With the continuous development of technology, voice coil motors (VRMs), thanks to their high-speed response and high-precision positioning capabilities, exhibit excellent performance in high-speed loading and unloading, visual focusing, micro-nano-level micro-motion positioning, high-frequency vibration, and vacuum conditions. In the medical field, VRMs are widely used in equipment such as ventilators, vibration isolation platforms, and micro-motion platforms to ensure precise control and high performance of medical devices. The application of VRMs in precision manufacturing and automation is becoming increasingly widespread, gradually making them an indispensable drive component.
What is a voice coil motor?
The term "voice coil" comes from loudspeakers. A loudspeaker contains a coil that, when energized, experiences a Lorentz force in a magnetic field, causing it to vibrate and produce sound. Voice coil motors operate on a similar principle.
A simple voice coil motor consists of a permanent magnet, a magnetic material, and a coil. The permanent magnet generates a constant magnetic field, and when current flows through the coil, the direction of the force on the coil can be determined according to the left-hand rule. For example, the direction of the current shown in the diagram below will cause the coil to experience a downward force.
(A typical cross-sectional view of a cylindrical voice coil motor)
According to F=B×I, the magnitude and direction of force can be adjusted and reversed by changing the magnitude and direction of the current. Voice coil motors do not drive the horn of a loudspeaker, but rather the loads in different applications. Based on the above principles, the moving parts can be either coils or magnetic tracks, and dozens of structures can be derived from the simplest structure, such as flat plate, multi-coil, and double-sided magnet types.
Features of voice coil motors
Single-phase motor
No reversing required, easy to control
Coreless structure
Eliminating cogging force, the force is proportional to the current, making it suitable for force control applications.
High-precision positioning
An air gap exists between the coil and the magnetic track, eliminating direct contact and ensuring high precision and wear-free operation, thus extending service life.
Rapid Response
Low-quality coil design enables high output while providing rapid response to control signals.
High bandwidth
The ultra-low electrical time constant enables the voice coil motor to respond quickly to control signals, making it suitable for high-frequency reciprocating motion.
Comparison of voice coil motors and linear motors
linear motor
Mostly refers to three-phase motors with unlimited travel.
Suitable for applications requiring high thrust, long stroke range, and high acceleration.
voice coil motor
Compact structure, small size, light weight, and fast response speed
Suitable for applications requiring high speed, high precision, short stroke, and small space.
Yacobes voice coil motor series
Yacobes offers the AVM series cylindrical voice coil motors and the AVA series flat voice coil motors to meet diverse needs.
The stroke range is 4~40mm, the continuous thrust range is 0.86~1111.4N, and the peak thrust range is 3.1~4715.2N.
ECOBESI Voice Coil Module Series
In addition to standard voice coil motors, we also offer four major series of voice coil modules: XMGV, XCV, TGV, and MBV.
It adopts crossed roller guides, which have the characteristics of high rigidity.
The encoder resolution options are 0.05μm, 0.2μm, 0.5μm, and 1μm. (SINCOS)
Suitable for scenarios requiring high response and high-precision positioning, its compact structure is suitable for micro-assembly pickup mechanisms.
The MBV module has a built-in spring as a counterweight, which is more suitable for high-speed vertical movement. In high-frequency operation, compared with cylinder or electric cylinder structures, MBV has superior precision control and fine trajectory control.
Application of ECOBEST voice coil motors in ventilators
Yacobes provides customers with voice coil motor solutions for ventilators. By controlling the gas valves of the ventilator through closed-loop force feedback of the voice coil motor, it has a faster response speed, which can make the delivery of air faster and more accurate, make it easier to control the exhalation mode, improve the user experience, and allow patients to breathe easily and freely under any pressure.
With its superior electromagnetic design, it delivers 25% higher output than other competitors' motors within the same size range.
The moving parts frame is made of environmentally friendly non-metallic materials, characterized by its light weight and lack of eddy currents. Compared to metallic frame designs, it exhibits higher acceleration under the same output force.
The motion support system consists of ultra-precision linear bearings and specially surface-treated guide shafts, with relative friction less than 15mN and long service life of moving parts.
Voice coil motors are characterized by simple structure, smooth operation, and high positioning accuracy.
To meet the diverse needs of our customers, we also offer customization services. We can design custom solutions based on your space dimensions, output power, stroke and other requirements (such as vacuum compatibility, pull shaft, gravity compensation, water cooling, etc.) to best match your application.
For more product details, please contact our professional team ([email protected]).
