When it comes to reactor assembly, are you still relying on manual stacking, sheet shakers, or automated lamination insertion machines? The challenges are well known: low throughput, high material loss, and inflated labor hours. But what if you could produce silicon steel laminations directly to your exact target dimensions and stack thickness right during production—completely eliminating the insertion stage and moving straight to downstream assembly? It is not just possible; it is already here. Jiangyin Centersky Electrical appliance Co., Ltd. has developed a proprietary interlocking lamination technology for silicon steel sheets. Backed by eight years of rigorous, large-scale commercial validation, this innovation is in stable, high-volume production across dozens of electrical equipment manufacturers nationwide for low-voltage non-oriented silicon steel reactors. Delivering performance far superior to conventional methods alongside substantial cost reduction and efficiency gains, our solution has earned unanimous acclaim from industry partners—establishing itself as a benchmark manufacturing breakthrough in the low-voltage reactor core processing sector.
As a Jiangsu High-Tech Enterprise with over 50 years of deep specialization in silicon steel core manufacturing, Centersky initiated dedicated R&D into interlocking technology as early as 2018 to resolve chronic industry bottlenecks. Historically, the domestic production of low-voltage reactor cores relied heavily on legacy methods—slitting loose laminations first, followed by manual stacking using sheet shakers or insertion machines. This fragmented workflow and steep labor dependency have long posed an unresolved industry-wide challenge. Leveraging decades of manufacturing expertise alongside the R&D capabilities of the Wuxi High-Permeability Low-Loss Silicon Steel Sheet Engineering Technology Research Center, Centersky went through hundreds of process iterations and field trials, ultimately unveiling this game-changing integrated interlocking manufacturing solution.
This novel process completely breaks away from the industry’s conventional practice of supplying only loose cut laminations. Driven by high-precision custom tooling tailored to each customer’s specific design requirements, discrete sheets or EI laminations are stamped in a single pass, synchronously producing complete, ready-to-use core assemblies that strictly conform to specified dimensions, apertures, and stack thicknesses.
Downstream manufacturers no longer need dedicated machinery—such as sheet shakers or lamination insertion machines—nor do they need to deploy manual labor for secondary stacking. Instead, the finished cores can be directly fed into final reactor assembly, fundamentally restructuring the manufacturing and delivery pipeline for low-voltage reactor cores.
Through eight years of continuous optimization in commercial applications, the core advantages of this technology have been thoroughly proven: production efficiency has surged by more than 200% compared to conventional methods; dimensional tolerances are strictly maintained at the micron level; and the cut edges of the silicon steel laminations are virtually burr-free, eliminating the risk of localized core short circuits. Furthermore, batch-to-batch electromagnetic consistency across identical specifications has reached top-tier industry standards. Simultaneously, this innovative process slashes material loss from the traditional 5%–8% range down to under 1%, directly cuts downstream core assembly labor costs by over 30%, and delivers a qualitative leap in overall supply-chain productivity.
Previously, each line required at least three skilled technicians just for core stacking,’ shared a Zhejiang partner collaborating with Centersky for over 10 years. Adopting their ready-to-use interlocked cores allowed us to eliminate that stage entirely—saving hundreds of thousands in annual labor costs while boosting our first-pass yield from 92% to over 99%.A production head at a prominent Jiangsu low-voltage electrical enterprise voiced equal praise. Today, this solution powers key electrical equipment clusters across China, including the Yangtze River Delta and Pearl River Delta regions, while also reaching Europe and Southeast Asia through downstream OEM exports. Across millions of cores delivered to date, zero batch defects have been reported. According to Centersky management, eight years of field-tested reliability serves as the definitive proof of their technology. Looking ahead, Centersky will continue refining its interlocking solutions, expanding integration into mission-critical applications like clean energy and rail transit, and delivering superior core components that empower higher energy efficiency across the broader power grid landscape.