Motion Control Tutorial – What is a Voice Coil Actuator?

Motion Control Tutorial – Understanding the Basics of a Voice Coil Actuator

 

A voice coil actuator, also known as a non-commutated DC linear actuator, is a type of direct drive linear motor.  The name “voice coil” comes from one of its historically first applications: vibrating the paper cone of a loudspeaker.  They are currently used for a wide range of applications, including moving much larger masses.  It consists of a permanent magnetic field assembly (permanent magnets and ferrous steel) and a coil assembly.  The current flowing through the coil assembly interacts with the permanent magnetic field and generates a force vector perpendicular to the direction of the current.  The force vector can be reversed by changing the polarity of current flowing through the coil.

A non-commutated DC linear actuator, typically referred to as a voice coil, is capable of a displacement of up to 5 inches, whereas most actuators have displacements up to 2 inches.  Voice coils come in a range of sizes, from devices that generate a few ounces of force, to others that generate several hundred pounds of force.  In addition, voice coil actuators can move bi-directionally, have a constant force over the stroke, and can be used for either open loop applications or closed loop position or force applications.

A voice coil actuator generates a force based on an interaction of current carrying conductors in a permanent magnetic field.  The force generated by the voice coil is proportional to the cross product of the current flowing through the coil and the magnetic flux in the permanent magnetic field, as dictated by Lorentz’ force equation:

F = B x I

F= Force (lbs or N)
B = Flux density (Tesla)
I = Current (Amps)

The force generated is relatively constant throughout the stroke of the actuator, with minor decreases in force at the beginning and end of the stroke.

Either the coil assembly or permanent magnetic field assembly can be used as the moving member in a voice coil actuator.

Moving Coil

Voice coil actuators come in a variety of packages.  The standard type, which most people are familiar with are moving coil type actuators.  These typically involve a coil wound around a bobbin, which can be made from many non-magnetic materials, which moves in and out of a permanent magnetic field assembly consisting of a steel housing with a concentric permanent magnet assembly in the middle.  A typical example can be found below:

Moving Magnet

Another common type of actuator would be the moving magnet design, where the coil is fixed and magnet assembly moves.  This construction change would prevent moving leads during operation.  The package operates similarly, but instead of an exposed coil that moves in and out of the magnet assembly, the moving magnet style utilizes a permanent magnetic field assembly “piston” moving inside a cylindrical coil tube.  This style often comes with the permanent field assembly attached to a shaft, and end caps containing bearings so that this style is most commonly supplied with an integrated bearing system.  A typical example can be found below:

There are variations on both common designs of either actuator design that allow for unique geometry, and the integration of voice coil actuators into several applications.

A few examples of customizations available are:

  • Large radial clearances so that the voice coil can be used in limited rotation applications
  • Designs that intentionally operate the voice coil motor in an arc (commonly referred to as a rotary voice coil actuator)
  • Using low outgassing materials to enable use in vacuum environments
  • Integration of feedback devices for closed loop control

Voice coil actuators are typically used in focusing applications, oscillatory systems, mirror tilting, and miniature position control.

Advantages of Voice Coil Actuators

  • Simplicity of construction
  • Very low hysteresis
  • Small size
  • High accelerations
  • No cogging or commutation

Typical Specifications for Voice Coil Actuators

Type Stroke Peak Force Diameter Power Consumption Frequency Range
Moving Coil 0.1 to 5.2 inches

0.1 to 134 mm

0.1 to 1755 lbs

0.1 to 7020 N

0.4 to 10 inches

10 to 254 mm

1 to 2700 watts 1 to 500 Hz
Moving Magnet 0.1 to 4 inches

0.1 to 101 mm

0.1 to 419 lbs

0.1 to 1865 N

0.4 to 6.5 inches

10 to 164 mm

1 to 3400 watts 1 to 500 Hz

 

H2W Technologies, Inc. is dedicated to the design and manufacture of linear and rotary motion products that are used in the motion control industry. The complete line of linear electric motors includes: Single and dual axis linear steppers, DC brush and brushless linear motors, voice coil actuators, and AC induction motors. Also offered is a complete line of ball screw, lead screw and belt driven positioning stages.

Other motion control products include: Limited angle torque motors for compact, limited angular excursion rotary servo applications, 3 phase brushless rotary servo motors with matching digital servo amplifiers and permanent magnet linear brakes for fail-safe, zero power braking for baggage handling and people moving applications as well as amusement park rides.

With over 75 years combined experience in the linear and rotary motion field, the H2W Technologies team of engineers offers the optimal solution to the most demanding motion control, requirements.

For additional information contact Mark Wilson at H2W Technologies, 26380 Ferry Ct, Santa Clarita,  CA 91350; Tel: 888-702-0540 FREE, Fax: 661-251-2067, E-Mail: info@h2wtech.comor visit the website at http://www.h2wtech.com

 

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Motion Control – Large Open Center XY Stages from Intellidrives!

Intellidrives Motion Control Component - Large Open Center XY-Stages

 

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Philadelphia, PA, — Motion Control Components and Systems – The demand for a high accuracy, robust, open-frame stages is met with IntelLIDrives dual-axis, large aperture stages that address the unique needs of scanning microscopy, wafer and printed circuit board inspection, automated assembly and wide range of specimens and samples scanning in many types of imaging techniques and applications.

Very precise fine positioning and control is easily achieved through the combination of a stable closed-loop control system and an associated joystick option. In addition, the stages can be combined with our Z Stages to form an XYZ stage ideally suited for laser scanning microscopy.

These stages can be motorized with stepper motors and brush-less servo motors with encoders.

Optional high-resolution, non-contact linear encoder is available. This non-contact encoder offers exceptional repeatability and stability over a range of operating conditions. Both digital and analog output versions are available with resolutions in sub-micron range.

Features:

  • STROKE 100, 200, 300 mm
  • APERTURE 188, 288, 388 mm
  • REPEATABILITY 10 micron
  • RESOLUTION 1 micron
  • STEPPER, SERVO, SMART MOTOR
  • LINEAR ENCODER OPTION
  • JOYSTICK OPTION

FOR ADDITIONAL INFORMATION ABOUT THESE LARGE OPEN CENTER XY STAGES – CLICK HERE

TO WATCH VIDEO – CLICK HERE

FOR ADDITIONAL INFORMATION FROM INTELLIDRIVES- CLICK HERE

About IntelLiDrives —

IntelLiDrives, Inc. manufactures linear actuators, XY tables and rotary tables for the industry, government, science and research institutions around the world. Our precision rotary actuators, XY stages and linear actuators are used in the applications in medical devices, life sciences, semiconductor and electronic assembly manufacturing, data storage, laser processing, military/aerospace, photonics, automotive and test assembly, research and development and other industries requiring high precision and throughput motion control solutions.

For further information on this new product or others in our extensive product portfolio, call 1-215-728-6804 or e-mail Intellidrives at sales@intellidrives.com or go Intellidrive – Contact Us at: www.intellidrives.com/contact-us

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Is Your Workplace Safe? Find out with the safety Gotcha Stick!

safety gotcha stick

 

STI — Omron introduces the safety Gotcha Stick Safe Distance Scale. This three-segment safe distance stick accurately tests the allowable barrier opening size based on the distance from the point of operation. It features English measurements on one side, and Metric measurements on the other.

Although not officially adopted by OSHA, the safety “Gotcha Stick” is based on data from “A Review of Machine-Guarding Recommendations,” by Donald R. Vaillancourt and Stover H. Snook of the Liberty Mutual Research Center for Health & Safety. This data redefines the dimensions of the human arm for the purposes of machine guarding. The resulting new stick has been modified to include openings of less than 1/4 inch over the first 1/2 inch distance.

Guarding machinery by means of hard (fixed) barriers is one of the main ways of protecting personnel from point-of-operation hazards. The safety “Gotcha Stick” is the easiest means of verifying that openings in hard guarding will not allow the point-of-operation to be accessed by the operator.

With headquarters in the heart of Silicon Valley, STI was founded nearly 30 years ago and employs more than 350 people. STI has been selected twice by Forbes and three times by Business Week as one of the “world’s best small companies.” STI’s safety products are used to protect workers around machinery, automated equipment and industrial robots. Their products serve a wide variety of applications and markets, including semiconductor, automotive, electronics manufacturing, packaging and consumer markets.

To request the safety “Gotcha Stick” click here.
 
 
 
 
 

For a Safer Motion Control Workplace Use the Safety Laser Scanner From OMRON!

For a Safer Motion Control Workplace!

OMRON Motion Control Component - Safety Scanner

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Hoffman Estates, IL -Motion Control Automation and Safety -Motion Control Components and Systems – Small size, less weight and low-power consumption are extending operation time of battery powered systems like automated guided vehicles (AGVs). The OMRON Safety laser scanner OS32C covers all these requirements in collision avoidance, presence and intrusion detection applications. Maintenance is made simple since diagnosis is clear having LED displays.

OMRON Motion Control Component - Safety Scanner

 

Features:

  • Type 3 Safety Laser Scanner complies with IEC61496-1/-3
  • 70 sets of safety zone and warning zone combinations
  • Safety zone up to 4m and warning zone(s) up to 15m.
  • 8 Individual Sector indicators and various LED for clear status indication
  • Reference boundary function prevents unauthorized change of scanner position

 

OMRON Motion Control Component - Safety Scanner Data Sheet

OMRON Motion Control Component - Safety Scanner Brochure

 

To Down Load OMRON Safety Laser Scanner OS32C Brochure CLICK HERE

To Down Load OMRON Safety Laser Scanner OS32C Data Sheet CLICK HERE

For additional information on OMRON Safety laser scanner OS32C CLICK HERE

To subscribe to OMRON Newsletters CLICK HERE

To contact OMRON about this or other industrial products CLICK HERE

KEEP YOUR WORKPLACE SAFE! – GET A ‘GOTCHA-STICK” CLICK HERE

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Motion Control – Steinmeyer Tutorial – Ball Screws – Maximum Load!

Motion Control Components - Steinmeyer Cooled Ball Screws

 

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Tutorial presented by Steinmeyer – Their Ball Screws are specially manufactured for dynamic performance

BURLINGTON, MA –Motion Control Tutorial – Ball Screws – Maximum Load

There are five ways a ball screw may fail due to overload:

  • Excessive dynamic loading, which means the screw makes too many revolutions under a certain load resulting in material fatigue. This can be avoided by selecting a ball screw with sufficient dynamic load capacity (or by reducing the number of revolutions and/or reducing the load). This is the subject of the load capacity discussion.
  • Exceeding the static load capacity, which causes instant and permanent damage to the ball screw due to brinelling of balls and races, and prevents any further normal operation of the ball screw. Static load capacities are listed as technical data.
  • Buckling of the shaft under compressive load. Buckling load value depends on bearing method and free length of the loaded ball screw shaft.
  • Failure of the nut body or of the bolts that connect it to the slide. This may happen even before the static capacity is reached. Safe loads are discussed on the following pages.
  • Radial loads. It means the load capacities given in this catalogue apply only to pure axial loading. As there are always tolerances in the alignment of bearings and linear guideways, there may be a small amount of radial force, which should be minimized. Under normal conditions, a radial load less than 5% of the minimum axial load will not cause any problems. When considering a ball screw for use under radial load, please consult Steinmeyer engineers.

BUCKLING

There are several analytical ways to demonstrate safety from buckling. In machine design, the most frequently used is a simple calculation using formulas based on Euler equations.

Other, more accurate methods include non-linear FEM analysis and more involved mathematics. These methods are normally used in aerospace applications, where excess safety margins are not possible due to weight limitations. Please contact us if you require such an analysis.

Please CLICK HERE for a simple form of buckling analysis. Buckling

FRACTURE LOAD

Some ball screws cannot be loaded all the way to their static capacity. Screws with high dynamic load capacity (which might be selected to obtain a long enough service life at a much lighter load) will necessarily have a high static capacity. But the term “static capacity” is misleading, since the ball screw may actually fail due to fracture of the nut flange, nut body, or connecting bolts before reaching this load!

Please CLICK HERE for the maximum safe loads. Fracture Load

TECHNICAL TIP

A reasonable load for a ballscrew, which may be sustained for significant travel, is about 10% of its dynamic capacity.

A mean load of 10% of its dynamic capacity results in a theoretical life of 1 billion revolutions, which is the upper limit of the range where the life equation is valid. Mean loads of a reasonably sized ball screw will therefore be somewhat higher than this, but normally not exceed 20% of its dynamic capacity.

For short peak loads, the loading may be higher, but normally the loading of a ball nut with 2-point contact should not exceed 2.8 times the preload. And preload is around 5% – 10% of dynamic capacity.

As a rule of thumb, this all means the load range for a ball screw, to be used in a machine tool application, is really about 10% to 30% of its dynamic capacity. However Steinmeyer ball screws are used in many applications as force actuators where the loading is up to 100% of dynamic capacity but with low speed and acceleration. For example, they may be used to power injection molding machines, where high forces occur at reduced speed. Please consult our engineers for details.

Please CLICK HERE for information on Accounting for preload.

About Steinmeyer

Steinmeyer is the world’s longest continuously-operating manufacturer of commercial ball screws. In the realm of linear motion control, our company has become synonymous with precision, innovation, and exacting standards of quality.

Steinmeyer’s extensive product line is used widely in drive systems for industrial machines as well as precision positioning in optical instruments, medical devices, and other mechatronic applications. www.steinmeyer.com

For further information on Steinmeyer our extensive product portfolio, call 1-781-273-6220 or e-mail Rosmary Belt at rosmary.belt@steinmeyer.com or visit the Steinmeyer FMD group at: www.steinmeyer.com

 

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Need Help With Motion Control Marketing?

Go to DW Motion Control Marketing at

http://motioncontrolmarketing.com

For Product Releases that get published …

Brochures, Data Sheets, and Catalogs that are read …

Effective, Low Cost Marketing Plans …

Contact Don Wismann at 760-497-0776 or motioncontrolmktg@gmail.com

 

Don Wismann has been Marketing Motion Control Components exclusively for over 30 years!

Who better to market your products than someone who understands your products?

 

 

 

Motion Control – Low Profile, High Precision Motorized Cross Roller Linear Stages

Motion Control  Motorized cross roller stage

 

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Van Nuys, CA – Optimal Engineering Systems, Inc. (OES) offers a high precision series of low cost, low profile motorized single axis positioning stages. The compact AQ110 Series of four cross roller linear stages have travel lengths of 15 mm (0.590 in), 30 mm (1.181 in), 50 mm (1.968 in), and 75 mm (2.952 in). Open loop repeatability of all stages is 0.5µ using a 10 mirco- steps-per-step Step Motor Driver or just 0.25µ using a 20 mirco-steps-per-step Step Motor Driver. Precision ground lead screws with just 2µ of backlash and high precision cross roller linear travel guides assures repeatability of 5µ, and positional accuracy of 10µ.

Table sizes and loads of these linear stages are: AQ110-15 is 65 mm x 65 mm (2.559 in x 2.559 in) and 10 kg (22 lbs), AQ110-30 is 90 mm x 90 mm (3.543 in x 3.543 in) and 15 kg (33 lbs), AQ110-50 is 90 mm x 110 mm (3.543 in x 4.331 in) and 15 kg (33 lbs), and the AQ110-75 is 90 mm x 110 mm (3.543 in x 4.331 in) and 20 kg (44 lbs). Each of the tables has a pattern of 16 threaded mounting holes for the addition of custom tooling and the base has drilled and countersunk holes, for easy integration into new and existing applications.

There is a knob on the back of the motor for manual adjustments or it can be replaced with an incremental encoder. Options include: Servo motors, encoders, limit switches, and fully compatible multi-axis motion controllers. Additionally, any of AQ110 series of linear positioning stages can be ordered as a complete plug-and-Play system.

If longer travels are required, please consult our team of linear motion specialists at OES or consider one of the other stages in the AQ series of motorized single axis stages at http://oesincorp.com/motorized-linear-stages/low-cost-series/index.htm.

About OES Optimal Engineering Systems, Inc. (OES) is a manufacturer of motion control products including: Stepper motor controllers and drivers, solenoid electronics, and positioning stages and slides. Applications include: Animation, automated assembly systems, automation, CNC machines, flight simulation, inspection systems, linear and rotary stages, machine tools, medical devices, motion control camera boom systems, optical comparators, CMMs, pan-tilt gimbals, PCB assembly & inspection, pick-and-place, positioning stages, robotics, scanners, security cameras, telescope drive mechanisms, time-lapse photography and winders

Some of the industries OES serves are: Aerospace, Astronomy, Chemical, Communications, Educational Institutes, University, Colleges, Government Agencies, National Labs, Manufacturing, Medical, Metrology, Military, Motion Control, Museum, News Agencies, Semiconductor and Test Equipment. Optimal Engineering Systems, Inc’s. competitive advantage is its state-of-the-art in-house manufacturing facility in North America enabling OES to supply clients with custom designed orders or high volume just-in-time deliveries globally.

For additional information contact Customer Service at Optimal Engineering Systems, Inc. (OES) , 6901 Woodley Ave, Van Nuys, CA 91406; Tel: 888-7071-1826, +1 (818) 222-9200, E-Mail: sales@oesincorp.com or visit the website at http://www.oesincorp.com

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Motion Control Integrated Stepper Motor with EtherNet Available from Servo2Go!

Greenville, DE – Motion Control Components –  Servo2Go is pleased to offerf eight motion control integrated drive+motors from Applied Motion Products to our line of Ethernet and EtherNet/IP motion control products

The STM23 models fuse a high performance motion controller with 100 MBit Ethernet communications to a high torque NEMA23 step motor. Connecting to an Allen-Bradley ControlLogix, CompactLogix or MicroLogix PLC? EtherNet/IP is also available

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The STM23Q-2Ex provides 125 ounce inches of torque, while the longer STM23Q-3Ex produces 210 ounce inches. Both models are available with an optional 4000 count/rev optical encoder, safely housed inside, that can detect and prevent motor stalls using Applied Motion’s proprietary stall prevention algorithm. Our auto tuned digital current control provides smooth, quiet motion, while an advanced anti-resonance algorithm with electronic damping allows for maximum torque utilization, rapid acceleration, and fast settling times

Software applications can communicate with the STM23 in real time, using the SCL and Q languages over standard 100 megabit Ethernet cabling, addressing and protocols. Ethernet can transmit data at 100 times the speed of CANopen and more than 1000 times faster than RS-232 and RS-485. The number and types of devices that can share a network are practically unlimited.

Even if you are just programming a Q drive for standalone operation, the Ethernet option can be more convenient than chasing down a USB-serial converter and trying to remember which COM port it uses. Just plug the drive into your office network, install our free, easy to use software, and you’re ready for programming and configuration.

50 piece pricing begins at $371 US/ea. Delivery is 1-2 weeks.

For more information on the Applied Motion Products STM23 Integrated Step Motor with EtherNet from Servo2Go, click on the link below:

http://servo2go.com/product.php?ID=102267&cat

For further information on this new product or others in our extensive product portfolio, call 1- 877-378-0240 or e-mail Warren Osak at warren@servo2go.com or visit Servo2Go.com at: www.Servo2Go.com

Motion Control – Parallelogram Voice Coil Positioning Stage Is a Complete Positioning System!

 

 

Sunnyvale, CA, – — Motion Control Positioning Stage – The PVS-5.5 Parallelogram Voice Coil Stage from Equipment Solutions is a complete, compact high performance positioning system. This compact stage (37mm x 31 mm x 32 mm) weighing just 70 grams features a 5 mm clear aperture through the center of the motor and the friction free, flexure linking system. Non-linearity is <±0.5% throughout the stages 5 mm range of motion. PVS-5.5 Parallelogram Voice Coil Stage is ideal for optical focusing and micropositioning applications such as: Semiconductor, medical, optical testing, scanning microscopy, circuit board assembly, and micro manufacturing.

The PVS-5.5 Parallelogram Voice Coil Stage features a high force, frictionless voice coil motor and infinite life flexure system that provides superior responsiveness and accuracy (positioning resolution 75 nm) over conventional lead screw or belt drives and produces the least amount of electrical noise of any motor currently available. The stage can be mounted in a horizontal or vertical position and for easy integration tapped and clearance holes are provided in the base.An integral sub-micron linear displacement sensor with high bandwidth and low noise for high responsiveness and precise movements featuring frictionless optical technology completes this positioning system. This cleanroom compatible positioning system is low cost and uses ±12 V to ±24 V @ 1 A. The PVS-5.5 Parallelogram Voice Coil Stage is available with the Equipment Solutions, Inc. SCA814 Servo Controlled Amplifier, and to aid integration into a new or existing application CAD drawings are available on the Equipment Solutions, Inc, Website at http://www.equipsolutions.com.

 

Equipment Solutions, Inc. (ESI) is a provider of engineering and manufacturing services. ESI specializes in the design and production of automation and instrumentation products including motion control components and sub systems. ESI’s products range from galvanometer amplifiers with an integrated arbitrary waveform generator, to high-resolution displacement sensors, voice coil and stepper motor stages, amplifiers and controllers.
For additional information contact Jeff Knirck at Equipment Solutions, 1098 West Evelyn Ave. #102, Sunnyvale, CA 94086; Tel: 408-245-7161, Fax: 408-245-7160, E-Mail:info@equipsolutions.com or visit the Website at http://www.equipsolutions.com

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Motion Control – Hollow Core Linear Voice Coil Stages from MotiCont!

MotiCont-Motion Control Hollow Core HCDS Voice Coil Motor

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Van Nuys, CA – Motion Control – The high performance compact positioning voice coil driven linear stages are used in positioning applications where high speed, high acceleration or high accuracy is required.

The hollow core motorized linear stages are fully self-contained. Each stage utilizes a voice coil motor, a linear carriage system, an optical quadrature encoder feedback device and a home switch. The standard positioning resolutions of 1 micron through 29.95 microns are available for immediate delivery. Other resolutions are available upon request.

Motion Control Hollow Core Voice Coil Driven Stage HCDS-051-032-01 Series with Quadrature Position Sensor and Home Switch

  • Range of Motion: 0.97” (24.6 mm)
  • Efficient Force within First 0.750″ (19.1 mm) of Stroke
  • Positioning Resolution: 1 through 29.95 microns
  • Continuous Force: 4.9 lb (22.0 N) through 6.3 lb (28.2 N)
  • Intermittent Force: 15.7 lb (69.6 N) through 20.0 lb (89.9 N) at 10% duty cycle
  • Optional Return Spring
  • Cross Roller or Linear Ball Bearing
  • Built-in Home Switch
  • Quadrature Optical Encoder with Differential Outputs
  • Also Available Without Encoder
  • The stages may be stacked in XY, XZ and XYZ configurations.

Note: To meet the requirements of your motion control application these stages are available in variety of resolutions as stated. All stages also available without encoders.

 

Videos of Motorized Linear Stages:

Motorized Linear Stage By Moticont Two-axis Voice Coil Motor Stage by MOTICONT SINGLE-AXIS Positioning Linear Motor Stage by MOTICONT

For PDF Catalog of Voice Coil Stages from Moticont – Click Here!

For additional information contact MotiCont, “A Motion Company” at 6901 Woodley Avenue, Van Nuys, CA 91406, USA; Tel: , Fax: (818) 785-5713, E-Mail: moticont@moticont.com or visit the website at http://www.moticont.com

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