient.
- Leaving cable infrastructure until later: Running cables afterwards requires additional work on the façade or interior.
- Neglecting remote control security: Steps such as deleting a lost remote from the system should not be forgotten; we cover this in our article on practical tips for window shutter security.
Frequently asked questions
Can a manual window shutter be converted to motorised operation?
Yes. The conversion can be made by fitting a suitable tubular motor to the barrel of the existing manual shutter; in most cases the box does not need to be replaced. The work takes approximately 1–2 hours per window.
Can sensors be added to a motorised shutter later?
Yes. A motorised shutter can be upgraded to automatic operation by adding sensors and a smart module. Compatibility is checked during the site survey according to the existing motor and control unit.
Can automatic window shutters be managed from a phone?
With smart home integration, shutters can be controlled via an app, and timers and scenarios can be defined. The remote control and wall switch can still be used.
How does motor selection affect the price of a window shutter?
Motorised and sensor-equipped systems cost more than manual shutters. The price is determined by window size, slat type, installation method and motor and sensor options together; a project-based quote is prepared after a site survey or photos.
Conclusion and next step
Success with an automatic window shutter comes from combining a tubular motor suited to the shutter's weight with a control scenario designed around real usage habits. Plan the mechanical match first, then the scenario. To determine the right motor and control set-up for your shutters on site, request a free site survey. If you would like to learn about the general structure of window shutter systems, you can start with our article what are window shutter systems.
