What Is Motor Lamination Stacking Technology, And How Does It?

Electric machines drive our modern world, propelling everything from household appliances to industrial giants. But have you ever wondered how these motors achieve such remarkable efficiency and performance? Enter Motor Lamination stacking Technology – the ingenious technique at the core of electric motor design.

In this blog, we will delve into the technology of motor lamination stacks, exploring its principles, benefits, and how it revolutionizes the performance of electric machines.

Fundamentals of Motor Lamination Stacking

motor lamination stacks

Motor lamination stacking technology involves assembling thin, insulated steel sheets known as laminations to create the core of a motor. These laminations are stacked together with electrically insulating layers in between to reduce eddy current losses and improve the motor’s efficiency and performance.

Motor Lamination Stacking Process

Preparing the lamination

The motor laminations are manufactured through a cutting and stamping process, where thin sheets of electrical steel are cut into the desired shape and size.

stacks sequence and orientation

The order in which the laminations stacks and their orientation significantly impact the motor’s performance. Designers carefully arrange the laminations to optimize magnetic flux paths and reduce energy losses.

Motor Core construction and assembly

lamination stacks process


Riveting involves joining the laminations using metal rivets, inserted through pre-drilled holes, and then secured by deforming the rivet ends. It is a widely used method for assembling medium-sized motors. It provides excellent mechanical strength and stability to the core.


Cleating uses small metal tabs or cleats inserted between the laminations and bent to interlock them. This method allows for an efficient and cost-effective way to assemble the core without additional fasteners.


Laser welding is a precise and fast method that involves melting and fusing the edges of the laminations. TIG and MIG welding involves using electric arcs to join the laminations with the help of filler material. Welding ensures a robust and reliable bond, making it suitable for high-performance motors.


Self-bonding laminations have a layer of adhesive material. When stacked together for pressing, the adhesive activates, creating a solid bond between the laminations without additional fasteners or welding. Self-bonding adhesive bonding allows compliance with the narrowest tolerances and excellent shape stability because of the laminations.  Self-bonding simplifies the assembly process and reduces the risk of contamination from external bonding agents.

Industrial Applications of Motor Lamination Stacking Technology

Electric Motor lamination stacks technology is used in various applications, including industrial motors, electric vehicles motor, hybrid electric vehicles motor, wind/fire power generator, etc. These laminations serve an essential purpose by powering heavy machinery with superior efficiency.

motor lamination stacks applications

Advantages of Motor Lamination Stacking Technology

Reduced eddy current losses

The primary benefit of lamination stacks is the significant reduction in eddy current losses. Engineers can minimize energy dissipation and improve motor efficiency by using insulated laminations.

Improved Thermal Conductivity

Motor lamination stacks enhance thermal conductivity by providing continuous paths for heat flow through the core. This feature helps efficiently dissipate heat generated during motor operation, preventing overheating and promoting optimal performance.

Lower noise and vibration levels

Lamination stacks help minimize undesirable noise and vibrations, leading to quieter and smoother motor operation.

Motor Core Lamination Bonding Process From Motorneo

Motorneo is capable of full-process stator and rotor sample production and mass production from raw material procurement, wire cutting, stamping, gluing, or welding lamination.

We have multiple various types of high-speed punching machines and multiple disc motor stator punching machines. The largest high-speed punching machine is 350 tons and can produce iron cores with a maximum outer diameter of 1250mm.

We also have three-dimensional coordinate inspection, two-dimensional inspection, core iron loss inspection, stator component voltage withstand inspection, inter-turn inspection, CRH inspection, insulation resistance inspection, and other performance and size inspection capabilities to meet different customer needs.


As advancements in manufacturing techniques continue to evolve, the importance of mastering this technology grows. Whether through manual or automated stacking processes, the accuracy of lamination stacking plays a pivotal role in enhancing motor efficiency and longevity.


How are motor laminations manufactured in China?

Motor laminations typically use a stamping process. In this process, large sheets of electrical steel are fed into a stamping press, which uses a die to cut the sheets into precise shapes and sizes. The stamped laminations and remaining sheet metal are separate.

Are there any other techniques used in the manufacture of motor cores?

Aside from stamping, lamination stacking, and bonding, the motor cores manufactured also use other techniques. These may include lamination prototype design, laser cutting, wire cutting, and stator winding.

Which materials are commonly used in the manufacture of motor cores?

The most common material used to manufacture motor cores is electrical steel, also known as silicon steel or transformer steel. Its low core loss and high magnetic permeability make it ideal for minimizing energy losses and maximizing motor efficiency. A small portion uses alloys, such as amorphous alloys, nickel alloys, and cobalt alloys.

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