Moving Coil: Stroke Length ±1-100 mm, Max Current 0.1-10 A

Q: What is the difference between moving coil and moving magnet designs?

Moving coil designs have coils that move within stationary magnetic fields, offering better heat dissipation and higher acceleration. Moving magnet designs have magnets that move with stationary coils, providing simpler wiring and higher force density in some configurations.

Q: How do I calculate the force output of a moving coil?

Force = BL × I, where B is magnetic flux density (Tesla), L is conductor length in magnetic field (meters), and I is current (Amperes). The BL product is typically specified by manufacturers as the force constant.

Component Specifications

Definition

A moving coil is a precision electromechanical transducer consisting of a wound coil assembly suspended within a permanent magnet's magnetic field. When electrical current flows through the coil, it generates a Lorentz force perpendicular to both the current direction and magnetic field lines, producing linear or rotational motion proportional to the applied current. This component forms the core mechanism in various precision instruments and actuators where controlled motion is required.

Working Principle

The working principle is based on Lorentz force law: F = I × (L × B), where current (I) flowing through conductors of length (L) in a magnetic field (B) produces mechanical force (F). The coil is wound on a lightweight former and suspended in an air gap with high magnetic flux density. Current direction determines motion direction, while current magnitude controls force output.

Materials

Copper magnet wire (typically 0.05-0.5mm diameter, polyurethane or polyimide insulation), aluminum or titanium former, neodymium or samarium-cobalt permanent magnets, soft iron magnetic circuit, epoxy encapsulation, stainless steel suspension system.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Inductance	0.1-10 mH
Resistance	2-200 Ω
Max Current	0.1-10 A
Stroke Length	±1-100 mm
Force Constant	1-50 N/A
Resonant Frequency	10-1000 Hz
Operating Temperature	-40°C to +120°C

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 60034, ISO 1940, DIN 42950

Parent Products

This component is used in the following industrial products

Moving coil mechanism

A precision electromechanical component that converts electrical current into rotational motion through electromagnetic interaction.

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Engineering Analysis

Risks & Mitigation

Overheating from excessive current
Mechanical resonance at certain frequencies
Demagnetization from high temperatures
Wire fatigue from cyclic motion
Magnetic field interference with nearby components

FMEA Triads

Trigger: Excessive current density
Failure: Insulation breakdown and short circuit
Mitigation: Implement current limiting circuits and thermal monitoring

Trigger: Mechanical fatigue at suspension points
Failure: Reduced positioning accuracy and eventual breakage
Mitigation: Use fatigue-resistant materials and design with safety factors >3

Trigger: Magnetic field degradation
Failure: Reduced force output and nonlinear response
Mitigation: Select high-coercivity magnets and maintain operating temperature limits

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Position repeatability ±0.1% of stroke, force linearity ±1% of rated value, thermal drift <0.01%/°C

Test Method

IEC 60034-1 for electrical measurements, ISO 1940 for balancing, manufacturer-specific protocols for force constant verification

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

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Moving Coil

1 company lists this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Blue Jay

Chongqing, CN

Also makes: Current Transformer, Protection Relay, Dehumidifier and 7 more

Listed on the company's own website · profile compiled by CNFX from public sources

Listed there as: “CP-C Panel Meter Moving Coil”
View source page ↗ cqbluejay.com · checked 2026-08-27

View profile Send enquiry

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

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between moving coil and moving magnet designs?