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Secondary Coils Component – Machinery and Equipment Manufacturing

Component Specifications

Definition

Secondary coils are wound wire components in Linear Variable Differential Transformer (LVDT) feedback devices that, when excited by a primary coil's alternating current, produce voltage signals corresponding to the position of a movable ferromagnetic core. These coils are precisely wound and positioned to create differential output for accurate displacement measurement in industrial machinery.

Working Principle

When an AC voltage excites the primary coil, it induces voltages in two secondary coils wound in opposite directions. The movable core's position changes the magnetic coupling between primary and secondary coils, creating differential voltage output proportional to displacement.

Materials

Copper magnet wire (typically 38-44 AWG), polyurethane or polyamide-imide insulation, epoxy encapsulation, bobbin material (PBT, nylon, or ceramic), ferromagnetic core (nickel-iron alloy or permalloy).

Technical Parameters

Linearity ±0.25% to ±0.5% of full range
Inductance 10-500 mH
Resistance 100-5000 ohms
Sensitivity 2-5 mV/V/mm
Frequency Range 400 Hz to 20 kHz
Operating Temperature -40°C to +125°C

Standards

ISO 9001, DIN EN 60529, IEC 60068

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Secondary Coils.

Parent Products

This component is used in the following industrial products

Feedback Device (e.g., LVDT)

A sensor component in servo valves that provides real-time position feedback of the valve spool to the control system.

View Product Details

Engineering Analysis

Risks & Mitigation

Electromagnetic interference
Insulation breakdown
Mechanical damage to windings
Temperature sensitivity
Signal drift over time

FMEA Triads

Trigger: Vibration-induced wire fatigue
Failure: Open circuit in coil winding
Mitigation: Use epoxy encapsulation, implement strain relief, and conduct vibration testing per MIL-STD-810

Trigger: Moisture ingress
Failure: Insulation breakdown and short circuit
Mitigation: Apply conformal coating, use IP67-rated housing, and specify proper storage conditions

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance

±0.1% of full scale output for precision applications

Test Method

IEEE 1193 standard for LVDT testing, including null voltage, phase shift, and linearity verification

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation

4/5

Manufacturing capability

4/5

Inspection readiness

5/5

Supplier transparency

3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the difference between primary and secondary coils in LVDT?

Primary coils receive excitation voltage to create magnetic field, while secondary coils generate output signals proportional to displacement through electromagnetic induction.

How do secondary coils achieve linear output?

Through precise winding geometry, symmetrical positioning, and differential connection that cancels common-mode errors while amplifying displacement-related signals.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

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.

Secondary Coils