different bonding technologies for motor laminations

Different Bonding Technologies For Motor Laminations

Motor laminations are a critical component of electric motors, responsible for converting electrical energy into mechanical energy. They play a vital role in the overall efficiency and performance of the motor. However, achieving high-quality motor iron cores requires effective motor lamination bonding technologies.

In this blog post, we will explore different bonding technologies used in the industry, their advantages, limitations, and how they contribute to the overall quality of motor laminations.

Motor Lamination Bonding Technologies

Self-Adhesive Laminations Technology:

lamination stacks bonding and stacking

Self-adhesive electric motor lamination technology is a cutting-edge advancement in the field of motor stator and rotor lamination manufacturing. Unlike traditional bonding methods that require additional adhesive materials and complex curing processes, self-adhesive technology involves electrical steel laminations that come with a pre insulate coating adhesive layer. 

This adhesive layer eliminates the need for additional bonding agents, making the assembly process more streamlined and efficient.

This self-bonding technology is particularly beneficial for high-speed motor core production, as it reduces cycle times and increases throughput.

Additionally, full-face bonding of the lamination stacks offers improved temperature resistance and durability compared to traditional bonded laminations. This makes them an ideal choice for applications where reliability and performance are critical, such as in the automotive(EV motor, HEV motor), aerospace(drone motor), and industrial motor sectors.

Gluing Laminations Technology:

Gluing motor rotor and stator laminations technology is a process that involves using a specialized adhesive(such as bonding varnish) to bond the silicon steel laminations together.

This adhesive is typically applied to the laminates in a thin layer before they are stacked and pressed together under pressure. The adhesive cures over time, creating a strong and durable bond between the laminations.

One of the key advantages of glue-dot electrical machine laminations is that it allows for precise control over the bonding process. The adhesive can be applied uniformly, ensuring that each lamination is bonded evenly. This results in a more consistent and reliable final product.

Additionally, gluing electric motor laminations can be a cost-effective bonding method, as it eliminates the need for expensive machinery and equipment. This makes it a popular choice for small-scale production or custom applications.

gluing motor core laminations

Batch Oven Technology:

Batch oven technology is one of the oldest and most traditional methods of bonding motor laminations. In this process, laminations are stacked together and placed in a batch oven, where they are heated at a specific temperature for a set duration to cure the bonding varnish (Backlack).

This method is well-established and traceable, making it suitable for smaller-scale production. However, it has longer cycle times and may not be ideal for large-scale productions due to heavy tools and longer curing times.

Continuous Furnace Technology:

Continuous furnace technology is an improvement over batch oven technology, allowing for faster curing times and higher throughput. In this method, laminations are continuously moved through a furnace, consisting of heating and cooling zones.

However, the asymmetric temperature distribution within the stack can lead to variations in stiffness and tensions, affecting the quality of the laminations. Furthermore, the continuous furnace requires careful adjustment of process parameters and may not be suitable for all geometries.

Adhesive Bonding in the Punching Tool:

Bonding in the stamping tool is a unique method that involves self-bonding rotor laminations and stator laminations as they are punched. A heating unit is installed below the punching die, which heats the laminations as they pass through.

While this method offers high-speed production and precision, it can also lead to lower stiffness, higher stacking errors, and shape tolerances. The conflict between heating unit temperature and room temperature for the punching tool must be managed, and compromises are often necessary.

Lamnow Electrical Steel Laminations Bonding Capabilities

self bonding motor lamination in NEVs

Lamnow, a pioneer in electrical steel laminations, boasts state-of-the-art electrical sheet stacking and bonding capabilities that set it apart in the industry. Our company leverages advanced technologies and roll coat processes to ensure precision, efficiency, and quality in the bonding of laminations.

Our lamination bonding process uses a roll coat process that applies an insulating adhesive bonding agent to the motor lamination sheets after punching or laser cutting.

One of Lamnow’s key bonding capabilities lies in its expertise in the use of various bonding technologies, including but not limited to self-adhesive technology, gluing technology, and mechanical bonding techniques. This diversified approach allows Lamnow to cater to diverse customer needs, from high-speed production to specialized applications requiring meticulous attention to detail.

Moreover, Lamnow’s innovative engineering team continuously refines and develops new bonding techniques, staying at the forefront of technological advancements. This commitment to innovation and excellence makes Lamnow a preferred partner for customers seeking superior quality and reliability in electrical steel laminations.


Different motor lamination bonding technologies offer varying advantages and limitations. Batch oven technology is well-established but has longer cycle times. Continuous furnace technology offers faster curing times but requires careful process parameter adjustment. Bonding in the punching tool allows for high-speed production but may result in lower stiffness and shape tolerances.

The self-bonding and glue bonding process is the most advanced, offering high-speed production, precision, and the highest quality laminations. As the industry continues to evolve, advancements in bonding technology will play a crucial role in improving motor lamination quality and performance.


What is the purpose of bonding motor core laminations?

The purpose of bonding motor laminations is to create a rigid and durable structure that can withstand the mechanical stresses and environmental conditions encountered in motor operation. Bonding laminations together ensures the components remain aligned and securely fastened, reducing the risk of vibration, noise, and mechanical failure.

Additionally, bonding helps to maintain the integrity of the magnetic circuit within the motor, optimizing its efficiency and performance. By providing a stable and robust foundation, bonded motor laminations contribute to the overall reliability and longevity of the motor, making them an essential component in various industrial and commercial applications.

What are the advantages of self-adhesive motor laminations?

Advantages of self-adhesive motor laminations, such as offering streamlined assembly processes, reduced cycle times, and increased throughput. They also provide improved thermal conductivity and durability, and eddy current losses compared to traditional bonding methods.

How does gluing technology compare to self-adhesive and traditional bonding methods?

Gluing technology, a traditional bonding method, involves applying a specialized adhesive to laminations before stacking and pressing them together. It offers precise control over the bonding process and can be cost-effective for smaller-scale production.

Full surface bonding technology, on the other hand, eliminates the need for additional adhesive by pre-applying an adhesive layer to laminations. This streamlines the assembly process but may have limitations in specific applications. Each method has its advantages and is selected based on factors like production scale, precision, and cost.

In which industries and fields are adhesive motor cores used?

Motor lamination bonding technologies are used in various industries and fields where the creation of electric motors is essential. This includes the automotive sector, where electric and hybrid vehicles rely on efficient and durable motor iron cores.

The industrial machinery and manufacturing industry also widely utilizes adhesive motor cores in equipment such as pumps, compressors, and conveyors.

Additionally, adhesive motor cores are used in household appliances like washing machines, dryers, and refrigerators.

This technology is also prevalent in the renewable energy sector, particularly in wind turbines and solar energy systems, which rely on high-performing and reliable electric motors.

What are the considerations for choosing the right bonding technology for a specific motor lamination application?

When selecting the appropriate bonding technology for a specific motor lamination application, several key considerations must be taken into account.

These include the required precision and tolerance levels, the desired throughput and production speed, the environmental conditions the motor will operate in, and the overall cost-effectiveness of the chosen method.

Additionally, factors such as the complexity of the motor’s geometry and the availability of advanced bonding technologies may also play a role in the decision-making process.

What are the methods of assembling the motor core in addition to bonding?

Aside from the bonding electrical steel lamination sheet, we provide laser welding, TIG welding, MIG welding, riveting, cleating, and interlocking to stacking motor laminations together form the rotor and stator cores.

Look for quality motor lamination

To learn more about our motor lamination manufacturing capabilities for your industry, contact our team today.