Electric Motor Lamination Bonding Technology

The stator and rotor laminations of the motor are manufactured using silicon steel sheets laminated together to minimize eddy current losses. Electric motor lamination bonding technology is when individual laminations are stacked together to form a complete core. The choice of stacking technology depends on motor design and economic considerations.

motor stator core laminations

Significance of Motor Lamination Bonding

Lamination bonding ensures that the laminations remain firmly in place, preventing the risk of delamination or shifting, which could lead to motor failure. Bonding eliminates the need for a rivet joint or welding of the magnetic cores, which in turn reduces interlaminar loss. Bonded laminations help dampen vibrations and reduce noise levels in motors.

Technology for Electric Machine Lamination Stacking

Adhesive Bonding


The bonding process of laminations is fairly straightforward. After laminations stamping or laser cutting, the bonding adhesive is applied via a roll coating process or dip tank process.

Once laminations have cooled and are able to be handled, they are stacked into custom fixtures that are precisely compressed. The stacked fixtures go back into a furnace and are heated again for a specific period of time until the bonding.

The bonding technology includes glue bonding and self-bonding. This process provides a strong bond that enhances structural integrity and improves thermal management by filling gaps between laminations, thereby reducing eddy currents.


The best alternative to welding the stack is to bond laminations. Motor iron core fabrication to create strong and reliable bonds between laminations uses techniques like TIG+MIG welding, laser welding, and MAG welding.

The laser welding process focuses a high-intensity laser beam on stamped stator and rotor lamination stacks. It melts the metal material through a laser-generated heat source.

TIG welding(Tungsten Inert Gas) is a bonding metal process. This process utilizes a non-consumable tungsten electrode to create an electric arc that generates the heat required to melt and fuse the welded metals.

In the MIG welding process, an electric arc is formed between the metal being welded and a continuously fed wire electrode, melting the wire and the base metals.

MAG welding is a mixed gas-shielded welding in which a small amount of oxidizing gas (oxygen, carbon dioxide, or mixed gas) is added to argon.

laser welding

Mechanical Fasteners

Mechanical fasteners like rivets, bolts, cleating, or clinches use secure laminations. These methods offer simplicity and durability.


The interlocking process is carried out in a progressive stamping die, and the interlocking points of each motor stack are interlocked layer by layer to form a completed motor core.

Get A Custom Bonding Electric Motor Core Solution.

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.

Motornro offers a wide range of lamination bonding techniques, including gluing, self-bonding, welding, riveting, and cleating.


Electric motor lamination stacking is the functionality and efficiency of electric motors. Through this blog, you can learn various lamination bonding technology. Learn its fundamental importance in reinforcing structural integrity, enhancing electrical performance, and reducing noise and vibration.


Why are motor laminations bonded?

Bonding motor laminations reduces eddy currents, which are circular electric currents that generate heat and reduce efficiency. Bonding also improves the structural integrity of the motor.

Which bonding method provides the best insulation?

Adhesive bonding provides excellent electrical insulation because the adhesive material also serves as an insulating layer between the laminations.

What are the cost implications of different lamination bonding techniques?

Adhesive bonding is generally less expensive in terms of equipment cost but may require more in terms of labor and materials. Welding can be more cost-efficient at high volumes due to automation.

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