Impregnation & Insulation
SZD-376/63.5 Model Motor Stator Varnishing Machine
Continuous horizontal trickling and varnishing system providing uniform resin penetration and zero void pockets for high-voltage dielectric stators.
Within industrial manufacturing, electric vehicle traction drives, precision power tools, and high-efficiency appliance manufacturing, the motor stator represents the electro-magnetic core. High-throughput automated lines require precision assembly coupled with comprehensive intermediate and End-of-Line (EOL) testing setups to eliminate defect propagation before resin curing or final motor encapsulation.
Continuous horizontal trickling and varnishing system providing uniform resin penetration and zero void pockets for high-voltage dielectric stators.
Multi-station CNC winding array configured for uniform copper wire tensioning, preserving layer insulation integrity before electrical surge tests.
Engineered for power-tool armatures requiring extreme rotational symmetry, uniform slot filling, and precise hook index tension parameters.
Advanced servo-controlled mechanical twisting system designed to deliver repeatable lead alignment for high-integrity commutator fusing and resistance checks.
Delivers micro-ohmic contact consistency across segments via closed-loop constant current thermal fusing, preventing hot-spot degradation.
Synchronous insertion tooling that safeguards slot liners and magnet-wire enamels against scratches, ensuring compliance with partial discharge ratings.
Specialized inverter welding technology engineered for segment stators, providing high tensile joint stability and minimal electrical resistance variations.
High-precision resistance welding cell suitable for stator lead frames, internal grounding terminals, and heavy-gauge wire assemblies.
Modern stator electrical inspection relies on comprehensive multi-function automated test benches. Understanding test parameters prevents field recalls caused by high-voltage degradation or sub-surface insulation failures.
| Diagnostic Test Phase | Primary Detection Target | Industrial Standard Metric | Impact on EOL Motor Quality |
|---|---|---|---|
| Surge / Impulse Test | Inter-turn, layer-to-layer, and phase-to-phase micro-shorts | Waveform Area Difference (ΔS), Oscillation Zero-Cross (Area Err < 1%) | Prevents premature winding breakdown under high dV/dt inverter switching frequencies. |
| AC / DC Hipot (Dielectric) | Slot lamination-to-copper dielectric breakdown, creeping distance | Leakage current threshold (< 0.05 mA at 1.5–3.0 kV AC) | Ensures operator isolation safety and dielectric compliance under continuous thermal stress. |
| Insulation Resistance (IR) | Hygroscopic moisture contamination, slot liner micro-fractures | Megohmmeter resistance measurement (> 500 MΩ at 500V / 1000V DC) | Validates varnish baking, pre-treatment resin penetration, and storage stability. |
| DC Winding Resistance | Wire gauge variances, cold solder connections, winding turn errors | Four-wire Kelvin bridge balancing (Resistance balance deviation < 0.5%) | Directly prevents three-phase torque ripple, current unbalance, and excessive localized heat. |
| Partial Discharge (PDIV) | Sub-microscopic insulation voids and incipient corona breakdown | Inception/Extinction Voltage (PDIV / PDEV in pC ranges) | Mandatory standard for 800V SiC/GaN-driven electric vehicle stators to prevent premature failure. |
As the electrification sector transitions to wider-bandgap semiconductors (Silicon Carbide and Gallium Nitride) and high-density hairpin topologies, the criteria for selecting stator manufacturing and testing machines are shifting rapidly.
With inverter frequencies exceeding 20 kHz and bus voltages scaling to 800V in EV platforms, traditional hipot tests alone are insufficient. Forward-thinking procurement teams require integrated high-frequency impulse partial discharge testing to identify microscopic cavities in resin and slot paper before motors enter service.
Flat-wire hairpins require high-density laser or resistance welding of dozens of conductor crowns. Sourcing managers are shifting investment toward multiplexed Kelvin-connection matrix testing, capable of measuring 48 to 192 individual joint resistances within seconds down to sub-micro-ohm tolerances.
Testing machines are no longer standalone diagnostic silos. Procurement guidelines now specify open OPC-UA and MQTT communication protocols that tie surge waveform vectors directly into cloud MES ecosystems, enabling predictive scrap alerting and automatic wire-tension recalibration upstream.
Older high-pot test methods can induce progressive dielectric fatigue in marginal stators. Next-generation systems apply ultra-short nanosecond rise-time impulses combined with resonance decay curves, evaluating insulation health without eroding the dielectric breakdown ceiling.
High-mix motor lines demand rapid turnover. Modern procurement demands quick-change pneumatic contact nests with RFID parameter loading, enabling automated testing stations to swap from an induction motor stator to a segmented BLDC stator in under five minutes.
Sourcing strategies place greater emphasis on contact probe life expectancy, pneumatic reliability, and on-site calibration simplicity. Systems featuring automated pneumatic self-cleaning contacts and built-in standard calibration resistors deliver lower maintenance downtime across multi-shift operations.
Headquartered in the Shatianyang Development Zone of Sanmen, Zhejiang, Rilvo Automation has served as a technological pillar in automated motor winding, assembly, and testing equipment since 1998.
Unlike trading intermediaries, Rilvo controls 20,000 m² of finished modern workshops with an additional 30,000 m² under expansion. Housing over 150 dedicated machine tools, precision CNC machining centers, and comprehensive test laboratories, we ensure all components maintain structural and mechanical concentricity.
Led by our President and Chief Engineer—recognized with the prestigious National Knowledge-Worker Model award by the All-China Federation of Trade Unions—our team includes 36 senior research engineers holding 8 advanced academic titles, driving optical, mechanical, and software patents.
Operating under strict ISO9001 certified quality management protocols and China Compulsory Certification (3C), Rilvo holds 17 national invention and utility patents. We are officially recognized as a High and New Technology Enterprise of Zhejiang Province.
We eliminate commissioning risk. Every customized machine undergoes continuous trial testing using customer-supplied raw core laminations, copper magnet wire, and terminal assemblies. Detailed high-definition video acceptance and dimensional data sheets are provided prior to export dispatch.
Located just two hours from Ningbo Port, Rilvo handles international transactions under FOB, CFR, CIF, and EXW incoterms with full USD and EUR capabilities. Our client network spans Eastern Asia, Southeast Asia, South America, Eastern Europe, and the Middle East.
From individual standalone stator winding or varnishing systems to fully integrated, multi-station automated total assembly lines (including electrostatic powder spraying and trickle impregnation), our modular architecture allows seamless expansion as production volume scales.
Technical, logistical, and operational answers addressing the core questions raised by plant engineers and procurement managers prior to formal RFQ sign-off.
To establish accurate pneumatic clamping dimensions, coil winding clearances, and cycle-time calculations, our engineering team requires: lamination outer diameter (OD), inner diameter (ID), stack height, slot count, slot opening dimension, bare and insulated wire diameter, winding schematic diagram, and targeted output per 8-hour shift.
All core tooling fixtures, insertion blades, push fingers, and winding needles are processed on our in-house CNC wire-EDM and grinding machines. Critical contact surfaces utilize heat-treated tool steels (such as SKD11 or tungsten carbide alloys) to achieve high hardness ratings and minimal wear over millions of operating cycles.
Yes. Our equipment architecture is designed around open industrial control standards. We utilize Omron, Mitsubishi, or Siemens PLCs with dedicated I/O safety interlocking and communication boards, enabling continuous synchronization with automated surge, resistance, and hipot test fixtures across conveyor transport layouts.
Machines are crated inside standard fumigated export-grade sea freight wooden enclosures. Along with the equipment, we provide schematics, pneumatic diagrams, operational video instructions, and calibrated spare-parts lists. Our export engineers offer video-guided commissioning support, with on-site deployment available for full assembly line configurations.
For standard models such as our standalone winding, fusing, or trickling units, manufacturing lead times are typically 30 to 45 business days. Highly customized, multi-station automated insertion cells or complete lines involving specialized custom tooling and multi-parameter testing verification require approximately 60 to 90 days.
Our minimum order quantity (MOQ) is 1 set. We accommodate international trade via FOB Ningbo/Shanghai, CFR, CIF, and EXW terms. Payments are processed securely via Telegraphic Transfer (T/T) in either USD or EUR denominations, supported by audited supplier credentials.