High-precision electro-hydraulic and servo-driven shaping architectures deployed across modern European stator workshops. Fully customizable tooling adapted to Kragujevac industrial line standards.
An authoritative technical reference on cold plastic deformation of copper and aluminium stator windings, ensuring optimal slot fill factors, air-gap preservation, and corona-free dielectric integrity.
In three-phase asynchronous electric motors, permanent magnet synchronous motors (PMSM), and brushless DC (BLDC) units, the stator coil forming process is the defining manufacturing juncture between winding insertion and final impregnation. After magnet wire bundles are inserted into the insulated stator core slots along with slot wedges, the end-turns (winding overhangs) protrude axially in an irregular, flared geometry. Without precise intermediate and final forming, these coil heads exceed outer boundary limits, invade the internal rotor bore, and risk dielectric breakdown through friction, enamel cracking, or excessive mechanical tension.
Precision stator production lines typically divide the forming sequence into two specialized phases to protect conductor enamel insulation from excessive localized shear stresses:
Immediately follows coil and wedge insertion. A radial expanding mandrel enters the internal stator bore while an axial die pushes the coil ends outwardly and slightly axially. This clears the central bore passage, ensuring that automated lacing needles and guide fingers can oscillate freely through the stator core without snagging copper wires.
With end-turns mechanically pre-aligned, the stator is bound with polyester or synthetic cord by single or double-side lacing machines. The cord secures phase-to-phase insulation paper and compacts the loose strands into a dense bundle, mitigating electromagnetic vibrations and acoustic noise under transient motor loads.
The laced stator undergoes heavy multi-directional calibration. Internal expansion segments prevent bore collapse, outer clamping jaws set the external diameter, and dual axial upper/lower headers compress the coil heads to designated height specifications within tight dimensional tolerances (±0.2 mm).
During final forming in our HF-W120H series, high pressures (ranging from 10 kN to 60 kN depending on core size and wire gauge) are applied against annealed copper or aluminium wire. In poorly engineered forming machinery, excessive friction causes micro-fissures in the polyamide-imide (PAI) or polyester-imide (PEI) enamel overcoat, resulting in insulation failure during surge voltage testing. Our machine tooling utilizes high-grade hardened Cr12MoV cold-work die steel vacuum-quenched to HRC 60-62, with mirror-polished surfaces and customized entrance lead-in radii. This ensures frictionless progressive displacement where individual wires slide against each other without pinching or stripping the insulating coating.
Aligning high-precision Chinese automation equipment with the technical standards, supply chain dynamics, and electric powertrain modernization programs across Kragujevac, Šumadija.
Kragujevac has historically stood as the mechanical engineering and manufacturing capital of Serbia. Historically recognized as the epicenter of automotive production (formerly Zastava Automobili), Kragujevac is undergoing an unprecedented modernization toward electric vehicle (EV) component manufacturing, advanced industrial pumping machinery, automation robotics, and specialized electrical drive systems. With the strategic transition of large-scale industrial complexes (such as the Stellantis production site in Kragujevac producing electric city vehicles) and the surrounding Tier-1 and Tier-2 automotive supplier network, the demand for precision automated motor equipment has intensified dramatically.
Kragujevac automotive suppliers fabricate electric power steering (EPS) motors, engine cooling fan assemblies, window lifters, and EV thermal management pumps. These compact BLDC and PMSM stators require ultra-compact coil overhangs to fit inside tight aluminium vehicle housings.
From municipal water facilities in Šumadija to high-pressure agricultural irrigation pumps across the Morava valley, Kragujevac motor builders manufacture heavy-duty IEC standard 2-pole and 4-pole induction stators requiring deep, crack-free forming of thick copper wire bundles.
Industrial fan, commercial refrigeration, and ceiling fan stator manufacturers in central Serbia leverage multi-station automated machinery to reduce labor intensity, stabilize daily output, and meet stringent European EcoDesign energy efficiency standards (IE3 and IE4).
The manufacturing sector in the Šumadija district is characterized by rapid digital integration, strict compliance with European Union technical standards, and an urgent push toward energy decarbonization:
Detailed mechanical, electrical, and operational parameter comparison for process planning engineers and procurement directors in Kragujevac.
| Engineering Specification | Hydraulic Forming (e.g., HF-W120H) | Full Servo Forming Architecture | Process Benefit for Kragujevac Plants |
|---|---|---|---|
| Driving Mechanism | Dual-cylinder hydraulic powerpack (1.5 kW - 4.0 kW) | Multi-axis AC Servo Motor with ball screw drive | Servo offers lower power consumption; Hydraulic delivers superior high-tonnage brute force. |
| Stroke Repeatability | ± 0.10 mm (via mechanical depth stops) | ± 0.02 mm (digital closed-loop resolver) | Ensures identical end-turn heights across 100,000+ motor batches for automated robot assembly. |
| Stator Outer Diameter Range | Φ30 mm – Φ260 mm (Tooling dependent) | Φ20 mm – Φ180 mm (High precision) | Accommodates everything from miniature EV sensors to heavy industrial IEC 132 stators. |
| Stator Stack Lamination Height | 10 mm – 250 mm | 10 mm – 160 mm | Wide mechanical flexibility accommodating variable lamination packet lengths. |
| Cycle Time per Unit | 8 – 14 seconds (Load – Form – Eject) | 5 – 9 seconds (High-speed indexed) | Hydraulic allows deep dwell for stress relief; Servo speeds high-volume automotive runs. |
| Core Control Architecture | Mitsubishi / Omron / Delta PLC + HMI | Siemens S7-1200 / Schneider PLC | Familiar maintenance architecture for local Serbian electrical automation engineers. |
| Forming Tooling Material | Cr12MoV vacuum heat-treated to HRC 60-62 | DC53 or SKD11 cryogenic treated HRC 62-64 | Extreme wear resistance against abrasive silicon steel core teeth and copper strands. |
| Safety & Compliance Standards | Optical light curtains, two-hand start, CE | Interlocked safety cage, Category 4 E-stop | Strict compliance with EU Machinery Directive 2006/42/EC and EN ISO 13849-1. |
Zunqi Intelligent Equipment Co., Ltd. (HONGFANG Automation) operates from Qishi Town, Dongguan — the world's most concentrated precision manufacturing and motor equipment hub. Over 17 years of dedicated engineering and international export trade, we have perfected the balance between high-grade component integration and cost-effective capital investment.
In-depth technical answers addressing power grid compatibility, customs clearance in Serbia, tooling changeovers, and electrical safety standards.
Submit your stator blueprints, lamination dimensions, target cycle times, or wire specifications. Our senior motor automation engineers will analyze your slot geometry and generate a detailed tooling proposal within 9 hours.
