During operation, many automatic door systems encounter issues such as weak movement, vibration, jerking, unusual noise, or rapid motor deterioration after a period of use. In reality, the cause is not only related to equipment quality but is also directly associated with selecting the wrong automatic door motor power from the beginning. For projects with high traffic frequency such as hospitals, shopping malls, or hotels, accurately calculating door weight, operating frequency, and motor technical specifications is extremely important to ensure stable and durable door operation over the long term. So, how is automatic door motor power calculated, and which specifications should be carefully considered when selecting a motor? Let Sonha Auto explore the details in the article below.
Why is automatic door motor power important?
In an automatic door system, the motor or door operator is the component responsible for carrying the load and maintaining the movement of the entire door leaf. Therefore, automatic door motor power directly affects the operational stability and lifespan of the entire system.
If the selected motor is too small compared to the actual door load, the motor will constantly operate under overload conditions. As a result, the door may experience slow opening and closing, vibration, overheating, or controller board errors after a short period of operation. In addition to affecting motor durability, excessive load also increases pressure on the sliding rail, rollers, and the entire mechanical operating system.
On the contrary, many projects tend to choose oversized motors with the assumption that “higher capacity means better durability.” However, selecting an excessively large automatic door motor not only increases investment costs but also wastes power and makes operation optimization more difficult for smaller door systems. In practice, a stable automatic door system does not depend on using the most powerful motor, but on the synchronization between the motor, door load, controller, sliding rail, and actual operating conditions of the project.
How is automatic door motor power calculated?
Many people assume that motor selection can be based solely on door dimensions. However, in actual engineering practice, selecting an automatic door motor must be calculated based on multiple factors.
Automatic door weight
This is the most important factor when selecting a motor. Door weight includes not only the glass panels but also aluminum frames, stainless steel frames, accessories, and transmission mechanisms. For large door systems or doors using thick glass, the actual load is often significantly higher than common estimates.
Door opening and closing frequency
A small office door system may only operate a few hundred times per day, while doors at airports, hospitals, or shopping malls may operate continuously almost nonstop. The higher the usage frequency, the greater the requirement for motor durability and stable load performance.
Actual operating environment
Projects exposed to strong winds, high humidity, or dust typically require motors with more stable operating capability and better synchronization with sensor systems to minimize signal errors during operation.
Type of automatic door
Each door type has different load requirements, such as:
- Automatic sliding doors
- Telescopic doors
- Automatic curved doors
- Hermetic hospital doors
This is why selecting an automatic door motor always requires separate calculations for each project model rather than applying a fixed configuration.
Common automatic door motor power chart today
| Motor power | Door load capacity | Common applications |
| 75W – 100W | 60 – 100kg/door leaf | Small offices, showrooms |
| 100W – 150W | 100 – 150kg/door leaf | Shops, hotels |
| 150W – 200W | 150 – 200kg/door leaf | Hospitals, shopping malls, airports |
| Above 200W | Over 200kg/door leaf | Heavy-duty automatic door systems |
However, the automatic door motor power chart above is only a basic reference. In many cases, two door systems with the same load capacity but different traffic volumes still require completely different motor configurations.
For example, a 120kg door system at a small showroom has very different requirements compared to a 120kg door at a shopping mall operating continuously all day. Therefore, motor selection cannot rely solely on load capacity but must also evaluate the overall actual operating conditions.
Important automatic door motor specifications technicians should pay attention to
Besides power output, technicians must clearly understand important automatic door motor specifications to avoid unstable door operation after installation.
Torque
Torque determines the motor’s ability to pull the load and maintain stable movement when the door starts opening or closing. Motors with low torque are more likely to lose pulling force during continuous operation or when encountering high resistance, especially in projects with large doors and heavy traffic flow.
Duty cycle – Continuous operating capability
This is a very important specification but is often overlooked. Duty cycle reflects the motor’s ability to operate continuously for long periods while maintaining stable performance. If a residential-grade motor is used in high-traffic projects such as hospitals or shopping malls, the motor will quickly overheat and its lifespan will decrease even when the load has not exceeded the limit.
Opening and closing speed and damping capability
A faster door is not always better. For hotels, premium offices, or hospitals, opening and closing speed must be optimized to ensure smooth operation, reduce impact, and improve user experience. A high-quality motor typically offers better acceleration and deceleration control, helping the door move smoothly and reducing vibration during operation.
Synchronization capability between controller and sensors
Even if the motor itself is high quality, slow controller response or unsynchronized sensors can still cause unstable operation. This is why modern automatic door systems focus not only on motor power but also on signal communication and synchronized operation between the motor, sensors, and control board.
Common mistakes when selecting automatic door motors
One of the most common mistakes when selecting automatic door motor power is focusing only on motor price while ignoring the actual door load and project operating conditions.
Many door systems use low-cost motors but soon develop issues such as vibration, overheating, or reduced operating speed after a short period of use. In addition, incorrect automatic door load calculations also cause many systems to deteriorate quickly because the motor constantly operates under overload conditions.
Furthermore, many high-traffic projects still use residential-grade motors instead of specialized motors designed for heavy-duty automatic door systems, significantly reducing equipment lifespan.
Why are NABCO automatic door motors highly rated?
In the automatic door industry, NABCO is highly regarded not only for its motors but also for its overall synchronized operating system design philosophy. Instead of focusing solely on increasing pulling power, NABCO Japanese automatic door motors are designed to maintain stable load performance and optimize long-term operation. The motor system is synchronized with the controller, sliding rail, rollers, and sensors to reduce vibration, minimize mechanical wear, and maintain stable movement even in environments with extremely high operating frequency.
One of NABCO’s major advantages is the application of CAN technology in the NET-DS controller system. This technology allows the motor, sensors, and controller to continuously exchange real-time data through the same communication system. As a result, the door can respond more accurately to actual movement, reduce the risk of signal errors, and maintain stable synchronization throughout operation.
This is also why many NABCO door systems at airports, hospitals, and shopping malls continue to maintain stable operation even after long periods of continuous use.
>>> See more: How long does an automatic door motor last? How to extend its lifespan and when to replace it
Conclusion
Selecting the correct automatic door motor power not only affects opening and closing performance but also directly determines the stability, durability, and lifespan of the entire door system during long-term operation. For high-traffic projects such as hospitals, shopping malls, or hotels, the motor must be calculated and synchronized according to door load, operating frequency, and actual usage conditions to minimize vibration, overload, and future operational issues.
With more than 20 years of experience implementing automatic door systems in major projects, Sonha Auto possesses a technical team trained by Japanese experts, directly surveying and consulting the most suitable motor configuration for each door system to ensure stable operation, long-term durability, and optimized operating costs.
Contact Sonha Auto for consultation on selecting the most suitable automatic door motor for your actual project model!
