INDUSTRY COMPONENT

Coil Former

A coil former is a structural component that supports and insulates wire windings in electromagnetic devices like motors, transformers, and relays.

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Component Specifications

Definition
A coil former, also known as a bobbin, is a precision-engineered component designed to provide mechanical support, electrical insulation, and thermal management for wound wire coils in electromagnetic assemblies. It maintains precise winding geometry, prevents short circuits, and facilitates heat dissipation in devices such as moving coil assemblies, solenoids, and inductors.
Working Principle
The coil former acts as a non-conductive core around which conductive wire is wound to create an electromagnetic coil. It ensures consistent coil geometry, which is critical for maintaining inductance, magnetic field uniformity, and operational reliability. In a moving coil assembly, it supports the coil within a magnetic field, allowing controlled movement when current flows.
Materials
Typically made from thermoplastics (e.g., PBT, PET, nylon), thermosets (e.g., phenolic resins), or ceramics. Materials are selected for high dielectric strength, thermal stability (operating temperatures from -40°C to 150°C+), and mechanical rigidity.
Technical Parameters
  • Height 10-100 mm
  • Inner Diameter 3-45 mm
  • Outer Diameter 5-50 mm
  • Temperature Rating -40°C to 180°C
  • Dielectric Strength >10 kV/mm
  • Flammability Rating UL94 V-0
Standards
ISO 9001, IEC 60085, UL 1446

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Coil Former.

coil former bobbin electromagnetic coil winding support electrical insulation moving coil assembly transformer component motor part Coil Former in Electrical Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Moving Coil Assembly

Core electromagnetic actuator component that generates controlled vibration forces in electromagnetic vibration testing systems.

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Engineering Analysis

Risks & Mitigation
  • Electrical insulation failure due to material degradation
  • Mechanical deformation under thermal stress
  • Inconsistent winding leading to performance variability
FMEA Triads
Trigger: Material thermal degradation
Failure: Loss of insulation, leading to short circuits
Mitigation: Use high-temperature-rated materials and implement thermal management designs
Trigger: Improper winding tension
Failure: Coil deformation or wire damage
Mitigation: Automate winding processes with tension control and quality checks

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.1 mm on critical dimensions
Test Method
Dielectric withstand test per IEC 60243, dimensional inspection per ISO 2768

Buyer Feedback

★★★★☆ 4.8 / 5.0 (35 reviews)

"The Coil Former we sourced perfectly fits our Electrical Equipment Manufacturing production line requirements."

"Found 49+ suppliers for Coil Former on CNFX, but this spec remains the most cost-effective."

"The technical documentation for this Coil Former is very thorough, especially regarding technical reliability."

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A precision rotating shaft in transformer winding machines that holds and rotates the coil form during wire winding operations.

Frequently Asked Questions

What is the primary function of a coil former?

The primary function is to provide structural support and electrical insulation for wire windings, ensuring consistent coil geometry and preventing electrical shorts.

Can coil formers be used in high-temperature environments?

Yes, if made from high-temperature materials like PBT or ceramics, they can operate in environments up to 180°C or higher, depending on the specification.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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Coil Bobbin Coil Winding