How to Choose Material for Lamination Stack Prototyping?

How the material for lamination stack prototyping is selected has a fundamental and far-reaching impact on motor design. The lamination core material affects characteristics such as output, heat rise, weight, and cost of the motor.

We’ll delve into the factors that drive your material choices, explore the differences between cobalt alloys, nickel alloys, amorphous alloys, and electrical steel, and equip you with the knowledge to make decisions.

What is Lamination Stack Prototyping?

Our lamination stack prototyping involves thin sheets of metal stacking on top of one another bonding together and assembling to form the core components of electric motors and transformers. We employ laser-cutting and wire-edm technologies to manufacture lamination prototypes.

Laser-cutting technology is a higher accuracy process. It allows for the creation of intricate shapes and patterns within the materials.

This precise cutting method ensures that each layer of the stack is uniform and aligned, minimizing energy loss and maximizing the overall performance of the end product. Laser-cutting is particularly advantageous when working with materials like electrical steel.

Wire EDM utilizes electrical sparks to erode and shape materials with exceptional precision. This process is particularly beneficial when dealing with conductive materials such as copper or aluminum, which commonly apply in the winding and conductor elements of motors and transformers.

Wire EDM enables the creation of intricate and complex geometries with minimal material waste.

prototype motor lamination

Types of Materials Suitable for Stator And Rotor Lamination

Electrical Steel

Electrical steel, also known as silicon steel or transformer steel. It’s our first choice for motor iron core manufacturing, especially when aiming for optimal magnetic performance.

We use electrical steel thickness can vary depending on the specific application. In lamination stack prototypes, we commonly use electrical steel laminations ranging from 0.1 to 1 millimeters (mm).

Thinner laminations reduce energy loss through eddy currents and hysteresis, enhancing the efficiency of electric motors and transformers.

Our electrical steel comes in two primary grades: grain-oriented (GO) and non-grain-oriented (NGO). GO steel is designed for applications where the magnetic field is primarily in one direction, such as power transformers.

NGO steel, on the other hand, is suitable for motors and generators where the magnetic field direction varies. In addition, Our silicon steel grades M15, M19, M22, M27, M36, and M45.

compound stamping materials

Nickel Alloy

Nickel alloys, renowned for their exceptional resistance to corrosion, high temperatures, and electrical conductivity, are prized materials used in motor lamination prototypes, particularly for applications in harsh environments. In many cases, we use nickel alloy laminations in the range of 0.1 to 0.5 mm.

Cobalt Alloy

Cobalt alloys have high tensile strength, excellent resistance to corrosion, heat, and wear and tear, and are a sought-after material for lamination stack prototyping, particularly in applications where durability is paramount.

Our cobalt-iron alloy laminations typically range from 0.1 to 0.6 mm in thickness, but the choice can vary based on the specific project.  Cobalt is a fantastic choice for high-performance applications that require high flux densities and no saturation.

Cobalt requires a specialized annealing process after stamping and improper annealing temperatures can damage the magnetic properties of the alloy. So this process needs an experienced team to complete.

Amorphous Alloys

Amorphous alloys, also known as metallic glasses, are beneficial due to their high electrical resistance and low core loss at high frequencies.

Factors to Consider When Choosing Materials

Electrical Properties

Electrical properties key factors include the material’s dielectric constant, dielectric strength, and loss tangent.

A dielectric constant refers to a material’s ability to store electrical energy, while dielectric strength indicates its ability to withstand electric stress without breaking down. The loss tangent represents the energy lost as heat during electrical conduction.

Thermal Properties

Thermal conductivity and the coefficient of thermal expansion (CTE) are vital considerations. CTE measures how it expands or contracts with changes in temperature. Thermal conductivity influences a material’s ability to dissipate heat efficiently.

Mechanical Properties

Lamination stack prototypes must endure mechanical stress. Tensile strength, flexural strength, and modulus of elasticity are key parameters to evaluate.

Tensile strength measures a material’s resistance to stretching, while flexural strength assesses its ability to withstand bending. The modulus of elasticity determines how a material deforms under stress.

Environmental Factors

Consider the environment in which your prototype will operate. Will it face extreme temperatures, humidity, or exposure to chemicals? Materials must be chosen to withstand these conditions, ensuring long-term functionality.

Time and Cost

Budget constraints can often influence material selection. While it’s essential to balance costs, remember that opting for cheaper materials may lead to performance compromises and higher long-term expenses

Ready to Customize Your Motor Prototyping with Motorneo?

At Motorneo, we have a variety of top-of-the-line high-speed presses and post-stamping capabilities. Our precision-engineered leveraging advanced laser-cutting and wire-EDM crafted motor lamination stacks.

Whether you’re in need of rapid prototyping, custom motor stator, and rotor lamination prototypes, or mass-production electric motor lamination solutions, our expertise can accommodate nearly any request for specialized solutions in a variety of industries, including aerospace, automotive, military, medical devices, energy, and more.

motor laminations from motorneo


The material selection process for lamination stack prototyping is a multifaceted endeavor. The use of motor core materials must be viewed very differently from the overall perspective of processability, cost, application areas, efficiency, and other technical factors of motor design.


What are the advantages of laminated stacking?

Reduced Eddy Current Losses: Laminating the core materials into thin layers significantly suppresses eddy current losses. By separating the core into laminations, the length of the conducting paths for eddy currents is minimized.

Improved Magnetic Properties: Lamination stacking allows for precise control over the orientation and arrangement of the core material. This optimization enhances the magnetic properties of the core, such as permeability and magnetic flux.

Reduced Heat Generation: Lower core losses translate into reduced heat generation within the core material. Cooler operating temperatures improve the longevity and reliability of electrical components, extending their operational life.

Noise Reduction: Laminated cores reduce the magnetostrictive effect, which is the phenomenon where magnetic materials change shape in response to magnetic fields.

Why is material selection critical in lamination stack prototyping?

The choice of materials significantly influences the performance of the final product. Different materials have varying electrical, magnetic, thermal, and mechanical properties. Selecting the right materials ensures that the prototype will meet the desired specifications and performance requirements.

What is the motor stator and rotor lamination?

The stator and rotor are fundamental components in electric machines, like motors and generators.

The stator is the stationary part of the motor, typically housing coils of wire and serving as the primary magnetic field source. It remains fixed in place and generates a magnetic field when an electric current flows through its windings.

In contrast, the rotor is the rotating element, often equipped with conductive windings or magnets. The rotor’s movement within the stator’s magnetic field induces an electromotive force, enabling mechanical work or electricity generation.

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

Why 0.2mm Silicon Steel Stamping Is More Expensive?

0.2mm silicon steel stamping is pricier due to its scarcity, precision demands, and unique properties. Thinner sheets minimize core loss, enhancing energy efficiency, but their production requires meticulous precision, often leading to higher manufacturing costs.

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