Precision-engineered automatic coil and wedge inserting equipment built to handle copper and aluminium conductors, high slot fill ratios, and multi-speed stator lamination stacks without electrical insulation breakdown.
A heavy-duty, fully automatic solution dedicated to 3-phase industrial stators. Designed for simultaneous insertion of pre-wound copper/aluminium wire bundles and slot closure wedges into stator slots, reducing manual contact, eliminating crossing turns, and preserving wire insulation integrity.
Optimized for single-phase compressor, fan, and washing machine stators requiring complex main and auxiliary (start/run) phase configurations. Features precise programmable stepping, variable wedge length cutting, and ultra-smooth inserting pushers preventing wire scratch defects.
A fully interlinked turnkey production solution linking the stator paper insulation machine, vertical coil winding machine, automatic coil & wedge inserting machine, mid-forming press, dual-sided coil lacing machine, and end-of-line electrical hipot/surge tester.
A deep dive into the engineering mechanics, slot-fill limitations, wedge material behaviors, and cycle-time calculations motor procurement managers analyze worldwide.
The fundamental engineering challenge during stator assembly is inserting hundreds of fine or heavy-gauge copper turns into semi-closed lamination slots without breaking the insulating enamel coating. Ningbo Nakro Intelligent Equipment Co., Ltd. solves this through dual-servo mechanical synchronization. The stator coil inserting machine utilizes a precision array of vertical guide blades (fingers) that match the stator inner bore and slot pitch.
As the push finger servo ascends, the pre-wound coil bundles are smoothly guided up through the slot openings. Concurrently, an integrated wedge feeding unit uncoils DMD or Nomex insulation paper, creases it into an arch or box profile, cuts it to exact stack height + margin length, and drives it directly behind the wire pushers. This ensures the coil is seated and mechanically locked into the slot in a singular, continuous mechanical stroke.
With the aggressive shift toward Premium Efficiency (IE3, IE4, and IE5) induction motors, stator slot copper fill factor requirements have climbed from 68%–72% up to 78%–84%. At these densities, friction between overlapping magnet wires increases non-linearly, causing wire crowding, slot mouth jamming, or dielectric puncturing.
Ningbo Nakro overcomes this friction barrier through hard-chromed, micro-polished tungsten carbide and Cr12MoV tooling, specialized blade wedge angle geometry, and real-time servo torque feedback. If copper resistance spikes during the insertion stroke, the intelligent PLC system pauses stroke velocity within milliseconds to protect wire bundles from necking or structural strain.
Need custom slot fill simulation or tooling drawings for your stator core?
Get CatalogHow international motor builders are transforming capital equipment procurement to meet green energy regulations, e-mobility demands, and autonomous plant standards.
Stringent carbon neutrality and energy efficiency mandates compel procurement managers to select inserting machines capable of dense multi-wire parallel bundle insertion without copper deformation.
Motor makers no longer procure dedicated single-model equipment. The future lies in rapid tooling changover systems allowing the same inserting platform to process multiple center heights in minutes.
To hedge fluctuating global copper prices, buyers seek machines engineered with interchangeable wedge profiles that seamlessly handle both high-tensile copper and ductile aluminium enamelled conductors.
Modern machine purchase specifications demand inline force-displacement monitoring, automated optical inspection of inserted slot wedges, and OPC-UA data communication for plant-wide MES integration.
From hydraulic-assisted mechanics to fully digital, servo-driven, multi-axis smart inserting machines.
Elimination of legacy hydraulic pushing cylinders in favor of dynamic ball screw servo drives. This delivers repeatable micron-level positioning, eliminates hydraulic oil contamination, reduces factory energy draw by over 35%, and dramatically cuts maintenance downtime.
Next-generation machines automatically read stator lamination stack heights via precision laser displacement sensors, automatically adjusting wedge feeding lengths and stroke profiles on-the-fly to eliminate human operator error across variable manufacturing batches.
Application of advanced Physical Vapor Deposition (PVD) and DLC (Diamond-Like Carbon) coatings on inserting blades and pushers, reducing dynamic coefficient of friction by 60% and enabling reliable insertion of fragile high-temperature grade Class H and Class N wire types.
Your trusted, verified one-stop manufacturing and equipment partner for electric motor stator and armature production.
Founded in 2010 in Ningbo, Zhejiang, Ningbo Nakro Intelligent Equipment Co., Ltd. is a specialized high-tech machinery manufacturer focused on the design, engineering, and global commissioning of automatic stator and armature production equipment. Operating from our modern manufacturing facility of over 30,000 square meters, our multidisciplinary team of mechanical, electrical, and tooling engineers has successfully delivered motor production systems to more than 50 countries across Southeast Asia, Eastern Europe, South America, the Middle East, and beyond.
What truly sets Ningbo Nakro apart is our true one-stop industrial capability: beyond manufacturing state-of-the-art standalone stator coil inserting machines and continuous automated production lines, we supply the complete matching component ecosystem — including commutators, ball bearings, carbon brushes, insulation paper rolls, precision rotor shafts, permanent magnets, and motor housings. This vertical integration allows our engineering team to take absolute, single-source responsibility from initial 2D/3D stator slot drawing review to successful FAT (Factory Acceptance Test) and trial motor batch run-offs.
How Ningbo Nakro delivers zero-defect stator coil insertion tooling tailored to your slot geometry.
Detailed analysis of lamination drawing, slot fill ratio, and enamel insulation grades.
CNC EDM machining of mirror-finish guide blades and pushers with micro-radius contours.
Servo kinematics pairing push finger velocities with wedge feeder advancement.
Trial run using buyer's authentic stator laminations, wire spools, and wedge rolls.
On-site installation, line balancing, electrical testing, and operator certification.
| Company Name | Ningbo Nakro Intelligent Equipment Co., Ltd. |
|---|---|
| Business Type | Direct Manufacturer, Custom Machinery Builder |
| Year Established | 2010 |
| Total Employees | 101 – 200 skilled engineers & technicians |
| Factory Facility | 30,000 – 50,000 m² owned production workshops |
| Annual Revenue | US$10 Million – US$50 Million |
| Core Core Export Markets | Southeast Asia, Eastern Europe, South America, Middle East, Western Europe |
| Engineering Services | OEM, Custom Tooling Fabrication, Turnkey Line Integration |
| Payment Terms | T/T, L/C |
| Delivery Terms | FOB Ningbo/Shanghai, CFR, CIF |
| Accepted Currencies | USD, EUR, CNY |
| Direct Inquiry Contact | [email protected] |
Choose a dedicated partner backed by over 13 years of overseas machine exporting experience.
Comprehensive technical answers to the most common questions raised by electrical motor engineers and procurement specialists.
Send your stator core drawings, slot fill targets, and volume goals to Ningbo Nakro Intelligent Equipment Co., Ltd. for an immediate engineering assessment and quotation.
[email protected]