What Is Rotor Core Laminations?

The rotor core laminations are part of the motor’s magnetic circuit. Together with the stator core and air gap, it forms the entire magnetic circuit of the motor. The rotor core is generally made of 0.1mm-1mm thick silicon steel sheets. Most of the rotor cores of medium and small AC motors are directly installed on the motor shaft. The rotor core of a large AC motor is installed on the rotor bracket, and the bracket is sleeved on the rotating shaft.

rotor core laminations

The Role of Rotor Core Laminations in Motors

Rotor core lamination is one of the core components of motor and generator rotors. During the operation of the motor, the current will generate a strong magnetic field, which further generates a rotating magnetic field through the rotor core and the rotor guide shaft, and then drives the rotor to rotate. Its role is very critical.

Benefits of Rotor Lamination Stacks

The rotor core made of high-performance silicon steel sheet material has very significant advantages in improving motor efficiency and stability. The low hysteresis characteristics and low eddy current loss of silicon steel sheets enable the rotor core to withstand higher magnetic flux density and improve the efficiency of the rotor.

Manufacturing Process of Rotor Core Laminations

Material Selection

The most common thin metal sheet material used for rotor core laminations is high-grade silicon steel, also known as electrical steel.

Silicon steel exhibits excellent permeability and low electrical conductivity, making it ideal for reducing core losses and eddy currents in the motor.

Thin-gauge electrical steel is ideal for applications with high performance and energy-efficiency requirements.

Lamination Prototype

Before moving into full-scale production, engineers often create prototypes of the electric motor laminations. Prototyping allows for testing and refining the design, ensuring that it meets performance and efficiency requirements. This phase may involve the creation of a small batch of laminations for testing purposes. We employ laser cut laminations and wire-EDM process for prototypes.

Die Design and Manufacture

Dies are precision tools that shape and cut the laminations with high accuracy. The die design process takes into account the desired lamination shape, size, and stacking arrangement.

Stamping and Cutting

With the dies in place, the silicon steel sheets are fed into a stamping press. The press exerts significant force to precisely shape and cut the laminations according to the die’s specifications. We have compound die stamping, rotary notching, and progressive stamping technology.

Stacking and Assembly

Motor lamination stacking and assembly involve assembling individual laminations, which are thin metal sheets, to form the core of an electric motor rotor. We offer riveting, cleating, laser welding, TIG+MIG welding, gluing, and self-bonding process for bonding motor laminations together. This assembly process is crucial for reducing eddy current losses and ensuring the structural integrity of the motor.

lamination stacks of industry motor cores

Applications of Rotor Laminations

Automotive Industry

Electric vehicles, HEV, high-speed passenger cars, electric heavy trucks, electric tricycles, electric bikes, electric hoverboards, and electric scooters.

Industrial Machinery

Conveyor belts, pumps, fans, compressors, and robotic arms.

Renewable Energy

Wind turbines and hydroelectric generators.

Elevator Tractor

Escalator and elevator lift traction.

Home Appliances

Washing machines, refrigerators, air conditioners, fans, mixer grinders, vacuum cleaners, ovens, coffee machines, juicers, hand blenders, and sewing machines.

Power Tools

Electric drills, grinders, saws, angle grinders, sanders, lawnmowers, and pruning shears machines.

HVAC Systems

Heating, ventilation, and air conditioning systems.

rotor laminations application

Motorneo – professional motor lamination manufacturer in China

Motorneo custom rotor laminations types include squirrel cage rotor, aluminum die-cast rotor, copper die-cast rotor, double cage rotor, permanent magnet motor rotor, induction motor rotor, servo motor rotor, brushless DC motor rotor, universal motor rotor, shade pole motor rotor, and asynchronous motor rotor.

To give our customers the best results, we provide compound stamping, progressive stamping, and rotary notching to manufacture our laminations. We use laser cutting and wire-EDM technology to prototype lamination for customers.

compound stamping motor lamination manufacturer


As one of the core components of the motor rotor, the rotor core is made of high-quality silicon steel sheet material, which can improve the rotor efficiency and stability of the motor. When designing and manufacturing motors, it is very important to choose the appropriate rotor core material, which can greatly improve the efficiency and service life of the generator.


What are the advantages of using silicon steel for rotor laminations?

Silicon steel is preferred for rotor laminations due to its excellent magnetic properties, low electrical conductivity, and high resistance to eddy current losses. It helps improve motor efficiency and reduces energy wastage in the form of heat.

What is the difference between the stator and rotor laminations in an electric motor?

We know what rotor and stator laminate are, so let’s dive into the key differences between stator and rotor of electric motors.

Different Structures

The rotor is the moving part of the motor and usually consists of a magnetic core and windings, while the stator is the static part of the motor and usually consists of an iron core and coil windings.

Different Movement States

The rotor is the rotating part of the motor. It is generally driven to rotate by electromagnetic force and plays a role in converting energy in the motor. The stator is the immobile part of the motor, usually stationary, and forms a magnetic field through the coil windings to form the stator magnetic field of the motor.

Different Functions

The rotor is the rotating part and is the power source of the motor. The stator is the fixed part and plays the role of maintaining the magnetic field.

Are Iron Core laminations customized for different motor applications from China manufacturers?

Yes, electric motor laminations can be customized to meet the specific requirements of different motor applications. The shape, size, and design of the laminations can vary based on factors such as torque, speed, and efficiency needs.

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