The Importance Of Progressive Flushing In Stator And Rotor Lamination Design

With the continuous development of motor manufacturing technology, modern stamping technology has been used to manufacture motor cores. Nowadays, it is increasingly accepted by motor manufacturers, and the processing methods for manufacturing motor cores are becoming more and more advanced. We’ll delve into the significance of progressive flushing in stator and rotor, its relevance to riveting, and how it all ties into creating efficient motor rotors and stator laminations.

What Is Progressive Punching

Progressive punching, or progressive die stamping, is used for producing motor laminations, which are the thin metal parts that make up the core of the stator and rotor in electric motors. This method is particularly suited for high-volume production and is favored for its precision and cost-effectiveness.

Progressive stamping involves a series of stamping stations arranged within a single tool—known as a progressive die. Each station performs a different cut, bend, or forming operation. The electrical steel strip moves through the progressive die, with each station performing a part of the overall process until the final core lamination shape is achieved at the end of the die.

progressive stamping

The Progressive Stator Rotor Interlocking Process

Progressive impact stator rotor self-riveting(interlocking) is used in the production of electric motor components, particularly stator and rotor laminations.

This process involves a series of precisely mechanical impacts to form integral rivets or tabs on the laminations. The key steps typically include feeding a silicion steel strip into the progressive impact stator rotor interlocking machine, where it undergoes a series of operations. 

Holes or notches are punched in the metal strip at precise locations. Then, specialized stamping dies apply carefully calculated force to create interlocking points or tabs through a controlled impact process.

These rivets serve to interlock adjacent laminations, securely stacking them together while eliminating the need for additional fasteners like screws or rivets. 

This streamlined and efficient method not only enhances the structural integrity of the motor components but also reduces manufacturing costs and assembly time, making it a crucial technique in the production of high-quality electric motors.

progressive stator rotor self-riveting Process

Key Criteria For Progressive Flushing

Slot Geometry

The shape and size of slots in the rotor and stator core affect motor efficiency. Progressive flushing ensures that these slots are precisely tailored to meet the motor’s requirements.

Material Selection

Choosing the right materials(such as silicon steel, nickel alloy, cobalt alloy, etc.) for laminations is essential for minimizing energy losses and enhancing magnetic flux properties.

Insulation Methods

Effective insulation is critical to prevent eddy current losses. Progressive flushing can include insulation techniques that further reduce these losses and improve motor stator or rotor efficiency.


Every motor application is unique, and customization is key to meeting specific requirements. Progressive flushing custom addresses the specific needs of different motor cores, optimizing their performance.

Advantages Of Progressive Flushing In Stator And Rotor Lamination Design

Now that we’ve explored the fundamentals. Let’s delve into the advantages of incorporating progressive flushing into stator and rotor laminate design.

Enhanced Precision

Progressive flushing ensures that each lamination is precisely aligned and securely fastened. It eliminates any deviations that could negatively impact motor performance.

Reduced Energy Losses

Tighter, more secure connections between laminations minimize energy losses through eddy currents and other inefficiencies.

Improved Reliability

Motors designed with progressive flushing have high reliability and durability, making them ideal for critical applications.

Extended Lifespan

The enhanced quality and reduced wear and tear on components result in motors with a longer lifespan. Which reduces maintenance costs.


With the internationalization of the manufacturing industry, improving the specialization of mold products is an inevitable trend in the development of the mold manufacturing industry. Especially today with the rapid development of modern stamping technology. Modern stamping technology for motor stator and rotor core parts will be widely used.


How can progressive flushing benefit stator and rotor lamination design?

Progressive flushing enhances precision, reduces energy losses, improves reliability, and extends the lifespan of motors, making it a crucial element in motor performance optimization.

What is the role of progressive punching riveting machines in motor stator and rotor production?

Progressive punching riveting machines are essential for securely fastening rotor laminations during the manufacturing process. They automate the punching and riveting operations, ensuring consistent quality and reliable assembly.

How can I determine if progressive stamping is the right choice for my motor production needs?

Evaluating factors like production volume required precision, and custom design requirements can help determine if progressive stamping is the optimal choice for your specific motor production needs. Consulting with a progressive stamping expert can also provide valuable insights.

What is the difference between progressive stamping and rotary slotting?

Progressive stamping is a process in which an electrical steel strip is incrementally fed through a series of stations, each equipped with different dies and punches. These stations perform various cutting, bending, and shaping operations in a sequential manner, allowing for the efficient production of complex metal components with high precision.

In contrast, single slot notching automatic continuous feeding and punching from coil material on high-speed punch presses. All of our CNC single-notching presses have a high-precision positioning system and index.

Unlike progressive stamping, which is more suitable for the mass production of intricate parts, rotary slotting is suitable for the large punching sheet and is often used in applications such as creating slots in motor stator rotors.

The choice between these techniques depends on the specific requirements of the manufacturing process and the complexity of the parts being produced.

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