Selection Guide
Flat Wire Design Guide for Motors, Transformers and Power Components
A practical guide to specifying flat wire, rectangular wire and ribbon wire by material, geometry, corner radius, temper, surface and packaging.
Who This Guide Is For
Motor, transformer, coil, EV, electronics and power component engineers.
Quick Summary
Flat wire can improve packing density, contact area and thermal behavior, but it requires careful specification of geometry, corner radius, material, temper, surface, and winding process.
Define geometry beyond width and thickness
Width and thickness are only the beginning. Corner radius, edge condition, width/thickness ratio, straightness, and coil set can affect winding and insulation.
- Specify width, thickness, and tolerance
- Define corner radius or edge profile
- Check width/thickness ratio feasibility
- Confirm straightness and coil condition
Choose material by electrical and weight goals
Copper flat wire supports compact high-conductivity designs. Aluminum flat wire supports lightweight designs. CCA flat wire can be considered when weight and copper surface behavior are both relevant.
- Copper: high conductivity and compact current path
- Aluminum: lower weight but larger cross-section needed
- CCA: lightweight option with copper surface
- NCC or plated materials: harsh environment or surface-specific use
Validate bending and winding
Flat wire is sensitive to bend radius, edge cracking, surface damage, and insulation compatibility. Trial production is often essential before volume sourcing.
- Confirm minimum bend radius
- Check edge cracking after forming
- Validate insulation or downstream coating
- Ask for sample coils before production approval
FAQ
Why use flat wire instead of round wire?
Flat wire can improve packing density, contact area, heat transfer, and current density in compact electrical designs.
What is width/thickness ratio?
It is the ratio between the wide side and thin side of the conductor. High ratios require precise rolling and handling.
Can Raytron make CCA flat wire?
Yes. Raytron offers CCA flat wire as part of its broader flat wire and bimetal conductor capability.