Stator Lamination Stacks Manufacturer

Here at Sino, we don’t just manufacture stator laminations; we engineer them with a precision and understanding that turns good motors into great ones.

Sino’s Stator Laminations Help You Slashing Energy Losses

We meticulously craft our stator laminations from thin, specialized sheets of electrical steel. Each sheet is electrically insulated from its neighbors. This construction effectively slices and dices the paths available for those eddy currents. The thinner the lamination, the more effectively we can choke off these losses.Of course, thinner laminations mean more sheets for a given stack height, which can increase manufacturing complexity and cost. There’s also the “stacking factor” – the ratio of actual magnetic material to the total volume (including insulation). At Sino, we help you navigate this balance. We might advise a customer developing a high-efficiency industrial pump motor that 0.35mm laminations offer the sweet spot for their target IE4 efficiency rating, considering both performance and cost-effectiveness.

Material Matters: The Steel at the Heart of Performance

The steel we employ for your stator laminations is a highly specialized material known as electrical steel, often a silicon-iron alloy, and its selection is a cornerstone of our design and manufacturing philosophy at Sino.

Choosing the right grade is paramount because different steels bring different magnetic personalities and loss characteristics to the table.

The Silicon Secret

Silicon (typically we see it in amounts up to around 3.5% for many motor grades) significantly boosts the steel’s electrical resistivity. It also plays a role in taming another form of energy loss called hysteresis loss, which is related to the energy it takes to re-magnetize the core material with each cycle of the alternating current. However, there’s a trade-off: pile in too much silicon, and the steel can become quite brittle, making it a headache to punch cleanly during manufacturing. At Sino, we source materials that hit that ideal blend of electrical performance and mechanical workability.

Grain Game

For most stator laminations in rotating machinery, we’ll recommend non-oriented electrical steels. Non-oriented steels offer good magnetic properties in all directions within the plane of the lamination. (Grain-oriented steels, which are magnetically supercharged in one direction, are more the domain of transformer cores where the flux path is more predictable).

Purity and Pampering

Impurities within the steel or internal stresses leftover from the steel mill’s rolling process or, crucially, from the punching process itself, can act like magnetic roadblocks, degrading performance. A post-punching annealing step relieves those stresses, “healing” the material and restoring its optimal magnetic mojo. Sino’s process includes meticulous attention to annealing when the material and application demand it.

To give you a clearer picture, here’s a simplified look at some common electrical steel considerations Sino manages:

Material Grade Aspect	Sino’s Approach & Considerations	Typical Scenarios
Silicon Content	Selected based on target efficiency, frequency, and cost. Higher Si for lower losses, balanced against punchability.	Low-Si for cost-sensitive, lower-freq motors; High-Si for high-efficiency designs.
Lamination Thickness	Optimized from 0.1mm to 0.65mm (or thicker for specific low-frequency scenarios). Thinner for high frequency and lower losses.	0.5mm/0.65mm for 50/60Hz general motors; 0.2mm/0.35mm for higher efficiency/frequency.
Coating Type (Insulation)	Offering various coatings (C3, C4, C5 per ASTM A976) for optimal insulation, punchability, and heat resistance.	C3 for general purpose; C5 for applications requiring stress-relief annealing.
Stress-Relief Annealing	Applied post-punching for sensitive materials or high-performance stacks to restore magnetic properties affected by work-hardening.	Crucial for high-permeability steels and where minimal core loss is paramount.
Purity & Sourcing	Sino partners with reputable steel mills, ensuring consistent quality and traceable material certifications.	All critical applications, especially aerospace, medical, and high-performance EV.

Our Stator Lamination Products

Sino’s Coating Capabilities

The interlaminar insulation is so critical. At Sino, we work with a range of industry-standard coatings, often classified by standards like ASTM A976. These include:

C3 (Organic): Often a varnish or enamel. Good for general-purpose applications, offering decent insulation and aiding punch-die life.
C5 (Inorganic): Typically phosphate-based, often with inorganic fillers. These are champs when it comes to handling higher temperatures and are generally required if the stator lamination stack needs to undergo stress-relief annealing after punching, as organic coatings would burn off.
Other Specialized Coatings: For unique scenarios, like extremely high frequencies or exposure to aggressive environments, we can source and process materials with tailored insulation.

Manufacturing Precision: Where Sino's Craftsmanship Truly Shines

Tooling

Dull or poorly designed tools create burrs which effectively increase the ‘electrical thickness’ of the lamination locally, boosting eddy current losses and reducing the stacking factor. At Sino, our rigorous tool maintenance schedules and investment in high-quality carbide tooling mean burr height is kept to an absolute minimum, often measured in mere microns.

Laser & Wire EDM

For prototypes, highly complex geometries, or small-batch runs where creating a dedicated stamping die isn’t economical, Sino also has capabilities with laser cutting or even wire EDM for ultimate precision. While laser cutting can create a small heat-affected zone (HAZ) at the cut edge that might slightly alter local magnetic properties, it offers incredible flexibility. We often counsel clients on when this trade-off makes sense, for example, during the rapid prototyping of a novel motor design for a medical device.

Annealing

For many high-performance stator core laminations, a crucial step after punching is stress-relief annealing. Sino’s annealing processes are tightly controlled to ensure optimal results without damaging the vital interlaminar insulation (especially when using C5 or similar high-temperature coatings).

Sino is proficient in the key methods:

The precision Sino brings to every step – from material inspection to final stack measurement – ensures that the stator lamination stack you receive isn’t just a collection of steel sheets, but a highly engineered component ready to deliver peak performance.

Welding

Sino employs advanced welding techniques, including TIG and laser welding, with precise control to minimize these risks.

Interlocking (Cleating/Staking)

Sino has extensive experience in designing and producing interlocked stator lamination stacks.

Bonding

In some advanced or specialized scenarios, laminations can be bonded together using adhesives. This can offer excellent interlaminar insulation and mechanical damping but is often a more complex and costly process.

Through-Bolts or Clamping Plates

Sometimes, particularly for very large machines or certain repair scenarios, stacks are held together by bolts passing through holes in the laminations (which must be insulated) or by external clamping plates.

Design Geometry: Shaping the Flux for Peak Performance

Beyond the material, thickness, and insulation, the actual physical shape of each individual stator lamination is meticulously engineered. At Sino, we don’t just stamp out parts. We can work from your detailed drawings, or our experienced team can collaborate with your design engineers, offering insights into how lamination geometry choices might affect manufacturability or even suggest subtle tweaks based on our extensive experience that could enhance performance or reduce cost.

Sino: Your Partner for High-Performance Stator Laminations

When you boil it all down, creating a top-tier electric motor or generator demands excellence in every component. And as we’ve seen, the stator laminations are far more than just passive pieces of metal; they are active participants in the energy conversion process.

Choosing Sino for your stator core laminations and stator lamination stacks means you’re not just buying a part; you’re gaining a partner dedicated to:

Uncompromising Quality

From raw material verification to final dimensional checks, quality is woven into our DNA.

Deep Expertise

We understand the metallurgy, the electromagnetics, and the manufacturing intricacies.

Precision Manufacturing

Our investment in top-tier tooling, machinery, and processes translates directly into superior laminations for you.

Customization & Collaboration

Whether you have a fully detailed design or need guidance optimizing for a specific scenario, we're here to work with you.

Reliability & Consistency

We know you count on timely delivery of consistent, high-quality components to keep your production lines running.

Talk to Sino Today!

The efficiency, power density, and longevity of your electric machines are significantly influenced by the often-unseen stator laminations within. Don’t leave this critical component to chance. Talk to Sino today, and let’s power up your performance together.

Note: To speed up your project, you can label Lamination Stacks with details such as tolerance, material, surface finish, whether or not oxidized insulation is required, quantity, and more.

Let Sino's Lamination Stacks Empower Your Project!