Tubular Motor Manufacturer QC Process

When people evaluate a tubular motor, they usually start with torque, speed, or price.

Those specifications matter, of course. But after years of manufacturing motors for awnings, ZIP screens, rolling shutters, and façade shading systems, we've found that field reliability is often determined by factors that never appear on a product label.

A motor may deliver its rated torque perfectly during factory testing and still develop positioning issues a year later. A gearbox may meet every dimensional specification and still become noisy after several thousand cycles. Even something as simple as the material used in a limit adjustment shaft can influence long-term performance when the motor is exposed to heat, wind loads, and seasonal temperature changes.

This article isn't intended as a product brochure. Instead, we'd like to share a few lessons our engineering team has learned while manufacturing, testing, and troubleshooting tubular motors used in demanding outdoor applications.

One of the most common assumptions in motor manufacturing is that reliability is mainly determined during assembly.Our experience suggests otherwise.Many long-term performance issues can be traced back to raw material consistency.

Several years ago, while reviewing motors returned from a project in Southern Europe, we noticed that thermal protection devices were activating more frequently than expected. The motors were operating within their rated load range, and there were no obvious assembly defects.

The investigation eventually led us back to variations in magnetic core performance.Since then, incoming material inspection has become one of the most important stages of our quality process.

For silicon steel laminations, we monitor core-loss performance under controlled conditions of 50 Hz and 1.5 Tesla. Our internal acceptance standard requires losses below 2.4 W/kg.

On paper, that figure doesn't look particularly dramatic. In practice, however, excessive core losses eventually become heat, and heat has a way of affecting almost everything else inside a motor.
 

If there is one parameter we believe deserves more attention during motor selection, it is thermal management.Most buyers focus on output torque.Most service technicians focus on heat.The reason is simple.A motor can tolerate occasional overload conditions. What it struggles with is prolonged exposure to elevated temperatures.

Outdoor shading systems are particularly challenging because motors often operate inside enclosed aluminum housings exposed to direct sunlight. Internal temperatures can become significantly higher than ambient conditions.To address this, every WJZ 45mm AC tubular motor uses Class H insulated copper windings capable of withstanding temperatures up to 180°C.

Each winding assembly is also equipped with a bimetal thermal protector calibrated to disconnect power at approximately 130°C and automatically reset once temperature falls back to a safe operating range.We didn't introduce this protection because a specification required it.

We introduced it because we repeatedly saw how excessive heat accelerated insulation aging, lubricant degradation, and gearbox wear during long-term testing.

Catalog data is useful, but it rarely reflects real operating conditions.

For example, lifting capacity calculations often assume ideal installation geometry and constant loading. Actual projects rarely behave that way.

Guide rail friction changes over time.

Fabric tension varies.

Wind loads appear without warning.

For that reason, the lifting capacities shown below already include an engineering safety margin intended to account for real-world operating variables.

All models are designed for S2 intermittent-duty operation with a rated running time of four minutes.

In our experience, selecting a motor based solely on calculated torque often leads to undersized systems. Installation variables usually matter more than people expect.

 

One question we are frequently asked is whether a motor really needs extensive endurance testing if it already passes functional inspection.

The short answer is yes.Many mechanical issues simply do not appear during the first few hours of operation.They appear after thousands of cycles.

That's why motors in our validation program are operated through 10,000 complete open-and-close cycles under rated load conditions.

Throughout the process we monitor:

Torque retention

Current consumption

Gear wear

Temperature rise

Limit switch repeatability
 

The purpose isn't just to verify that the motor still runs.What interests us more is how performance changes over time.A gearbox that gradually becomes noisier.A limit system that slowly loses repeatability.A bearing that begins generating abnormal vibration.Those are the kinds of behaviors endurance testing is designed to uncover.

Over the years, one conclusion has remained consistent: reliability is rarely created during final inspection.

It is built step by step through material selection, thermal management, process control, and long-term validation.

Many tubular motors can meet their rated torque on the day they leave the factory. The real difference appears years later, when they continue operating under heat, load, and daily cycling without unexpected failures.In our experience, that is where quality control proves its value.