The vcs1010 voice coil linear stage is a high performance compact positioning actuator. Designed for linear control of voice coil motors, the cn3927 is capable of operating voltage from 2. Operating a voice coil motor using a function generator a voice coil motor can be oscillated at a set frequency in open loop operation using a function generator. Voice coil motor vcm driven ultraprecision motion stages have been shown to successfully achieve subnanometer resolution over stroke lengths as long as 150 mm, when coupled with a ball screw drive 1. Vcm is defined as voice coil motor very frequently. The name voice coil comes from one of its historically first applications. Introduction voice coils were originally developed for loud speakers for the conversion of electrical energy into sound wave through the use of a diaphragm. An underhung motor can achieve higher efficiency because the moving mass is usually reduced by the voice coil being shorter and therefore lighter. The voice coil motor will oscillate at the desired frequency and displacement.
Ki the ratio between peak force in newtons, and excitation in. In developing a lowcost ultrasound scanner for the. Voice coil motor how is voice coil motor abbreviated. Voice coil modules compact single phase miniature voice coil modules with guide, driven by single fase avm voice coil linear motor. Undervoltage lockout uvlo the drv201a is an advanced voice coil motor driver thermal shutdown for camera auto focus. Linear voice coil motors actuators and micro voice coil. Power electronic tips power electronic news, editorial, video and resources. When it comes to linear motion, engineers often come down to two choices. The ignition coils task is to induce a high voltage from a low voltage. The generated force is proportional to the current that flows through the motor coil. Pdf application of voice coil motors in active dynamic. Hi, i am new to electronics and am making a simple mistake but do not see it. Calculation of motor power dissipation for different motion. Alongside the iron core, the main components are the primary winding, the secondary winding and the electrical connections.
When current is applied to the coil, a force is generated in direct proportion to the amount of current. The blx has a symmetrical bellshaped form approaching zero for high displacement. Direct drive linear motors low cost electric cylinder. The voice coil motor is a widely used mechatronic device, which represents a typical electrodynamic actuator for machine tool axes, bonding machines and hydraulicpneumatic valve drives. Rotary voice coil actuators are supplied unhoused without bearings. The voicecoil actuator is a linear motor which can provide precise force and positioning over a modest distance, and is easy to control. This optimized vcm can easily be implemented to control the low frequency vibration typically within the range 0. The optimized design of a voice coil motor was performed, which can be used as an actuator for the active vibration isolation system.
Design and implementation of a voicecoil motor servo control. Design and optimization of voice coil motor for application. Trapezoidal voice coil, 3 actuator axis, 4 arm, 5 disk head, 6 drive motor, and 7 discs or platters. This allows for the voice coil to move in both directions. The motor used in the vcs1010 voice coil stage was custom designed and optimized using advanced computer modeling. High to low most popular title manufacturer newest oldest availability 12 per page 24 per page 48 per page 72 per page 120 per page page of 5. Voice coil modules atb automation mechanics motion. In maxlink, select pba motors cvc for the family dropdown box.
Result of the optimization was verified using fem simulation. Precision motion control solutions celera motion, a. Sandberg 82526 standard music headphone with foldable earcups. The small size of the springs requires very high strength material to with stand shock loads when the phone is dropped. The key element is the voice coil motor that we extracted from a regular hard disk drive a 3. It would be built with inexpensive, commercially available components magnet, voice coil, suspension from the loudspeaker industry.
In a recent study 2, it has been demonstrated that a flexure based vcm stage. Ti, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. Unlike a conventional motor design, bl changes very slowly as function of voice coil displacement. Modeling and characterization of a voice coil motor. I100 this is the excitation current corresponding to 100% ed operation. I am able to drive a lvcm02503801 linear voice coil using a cytron 10a motor driver shield and a spwm sinewave pwm signal but when i add an rc filter i get response in the motor. Etchmet alloys for voice coil motors and optical image. Every month, voice coil delivers loudspeaker professionals with the latest in technology and components. Calculation of motor power dissipation for different motion profiles symbols. Voice coil motors vcm voice coil actuators stanford magnets.
Optical image stabilization ois stmicroelectronics. Cn3927 low voltage voice coil motor driver with i2c interface. Internal circuit protection includes thermal shutdown with hysteresis, flyback clamp diode, and undervoltage monitoring. The voice coil actuator would be the spool for modulating the valve orifice area. Understanding the working of such case of a shorting ring, will also lead to. If higher efficiency is desired for longer stroke actuators, the coil assembly can be wound as a multiphase coil and then it will have to be commutated. If you have any comments or suggestions, please leave us a message. This value will vary for a motor of given form factor depending on the coil winding. This is due to the fact that the motor constant is inversely proportional to the stroke. This motor electrical inductance lx, xprot x 0 25 01050 0.
Pdf design and optimisation of a voice coil motor vcm with a. The max14570 utilizes a switching output topology to provide high efficiency over the entire input supply voltage range. For example, a conventional loudspeaker uses a voice coil motor to drive a cone which converts the coils oscillating motion into sound energy. The term is also used for voice coil linear motors, such as those used to move the heads inside hard disk drives, which produce a larger force and move a longer. Shutter speeds in excess of 10 mmms are attained, allowing switching of a focused. Pdf voice coil actuators for percussion robotics researchgate. The kit allows users to take advantage of the inherent benefits.
Stw subwoofers big bass for small enclosures tymphany. These devices have a relatively large mass lenses suspended by extremely small, thin springs. Useful stroke the range of movement over which the force developed by the voice coil is 50% of the peak output force with 100% excitation. Decrease timetomarket with celera motion precision components and mechatronic assemblies, combined with extensive design, integration, and fabrication expertise delivering optimal solutions for the most demanding applications. Whether repairing one motor coil, or manufacturing hundreds of motor coils, we manufacture ac motor coils to your specifications, andor industry standard specifications, economically and according to your scheduled needs. Applying a voltage to the device actuates the coils, which rotates the arm. Optimal control of a voicecoilmotor with coulombic friction. Voice coil actuators are linear motors with a permanent magnet. In order to read a pdf file, you must have adobe acrobat reader installed on. Design, modeling, and seek control of a voice coil motor actuator with nonlinear magnetic bias. The linear range of a voice coil the range within which developed force is 90% of peak force will normally be roughly equal to the difference between the coil length, and the length of the pole. Pdf percussion robots have successfully used a variety of actuator technologies to activate. Precision position control of a voice coil motor using.
A voice coil actuator, also known as a noncommutated dc linear actuator, is a type of direct drive linear motor. Modeling and design of a voicecoil motor for autofocusing. Fast operation low electrical inductance, and low moving mass enable fast inflow of current and high acceleration. Voice coil motors vcm, also called voice coil actuators vca, are a very mature design that utilizes a magnet and yoke in conjunction with a coil. Optimal control design of a voice coil head actuator in a. Ac motor coils induction electric coil electric motor coils. The coil is typically connected to a mechanism which translates the coil s linear. The max14570 is a highefficiency voice coil motor vcm driver ideal for use in powersensitive autofocus camera applications. Let the operation point of the magnet be its maximum energy product that generates larger flux density in the air gap. Even to this day, a great deal of neodymium magnets is still serving as voice coil motor magnets which utilized as servo drive in hdd and the. The xl4s is optimized to control singlephase motors or voicecoil axes like aerotechs tlg4000 fast tool servo.
Aug 25, 2016 the term voice coil comes from one of the first applications. The effect of faraday ring shorting ring usage on voice. Drv201 voice coil motor driver for camera auto focus. A voice coil actuator controls the movement of the readwrite head following the principle of electromagnetic attraction and repulsion. With a vcm, suitable controllers can be designed for periodic excitation force rejection by using. The magnets used in equipment solutions motors have some of. On the other hand that short voice coil typically has less thermal mass than the much longer voice coil of an overhung motor, so in general underhung motors are more susceptible to thermal compression. Size of housing diameter and length, or height and width and length.
We offer many sizes, former wire materials and options. The fractional order proportionalintegralderivative fopid controller can improve the control performances of the conventional integer. This product mates the voice coil motor to a very smooth crossroller bearing stage and a very high resolution position feedback sensor. Suited for airlines, trains, busses, hospitals, cinemas etc. Pdf this paper proposes a new application for the rotary voice coil motor vcm. Enlarging w 1 may increase, however, if lg is suppressed, less number of windings are included.
This force is almost constant in the specified stroke range of the motor. Both are simple electromechanical devices that can accomplish the task. In its simplest form, a linear voice coil actuator is a tubular cod of wire situated within a radially oriented mag netic field, as shown in figure 2. The si9961a contains all of the power and control circuitry necessary to drive the vcm that is typically found in 31 2 inch hard disk drives and optical disk drives. Pdf halbach magnetic circuit for voice coil motor in. The motor used in the vcs1010 voice coil stage was custom. Voice coil motors are highly controllable electrical actuators suitable for applications needing only limited displacement.
Voice coil motor driver, spindle motor driver, and voltage monitor, tls2205 datasheet, tls2205 circuit, tls2205 data sheet. The noncommutated motor construction increases reliability. Design and analysis of linear voice coil motor for automatic. Optional output slewrate control and spreadspectrum oscillator reduce conducted noise and radiated. Applying a voltage across the terminals of the motor causes the motor to move to one direction. Voice coil actuator h2w technologies linear motors. Go to the motor parts and reselect the 72x32x15mm magnet again. Custom voice coils have been the core of our business at precision econowind since we began producing electric coils over 40 years ago. Coupling the rotary voice coil actuator to your bearing system and a rotary encoder or other feedback device yields a system that is capable of intricate angular position, velocity, and acceleration control.
The automotive transmission has been used to change the gear ratio of automotive by manual or automatic method. The vcs10 voice coil stage can optionally be configured with a 10 millimeter clear aperture through its center, which is then designated a vcs1010. Driving a linear voice coil motor arduino forum index. Voice coils custom voice coils made in the usa for subwoofers and speakers. Voice coil impedance as a function of frequency and. A voice coil actuated air valve for use in compressor forced. A voicecoil motor is a special form of linear motor with one instead of three phases. A voice coil with a height of 5 mm and a stray field outside the gap may cause such a characteristic.
Voicecoil motor how is voicecoil motor abbreviated. Advanced power electronics center department of electrical and control engineering national chiao tung university, taiwan. Our actuators are unique in that force, position, and speed are totally programmable. This study aims to fast move the coil so that the move time can be shortened. The vcm consists of a core pack of permanent magnets and a moving coil, both of which are surrounded by a shell. Voice coil motors are widely used in the industry owing to their advantages of light weight, lowest price and good repeatability as digital camera and mobile phone camera. The voice coil actuator vca developers kit from bei kimco is a completely selfcontained kit including a vca with builtin feedback sensor and a programmable controller with motion control software that runs on the users local pc. The object of this study is to develop a selftuning fractional order proportionalintegralderivative sfopid controller for controlling the mover position of a direct drive linear voice coil motor vcm accurately under different operational conditions. Difference between voice coil actuators and solenoids reversing the current flow in the coil causes a reversal in the interaction with the field of the permanent magnet.
Loud speakers were used to amplify or create a louder voice, thus the name voice coil stuck. A voice coil consisting of a former, collar, and winding is the coil of wire attached to the apex of a loudspeaker cone. The instructions in this document assume that you are familiar with the maxlink software. Linear dc motors, voice coil motors vcm or voice coil actuators vca are the simplest type of electric motors. Because of this and since this document is on the effect of shorting ring on voice coil impedance, the shorting ring investigated here will be of this kind. The coil and magnet are concentric about a common axis and there exists an engineered magnetic return path. Smac moving coil actuators electric actuators voice. Vcm current is internal current limit for vcm driver controlled with a fixed frequency pwm controller or a 4kv esdhbm linear mode driver. Drv201a voice coil motor driver for camera auto focus. Cn3927 low voltage voice coil motor driver with i2c interface 1. The displacement of the voice coil is proportional to the current in the coil. Ignition coils in motor vehicles function, diagnosis. Figure 1 linear voice coil actuator used in a wide range of medical and industrial applications, an axial voice coil actuator is composed of a permanent magnet situated within a moving tubular coil of wire, all inside of a ferromagnetic becomes magnetized and repels against the magnets, producing an in and out, back and forth motion. High force density linear permanent magnet motors core.
Pdf design, modeling, and seek control of a voicecoil. Protruding length of shaft at either full retraction or midstroke. In this paper, we describe a voice coil motor vcm that can serve as the actuator in an active dynamic vibration absorber which can be regulated for different conditions. Round, rectangular, dshaped, flat wire or custom shaped coils can be produced using precision layering practices. Some introduction of voice coil motor magnets sdm magnetics co. The typical characteristics of a voice coil motor are a round coil, concentric with and located in a gap where a radial magnetic field is present. Choose the appropriate model number of the motor under the model and the correct encoder 3. Positioning control of voice coil motor with shorted turn. Our encoders, motors, servo drives, air bearing spindles, and mechatronic subsystems enable engineers to solve. Otherwise, if w 2 is suppressed, yoke b may become saturated.
Application of voice coil motors in active dynamic vibration absorbers article pdf available in ieee transactions on magnetics 4. Voice coil magazine 2010 april issue audio components. The fixed part of the voice coil motor is a permanent magnet and the moving part is the coil. Whats the difference between voice coil actuators and. The direct coupling of the motor to the load allows for fast acceleration deceleration and high speed operation.
Smac is a leading manufacturer of precision programmable electric actuators based on moving coil technology. Pdf optimal control of a voicecoilmotor with coulombic. It was specifically developed for applications requiring both high precision and highspeed positioning over a short to medium stroke. The si9961a is a linear actuator voice coil motor driver suitable for use in disk drive head positioning systems. Especially developed for high precision applications with high oscillation frequencies. Linear voice coil motors with internal bearing pwrcon. Considering the above tradeoffs, a voice coil actuator was selected for the linear motor. The coil were used for vibrating the paper cone of a loudspeaker. The amplitude of the frequency determines the displacement of the voice coil motor. With the xl4s, you can achieve industryleading settling times, longterm thermal stability, and sub. Abstract the voicecoilmotor is a widely used mechatronic device, which represents a typical electrodynamic actuator for machine tool axes, bonding. Althought the motor constant is less than expected, it is a large improvement over the current motor used in needlefree injection, which has a motor constant of 3. Voice coil impedance as a function of frequency and displacement mark dodd1, wolfgang klippel2, and jack ocleebrown.
However a different approach is trying a 4layer voice coil in voice coil instead of a larger magnet. The portion of the coil which lies outside the airgap field dissipates power as heat but develops no useful force. Please consult the factory for long stroke applications. Designed for linear control of small form factor voice coil motors, the a3907 is capable of peak output currents to 102 ma and operating voltages to 5. Voice coil parameters several parameters describe a particular voice coil. Voice coil motors in computer hard disk drives are shown to make excellent mechanical shutters for light beams.
The coil wrapped around the trapezoidal voice coil is attracted to the magnets within the steel poled. Ignition coil structure the design of a conventional ignition coil is basically similar to that of a transformer. The early strong decay of the blcurve is typical for a short voice coil. A voice coil with large surface area also offers another benefit power compression is practically nonexistent. With stw, it was put into the voice coil this improves the performance of the driver by raising the motor force factor. In this paper, we describe a voice coil motor vcm that can serve as the actuator in an activ e dynamic vibration absorber which can be regulated for different conditions. A 4layer voice coil, however, will need a thicker wire and therefore we have to modify the air gap. Reversing the polarity of the applied voltage will move the motor to the opposite direction. A voice coil powered controllable microjet injection system. It provides the motive force to the cone by the reaction of a magnetic field to the current passing through it. A desired frequency and amplitude is set in the function generator. Smac electric actuators are designed to perform at exceptionally high speeds or very low speeds and with submicron accuracy and repeatability. Description the cn3927 is single 10bit dac with 150ma output current sink capability. Length of stroke, measured either starting from full retraction or midstroke.
In recent years, the most common application for voice coils has been to move the heads inside computer disk drives, but theyre also widely found in medical devices, mirror controls, and oscillating systems. Electrical parameters r20 this is the nominal coil resistance of the motor measured at 20 pc. Voice coil actuation exploits the interaction between a currentcarrying coil winding and the field generated by a permanent magnet. It has an integrated da converter for setting the vcm current.
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