Slinky Stator: The Impact Of Manufacturing Process On The Magnetic Properties

The world of stator manufacturing is evolving, with the emergence of innovative designs such as the slinky stator capturing the attention of industries relying on efficient electromagnetic systems.

In this blog post, we delve into the crucial aspect of how the manufacturing process significantly influences the magnetic properties of slinky stators. Understanding these dynamics is essential for engineers, manufacturers, and enthusiasts seeking insights into the heart of electromagnetic technology.

Understanding Magnetic Properties in Stators

motor stator core laminations

At the heart of every stator’s functionality lies a complex interplay of magnetic properties, and understanding these nuances is crucial for engineers and enthusiasts alike. Magnetic properties such as permeability, saturation, and hysteresis play pivotal roles in determining the efficiency and reliability of a stator.

Permeability dictates how easily a material can be magnetized, saturation refers to the point at which a material reaches its magnetic limit, and hysteresis accounts for the energy loss during magnetization and demagnetization cycles. These properties collectively influence the magnetic flux, the driving force behind energy transfer in stators.

A nuanced comprehension of these magnetic dynamics is essential for optimizing the design and manufacturing processes, ensuring that stators, especially innovative designs like the slinky stator, perform at their peak across various applications in the realm of electromagnetic technology.

The Slinky Stator Concept

The slinky stator concept introduces a groundbreaking method that redefines traditional stator manufacturing.

By punching a stacked array of lengthy sheet steel bands, this innovative approach crafts strip laminations with distinct tooth portions and core back portions. What sets this method apart is the subsequent spiraling and integration of these laminations into a helical pattern, creating the iconic “Slinky” configuration.

Beyond its distinctive design, this process addresses a critical concern in manufacturing—material waste. In contrast to conventional square-sheet punching methods, the helical stamping employed in the Slinky Stator concept remarkably reduces material waste.

The efficiency is astounding, with iron waste estimated to be only 30 to 40% of the material typically required, making this approach not only revolutionary in design but also environmentally conscious in its resource utilization.

slinky stator concept

Impact of Manufacturing Processes on Magnetic Properties

The manufacturing of a slinky stator core is the result of a sequence of different processes: straightening, punching, and rolling manufacturing processes lead to a degradation of the magnetic properties. However, it is really difficult from the state of art to classify them a priori from the most influential to the least. 

In order to determine the most influential processes, it is necessary the evaluate quantitatively the impact of impact of each process. A campaign of magnetic characterization is carried out on FeSi 1.3% specimens extracted after each process on the manufacturing line of a slinky stator. Samples have different shapes, so different characterization methods were used to determine the normal curves and total losses. 

Results show that the dispersion in raw material is quite important and depends on the level of induction. Straightening and training processes deteriorate the magnetic material properties and dispersion after both processes is higher than the raw material one.

The effect of rolling and cutting is the most harmful compared to the other manufacturing processes, while the compacting process shows a beneficial effect.

Motorneo Slinky Stator Manufacture Capabilities

Motorneo’s slinky stator manufacturing capabilities showcase a commitment to innovation and efficiency in the realm of electromechanical systems.

With our automatic line for “slinky” winding technology, we have pioneered a revolutionary approach to manufacturing slinky stators, catering to a broad range of specifications from 110 mm to 145 mm outside diameter and electrical steel thicknesses ranging from 1.0 mm down to 0.30 mm.

Leveraging a proprietary process, Motorneo excels in the manufacture of slinky stators, employing cutting-edge technologies to ensure precision and reliability.

The manufacturing process involves intricate steps, from the initial punching of stacked sheet steel bands to create strip laminations with tooth and core portions, to the unique spiraling and integration that gives birth to the iconic helical pattern.

What sets Motorneo apart is not only the revolutionary design but also the environmentally conscious approach to material utilization. The helical stamping employed significantly reduces material waste, demonstrating Motorneo’s dedication to sustainable practices.

helical stamping stator lamination


In conclusion, the journey through the impact of manufacturing processes on the magnetic properties of slinky stators unveils a realm where design intricacies meet functionality demands.

The choices made during manufacturing reverberate through the magnetic landscape, influencing the performance and applications of these dynamic components.

As we navigate this evolving field, it becomes clear that a nuanced understanding of manufacturing processes is paramount for those at the forefront of electromagnetic technology.


How is a Slinky Stator manufactured?

The manufacturing process involves punching stacked sheet steel bands to create strip laminations with tooth and core portions. These laminations are then spirally wound and integrated, forming the distinctive helical pattern.

What are the key advantages of the Slinky Stator design?

The slinky stator design minimizes material waste through helical stamping, reducing iron waste to only 30 to 40% of the material typically required. This not only enhances efficiency but also contributes to environmental sustainability.

What industries benefit most from Slinky Stator applications?

Slinky stators find applications in a diverse range of industries, including EVs, energy generation, and electromechanical systems. The design’s adaptability makes it suitable for various applications.

How does the helical design contribute to the performance of Slinky Stators?

The helical design enhances flexibility and adaptability, allowing slinky stators to excel in applications requiring dynamic movement. This design also contributes to the reduction of material waste during the manufacturing process.

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