What are Electric Motor Laminations?

Whether you’re an enthusiast exploring the inner workings of electric motors or an industry professional seeking to optimize motor design, understanding what motor laminations are and their significance is essential.

At our manufacturing facility in China, we specialize in the production of custom stator and rotor laminations, offering a range of services such as compound die stamping, rotary notching, progressive die stamping, prototyping, and more. Our expertise lies in creating these precision-engineered laminations.

In this blog post, we’ll delve into electric motor laminations, shedding light on what they are, why they matter, and how they contribute to the efficiency and performance of electric motors.

Understanding Motor Laminations

Motor laminations, also known as motor cores or iron cores, are an essential part of electric motors. These thin, stacked sheets of magnetic material, typically made from silicon steel or sometimes nickel alloys, play a crucial role in the motor’s performance. They serve as the core for both the stator and rotor, the primary components responsible for converting electrical energy into mechanical motion.

motor lamination stacks

Materials Used for Electric Motor Core

Silicon Steel

Thin-gauge electrical steel is ideally suitable for applications with energy efficiency and high-performance requirements. This material offers excellent magnetic properties.

We commonly use electrical steel laminations ranging from 0.1 to 1 millimeter (mm). In addition, we use grades of electrical steel like M15, M19, M22, M27, M36, M45, etc.

motor core materials

Nickel Alloys

In certain high-performance or specialized applications, nickel alloys may be used for electric motor laminations. These alloys provide exceptional magnetic properties and corrosion resistance, but they are generally more expensive than silicon steel.

Cobalt Alloys

Cobalt alloys have high tensile strength, excellent resistance to corrosion, heat, and wear and tear, and are a sought-after material for lamination. It is a fantastic choice for high-performance applications that require high flux densities and no saturation.

Material selection for motor laminations depends on factors such as motor design, intended use, time, and cost considerations.

Types of Motor Laminations

Motor laminations can be categorized into two main types, based on their location within the motor:

Stator Laminations: Stator laminations form the stationary part of the motor and surround the rotor. They contain the motor’s windings and play a vital role in generating the magnetic field necessary for motor operation.

Rotor Laminations: Rotor laminations, on the other hand, are located within the rotating part of the motor. These laminations are responsible for inducing currents and magnetic fields that interact with the stator to produce mechanical motion.

This distinction between stator and rotor is crucial, as it defines the core operating principles of electric machines.

Manufacturing Process of Motor Iron Core

We produce electrical laminations and lamination segments ranging from 50 mm – 1250 mm in diameter and quantities ranging from several thousand to several million. The manufacturing process of motor laminations is a highly specialized and precise operation.  The main methods of manufacturing motor laminations:

Cutting and Stamping

Whether silicon steel or nickel alloy, we use slitting machine-cut materials to strip. Motor laminations are made from thin coils of electrical steel that are run through automated press lines into large presses that contain progressive or compound tooling that stamps the thin laminations from the steel. In addition, laser cutting can also be utilized for prototype lamination needs.

Annealing and Coating

The laminations undergo annealing, a heat treatment process that relieves internal stresses and enhances magnetic properties. They may also be coated and insulated to improve their resistance to corrosion and enhance their electrical insulation.

Stacking and Assembly

Once the laminations are prepared, they are stacked, bonded, and assembled together to form the core, either for the stator or rotor. We have comprehensive in-house stacking capabilities that include riveting, cleating, welding, gluing, self-bonding, interlock, etc.

Quality Control

We have ISO9001:2008 certification. The Coordinate Measuring Machines (CMM) and Projector Detectors are our quality test tools.  In addition, includes dimensional checks, magnetic property testing, and visual inspections.

visit the industry electric motor core factory

Benefits of Stator And Rotor Laminations

Enhanced Efficiency

Motor laminations reduce energy losses within the motor, leading to improved overall efficiency. This efficiency translates into lower energy consumption and reduced operating costs.

Minimizing Eddy Currents

Eddy currents are circulating currents induced in the motor iron core laminated due to magnetic field variations. Motor laminations are designed to minimize these eddy current losses, as they can lead to unwanted heat generation and energy loss.

Improved Motor Performance

By minimizing energy losses and thermal conductivity, motor laminations contribute to better motor performance, including smoother operation, reduced noise, and increased reliability.

Energy Conservation

In an era where energy conservation is of paramount importance, motor laminations play a vital role in reducing the carbon footprint of electric motors across various applications.

Electric Motor Different Types

Motor laminations find applications in various types of electric motors, including:

AC Motors

Alternating current (AC) motors, whether used in industrial machinery or household appliances, benefit from motor laminations. They contribute to the efficiency and reliability of AC motor operation.

DC Motors

Direct current (DC) motors, commonly found in applications like robotics and electric vehicles, also utilize motor laminations. Their use in DC motors enhances their performance and energy efficiency.

Specialized Motors

In addition to general-purpose motors, specialized motors used in industries such as aerospace, healthcare, and automotive also rely on motor laminations to optimize their performance.

Get high-quality Motor Lamination Stacks

If you’re in need of top-quality custom rotor and stator laminations, look no further. Our China-based manufacturing facility specializes in offers a market-leading electrical steel manufacturing service, specializing in the production of motors and generators, stators and rotors, and segmented laminations.

With our commitment to precision engineering and cutting-edge technology, we ensure that your electric motors operate at peak efficiency.

Whether you’re an industry professional seeking reliable motor lamination solutions or simply curious about how we can support your motor iron core manufacturing needs, don’t hesitate to contact us now to discuss your specific requirements and discover the difference that our expertise can make.

compound stamping motor laminations


As a motor lamination manufacturer based in China, our commitment to precision engineering and excellence is unwavering. We specialize in providing custom electric motor laminations services, ensuring that your electric motors operate with the utmost efficiency and reliability.

Whether you’re a seasoned industry professional looking for reliable motor lamination solutions or someone embarking on a motor-related project, we invite you to explore the possibilities with us. Our expertise, combined with cutting-edge technology, allows us to meet your specific motor manufacturing needs.


What are eddy currents, and why are they a concern in electric motors?

Eddy currents are circulating currents induced in the motor core due to magnetic field variations. They can lead to unwanted heat generation and energy loss in electric motors, which is why motor laminations are designed to minimize them.

How to find provide custom rotor and stator core China manufacturer?

Finding a reliable custom stator and rotor lamination manufacturer in China involves a systematic approach to ensure that you partner with a reputable and capable supplier. Here’s a step-by-step guide on how to find and select the right manufacturer:

Define Your Requirements:

Begin by clearly defining your specific requirements for custom stator and rotor laminations. Consider factors such as materials, dimensions, quantities, quality standards, and any special features or customization needed.

Market Research:

Conduct thorough market research to identify potential manufacturers in China. Use various sources, including online directories, trade shows, industry associations, and referrals from colleagues or business partners.

Online Directories:

Explore online platforms and directories that list manufacturers in China. Popular websites like Alibaba, Made-in-China, and Global Sources are valuable resources for finding suppliers. You can search for specific products and filter results based on your criteria.

Verify Credentials:

Look for manufacturers with relevant certifications and quality assurance standards. ISO 9001 certification is a good indicator of a manufacturer’s commitment to quality. Additionally, check for industry-specific certifications if applicable.

Company Background and Reputation:

Research the background and reputation of potential manufacturers. Read reviews and testimonials from other clients to gauge their satisfaction. Consider the manufacturer’s experience and track record in producing laminations for electric motors.


Initiate contact with potential manufacturers and engage in clear communication. Ask questions about their capabilities, production processes, lead times, and pricing. A responsive and informative manufacturer is a positive sign.

Samples and Prototyping:

Request samples or prototypes to evaluate the manufacturer’s product quality and suitability for your application. This step helps ensure that the laminations meet your specifications and standards.

Factory Visit:

If feasible, consider visiting the manufacturer’s facility in China. This allows you to assess their production capabilities, quality control measures, and overall professionalism firsthand.

Negotiation and Contracts:

Once you’ve identified a suitable manufacturer, negotiate terms, including pricing, lead times, payment terms, and any other contractual agreements. Ensure that all terms are documented in a formal contract.

Quality Assurance:

Establish a quality assurance process to monitor the production of your custom laminations. This may include inspections, testing, and quality checks at various stages of production.

Stay Informed:

Keep up to date with industry trends and changes in regulations that may impact your partnership with the manufacturer.

How to maintain the motor iron core laminated?

Regular Inspections:

Conduct routine visual inspections of the motor core. Look for signs of wear, damage, or corrosion on the laminations, such as rust, cracks, or loose laminations. Address any issues promptly.


Keep the motor core and surrounding areas clean and free of debris. Dust and contaminants can accumulate on the laminations, reducing efficiency and causing overheating.

Temperature Monitoring:

Monitor the operating temperature of the motor during regular operation. Excessive heat can be a sign of problems within the motor core, such as increased resistance or eddy currents. Investigate and address high-temperature issues promptly.


If your motor has bearings or moving parts near the core, ensure that they are properly lubricated according to the manufacturer’s recommendations. Lack of lubrication can lead to increased friction and wear on the laminations.


In cases where the motor experiences unbalanced loads or vibrations, address these issues to prevent uneven wear on the laminations and related components.

Protection from Moisture:

Motors should be protected from moisture, especially in humid or wet environments. Moisture can lead to rust and corrosion on the laminations. Consider using protective coatings or enclosures to shield the motor core from moisture.

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