INDUSTRY COMPONENT

Secondary Coils

Secondary coils are electromagnetic components in LVDT feedback devices that generate output signals proportional to displacement.

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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.

secondary coil LVDT coil displacement sensor feedback device electromagnetic coil position measurement industrial sensor Secondary Coils Secondary Coils in Machinery and Equipment Manufacturing

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.

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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

Buyer Feedback

★★★★☆ 4.5 / 5.0 (31 reviews)

"Testing the Secondary Coils now; the technical reliability results are within 1% of the laboratory datasheet."

"Impressive build quality. Especially the technical reliability is very stable during long-term operation."

"As a professional in the Machinery and Equipment Manufacturing sector, I confirm this Secondary Coils meets all ISO standards."

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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.

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Seating Die Secondary Seal (O-ring/Gasket)