Coil Former: Inner Diameter 3-45 mm, Outer Diameter 5-50 mm

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

Parameter	Typical range	Notes & selection driver
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

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

IEC 60085, UL 1446

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.

View Product Details

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

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1 mm on critical dimensions

Test Method

Dielectric withstand test per IEC 60243, dimensional inspection per ISO 2768

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Coil Former

Manufacturer profiles associated with Coil Former.

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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.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Coil Former