Precision laser scanning can design custom motion control electronics and software for your voice coil actuator requirements. Voice coil drives consist of 2 essential components. Sensata technologies 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. This moving coil actuator ncc03 070011v comes supplied with an aluminum bobbin which allows for heat to be conducted away from the motor windings. The voice coil actuator would be the spool for modulating the valve orifice area. The data processor provides signals to a digitaltoanalog converter dac of the vcm control circuit representative of the. 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. 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.
Us5341259a pivoting, dual state magnetic latch for disk. 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. A permanent magnet and a coil that is located in the air gap of the magnetic field. Cedrat technologies offers specific voicecoils adapted to par ticular clients requirements in terms of environment, static and dynamic regulation, motion. Thus a voice coil does not primarily move the mass, motion is a. A voice coil actuated air valve for use in compressor. 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. 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. Mar 05, 2017 voice coil motor open source design, diy openactuator. 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.
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. A novel 4 by 4 array of electromagnetic micro actuators operating on the principle of voice coil actuators is presented. It provides the motive force to the cone by the reaction of a magnetic field to the current passing through it. Us5384524a voice coil motor control circuit and method for. It would be built with inexpensive, commercially available components magnet, voice coil, suspension from the loudspeaker industry. A moving magnet actuator is a type of electromagnetic linear actuator. 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. To be precise, it pushes and pulls a mass wherever it is along a line. The larger is suitable for a shoulder actuator and the smaller for a hand. A fully housed voice coil actuator vca further expands upon the idea of the semihoused vca. H2w has built its smallest moving magnet voice coil actuator ncm01040012ib to date, with an outside diameter of 0.
Voice coil stage interfacing and user manual deatils installation, operation and maintenance of the product. Development of wearable microactuator array for 3d. All four actuator channels of the disk file module have independent readwrite and access capabilities. Considering the above tradeoffs, a voice coil actuator was selected for the linear motor. A voice coil is a kind of linear actuator, it moves a given mass along a line. A voice coil actuator controls the movement of the readwrite head following the principle of electromagnetic attraction and repulsion. The working principle of these moving magnet voice coil actuators is that the moving part is a magnet.
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. Minimization of modeling error of the linear motion system. The coil wrapped around the trapezoidal voice coil is attracted to the magnets within. Voice coil actuators precise control of zaxis and fsms. The coils are attached to the static part of the actuator which enables a good thermal path. Lfa2010 linear fouc actuator brochure provides a brief presentation of the products features and specifications. 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. The coil and magnet are concentric about a common axis and there exists an engineered magnetic return path. 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. 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. 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. A voice coil actuated air valve for use in compressor forced. 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. Often called a linear motor or voice speaker coil, the electromagnetic actuator is versatile and relatively easy to designbuild.
Dc motors, vcas offer highprecision continuous linear control of motion with minimal power when. Voice coil impedance as a function of frequency and displacement mark dodd1, wolfgang klippel2, and jack ocleebrown. In particular, it is commonly used to refer to the coil of wire that moves the readwrite heads in a movinghead disk drive. Trapezoidal voice coil, 3 actuator axis, 4 arm, 5 disk head, 6 drive motor, and 7 discs or platters. It is sometimes said that voice coils are intended for fast. The actuator consists of a permanent magnet and an electromagnetic. Linear dc motors, voice coil motors vcm or voice coil actuators vca are the simplest type of electric motors.
A voice coil actuator, also known as a noncommutated dc linear actuator, is a type of direct drive linear motor. 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 data processor is continuously updated with the current position and relative radial velocity of the disk drive headactuator arm assembly. Pdf voice coil actuators for two mtg instruments researchgate. 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. When current flows through the coil, it moves in the magnetic field of the permanent magnet. This linear and sometimes rotary motor is an effective solution for many applications and can be driven. Whats the difference between voice coil actuators and. Voice coil motor open source design, diy openactuator. Voice coil actuators are available as a set consisting of the magnet and coil assemblies. A linear voice coil actuator is ideal for short stroke typically less than 2 inches closed loop servo applications. 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.
Optimal control design of a voice coil head actuator in a. However, the current jet injection systems based on the voice coil actuator so far can only be used for a singleshot injection. A good thermal path is beneficial for high force densities. Pdf percussion robots have successfully used a variety of actuator technologies to activate a wide array of striking mechanisms. Force generated by lorentz law does not vary linearly with the position of operating region about a constant current input. Shorya, it will take me the rest of my life to learn all of what you have taught me. A data processor is continuously updated with the current position and relative radial velocity of the disk drive head actuator arm assembly. The nature of the voice coil impedance is dependent. But a voice coil doesnt primarily move things, it is a consequence of the force it applies. Reversing the polarity of the applied voltage will move.
Pdf voice coil actuators for percussion robotics researchgate. Us5384524a voice coil motor control circuit and method. Model ifx200100 ifx200120 ifx400100 ifx400101 ifx410100. 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.
Nov 15, 1977 all four actuator channels of the disk file module have independent readwrite and access capabilities. 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. Both are simple electromechanical devices that can accomplish the task. It needs a guidance system for full range of motion and to prevent the coil winding from rubbing against or crashing.
Dynamic modeling and control of voicecoil actuators. The force generated is fairly constant throughout the stroke length, with a small dropoff, typically less than 5 percent, at the ends of stroke. Lowmass shortstroke voicecoil actuator for integrated disk. The latch comprises a latch pin formed of a ferromagnetic material located on an arm extending from the voice coil of the actuator. A voice coil motor vcm control circuit controls operation of a vcm which positions a disk drive head actuator arm assembly. 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 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. Mar 01, 2008 voice coil head actuator and 3phase stepper spindle motor in a computer harddrive.
In comparison to earlier designs, the device has smaller dimensions of 2. Often called a linear motor or voicespeaker coil, the electromagnetic actuator is versatile and relatively easy to designbuild. High force oscillatory voice coil positioning stage. A voice coil powered controllable microjet injection system. Lfa2010 linear foucs actuator interface drawings presents the mechanical details necessary for integration of the product.
Damping vibrations in voice coil actuator international. The direction of movement is determined by the direction of current flow in the the single phase linear voice coil actuator allows direct, cog. Additionally, we offer custom designed solutions to meet your application specifications. Applying a voltage across the terminals of the motor causes the motor to move to one direction. Its compact size allows it to fit into small spaces. A voice coil is a linear actuator, that moves a mass along a line. Voice coil actuator products inertial force actuators voice coil actuator products. 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. H2w technologies offers miniature versions of both our moving coil and moving magnet voice coil actuators. Direct drive linear motors low cost electric cylinder. 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. Jul 07, 2017 this 3axis voice coil actuator stage has 2 inch travel on the x and y axes and 0. Originally used in radio loud speakers, voice coil actuators are gaining popularity in applications. Applications in the semiconductor and electronics industries are known for requiring extremely high throughput and micron or nanometerlevel resolution.
The minimum air gap clearance between these assemblies is 0. 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. The low moving mass allows for high accelerations of light payloads. Recently, taberner 11et al demonstrated a control strategy that can change and optimize. Development of wearable microactuator array for 3d virtual. 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. The kit allows users to take advantage of the inherent benefits. Lowmass shortstroke voicecoil actuator for integrated. Voice coil impedance as a function of frequency and. Linear voice coil motors actuators and micro voice coil. To be precise, it pushes or pulls on the mass, the mass then moves as a result of this. This actuator has been manufactured using lowoutgassing materials as selected by nasa in order to make this actuator vacuum compatible. Both designs achieve similar resolution but with different passive stiffness. The name voice coil comes from one of its historically first applications.
The intended application of the array is dynamic tactile stimulation, where multiple actuators generate an illusion of touching a moving pattern. When it comes to linear motion, engineers often come down to two choices. To be precise, it pushes or pulls on the mass, the mass then moves as a result of this force. Voice coil impedance as a function of frequency and displacement. It has very low electrical and mechanical time constants. 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. Moving magnet actuator linear actuator magnetic innovations.