This article explains how Honest Automation designed and built an automated assembly line capable of handling over 100 high-magnetic multi-pole magnets with high precision and stability.

 

To achieve higher torque density and smoother output performance, modern motor designs are increasingly adopting tens or even hundreds of magnet segments on the rotor or stator.

 

Why are so many magnet segments required?

 

In simple terms, the more magnet segments are used, the more uniform the magnetic field distribution becomes. This directly improves motor control precision and operational smoothness. This design is especially critical in high-end applications such as electric bicycles and robotic joint motors, where strict requirements on size, weight, and performance must all be met.

 

 

In the market, magnets are often “segmented” into smaller pieces and assembled into a complete pole, allowing manufacturers to extract higher performance within limited space.

 

As a result, 100-piece magnet assembly is not an uncommon process in the industry, although it is still relatively specialized.

 

However, the challenge arises in a different scenario:

 

If the magnets are made of standard magnetic materials, the assembly process, while tedious, can still be handled using conventional manual or semi-automated methods.

 

But once high-magnetic materials such as neodymium magnets are used—especially those that are pre-magnetized—the situation changes significantly.

 

In high-magnetic magnet assembly processes, the industry typically faces three major pain points:

 

1. Safety Risks

 

When two high-magnetic magnets come close to each other, they generate extremely strong instantaneous attraction forces. If fingers or hands are caught in the gap, it may cause anything from bruising to serious injuries such as fractures.

 

2. Magnet Fragility

 

High-magnetic magnets are typically brittle. The impact during attraction or even minor collisions in the assembly process can easily cause chipping, cracking, or complete failure of the magnet.

 

3. “Interaction Conflict” with Equipment

 

Traditional automation equipment often uses ferromagnetic materials such as steel and iron in its structural components. When high-magnetic magnets approach these materials, they may either be forcefully attracted in an uncontrolled manner or experience unpredictable displacement, leading to positioning failure and loss of assembly accuracy.

 

Therefore, the automated assembly of 100-piece high-magnetic magnets is not simply a matter of “adding more pieces,” but rather a system-level engineering challenge.

 

So how do we handle the assembly of over one hundred high-magnetic magnets?

 

Traditional automation equipment is typically designed based on one fundamental assumption: the material is passive and force-free.

 

However, high-magnetic magnets behave oppositely—they are “energy-active” materials that generate strong attractive or repulsive forces on their own.

 

If conventional ferromagnetic structures such as steel or iron are still used for constraint, it essentially means fighting directly against the physical nature of magnetic fields.

 

So we adopted a completely different approach: instead of trying to control magnetic force with structure, we made the equipment “non-magnetic.”

 

Specifically, the entire production line was designed as a fully non-magnetized system. Any area where magnets may contact or pass through is constructed using non-magnetic materials, such as non-magnetic stainless steel, aluminum alloy, and specialized non-magnetic steel.

 

This ensures that the equipment itself does not generate any uncontrolled magnetic interaction with the magnets.

 

In addition, we developed targeted process solutions for the three key pain points:

 

※ Safety protection: Non-magnetic materials reduce the influence range of magnetic attraction, while workstation layout is optimized to keep operators at a safe distance from the magnets.

 

※ Anti-fracture control: The speed and trajectory of magnet transfer are precisely controlled to prevent impact and collision.

 

※ Anti-interference design: All ferromagnetic structures are eliminated so that only magnet-to-magnet interaction remains. The equipment functions purely as a guiding system rather than a resisting force. Meanwhile, the material channels and tooling geometry are optimized to ensure magnets move only along predefined paths.

 

Individually, these solutions are relatively straightforward. However, integrating them into a stable and high-efficiency production line is the real engineering challenge.

 

But the problem does not end here.

Due to customer design requirements, the 100+ magnets are not uniform in orientation or shape. In fact, they are configured with multiple different magnetic pole directions.

 

Why does this happen?

 

In modern high-performance motor design, different magnetic pole arrangements are used to optimize magnetic field distribution and further improve motor performance. This is common in advanced motor applications.

 

However, from an automation perspective, this introduces a critical challenge: magnets cannot simply be inserted in a linear sequence.

 

If the assembly order is incorrect, two magnets will repel each other and physically jump apart, making insertion impossible. If the polarity direction is wrong, even if the assembly is completed, the overall magnetic field distribution will be disrupted.

 

So how do we handle multi-pole and multi-orientation magnet assembly?

 

First, we address the “magnetic pole identification” problem. Since magnets with different pole orientations have identical external shapes, they cannot be distinguished by the human eye or standard sensors. Therefore, color coding is applied at the supplier stage, where different colors represent different pole directions. The machine then uses a vision recognition system to identify the color and ensure each magnet enters the correct material channel.

 

Second, we solve the “sequenced insertion without magnetic conflict” problem. We developed a pre-sorting method based on a transfer mold. Magnets with different pole orientations are first inserted into a transfer fixture according to a predefined sequence, where they are organized and aligned in a controlled “safe environment.” They are then transferred as a complete set into the rotor assembly. This process effectively eliminates direct magnetic interference between individual magnets.

 

Finally, we addressed the challenge of preventing magnets from “bursting apart” during transfer.

 

After all transfer molds are assembled, the full set of magnets is pushed into the rotor using a transfer mechanism. However, during this process, due to the extremely strong magnetic forces between magnets, once they leave the constraints of the transfer mold, they may either clump together uncontrollably or repel each other violently.

 

To solve this, we designed a dedicated clamping fixture beneath the rotor. This fixture provides secondary stabilization at the moment when the magnets lose their mold constraints, preventing sudden “bursting” or uncontrolled movement.

 

The entire process is fully automated: which types of magnets are inserted first, which come next, the spacing between slots, and the polarity orientation—all are precisely controlled by the program without any manual intervention.

 

Ultimately, this enables the one-time forming assembly of over 100 high-magnetic, multi-pole magnets with stable, collision-free, and highly accurate positioning.

 

At this point, it can be said that this 100-piece high-magnetic multi-pole magnet automated assembly line was not only the first project we developed, but also one of the earliest implementations of such a solution in the automation industry.

 

The customer requirements were clearly defined, but there was no absolute guarantee at the beginning that the project could be successfully realized. Internally, we had concerns: magnets might burst during transfer, sequencing errors could lead to full-ring scrap, cycle time might not be achievable, and safety risks were significant—since uncontrolled high-magnetic materials pose serious hazards.

 

As a provider of intelligent motor manufacturing solutions, we fully understand that the motor industry is evolving rapidly. With the emergence of new product forms, increasingly customized requirements are appearing, especially in emerging sectors such as humanoid robotics, eVTOL (flying vehicles), and high-end micro-mobility, where performance, size, and weight constraints are becoming unprecedentedly strict.

 

This means that traditional standardized automation equipment will increasingly struggle to meet future demands. The true value of equipment providers is shifting from standardized delivery to the capability of solving complex, non-standard engineering challenges.

 

This understanding changed our mindset when facing this “first-of-its-kind” project. The question was no longer “Can it be done?”, but rather “How should it be done?”

 

Our R&D team invested extensive time in simulation, experimental validation, and iterative optimization of tooling and processes. Starting from single-station testing, we gradually scaled up to the full system integration, ultimately achieving a stable and fully functional production line.

 

What was the result?

 

It worked. The fully automated production line achieved stable operation, successfully completing the insertion, transfer, and press-fitting of over 100 high-magnetic magnets with multiple pole orientations into the rotor.

 

The cycle time met the design target, and the yield rate satisfied customer requirements.

 

 

So, returning to the original question: how did we develop the first 100-piece high-magnetic magnet assembly line?

 

In essence, the answer is not complicated: understand the physical laws, respect material properties, and apply the most appropriate engineering approach to solve the most challenging problems.

 

What truly convinced our customer was not a single technical route, but our consistent ability to face highly complex requirements without avoidance, and our capability to repeatedly turn difficult engineering challenges into stable, manufacturable solutions.

 

If your product also involves similar automation challenges—whether magnets, coils, stators, or rotors—and you feel “this is too difficult to automate,” we are open to discussion.

 

Honest Automation specializes in solving complex motor manufacturing automation challenges and provides customized engineering solutions for demanding applications.