Rectangular Magnet Wire

Rectangular Magnet Wire or

Rectangular Enamelled Wire

Rectangular enamelled wire is a magnet (winding) wire whose conductor has a rectangular cross-section and is coated with a high-temperature-resistant insulating enamel film. With its high slot fill factor, low DC resistance, excellent heat dissipation and low high-frequency loss, it is widely used in the windings of high-power, space-constrained electrical equipment such as traction motors for new energy vehicles, PV and energy-storage converters, high-power transformers and servo motors.

Why choose Us

Nearly a decade of experience in the development of enamelled wire

With nearly a decade of experience in the research, development and manufacture of enamelled wire, the company has mastered the core processes — drawing, enamelling and annealing — for Class 180 and Class 220 enamelled wire, and has established a solid technical advantage.

A complete set of test equipment to support both quality control and full performance verification

The company operates a complete set of test equipment — including breakdown-voltage testers, tensile testing machines and salt-water pinhole test apparatus — to support both routine quality control and full performance verification.

An Experienced Team

The project leader brings 11 years of management experience in the enamelled wire industry, ensuring smooth project execution, while the production team has full command of the core processes.

Specifications of Rectangular enamelled wire

Item	Parameters
导体成分 Conductor Material	Pure copper; copper and aluminium
基础绝缘层 Base Insulation	UEW、EI/AIW、AIW、PIW、SEIW
耐热等级 Thermal Class	180、200、220、240
等效圆线 Equivalent Round Wire	0.25~2.60mm
截面积 Cross-sectional Aarea	0.05~5.00mm²
宽厚比倍数 Width-to-thickness Ratio	1~10

Features

Process innovation

The product is coated through a dual-route process — felt application and die coating — which can be switched flexibly according to product specification. This high production flexibility shortens trial-production cycles and accelerates delivery.

high slot fill factor and Superior heat dissipation

Compared with a round-wire coil of the same dimensions, the near-square rectangular coil combines small corner radii with a high slot fill factor: DC resistance is reduced by 15–20%, current-carrying capacity increases accordingly, output power rises and resulting in superior heat dissipation.

Main performance advantages

Uniform film with low eccentricity, good adhesion and flexibility for hairpin bending, heat-shock resistance; resistance to solvents and refrigerants; high batch-to-batch consistency; smooth, burr-free surface.

Application

New energy industry

EV traction motors (hairpin windings); PV/ESS converters and reactors.

transformers and Motors

High-power dry-type and oil-immersed transformers; servo motors.

Emerging applications

Wireless-charging coils; wind-power and rail-traction windings.

FAQ

Q: Why rectangular?

A: A near-square coil cross-section leaves very small interstitial gaps between turns. The result is a superior heat-rejection path, a higher slot fill factor and, for the same slot, a lower DC resistance. Compared with a round-wire coil of identical dimensions, our rectangular construction reduces DC resistance by 15–20%. At the same voltage, the winding therefore carries more current, delivers more torque or power, and generates less heat — a direct gain in efficiency and thermal margin.

Q: What is the Specification range?

A: Conductor: pure copper, or copper and aluminium.

Insulation: UEW, SEIW, EIW, EI/AIW, AIW and PIW, in thermal classes 180 (H), 200 (N), 220 (R) and 240 (S). Self-bonding, corona-resistant and solderable variants are available on request.

Q: Manufacturing capability?

A: The company brings nearly a decade of experience in enamelled wire development and production, with proven mastery of the three core processes: drawing, enamelling and annealing, for Class 180 and Class 220 constructions. The latest rectangular series is produced on a tandem dual-furnace enamelling line configured for self-bonding flat wire. By optimising enamel viscosity, felt settings and the associated process window, the line delivers uniform film coverage and stable, repeatable output.

Q: Can rectangular magnet wire be manufactured to custom drawings?

A: Yes. Production lines accommodate tailored width-to-thickness ratios, specific corner geometries, customized insulation thickness grades, and non-standard spool packaging to meet precise coil design requirements.

As one of the leading rectangular magnet wire manufacturers and suppliers in China, we warmly welcome you to buy advanced rectangular magnet wire made in China here from our factory. All customized products are with high quality and competitive price. Contact us for quotation.