AC Voice Coil Motor (VCM) for High Speed Actuation- Suzhou Retek Electric Technology Co., Ltd.

AC Voice Coil Motor: High Bandwidth, Short-Stroke Dynamics

The AC Voice Coil Motor (VCM) is a direct-drive, non-commutated linear or rotary motor used for short-stroke, high-frequency, and highly accurate positioning tasks.

The VCM principle is based on the Lorentz force: current through a coil interacting with a fixed magnetic field. Crucially, the VCM is characterized by Zero Hysteresis, Zero Cogging, and Near-Zero Friction (contactless operation). This results in an extremely high force-to-mass ratio for the moving coil assembly, providing the highest possible dynamic bandwidth for short strokes (typically less than 50mm), ideal for precision focus and fast-acting valves.

Introduction

Detailed Parameters and Performance Data

RETEK: Millisecond Response for Optics and Fluidics

Suzhou Retek Electric Technology Co., Ltd. provides VCMs for demanding applications in optical systems and micro-fluidics where response time must be in the low millisecond range. We optimize the coil geometry and magnet strength to maximize the Force Constant (Kf) while keeping the moving mass to an absolute minimum. The VCM is the industry standard for fast, repeatable, and high-resolution motion where rotary motors and screws are too slow or exhibit too much friction/stiction.

Applications

Advanced Technology Highlights

Ultra-Fast, Short-Stroke Applications for VCMs

Optical Lens Focusing/Stabilization: Actuators for rapid autofocus, zoom, and image stabilization in high-end cameras and telescopes. Challenge: High frequency and smooth movement.
Micro-Dispensing and Dosing Valves: Actuators for opening/closing micro-valves in pharmaceutical or fluidic systems (e.g., 10ms response time).
Vibration Cancelling/Active Damping: Motors used as high-bandwidth actuators in active vibration cancellation systems.
Atomic Force Microscopy (AFM): Positioning the probe in the Z-axis with sub-micron resolution.

Technical Specifications

Industrial & Commercial Usage

Technical Parameters (AC Voice Coil Motor)

Parameter	Range / Typical Value	Unit
Stroke Length	Typically $ < 50$	mm
Response Time	$ < 10$	ms (Step/Settle)
Cogging Force	Zero	Characteristic
Force Constant (Kf)	High (Varies by Model)	N/A
Position Feedback	External Sensor (e.g., Capacitive/Optical)	Type

Additional Information

Supplementary Details & Notes

Production & Customization Services

Manufacturing involves extremely precise coil winding and bonding. Final testing includes measuring the Force Constant (Kf) and the electrical time constant under dynamic load.

Custom Force Constant: Designing the coil geometry and magnet strength to match specific required force and power limits.
Integrated Flexure Guide: Providing the VCM mounted to a pre-tuned, high-stiffness flexure bearing system for guaranteed non-contact guidance.
Thermal Interface: Customizing the mounting interface for optimal thermal coupling to a heat sink or cooling plate.
Medical Grade VCMs: Customizing coil potting and external materials for compatibility with specific cleaning agents.

Service & Support

Technical Advantages and Core Design Features

Highest Dynamic Bandwidth: Achievable due to the extremely low moving mass (only the coil).
Zero Cogging/Hysteresis: Provides perfectly smooth, continuous force across the stroke and highly repeatable positioning.
Direct Drive: Force is generated directly on the moving component, eliminating mechanical parts, backlash, and friction.
Force Proportional to Current: The force output is linearly proportional to the input current, simplifying the servo control and calibration.
Silent Operation: Contactless operation results in virtually no acoustic noise.

Frequently Asked Questions

Common Inquiries Regarding VCMs

Q: Why are VCMs limited to short strokes?
A: To maintain the constant, uniform magnetic field required for linear force output, the fixed magnet assembly must be significantly longer than the coil's travel range, making long strokes expensive and impractical.

Q: How do VCMs achieve high precision?
A: They are typically coupled with an extremely high-resolution non-contact linear sensor (e.g., capacitive or optical encoder) and driven by a high-bandwidth current-mode amplifier, allowing for positional resolution into the sub-micron range.

Q: What is the benefit of the AC designation?
A: AC VCMs use a multi-phase winding structure similar to an AC servo, allowing for higher power density and better thermal management than single-phase DC VCMs, enabling continuous thrust for short-stroke cyclic applications.

Resources

Advanced Material Selection Guide

Coil Assembly: Ultra-fine gauge copper wire wound and potted using a high-thermal-conductivity epoxy for minimal mass and excellent heat transfer.

Magnet Assembly: Neodymium Iron Boron (NdFeB) magnet rings/slugs fixed into a precision-machined flux return path (yoke) to maximize magnetic field uniformity.

Suspension: Often utilizes highly flexible flexure bearings or air bearings to guide the coil without adding friction or stiction.

About Suzhou Retek Electric Technology Co., Ltd.

Unlike other motor suppliers, Retek engineering system prevents the selling of our motors and components by catalogue as every model is customized for our customers. The customers are assured that every component they receive from Retek is designed with their exact specifications in mind. Our total solutions are a combination of our innovation and a close working partnership with our customers and suppliers.

As China AC Voice Coil Motor (VCM) for High Speed Actuation Manufacturers and Wholesale AC Voice Coil Motor (VCM) for High Speed Actuation OEM/ODM Suppliers, Retek business consists of three platforms: Motors, Die-Casting and CNC manufacturing and wire harness. Retek products are widely supplied for residential fans, vents, boats, airplanes, medical facilities, laboratory facilities, trucks and other automotive machines.

Welcome to send us an RFQ, it is believed you will get the best cost-effective products and services here!

Customized Solutions

Quality Assurance

Global Export

Suzhou Retek Electric Technology Co., Ltd.

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