Choosing the Right Adhesive for Stator and Rotor Laminations: A Comprehensive Guide

When it comes to manufacturing efficient electric motors, every detail matters, including the choice of adhesive for bonding stator and rotor laminations. The adhesive’s selection can significantly impact the motor’s performance, durability, and overall efficiency.

In this comprehensive guide, we’ll explore the various aspects of selecting the right adhesive for rotor and stator laminations, from understanding adhesive types to factors influencing the choice, bonding techniques, and even eco-friendly options.

What Are Adhesives for Laminations?

Adhesives for laminations, also known as lamination adhesives or bonding adhesives, are specialized materials used to join together stamped laminations in the construction of various devices, such as electric motors, transformers, and generators. These adhesives are designed to securely bond laminations, forming a solid core structure.

In the context of electric motors, laminations are typically made of magnetic materials like iron or electrical steel and stacked together to create the stator and rotor cores. The adhesive plays a crucial role in holding these laminations in place, ensuring they remain tightly bonded during the motor’s operation.

glue fastening motor lamination

Types of Adhesives

In the realm of electric motor manufacturing and lamination bonding, commonly used for several types of adhesives, each with its unique properties and advantages.

The choice of adhesive type depends on various factors, including the motor’s intended application, operating conditions, and specific bonding requirements. Here are some of the most commonly use types of adhesives:

Epoxy Adhesives

Properties: Epoxy adhesives have exceptional temperature resistance, making them suitable for motors operating in high temperature environments. They also exhibit strong bonding capabilities.

Advantages: Epoxy adhesives provide excellent structural stability and durability, ensuring that lamination stacks remain securely bonded even under extreme conditions. They commonly apply in demanding motor applications.

Polyurethane Adhesives

Properties: Polyurethane adhesives offer good flexibility and electrical insulation properties. They are versatile and can be used in a wide range of motor types.

Advantages: Polyurethane adhesives provide reliable bonding without sacrificing flexibility, which can be essential in applications where the motor components experience movement or vibrations. They are known for their ease of use and compatibility with various materials.

Silicone Adhesives

Properties: Silicone adhesives are characterized by their high-temperature resistance and exceptional electrical insulation properties. They are also known for their flexibility.

Advantages: Silicone adhesives excel in applications where motors operate in extreme temperature conditions, including those with rapid temperature fluctuations. Their excellent electrical insulation properties make them suitable for high-voltage applications.

Acrylic Adhesives

Properties: Acrylic adhesives are known for their fast curing times and good temperature resistance.

Advantages: These adhesives are often chosen when a quick bond is required, and they can withstand moderate temperatures. They are commonly used in applications where efficiency and speed of production are critical.

Cyanoacrylate (Super Glue)

Properties: Cyanoacrylate adhesives, commonly known as super glue, provide rapid bonding and are suitable for bonding small components.

Advantages: Super glue is often used when quick, strong, and precise bonding is needed, particularly in small-scale applications. It is known for its fast curing time.

epoxy adhesives

Key Properties to Consider For Adhesives Selection

When selecting an adhesive for bonding stator and rotor laminations in electric motors, several key properties must be carefully considered to ensure the adhesive’s suitability for application.

These properties play a crucial role in determining the adhesive’s performance and its ability to create a strong and reliable bond. Here are the key properties to consider:

Temperature Resistance

Motors can generate heat during operation, and laminations may be exposed to high temperatures. The adhesive must have the ability to withstand these temperatures without degrading or losing bonding strength.

Electrical Insulation Properties

Electric motors insulate between laminations to prevent short circuits. The adhesive should provide effective insulation to ensure the motor’s electrical performance and safety.

Bond Strength

The adhesive’s ability to create a strong and durable bond between laminations is critical for the structural integrity of the motor core. A weak bond can lead to delamination and motor failure.

Environmental Considerations

Motors can be exposed to various environmental conditions, including moisture, chemicals, and contaminants. The adhesive must be compatible with these conditions to maintain its performance.

Adhesive Type

Different types of adhesives (e.g., epoxy, polyurethane, silicone) offer varying properties and advantages. The adhesive type should align with the motor’s requirements.

Curing Time and Process

The adhesive’s curing time and process can impact production efficiency. Longer curing times may lead to production bottlenecks, while shorter curing times may require rapid assembly.

Select an adhesive with a curing time that aligns with your production needs. Some adhesives offer fast curing options, while others may require longer curing times for maximum bond strength.


Assess the adhesive’s cost in relation to its performance and durability. Consider long-term cost savings, including maintenance and replacement costs.

Adhesive Bonding Process

adhesive bonding process

Achieving strong and durable bonds between rotor and stator laminations involves a combination of proper surface preparation, adhesive application methods, curing processes, and stringent quality control measures.

Surface Preparation and Cleaning

Before coating adhesive, ensure that lamination surfaces are clean, free from contaminants, and properly prepared to promote optimal bonding.

Proper Adhesive Application Methods

Use appropriate application methods to ensure adhesive is evenly distributed, avoiding excess or inadequate coverage.

Curing and Drying Processes

Proper curing and drying processes are crucial to allow the adhesive to set and create a strong bond. Follow manufacturer recommendations for curing times and temperatures.

Quality Control Measures

Implement quality control checks to ensure uniform bonding, including adhesive thickness, bond strength, and visual inspections. Consistency is key to motor reliability.

Application Areas Of Adhesive Motor Core

rotor laminations application


Punch and adhesive stator and rotor lamination cores are used in electric vehicles (EVs), hybrid vehicles, and traditional automobiles, contributing to efficient and compact electric powertrains.

Industrial Machinery

Rotor and stator bonding laminations are integral to various industrial motors, including conveyor systems, pumps, compressors, and manufacturing equipment.

Renewable Energy

Wind turbines and solar tracking systems rely on adhesive motor cores to harness and convert renewable energy efficiently.

Home Appliances

Adhesive motor cores power household appliances such as washing machines, refrigerators, and HVAC systems.


Aerospace applications use electric motors with adhesive cores in systems ranging from aircraft actuators to satellite mechanisms.

Medical Devices

Medical equipment, including MRI machines and surgical tools, often incorporate motors with adhesive cores for precise and reliable operation.

Consumer Electronics

Electric motors in devices like smartphones, cameras, and drones benefit from adhesive cores for compact design and energy efficiency.

Our Gluing Technology For Motor Iron Core

Our state-of-the-art manufacturing processes ensure that the motor stator and rotor laminations assemblies and bond together, creating motor cores of exceptional quality and durability.

With years of expertise in the field, we have perfected our gluing techniques to meet the stringent demands of various industries.

Our commitment to precision and innovation ensures that our clients receive motor iron cores that not only excel in performance but also contribute to increased energy efficiency and reduced operational costs.

Whether you require custom solutions or standardized motor iron cores, our gluing technology guarantees a level of craftsmanship that exceeds expectations, making us the preferred choice for motor manufacturers worldwide.

TIG welding Motor Lamination


In conclusion, selecting the right adhesive for stator and rotor laminations is a critical aspect of motor manufacturing that significantly impacts performance, efficiency, and durability.

By understanding the various adhesive types, key properties, and factors influencing the selection process, manufacturers can make informed choices that lead to optimized motor performance.

Adhesive bonding techniques, eco-friendly options, and strategies to address common challenges further contribute to successful motor manufacturing.

As industries continue to prioritize sustainability and efficiency, making the right adhesive choices will be paramount in driving innovation and progress in electric motor manufacturing.


Why is adhesive selection important in the manufacturing of electric motors?

Adhesive selection is crucial because it directly affects the motor’s performance, efficiency, and durability. The right adhesive ensures that laminations remain securely bonded, contributing to a motor’s structural integrity and long-term reliability.

What is the difference between adhesive and self-adhesive?

Here are the key differences between self-bonding iron cores and gluing iron cores:

Bonding Mechanism:

Self-bonding cores rely on the inherent magnetic attraction or bonding force between laminations to hold them together. No external adhesives are required.

Gluing cores depend on adhesives to create a bond between laminations. These adhesives must be carefully applied and allowed to cure.


Self-bonding cores are known for their high efficiency because there are no additional materials (adhesives) that can introduce energy losses.

Gluing cores may introduce inefficiencies due to the presence of adhesive materials, which can lead to losses over time.

Manufacturing Process:

The manufacturing process for self-bonding cores involves specialized techniques to ensure laminations bond together inherently.

Gluing cores involve the application of adhesive materials during the stacking process, requiring careful attention to adhesive quality and application.


Self-bonding cores often offer enhanced mechanical strength because they rely on the inherent magnetic attraction, reducing the risk of delamination.

Gluing cores may be susceptible to delamination or degradation of adhesive bonds over time.

What are the advantages of adhesive motor core?

The use of adhesive in motor cores, specifically for bonding stator and rotor laminations, offers several advantages that enhance the performance, efficiency, and overall quality of electric motors. Some of the key advantages of using adhesive in motor cores include:

Improved Structural Integrity:

Adhesive bonding creates a strong and durable connection between laminations, preventing delamination or separation during the motor’s operation. This improves the overall structural integrity of the motor.

Enhanced Efficiency:

Proper adhesive application minimizes air gaps between laminations, reducing core losses and improving the motor’s overall efficiency. Lower core losses lead to reduced energy consumption and increased motor efficiency.

Vibration Dampening:

Adhesive bonding can help dampen vibrations within the motor, reducing noise and vibrations that may affect motor performance and longevity.

Higher Torque and Power Density:

The reduced core losses achieved through adhesive bonding can lead to increased torque and power density, allowing motors to deliver more power in a compact design.

Improved Thermal Conductivity:

Adhesives with high-temperature resistance properties help dissipate heat generated during motor operation, contributing to improved thermal performance and preventing overheating.

Reduced Eddy Currents:

Properly bonded laminations can minimize eddy currents within the core, which can lead to energy losses. Reduced eddy currents contribute to higher motor efficiency.

Design Flexibility:

Adhesive bonding allows for more intricate and complex motor core designs, enabling motor manufacturers to optimize core geometries for specific applications.

Corrosion Resistance:

Some adhesives offer corrosion-resistant properties, which can be beneficial in applications exposed to moisture or corrosive environments.

Simplified Assembly:

Adhesive bonding can simplify the electric motor assembly process, as it eliminates the need for mechanical fasteners, such as bolts or rivets. This streamlines production and reduces assembly time.

What bonding technology is commonly used for electric motor laminations in China?

In China, various bonding methods include riveting, cleating, interlocking, glue fastening (conventional bonding), welding processes (TIG welding, MIG welding, laser welding), and emerging technologies like self-bonding. Each method offers distinct advantages based on the motor’s requirements.

Try to contact us for high-quality motor cores in China.