Engineered for extreme thermal endurance, high dielectric strength, and mechanical flexibility. Browse our primary factory lines below.
An engineering breakdown of why Polyesterimide Coated Wires are replacing traditional polyurethane and polyester alternatives in heavy-duty inductive applications.
Polyesterimide (PEI) resin coatings represent a significant evolutionary leap in polymer chemistry for magnet wire. Combining the excellent thermal stability and mechanical toughness of the imide group with the flexibility and adhesion properties of the ester group, PEI-coated wires form a cross-linked network that maintains structural integrity under immense thermal stresses. When cured, this enamel creates a smooth, dense polymer layer that resists thermal softening up to 240°C during peak load spikes.
At Suzhou Daiming, our PEI formulations (often topped with a Polyamide-imide (PAI) overcoat for Class 200/220 applications) offer excellent resistance to chemical solvents, cooling refrigerants, and moisture ingress. This makes them the definitive choice for hermetic motor compressors, heavy-duty traction motors, and oil-immersed distribution transformers.
In modern industrial applications, selecting the appropriate wire insulation directly dictates the MTBF (Mean Time Between Failures) of electrical machines. Let's compare standard options:
Excellent thermal resistance (180°C - 220°C), superior resistance to heat shock, high mechanical strength, and superb chemical resistance to solvents and varnishes.
Thermal resistance limited to 130°C - 155°C. Features direct solderability but lacks the thermal shock resistance and abrasion endurance required for high-vibration heavy machinery.
Thermal resistance caps at 130°C - 155°C. Highly susceptible to hydrolysis and exhibits poor resistance to modern cooling oils and synthetic solvents.
Suzhou Daiming Electrical Materials Co., Ltd., is a leading manufacturer of high-quality enameled wires: enameled aluminum wires, enameled copper wires, and enameled copper-clad aluminum wires. We maintain a stable and high-volume output, ensuring consistent supply to meet global market demands. With strict quality control at every stage, from raw material inspection to final product testing, we uphold the highest industry standards, guaranteeing the durability and performance of our enameled wires.
Our engineering and manufacturing teams bring over ten years of industry experience to the table. We are proficient in the product characteristics, international standards (including IEC, NEMA, and JIS), and advanced process flows of enameled wire. We do not just sell products; we offer customized insulation designs tailored to your application's specific mechanical stress, thermal profiling, and environmental constraints.
Explore Technical Support
Providing industrial electrical solutions with zero-defect quality targets.
Each roll of enameled wire undergoes rigorous process and quality inspection to ensure stable, pinhole-free coating thickness and uniform insulation distribution.
Our enameled wires feature a uniform, dense paint film with strong adhesion, scratch resistance, and excellent flexibility for high-speed automatic winding.
We customize wire diameter specifications, spool capacities, and temperature classifications to match the precise engineering requirements of your hardware layouts.
With 30 state-of-the-art production lines, we secure the lead times of our global partners, insulating supply chains from market disruptions and price fluctuations.
Providing crucial copper and aluminum winding solutions for EV powertrains, high-efficiency solar inverters, and eco-friendly smart domestic appliances.
Daiming provides tailormade packaging, thermal properties, and copper-to-aluminum cross-sections for specialty projects.
Contact Engineer
As the automotive sector transitions from 400V to 800V architectures, electrical insulation materials must survive much higher electrical stresses. Under high-frequency, high-voltage square wave pulses from SiC (Silicon Carbide) inverters, standard enamels experience partial discharge, leading to rapid degradation and "corona damage."
Daiming's Research & Development Path: We are actively engineering nano-silica and metal oxide modified Polyesterimide resins. These nanocomposite coatings distribute space charges inside the insulation layer, mitigating local field concentration and dramatically improving corona resistance. This technology roadmap ensures that our next-generation magnet wires will reliably serve in high-altitude aerospace propulsion, fast-charging EV traction motors, and high-frequency inductors.
Additionally, our flat (rectangular) wire manufacturing utilizes advanced corner-radius control. By replacing round wire setups with rectangular profiles, we allow winding space factors to increase from 60% up to 85%, reducing copper losses and optimizing the heat dissipation of state-of-the-art stators.
How Daiming's Polyesterimide Coated Wires serve as the thermal and electrical backbone for major infrastructure, industrial, and consumer systems.
Powering high-capacity power distribution transformers, heavy industrial electric motors, and high-frequency reactors requiring Class 180 or Class 200 thermal safety margins.
Supplying precision winding components for air conditioner compressors, washing machine motor drives, and switch-mode power supplies (SMPS) demanding compact, long-term reliability.
Utilized in electromagnetic clutches, micro-actuators, precision solenoids, and high-resolution sensors operating in volatile, high-vibration manufacturing environments.
Custom insulated wire components and Continuously Transposed Conductors (CTC) for mega-scale wind power generators, hydropower turbine systems, and heavy-duty grid-tied substations.
Global supply chains require two main attributes: predictable quality and bulletproof logistics. Located in Suzhou's manufacturing cluster, Suzhou Daiming leverages a mature industrial ecosystem to source 99.99% pure copper and premium aluminum raw materials, insulating clients from unnecessary logistics delays.
Our Factory 4.0 model combines automated continuous extrusion and continuous draw-and-coat processes. Laser micrometer control loops monitor the outer wire diameter and concentricity in real-time, instantly adjusting the draw speed and coating dies. This level of automated process monitoring reduces the risk of thin insulation spots, securing consistent performance along the entire length of the spool.
Furthermore, our advanced thermal curing systems leverage catalyst combustion to incinerate solvent vapors, reusing the thermal energy to heat the curing ovens. This reduces energy consumption, aligning our output with global carbon reduction initiatives while keeping production costs highly competitive.
We align our manufacturing standards with the rigorous inspection procedures required by international procurement and engineering firms.
We subject our enameled wire to salt-water high-voltage pinhole tests, verifying that the polymer coating is free from microscopic cracks, bubbles, or physical inclusions.
Our springback testing measures the elastic deformation angle, ensuring that the wire remains tight and stable when wound into stators, without cracking the enamel layer.
All raw copper, aluminum, and insulation enamels undergo strict screening for hazardous substances. Our products are fully compliant with RoHS and REACH regulations.
Get direct answers to frequently asked engineering and sourcing questions about Polyesterimide magnet wire.
Discover our comprehensive collection of Enameled Aluminum, Enameled Copper, and CTC systems designed for high-performance installations.
