Structured Manufacturing Data (2026)

Feedback Sensor (e.g., LVDT)

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Feedback Sensor (e.g., LVDT) used in the Machinery and Equipment Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Feedback Sensor (e.g., LVDT) is characterized by the integration of Movable Core and Coil Assembly. In industrial production environments, manufacturers listed on CNFX commonly emphasize Ferromagnetic Core (e.g., Nickel-Iron alloy) construction to support stable, high-cycle operation across diverse manufacturing scenarios.

A sensor that provides real-time position feedback for servo control valve spools.

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Product Specifications

Technical details and manufacturing context for Feedback Sensor (e.g., LVDT)

Definition
A feedback sensor, such as a Linear Variable Differential Transformer (LVDT), is a critical component within a servo control valve. It continuously measures the precise linear displacement of the valve's spool or actuator. This position data is fed back to the valve's electronic controller, enabling closed-loop control to achieve accurate flow regulation, pressure control, or force application based on the input command signal.
Working Principle
An LVDT-type feedback sensor operates on the principle of electromagnetic induction. It consists of a primary coil energized with an AC signal and two secondary coils wound symmetrically on a cylindrical former. A movable ferromagnetic core, attached to the valve spool, moves within the coil assembly. The core's position changes the mutual inductance between the primary and secondary coils, producing differential output voltages from the secondaries. The phase and amplitude of this differential AC voltage are proportional to the direction and magnitude of the core's displacement, providing a precise, contactless measurement of spool position.
Common Materials
Ferromagnetic Core (e.g., Nickel-Iron alloy), Copper Windings, Epoxy Potting Compound, Stainless Steel Housing
Technical Parameters
  • Measuring range (stroke) of the sensor, defining the total linear displacement it can accurately detect. (mm) Per Request
Components / BOM
  • Movable Core Part
    Ferromagnetic element attached to the valve spool; its displacement modulates the magnetic field.
    Material: Nickel-Iron alloy
  • Coil Assembly
    Contains the primary excitation coil and secondary output coils wound on a bobbin.
    Material: Copper wire, epoxy bobbin
  • Housing Part
    Protects internal components from fluid ingress, mechanical damage, and electromagnetic interference.
    Material: Stainless steel
  • Electrical Connector Part
    Provides interface for excitation input and signal output cables.
    Material: Thermoplastic, brass contacts

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Feedback Sensor (e.g., LVDT).

LVDT position feedback sensor for servo valves real-time valve spool position sensor industrial feedback sensor for machinery control ferromagnetic core LVDT sensor manufacturing stainless steel housing feedback sensor BOM

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Servo Control Valve
View system integration details

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: 0 to 5000 psi
linearity: ±0.25% of full range
vibration: Up to 20g RMS
temperature: -40°C to +125°C
response time: <1 ms
Media Compatibility
✓ Hydraulic oil (ISO VG 32-68) ✓ Water-glycol fluids ✓ Phosphate ester fluids
Unsuitable: High-concentration abrasive slurries with >5% solids by weight
Sizing Data Required
  • Spool stroke length (mm or inches)
  • Required resolution/accuracy (% of full scale)
  • Operating frequency/response time requirement (Hz)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Signal Drift or Instability
Cause: Wear or contamination of the LVDT core and coil assembly, often due to ingress of metallic particles, moisture, or lubricants, leading to changes in inductance and output signal.
Mechanical Binding or Sticking
Cause: Misalignment, physical damage to the core or bore, or buildup of debris/contaminants preventing smooth linear motion, often exacerbated by excessive vibration or improper installation.
Maintenance Indicators
  • Erratic or fluctuating output readings on the monitoring system, inconsistent with process changes.
  • Audible scraping or grinding noise from the sensor housing during operation.
Engineering Tips
  • Ensure proper environmental sealing and use clean, dry instrument air purges to prevent contamination ingress, especially in harsh industrial settings.
  • Implement regular alignment checks and mounting integrity inspections to prevent mechanical stress and maintain precise core-to-coil positioning.

Compliance & Manufacturing Standards

Reference Standards
ISO 9001:2015 - Quality Management Systems IEC 61000-6-2 - Electromagnetic compatibility (EMC) for industrial environments ATEX Directive 2014/34/EU - Equipment for explosive atmospheres (if applicable)
Manufacturing Precision
  • Linearity: +/-0.25% of full scale output
  • Null Voltage: <0.1% of full scale output
Quality Inspection
  • Environmental Testing (Temperature, Humidity, Vibration per IEC 60068)
  • Electrical Performance Verification (Linearity, Hysteresis, Repeatability)

Factories Producing Feedback Sensor (e.g., LVDT)

Manufacturer profiles with relevant production capability in China

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Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

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 primary function of this feedback sensor in machinery manufacturing?

This LVDT sensor provides real-time, high-precision position feedback for servo control valve spools, enabling accurate motion control and automation in industrial machinery systems.

What materials ensure the durability of this sensor in industrial environments?

The sensor features a stainless steel housing for corrosion resistance, epoxy potting compound for environmental protection, nickel-iron alloy ferromagnetic core for precise sensing, and copper windings for reliable electrical performance.

How does this sensor integrate with servo control systems?

The sensor connects via its electrical connector to provide continuous position data to servo controllers, allowing for closed-loop control that maintains precise valve spool positioning despite load variations or system disturbances.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data basis: CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks for Machinery and Equipment Manufacturing.

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.

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