Moving mass: Stroke Length 0.1-10 mm, Mass 0.5-50 grams

Component Specifications

Definition

In a Voice Coil Motor (VCM) actuator, the moving mass refers to the assembly of components (typically including the coil, bobbin, and attached payload) that moves linearly along the actuator's axis when subjected to the Lorentz force generated by the interaction between the coil's current and the permanent magnetic field. This mass is suspended by flexures or bearings and its motion is precisely controlled to achieve nanometer to micrometer-level positioning accuracy in applications like optical image stabilization, hard disk drive head positioning, and precision manufacturing equipment.

Working Principle

The moving mass operates on the Lorentz force principle: when an electric current flows through the coil (part of the moving mass) within a permanent magnetic field, it generates a force proportional to the current. This force causes the mass to accelerate linearly along the axis. Position feedback sensors (e.g., Hall effect sensors, optical encoders) measure displacement, enabling closed-loop control for precise positioning.

Materials

Coil: Copper or aluminum wire with polyimide or enamel insulation; Bobbin: Lightweight materials like aluminum alloy, titanium, or advanced polymers (e.g., PEEK) for stiffness and low mass; Flexures/Bearings: Stainless steel or beryllium copper for flexures, or ceramic balls in linear bearings; Adhesives: Epoxy or cyanoacrylate for component bonding.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Mass	0.5-50 grams
Stroke Length	0.1-10 mm
Force Constant	1-20 N/A
Resonant Frequency	50-500 Hz
Positioning Accuracy	±0.1-10 μm
Operating Temperature	-20°C to +80°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

ISO 1101, ISO 2768, DIN 7184

Parent Products

This component is used in the following industrial products

Voice Coil Motor (VCM) Actuator

A compact electromagnetic actuator that converts electrical signals into precise linear motion for optical stabilization.

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Engineering Analysis

Risks & Mitigation

Resonance at high frequencies causing instability
Thermal buildup in the coil leading to performance degradation or failure
Mechanical wear in bearings or fatigue in flexures over time
Misalignment with magnetic field reducing efficiency

FMEA Triads

Trigger: Overcurrent or overheating
Failure: Coil insulation breakdown or deformation
Mitigation: Implement thermal sensors and current limiting circuits; use high-temperature insulation materials.

Trigger: Mechanical shock or vibration
Failure: Flexure fracture or bearing damage
Mitigation: Design with safety factors; use dampening materials; conduct shock testing per standards.

Trigger: Contamination (dust, moisture)
Failure: Increased friction or electrical short
Mitigation: Apply seals or protective coatings; operate in controlled environments.

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Dimensional tolerances typically ±0.01 mm for critical features; positional accuracy within ±1% of stroke length

Test Method

Testing includes dynamic response analysis (frequency sweep), step response measurement, thermal cycling, and endurance testing under load per ISO 9283 for performance validation.

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 Moving mass

Manufacturer profiles associated with Moving mass.

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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 factors affect the performance of a VCM moving mass?

Key factors include mass (affects acceleration and resonant frequency), stiffness of flexures/bearings, coil resistance and inductance, thermal management, and alignment with the magnetic circuit.

How is the moving mass controlled in a VCM actuator?

It is controlled via closed-loop systems using feedback from position sensors (e.g., Hall sensors) and drive electronics that adjust current based on error signals to achieve precise motion profiles.

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.

Moving mass