A voice coil is a kind of linear actuator, it moves a given mass along a line. A voice coil motor is designed and optimized as the active control actuator to provide proper feedback force to reduce the amplitude of the vibration, and is fixed in the wholespacecraft. Us5341259a pivoting, dual state magnetic latch for disk. Its compact size allows it to fit into small spaces. Jun 18, 2018 this faq looks at another type of motor, generally known as the voice coil actuator vca and more formally as noncommutated dc linear actuator.
Damping vibrations in voice coil actuator international. Voice coil actuators precise control of zaxis and fsms these fast, high accuracy, linear voice coil actuators with integrated feedback are useful tools in laser scanning. Precision laser scanning can design custom motion control electronics and software for your voice coil actuator requirements. It needs a guidance system for full range of motion and to prevent the coil winding from rubbing against or crashing. Pdf percussion robots have successfully used a variety of actuator technologies to activate a wide array of striking mechanisms. Two concepts are chosen, a very stiff actuator consisting of a spindle drive and piezo modules and a soft actuator with spindle drive and spring voice coil. To be precise, it pushes or pulls on the mass, the mass then moves as a result of this force. A voice coil actuator, also known as a noncommutated dc linear actuator, is a type of direct drive linear motor. Cedrat technologies offers specific voicecoils adapted to par ticular clients requirements in terms of environment, static and dynamic regulation, motion. Dynamic modeling and control of voicecoil actuators.
It is sometimes said that voice coils are intended for fast. A voice coil is a linear actuator, that moves a mass along a line. Voice coil actuators with moving magnet and moving coil from h2w technologies voice coils are suitable for fixedstroke applications, with typical maximum strokes of 5 to 6 inches. The latch comprises a latch pin formed of a ferromagnetic material located on an arm extending from the voice coil of the actuator. Lfa2010 linear foucs actuator interface drawings presents the mechanical details necessary for integration of the product. Lowmass shortstroke voicecoil actuator for integrated disk. The intended application of the array is dynamic tactile stimulation, where multiple actuators generate an illusion of touching a moving pattern. Voice coil stage interfacing and user manual deatils installation, operation and maintenance of the product. A voice coil actuated air valve for use in compressor. Nov 15, 1977 all four actuator channels of the disk file module have independent readwrite and access capabilities.
The coils are attached to the static part of the actuator which enables a good thermal path. Aug 25, 2016 voice coil actuators with moving magnet and moving coil from h2w technologies voice coils are suitable for fixedstroke applications, with typical maximum strokes of 5 to 6 inches. 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. A voice coil powered controllable microjet injection system.
Pdf voice coil actuators for percussion robotics researchgate. A voice coil motor vcm control circuit controls operation of a vcm which positions a disk drive headactuator arm assembly. Whats the difference between voice coil actuators and. Direct drive linear motors low cost electric cylinder. Pdf voice coil actuators for two mtg instruments researchgate. The force generated is fairly constant throughout the stroke length, with a small dropoff, typically less than 5 percent, at the ends of stroke. H2w technologies offers miniature versions of both our moving coil and moving magnet voice coil actuators. All four actuator channels of the disk file module have independent readwrite and access capabilities.
Recently, taberner 11et al demonstrated a control strategy that can change and optimize. To test and demonstrate the quality of motion that can be achieved using combined position, velocity, and force control with voice coil actuators, we have designed an. The larger is suitable for a shoulder actuator and the smaller for a hand. Development of wearable microactuator array for 3d. This actuator has been manufactured using lowoutgassing materials as selected by nasa in order to make this actuator vacuum compatible. The low moving mass allows for high accelerations of light payloads.
It would be built with inexpensive, commercially available components magnet, voice coil, suspension from the loudspeaker industry. Optimal control design of a voice coil head actuator in a. Voice coil motor open source design, diy openactuator. Minimization of modeling error of the linear motion system. Often called a linear motor or voice speaker coil, the electromagnetic actuator is versatile and relatively easy to designbuild.
Applying a voltage across the terminals of the motor causes the motor to move to one direction. Dc motors, vcas offer highprecision continuous linear control of motion with minimal power when. Often called a linear motor or voicespeaker coil, the electromagnetic actuator is versatile and relatively easy to designbuild. A data processor is continuously updated with the current position and relative radial velocity of the disk drive headactuator arm assembly. Experimental results verified the force constant of the fabricated voice coil actuator is well matched with the designed value.
Linear voice coil motors actuators and micro voice coil. The coil wrapped around the trapezoidal voice coil is attracted to the magnets within. Additionally, we offer custom designed solutions to meet your application specifications. A good thermal path is beneficial for high force densities. Jul 07, 2017 this 3axis voice coil actuator stage has 2 inch travel on the x and y axes and 0. Voice coil impedance as a function of frequency and. In particular, it is commonly used to refer to the coil of wire that moves the readwrite heads in a movinghead disk drive. Us5384524a voice coil motor control circuit and method for. To be precise, it pushes or pulls on the mass, the mass then moves as a result of this.
Voice coil impedance as a function of frequency and displacement. It typically consists of an arrangement of a permanent magnet and coil, arranged so that currents in the coil generate a pair of equal and opposite forces between the coil and magnet. But a voice coil doesnt primarily move things, it is a consequence of the force it applies. This faq looks at another type of motor, generally known as the voice coil actuator vca and more formally as noncommutated dc linear actuator. A voice coil actuated air valve for use in compressor forced. The impedance can be only roughly modelled as a resistor re and an ideal inductance le, the occurrence of eddy currents in these structures usually decreases the inductance of the coil and increases losses at higher frequencies 3. A fully housed voice coil actuator vca further expands upon the idea of the semihoused vca, incorporating the selfaligning bushings and shaft, but fully captures the coil assembly to keep it concentric with the field assembly, adds an internal flex circuit to protect external moving wires and. This moving coil actuator ncc03 070011v comes supplied with an aluminum bobbin which allows for heat to be conducted away from the motor windings. Voice coil actuators with a moving coil as opposed to a moving magnet have low mass and low inertia, which enables the high acceleration and deceleration rates required for applications that involve mounting, assembly, and testing of semiconductors and electronic assemblies, such as cameras and screens for mobile phones. Lfa2010 linear fouc actuator brochure provides a brief presentation of the products features and specifications. V273 pimag voice coil linear actuator physik instrumente. A permanent magnet and a coil that is located in the air gap of the magnetic field. A moving magnet actuator is a type of electromagnetic linear actuator.
Thus a voice coil does not primarily move the mass, motion is a. Voice coil actuators are the simplest form of electric motor consisting of a noncommutated single coil or winding moving through a fixed magnetic field produced by stationary permanent magnets. Two concepts are chosen, a very stiff actuator consisting of a spindle drive and piezo modules and a soft actuator with spindle drive and springvoice coil. Model ifx200100 ifx200120 ifx400100 ifx400101 ifx410100. The term voice coil has been generalized and refers to any galvanometer like mechanism that uses a solenoid to move an object backandforth within a magnetic field. 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. A fully housed voice coil actuator vca further expands upon the idea of the semihoused vca. The actuator consists of a permanent magnet and an electromagnetic. A data processor is continuously updated with the current position and relative radial velocity of the disk drive head actuator arm assembly. When current flows through the coil, it moves in the magnetic field of the permanent magnet. A voicecoil motor is designed and optimized as the active control actuator to provide proper feedback force to reduce the amplitude of the vibration, and is fixed in the wholespacecraft.
The voice coil actuator would be the spool for modulating the valve orifice area. Voice coil actuators are available as a set consisting of the magnet and coil assemblies. High force oscillatory voice coil positioning stage. However, the current jet injection systems based on the voice coil actuator so far can only be used for a singleshot injection. Applications in the semiconductor and electronics industries are known for requiring extremely high throughput and micron or nanometerlevel resolution.
A voice coil motor vcm control circuit controls operation of a vcm which positions a disk drive head actuator arm assembly. It has very low electrical and mechanical time constants. The direction of movement is determined by the direction of current flow in the the single phase linear voice coil actuator allows direct, cog. Us5384524a voice coil motor control circuit and method. The main difference between this and a voice coil actuator is that in a moving magnet actuator, the magnet is intended to move and the coil.
Development of wearable microactuator array for 3d virtual. In comparison to earlier designs, the device has smaller dimensions of 2. To test and demonstrate the quality of motion that can be achieved using combined position, velocity, and force control with voice coil actuators, we have designed an arm using these technologies. Lfa2010 linear fouc actuator brochure provides a brief presentation of the products features and specifications voice coil stage interfacing and user manual deatils installation, operation and maintenance of the product lfa2010 linear foucs actuator interface drawings presents the mechanical details necessary for integration of the product. Mar 01, 2008 voice coil head actuator and 3phase stepper spindle motor in a computer harddrive. These include sufficient force over a relatively large distance, allow.
This linear and sometimes rotary motor is an effective solution for many applications and can be driven and controlled with fairly good precision and repeatability. Voice coil impedance as a function of frequency and displacement mark dodd1, wolfgang klippel2, and jack ocleebrown. The working principle of these moving magnet voice coil actuators is that the moving part is a magnet. Rectangular linear voice coil actuator rectangular voice coil actuators feature all of the inherent advantages of vca technology, such as directdrive, zero backlash and cog free operation for accurate motion, as well as high acceleration and use of single phase. Lowmass shortstroke voicecoil actuator for integrated. Moticont provides designs and manufactures linear motors, positioning stages, and fully integrated singlemultiaxis positioning systems including voice coil linear actuators, linear stepper motor, linear induction motor and many more. Both are simple electromechanical devices that can accomplish the task. The data processor provides signals to a digitaltoanalog converter dac of the vcm control circuit representative of the. Voice coil actuator products inertial force actuators voice coil actuator products.
Both designs achieve similar resolution but with different passive stiffness. Force generated by lorentz law does not vary linearly with the position of operating region about a constant current input. When it comes to linear motion, engineers often come down to two choices. A toggling, dual state magnetic latch is provided for a disk file rotary head positioner rotatably mounted relative to the base and includes a voice coil for rotary displacement within a magnetic field provided by an actuator voice coil permanent magnet. The name voice coil comes from one of its historically first applications. A novel 4 by 4 array of electromagnetic micro actuators operating on the principle of voice coil actuators is presented. Considering the above tradeoffs, a voice coil actuator was selected for the linear motor. A voice coil actuator controls the movement of the readwrite head following the principle of electromagnetic attraction and repulsion.
The lvdt core is incorporated into the shaft connecting the bellows and the voice coil. Voice coil actuators precise control of zaxis and fsms. This linear and sometimes rotary motor is an effective solution for many applications and can be driven. Mar 05, 2017 voice coil motor open source design, diy openactuator.
The nature of the voice coil impedance is dependent. It provides the motive force to the cone by the reaction of a magnetic field to the current passing through it. Voice coil drives consist of 2 essential components. A linear voice coil actuator is ideal for short stroke typically less than 2 inches closed loop servo applications.
Reversing the polarity of the applied voltage will move. Voice coil motor 11 comprises a pair of electromagnets 12a,b secured, as by screws, in circumferentially spaced relation to a front pole piece 14 and a central pole piece 15 formed. H2w has built its smallest moving magnet voice coil actuator ncm01040012ib to date, with an outside diameter of 0. The minimum air gap clearance between these assemblies is 0.
The coil and magnet are concentric about a common axis and there exists an engineered magnetic return path. Trapezoidal voice coil, 3 actuator axis, 4 arm, 5 disk head, 6 drive motor, and 7 discs or platters. However, the use of industrial strength voice coil actuators provides a compelling alternative given a desirable set of heterogeneous features and requirements that span traditional devices. Linear dc motors, voice coil motors vcm or voice coil actuators vca are the simplest type of electric motors. Originally used in radio loud speakers, voice coil actuators are gaining popularity in applications. Design of a rectangulartype voice coil actuator for frame. A voice coil consisting of a former, collar, and winding is the coil of wire attached to the apex of a loudspeaker cone.
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