How to Manufacture Electrical Motor Stator & Rotor Stacks by Compound Die Stamping?

Are you looking to enhance the efficiency and precision of your motor lamination manufacturing process? Understanding compound die stamping can significantly elevate the production of electrical motor stators and rotor stacks. In this blog post, we will delve into this manufactured motor lamination by compound stamping technique. From the initial design to the final inspection, we will guide you through each phase of the process.

What are Stators and Rotors?

manufacturing motor iron core

The stator laminations and rotor laminations are the key components of the electric motor. The stator, a stationary part of an electric motor, typically consists of windings or laminations that create the magnetic field necessary for motor operation. Conversely, the rotor, positioned within the stator, rotates to produce torque and rotation.

Manufacturers often use silicon steel(electrical steel, lamination steel, transformer steel) for these components due to its excellent magnetic properties, which enhance efficiency while reducing core losses. New materials such as amorphous alloys, soft magnetic composite, and so on are used by more and more manufacturers to produce motor stator rotor cores.

Precision in the manufacturing of motor lamination stacks is paramount; even minor discrepancies in size or shape can lead to inefficient motor function, increased wear, and operational failures.

Understand Compound Die Stamping

The compound die stamping process involves a single stroke of an automation press to perform multiple actions, such as cutting and shaping, which greatly enhances production efficiency and reduces material waste.

Unlike progressive die stamping, which requires the material to move through several stations, compound die stamping completes multiple tasks at once at a single station. This capability not only speeds up production but also ensures greater dimensional accuracy and repeatability.

Compound stamping is cost-effective for medium and large motor laminations. Progressive stamping is suitable for small laminations and segmented stator laminations mass production.

Compound Die Stamping Manufacturing Process Step-by-Step

Materials Preparation

Start by choosing the appropriate material for your stator and rotor cores. Silicon steel(electrical steel) is commonly used due to its magnetic properties and low energy loss. Ensure the material is of the correct grade and thickness for your specific application.

Compound Die Setup

Choose the compound die that matches the design and shape of the stator and rotor stacks. The die will consist of upper and lower components designed to perform multiple operations in a single stroke.

Position the compound die in a hydraulic press. Ensure the press is properly calibrated and adjusted to accommodate the material thickness and the required tonnage for stamping.

Lamination Stamping Process

The automatic press uses the compound die to cut and shape the motor laminations in a single stroke. This not only maximizes efficiency but also maintains consistency across production batches. Operators must monitor this process closely to adjust settings and prevent any errors that might compromise the quality of the laminations.

Quality Control

After stamping, each batch undergoes a rigorous inspection to check for motor iron core flatness and verticality. Employing CMMs, projector inspection, and micrometer tools to check dimensions, hole sizes, slot sizes, and shapes. The technician should employ visual inspection to examine the surfaces for any blemishes, burrs, or imperfections.

Advantages of Compound Die Stamping

Manufacture motor lamination by compound stamping stands as a testament to the numerous advantages that compound die stamping offers, making it the highly attractive choice for producing stator and rotor stacks.


By reducing material waste and streamlining the manufacturing process, compound die stamping can significantly reduce production costs.

Precision and Consistency

The use of single tooling ensures that the alignment and spacing between features are maintained accurately across each part.

Time-Saving Benefits

Efficiency gains from combining multiple operations into one process result in faster production, allowing for quicker delivery times.

Application of compound die stamping motor iron core

Automotive Industry

Motor iron cores are used in the manufacturing of electric vehicle motors, starters, alternators, and hubs.

Industrial Machinery

Compound die stamping allows for the production of motor iron cores that meet the specific requirements of industrial applications. Such as pumps, conveyors, fans, and compressors.

Renewable Energy

Compound stamping motor lamination core applies to wind turbines, fire power generators, hydro generators, etc renewable energy applications.

Aerospace and Defense

Aerospace and defense industries use electric motors in various applications, including aircraft systems, radar equipment, and missile guidance systems.

rotor laminations application

Our Motor Lamination Stamping Capabilities

Motorneo motor laminate cores are used across various industries, including automotive(including hub motor), appliances, renewable energy, industrial machinery, and more.

Our team of experts possesses extensive knowledge in stamping, winding, stacking, bonding, and assembly electrical motor lamination manufacturing.

Having multiple 25ton – 300-ton punching allows us to deliver compound stamping motor cores with utmost precision and efficiency.


In conclusion, compound die stamping is a highly efficient and cost-effective method for manufacturing motor core lamination. Its ability to combine multiple operations into a single process, while maintaining precision and consistency, makes it an attractive choice for manufacturers in various industries.

As technology continues to advance, we anticipate that compound die stamping will play an even more significant role in the manufacturing landscape, further improving efficiency and sustainability.


What method is used to stack the laminated sheets of compound stamping together?

In the assembly of laminated sheets for compound stamping, several methods can be employed to stack and secure the sheets together.

Common techniques include riveting, where sheets are fastened with metal rivets, or cleating, which involves using specialized fasteners to hold the laminations in place.

Laser welding and TIG/MIG welding can be utilized for a more permanent and robust bond.

For applications where rigidity and insulation are essential, gluing with specialized adhesives can be employed.

How does compound stamping differ from progressive stamping?

Compound vs. progressive stamping, how much do you know? Compound stamping is a process that combines multiple operations (blanking, piercing, and forming) in a single die and press stroke.

Progressive stamping, on the other hand, involves a series of sequential operations on a metal strip as it moves through a set of dies.

Compound stamping is more suitable for medium and large motor lamination packs, while progressive stamping is ideal for high-volume, small laminates.

How does stamping compare to laser cutting for producing metal parts?

Stamping and laser cutting are different processes. Stamping is ideal for high-precision, repetitive, and high-volume production of metal parts, while laser cutting is more suitable for creating intricate designs and prototypes.

What materials are commonly used for stator and rotor stacks?

Silicon Steel (Electrical Steel): This is the most widely used material for stator and rotor stacks. Silicon steel is favored for its excellent magnetic properties, which reduce eddy current losses, a common inefficiency in motors.

Cold Rolled Lamination Steel (CRML): Similar to silicon steel, CRML is used for its good magnetic properties but is generally less expensive.

Nickel Alloys: These materials offer superior strength and heat resistance compared to silicon steels, as well as excellent magnetic properties at high temperatures.

Cobalt Iron (CoFe) Alloys: These materials are used in applications requiring very high magnetic saturation.

Amorphous and Nanocrystalline Metals: Amorphous metal laminations, made from rapidly cooled metals, have very low coercivity and high electrical resistivity, reducing both hysteresis and eddy current losses dramatically.

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