In this paper, we describe a voice coil motor vcm that can serve as the actuator in an. The coil and magnet are concentric about a common axis. Coils are to be manufactured with dieformed aluminum or copper fins with self spacing collars which completely. It has an integrated da converter for setting the vcm current. The reason is to reduce the induced current in the stator which leads to overheating of the motor and energy losses that could be used for creating the magnetic field instead. Analysis of a novel coil design for axial flux machines core. 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.
Finemotor has become the industry standard and is the optimum simulation tool for designing the magnet system, voice coil and spider for woofers, domes, telephonereceivers, headphones etc. The second optimization index is the motor constant for unit current density, which is a measure of heat dissipated per unit force, independent of the coil. The direct coupling of the motor to the load allows for fast acceleration deceleration and high speed operation. Voice coil motors are highly controllable electrical actuators suitable for applications needing only limited displacement. New linear voice coil motors by moticont motion control. Some might wonder why use laminated sheets instead of just one big iron core. Moticont has introduced four new models of linear voice coil motors, the lvcm070 series. The heat removal from this design is more difficult. The motor is fabricated and characterization reveals it to have a motor constant of 8. Reversing the polarity of the applied voltage will move. Drv201 voice coil motor driver for camera auto focus.
Althought the motor constant is less than expected, it is a large improvement over the current motor used in needle free injection, which has a motor constant of 3. Linear voice coil motors actuators and micro voice coil. Voice coil motors of akribis systems atb automation. The max14570 is a highefficiency voice coil motor vcm driver ideal for use in powersensitive autofocus camera applications. The voice coil motor structure comprises a lens mount for fixedly mounting a lens 12, a focusing coil 6, a tilting. Minimization of modeling error of the linear motion system. Voice coil magazine 2010 april issue audio components. Its operation is based on the principle that when a current carrying conductor is placed in a. The akribis voice coil motor is a direct drive motor without cogging and backlash.
The advantage of brake systems wired in this way is. Undervoltage lockout uvlo the drv201a is an advanced voice coil motor driver thermal shutdown for camera auto focus. Result of the optimization was verified using fem simulation. Voice coil with rail guide and encoder continuous forces 5 74n stroke 1530mm encoder 1.
A voice coil motor is designed and optimized as the active control actuator to provide proper. The si9961a is a linear actuator voice coil motor driver suitable for use in disk drive head positioning systems. Undervoltage lockout uvlo the drv201 device is an advanced voice coil motor thermal shutdown driver for camera auto focus. Applying a voltage across the terminals of the motor causes the motor to move to one direction. The voice coil is the motor part of the servo system that positions the heads. Calculation of motor power dissipation for different. The direction of movement is determined by the direction of current flow in the the single phase linear voice coil actuator allows direct, cog free. The voice coil motors are supplied as separate components or as complete linear modules. X distance to travel in meter t 1 acceleration time in second t 2.
This ironfree stator topology is used in the newly developed 10mw sway generator from smart motor as. Voice coil article about voice coil by the free dictionary. The voice coil motor also includes a magnetic part including magnets and yokes, and an electrical part including a coil winding. Fast operation low electrical inductance, and low moving mass enable fast inflow of current and high acceleration. Modeling and characterization of a voice coil motor. The magnetic part is rigidly coupled to the lens holder to form. Let the operation point of the magnet be its maximum energy product that generates larger flux density in the air gap. Drv201a voice coil motor driver for camera auto focus. In recent years, the lorentz motor lm has been applied widely as an actuator to generate forces with direct drive, fast response time, great precision, low noise, low vibration, etc. From model and simulation to automotive application. C total mass coil mass geeplus vm3850rb 0 5 10 15 20 25 30 012 345678 force n vs displacement mm 370. A voice coil motor apparatus applied to an autofocus or variablefocus lens module of a miniaturized camera includes. High force density linear permanent magnet motors core. Methods of manufacturing voice coil motor magnetic returns.
Voice coil motors do not have commutator, but uses a position sensor. Motor generator pulse motor pendulum motor selfrunning transformers bedini motor magnetic motor magnet motor motor magnetico energia libre generador newm. Operating a voice coil motor using a function generator. The optimized design of a voice coil motor was performed, which can be used as an actuator for the active vibration isolation system. Calculation of motor power dissipation for different motion profiles symbols. Althought the motor constant is less than expected, it is a large improvement over the current motor used in needle free. Pdf application of voice coil motors in active dynamic. The voice coil motor will oscillate at the desired frequency and displacement. Linear dc motors, voice coil motors vcm or voice coil actuators vca are the simplest type of electric motors. Stepper motors are special versions of the synchronous machine, in which the rotor is a permanent magnet, while the stator consists of a coil package.
Voice coil impedance as a function of frequency and. Magnetic field analysis of lorentz motors using a novel. Fd178 bc, dc brushless fan, single coil brushless dc motor drivers with soft switching and pwm control 2 to 6. Coils shall be plate fin type construction providing uniform support for all coil tubes. Wiring diagrams brake rectifiers and coil data installation sew. This includes rectangular micro speakers and voice. The max14570 utilizes a switching output topology to provide high. The amplitude of the frequency determines the displacement of the voice coil motor. Coil mass body mass housing outside diameter housing length. The solution is to check the box compensated top plate id x in motor parts, because that will keep a constant voice coil clearance and at the same time recalculate the magnet gap field.
Voice coil impedance as a function of frequency and displacement mark dodd1, wolfgang klippel2, and jack ocleebrown. Very high speeds and accelerations can be easily achieved. A structure for a voice coil motor providing controllable lens tilt capability. Identify coils end in 3 phase ac induction motor for star. Application of voice coil motors in active dynamic vibration absorbers.
Apply 12 volt ac to one coil pair and look at the waveform on that coil and another coil using a two channel oscilloscope. The positioning accuracies of less than one micron are achievable. Dc motor principle a machine that converts dc power into mechanical energy is known as dc motor. There are specific instances when the brake voltage can be tapped from the motors terminal block. The winding coil is then inserted into the slots of the stator core. The si9961a contains all of the power and control circuitry necessary to drive the vcm that. Dc motors although ac motors are used in most of the cases, dc motors have many applications and used for multipurpose applications.
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