Featured Stator Winding, Inserting & Shaping Equipment
Engineered in our Dongguan manufacturing center and calibrated to the rigorous operational tolerances of heavy industrial motors. Explore our core lineup configured for high copper slot fill, vibration resistance, and long-life continuous production.
As the Democratic People's Republic of Korea's primary center for heavy chemicals, synthetic fibers, and mechanical engineering, the industrial base surrounding Hamhung and its port satellite Hungnam imposes distinctive, rigorous demands on electric motor manufacturing and rewinding lines.
Industrial machinery operating in the Hamhung basin—ranging from high-volume centrifugal slurry pumps at the Hungnam Fertilizer Complex to harsh-environment process agitators and spinning equipment within the 2.8 Vinalon Complex—relies on heavy three-phase asynchronous motors and high-torque specialized drives. In these continuous-duty production environments, premature winding insulation failure or uneven end-turn dimensional clearance frequently leads to catastrophic plant shutdowns. The integration of high-grade stator winding and shaping machinery from China is critical to transitioning from labor-intensive manual motor rewinding to automated, repeatable stator mass-production.
Furthermore, regional locomotive repair shops, mining equipment facilities in Kowon, and local municipal pumping stations face challenging power stability conditions. Motors must withstand voltage fluctuations and excessive harmonic heat generation. By utilizing automated stator winding and intermediate/final coil shaping machines, production plants achieve higher slot copper fill factors (often exceeding 78%), eliminating internal air pockets, reducing heat concentration, and extending operational life under demanding field conditions.
Chemical Plant Pumping Systems
Acid-resistant centrifugal and slurry pumps across Hungnam fertilizer facilities demand Class F and Class H insulated stators. Automated paper insertion and precise coil shaping eliminate wire abrasions that cause inter-turn short circuits in corrosive atmospheres.
Textile & Polymer Drives
Continuous-spinning machinery in synthetic vinalon synthesis plants requires compact high-torque induction and synchronous motors. Our multi-station winding equipment enables tight coil packaging without mechanical distortion.
Mining & Heavy Ventilation
Exhaust blowers, underground tunnel ventilators, and raw material conveyance drives in nearby mining zones operate non-stop. Coil shaping ensures end-turn height tolerances fit safely within compact cast-iron explosion-proof housings.
In conventional manual motor repair shops often observed across developing industrial sectors, winding coils are manually inserted into slots with wooden mallets and fiber drift pins. This primitive technique damages the enamel insulation layer (causing micro-cracking and partial discharge) and produces flared, non-uniform end turns that hit the motor end-shield or rub against the rotor shaft assembly.
To achieve modern industrial specifications (such as GB/IEC standard motor compliance), automated stator coil shaping is divided into two distinct technological phases:
| Process Phase | Mechanical Operation | Target Parameters | Impact on Motor Reliability |
|---|---|---|---|
| Intermediate Forming (Pre-Forming) | Hydraulic/pneumatic expansion shoes exert internal and axial pressure directly after coil inserting. | Internal diameter clearance: 0.5–1.5 mm wider than stator bore. Axial height within ±0.8 mm. | Eliminates Rotor Strike Prevents end windings from collapsing into the bore, creating ample pathway for automated needle lacing. |
| Double-Side Automated Lacing | Servo-driven twin needles loop diamond or chain stitch tension-controlled cord around end turns. | Pitch spacing: Uniform; Tie cord tension: 18–45 N depending on wire bundle cross-section. | Dynamic Rigidity Prevents electrodynamic displacement during high-inrush across-the-line starting conditions. |
| Final Forming (Calibration) | Dual-end multi-segment segment dies clamp outer diameter, inner bore diameter, and end height simultaneously. | Concentricity to lamination OD: ≤ 0.15 mm; End clearance to end-shield: ≥ 4.0 mm. | Optimal Heat Transfer Creates compact, uniform coil heads allowing unobstructed airflow from external cooling fans. |
By controlling every dimension hydraulically, Chinese stator shaping machines eliminate human error. The end turns become mechanically unified blocks that resist centrifugal stresses, severe thermal cycling, and chemical gas permeation.
Industrial planning across South Hamgyong places rising priority on energy conservation and modernization of old electric machinery. Several clear procurement trends have emerged:
Transition to Premium Efficiency
Older high-loss motors are systematically being phased out. Achieving higher efficiency levels (equivalent to IE3/IE4) demands maximum slot fill, tightly packed end windings, and reduced copper resistance—achievable only through automated winding tensioners and multi-stage forming dies.
Digital Tooling Changeovers
Instead of single-purpose machines, local manufacturing workshops seek modular CNC coil winders and forming presses. Modern machines must accommodate different core stack heights (from 20 mm up to 260 mm) and varied slot counts with straightforward modular tooling swaps.
Robust Electrical Tolerance
Given local power fluctuations, buyers specifically request electrical cabinets configured with wide-tolerance switching power supplies, independent surge protectors, and industrial PLC hardware (such as Delta, Mitsubishi, or Siemens) capable of smooth operation across volatile utility lines.
Direct Factory Capabilities • Dongguan Engineering
With 17 years of continuous international exporting, Zunqi Intelligent Equipment Co., Ltd. operates an integrated manufacturing plant in Qishi Town, Dongguan, delivering precision automation without the cost overhead of Western equipment.
Tailored Tooling to Stator Prints
Every forming die, inserting guide blade, and winding flyer is custom CNC-machined to your exact lamination drawings or physical iron core samples. We guarantee perfect geometric fit prior to shipment.
Turnkey Complete Production Line
From automatic green slot paper insertion to coil winding, wedge insertion, intermediate shaping, double-side lacing, and final hydraulic shaping, our machines are perfectly synchronized in cycle time.
Configurable Control Architecture
We configure electrical enclosures to your facility's standardized maintenance protocols, offering Mitsubishi, Siemens, Delta, or Inovance PLC systems, touchscreens, and Schneider switchgear.
Rigorous 100% Pre-Shipment Run
We do not dispatch untested machines. Your actual wire gauges and stator samples are run on our assembly floor, with high-definition video documentation and verification reports supplied for buyer sign-off.
Verified Factory Status • Comprehensive After-Sales Support
Registered Capital, physical plant, and export track record verified on-site. Backed by a full 1-year machine warranty and lifetime availability of replacement parts.
Frequently Asked Questions for Hamhung Procurement
Direct technical and commercial answers addressing voltage adaptations, wire material dynamics, custom tooling requirements, and logistics options for regional industrial buyers.
What is the minimum order quantity (MOQ) and lead time for stator shaping and winding machines? +
Our minimum order quantity is exactly 1 set for all standalone machines, including CNC stator winding machines, hydraulic coil shaping presses, and slot insulation inserters. For complete synchronized automated production lines (insulation, winding, inserting, shaping, and lacing), MOQ is 1 complete line.
Standard manufacturing lead time ranges between 20 and 35 working days, depending on the complexity of custom tooling dies fabricated to your stator lamination specifications.
How are machines adapted to regional three-phase and single-phase electrical power supplies? +
Industrial machinery destined for the Hamhung market can be built to run on standard 380V ±10% 50Hz (three-phase) or 220V ±10% 50Hz (single-phase) power grids. Because local grids can encounter transient voltage drops, our control cabinets are built with oversized transformers, regulated 24V DC switching power units, and line chokes to protect internal PLC processors and servo amplifiers from erratic supply conditions.
Can your coil winding and forming machinery handle both copper and aluminum magnet wire? +
Yes. Our winding systems feature electronic and magnetic closed-loop wire tensioners that can be adjusted specifically for the lower tensile yield strength of aluminum (such as 1370 grade) as well as conventional high-grade copper magnet wire. Forming dies are micro-polished and hard-chrome plated to eliminate any risk of scraping thinner enamel coatings frequently utilized on cost-optimized industrial designs.
What technical specifications must our engineering department supply for custom tooling fabrication? +
To fabricate the dedicated forming dies, wedge magazines, and winding flyers, we require:
1. Stator lamination drawing showing outer diameter (OD), inner bore diameter (ID), and slot geometry.
2. Core stack height range (minimum to maximum stack thickness in mm).
3. Winding diagram specifying number of slots, poles, coil grouping, wire diameter (mm), and turns per coil.
4. Slot insulation paper type (Nomex, DMD, green composite) and thickness.
Alternatively, sending 1 or 2 bare stator core samples to our Dongguan workshop allows our tooling engineers to build and test the dies with 100% geometric certainty.
How are machines packaged to withstand maritime humidity and long-distance transport? +
All precision surfaces, hardened forming blocks, and ground shafting are treated with multi-layer heavy-duty anti-corrosion grease and enveloped in vacuum-sealed VCI (Vapor Corrosion Inhibitor) plastic wrapping. The machine base is securely bolted directly to heavy steel channel skids inside export-grade, fumigation-free solid plywood cases, preventing dynamic shift or impact damage during border transit, rail handling, or sea freight.
What remote commissioning and warranty support is provided after equipment delivery? +
We provide a comprehensive 1-year warranty covering all mechanical drive systems, PLC controllers, and servo assemblies. Each machine ships with an exhaustive bilingual engineering handbook, complete electrical circuit schematics, PLC parameter backup drives, and complete step-by-step video training files showing setup, changeover, and maintenance procedures. Our engineering support desk responds to queries within ≤9 hours.
Optimize Your Stator Production Line Today
Connect directly with our senior tooling engineers in Dongguan. Submit your stator core drawings to obtain an engineering review, cycle-time simulation, and detailed pricing proposal within 9 hours.
