Motion Control – Custom Linear Mechanisms

Custom Linear Mechanisms from Steinmeyer …

Welcome to Where Precision Is.  You Can Turn to Steinmeyer for Design and Assembly of Custom Linear Mechanisms for your Precision Positioning Systems
Modern mechatronic systems consist of numerous precision components that must be assembled in complex configurations. Here, every detail counts.Steinmeyer Mechatronik, a division of August Steinmeyer GmbH, offers design and assembly services for a variety of demanding applications.We have deep experience in medical devices, laboratory instrumentation, optical inspection & semiconductor positioning. Our engineers can implement your finished design or optimize your concept.

Motorized Aperture Stage

Highest precision and compact design

The aperture control is used to adjust a pass-through window for a power laser and makes it possible to confine a laser beam to any rectangular format. The pass-through window is formed by means of four individual apertures, which are positioned by two drives. The height and width of the window can be adjusted almost infinitely from fully closed up to a size of 25 x 25 mm (maximum open); the smallest adjustment step is 50 nm. The beam center is fixed and cannot be changed.

Driven by DC motor and precision spindle with belt deflection

Since the pairs of individual apertures must be moved synchronously to adjust the pass-through window, two individual apertures each are moved by one spindle. The aperture control is driven by a DC motor and a precision spindle with belt deflection – a design with advantages: Owing to right-hand and left-hand threads on one spindle, two counter-rotating movements can be generated with one motor. In addition, the flat design requires only a short installation length in the optical beam path. Since the pairs of individual apertures must be moved synchronously to adjust the pass-through window, two individual apertures each are moved by one spindle. In this process, the parallelism of the apertures that are arranged on opposite sides deviates only by a maximum of 10 µm.

Trust Steinmeyer With Linear Mechanism Solutions:

    • We can assemble custom linear mechanisms of all sizes – from miniature actuators using 3 mm linear rails, to 3 m long lifting mechanisms.
    • As an added value, our engineers will offer innovative ideas for optimizing your design.
    • We can quote a completely assembled module, including sourcing of key components!
    • We offer our customers the advantage of a close working relationship, enabling us to provide you with the best possible solution to meet your needs.

Contact Person for Custom Linear Modules

Bruce Gretz

Phone: 781-273-6220

Bruce Gretz   bruce.gretz@steinmeyer.com

About Steinmeyer

In the realm of linear motion control, Steinmeyer is synonymous with precision, innovation, and exacting standards of quality. We are the world’s longest continuously-operating manufacturer of commercial ball screws, our main product line. As an added value, we offer customized linear modules from our highly innovative and experienced Mechatronik division. Designed and manufactured in Germany, our products are used globally in precision positioning for medical devices, lab instruments, and other mechatronic applications. Steinmeyer engineers will work closely with you to customize our offering to deliver a solution that meets your technical requirements and budget.

For further information on Steinmeyer’s extensive product portfolio, call 1-781-273-6220 or visit Steinmeyer at: www.steinmeyer.com/en/steinmeyer

For other Motion Control Components, Applications, and Technology from Steinmeyer go to: http://MotionShop.net
 

 

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Motion Control – One Piece ETX Linear Bearing/Pillow Blocks Can Be Used In Radioactive Environments!

LM76

E. Longmeadow, MA Motion — Control Components – Linear Motion – LM76 now offers one piece ETX Linear Bearing/Pillow Blocks that will not degrade in a radioactive environment! Machined from a solid block of self lubricating ETX, linear bearing-blocks have high strength, excellent wear resistance, low coefficient of friction, and excellent dimensional stability at higher temperatures As there is no other materials such as PTFE seals or lubricants these bearing-blocks are maintenance free. Custom designed for use in a nuclear power plant these linear bearing/pillow blocks travel on ceramic coated shafting (also supplied by LM76) completely submerged in radioactive water. Designed with a slight interference fit between bearing ID and shaft, contaminates are scraped from the shaft’s surface. The low frictional characteristics of ETX have little impact on drive force. They are now available in Inch and Metric sizes.

ETX bearing-blocks are also FDA/USDA/3-A Dairy compliant and are also are ideal for: Pharmaceutical, medical, food, and dairy processing applications.

EXT features a high continuous service temperatures up to 210°F (100°C) and offers good chemical and abrasion resistance, low moisture absorption, and resistance to staining. These ETX linear bearing-blocks with the slight interference fit keeps the bearing free from debris and bacterial contamination, are not affected by biological fluids, mild acids, can be washed down with cleaning agents, and steam cleaned.

Don’t need solid EXT bearing-blocks consider the FDA/USDA/3-A Dairy compliant electroless nickel coated or stainless steel pillow blocks with PTFE linear bearings and Snap-in EXT Scraper Seals which are available for closed linear bearings, and closed pillow and flange blocks.

LM76 also manufacturers a broad variety of FDA & USDA compliant bearings and shafting, in inch sizes of .25 inches to 1.5 inches, and a FDA & USDA compliant profile rail and slide system that can easily be integrated into new and existing applications. The bearing options include: Self-lubricating FDA & USDA compliant Teflon® composite bearings in a 304 stainless steel shell, and lower cost bearings with a ceramic coated shell and FDA & USDA compliant liner. Bearings are available in closed and open configurations, and are drop-in replacements for all inch sized linear ball bearings.

To follow the NEW Series from LM76, THE ENGINEERING EDGE! and learn about interesting Outside-of-the-Box solutions developed by LM76 to solve some interesting linear motion problems! CLICK HERE

About LM76

Founded in 1976, LM76 has been a leading designer/manufacturer of linear bearings, slides and linear motion systems. LM76 is renowned for its industry leading Minuteman PTFE Composite linear bearings. LM76 is a leading supplier of precision linear shafting: RC60, 300 Series Stainless Steel, and ceramic-coated aluminum shafting. LM76 also offers several FDA/USDA compliant linear bearings and slides for the food processing, pharmaceutical, medical, and packaging industries.

For additional information contact Mike Quinn at: LM76, 140 Industrial Dr., E. Longmeadow, MA 01028; Telephone: 413-525-4166, Fax: 413-525-3735 or E-Mail: mquinn@lm76.com or visit the website at http://www.lm76.com

For other Motion Control Components, Applications, and Technology from LM76 go to: http://AllMotionBlogger.com
 

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Motion Control – Redundant Coil Voice Coil Motor Available from H2W Technologies, Inc!

Motion Control Redundant Voice Coil Motor from H2W Technologies!
motion control redundant voice coil motor

 

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Santa Clarita, CA —–

When three-phase AC power is applied to the primary, a travelling electromagnetic flux wave is induced and moves relative to the primary. The wave induces an electric current in the conductive reaction plate. The induced electric current interacts with the magnetic flux to produce a linear force. The speed of the motor can be varied by changing the input frequency using an adjustable frequency drive.

Each coil pair operates as its own voice coil.

Redundancy is a requirement on many flight systems in a special case when one coil faults, the other can be used to make the motor “fault-resistant”.

Other systems require simplified circuitry which would not allow the change of current polarity in order to change the direction, in these cases each coil can be used to drive the coil in a single direction. The challenge in manufacturing a redundant coil is ensuring the same performance no matter the coil, which requires precise manipulation of the magnetic circuit design, and the precise coil layout to ensure the identical operation and constants for each coil. This will allow the controls to seamlessly switch between the two coils.

There are two ways of accomplishing this coil redundancy. The most common way would be to generate multiple coils operating on individual magnetic circuits. This requires a longer coil and multiple magnetic circuits; however this is the most robust design and the least vulnerable to damage or interference from the redundant coil. The NCC08-18-025-2R2C is an example of the multiple coil design. An alternate method, which allows for the most compact solution, would be a multi-filar wind. This method only requires one magnetic circuit, which is why the length is shorter. In this case multiple coils are wound in the same winding space.

About H2W Technologies, Inc.

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.

 

See Product: https://www.h2wtech.com/product/voice-coil-actuators/NCC08-18-025-1R2C”

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


For other Motion Control Components, Applications, and Technology from H2W Technologies, Inc. go to: http://MotionControlWeb.com
 

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Motion Control – Motion Control – Three-axis Gimbal Mount from OES Features High Resolution and Stability from OES!

motion control 3 axis gimbal mount

 

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Van Nuys, CA – — The New AU300-AER three-axis Gimbal Mount from OES (Optimal Engineering Systems, Inc.) features full 360O rotation of each axis. This three-axis gimbal mount handles loads to 10kg (22.5 lbs) and has a clearance of 300 mm x 300 mm, (11.8 in. x 11.8 in.) around the roll axis stage. The Azimuth stage rotary table is mounted on a large 360 mm (14.173 in.) x 360 mm (14.173 in.) x 13 mm (0.512 in.) plate with handles and has predrilled accessible mounting holes for easy integration into new or existing applications, and for increased stability. The AU300-AER three-axis Gimbal Mount is ideal for mounting: cameras, optics, lasers and instrumentation for scanning, tracking, positioning, pointing, and other applications.

The 3 axes: azimuth, elevation, and roll axes are drived by bi-directional stepper motors capable of microstepping, and has knobs for manual adjustments. The roll axis table measures 100 mm (3.937 in.) in diameter. The knobs may be replaced with optical encoders for position verification and closed loop positioning. Each axis features: low backlash worm gear drives and precision “V” groove and cross roller bearings for very high resolution of 3.6 arc seconds, and repeatability and positional accuracy to 36 arc seconds. Travel speed of each axis is 8 O per second. Electrical connections are made using three 9 pin DB-9 connectors.

The AU300-AER Motorized Three-axis Gimbal Mount can be ordered as a complete plug-and-play system with a multi-axis controller, joy stick, track ball, or keypad, and with a 30 mm thru hole in the roll stage.

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 sales team at: OES, 6901 Woodley Ave.; Van Nuys, CA 91406; Telephone: 888-777-1826 or +1 818-222-9200, FAX +1 818-436-0446 or E-Mail: sales@oesincorp.com or visit the website at http://www.oesincorp.com


For other Motion Control Components, Applications, and Technology from OES(Optimal Engineering Systems go to: http://MotionControlWeb.com

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Motion Control – LCR16 Series Linear Rotary Actuator, 35mm stroke, 24VDC operation with 5 micron encoder

Motion Control Actuator

 

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Vaughan, Ontario, Canada –The LCR16 from SMAC Moving Coil Actuators provides precision Z-theta motion within one small actuator, which is ideal for a pick, orient and place applications.  A wide variety of LCR16 linear rotary actuators are available with either direct drive or gearbox equipped rotary units.>

The vacuum-built-in shaft through the rotary motor is available for some models to prevent dust build-up in the unit.  These z-theta actuators can easily be programmed to control force/torque, position and velocity in all axes at the same time with feedback capability.  SMAC’s unique, patented “Soft-Land” function enables the unit to gently land on a delicate component with a controlled force to avoid damage of both the component and the actuator.

The actuator is constructed with a direct drive brushless servo motor.  It’s designed with linear guide built-in lubrication to offer long life cycle.  Moreover, it provides absolute control over: force/torque, position, acceleration and velocity.

Features include:

  • Direct drive brushless servo motor
  • Combined linear and rotary motions in a single unit
  • Fully programmable in force/torque, position and velocity
  • SMAC’s Patented ‘Soft-Land’ Technology
  • Self-lubricated linear guide
  • Low shaft run-out, 30µm (Lower run-out optional)
  • Vacuum through shaft prevents dust accumulation
  • MTBF 100 million life cycle
  • JMobile runtime included. Requires JMobile V2.8 or higher
  • Supports Corvina Cloud secure connectivity with full network separation
  • OPC UA Server and Client
  • Optional CODESYS V3 runtime with choice of EtherCAT, PROFINET, Ethernet/IP and POWERLINK

Information on the LCR16 Series Linear Rotary Actuator from SMAC can be viewed at:
https://www.electromate.com/assets/catalog-library/pdfs/SMAC/SMAC_LCR16_Linear_Rotary_Actuator_Brochure.pdf

About Electromate:

Electromate’s Core Purpose is to help Manufacturers build better machines using differentiated automation technology. They specialize in Robotic and Mechatronic Solutions for the Industrial Automation marketplace. Respected by customers as a premiere source for High Performance Automation and Motion Control Components & Systems, Electromate® specializes in AC & DC Servo and Stepper Motors & Drives, Motion & Automation Controllers, Positioning Systems & Actuators, Feedback Devices, Gearing Products and HMI’s & Operator Displays, all supported via extensive product selection, just-in-timedelivery, dedicated customer service and technical engineering support.

More on Electromate can be found at

Website: http://www.electromate.com

LinkedIn: https://www.linkedin.com/company-beta/209277/

Twitter: https://twitter.com/Electromate

Facebook: https://www.facebook.com/electromateindustrial/

Google+: https://plus.google.com/104057418684128701566

Blog: https://electromate.wordpress.com/

Electromate Best Blace to Work

For more information on the “Best Place to Work”CLICK HERE!

To view Electromate’s new corporate video CLICK HERE

For further information on this new product or others in our extensive product portfolio, call 1-877-SERVO99 (737-8699) or e-mail Warren Osak at sales@electromate.com or visit Electromate at: www.electromate.com

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Is Your Work Place Safe? Find out with the 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.

New VLM Servo Motors for value conscious applications!

motion control Kollmorgen Servo Motor

 

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Greenville, DE —-Motion Control Components – Kollmorgen has launched the VLM servo motor series to fill the gap between stepper and high-performance servo motors. The new VLM series synchronous servo motors offer OEMs, machine builders and end-users, an excellent price-performance proposition in the torque range of 0.5 to 4.5 Nm continuous and 16 Nm peak, with speeds of up to 6000 rpm. They also provide highly flexible configuration, proven quality and high reliability. Hence, they are a very useful solution for many applications where stepper or asynchronous motors are pushed to their limits but the expense and unused dynamics of high performance servo motors is not desirable.

The many standard design and configuration options built into the range allow engineers an optimal solution from the outset, to tailor their applications and machine requirements. Thus, installation time and cost is minimized and the price-performance ratio is further improved. The VLM series motors are available with standard frame sizes of 60 mm and 90-mm or NEMA 23 and 34 in each of the six most popular motor sizes and with a choice of twelve standard windings. The extensive possibilities for shaft and mounting facilitate seamless integration into virtually any system.

Feedback options include Digital Resolver (SFD), resolver, encoder and Hall sensors. VLM motors achieve continuous torque up to 4.5 Nm and peak torque to 16 Nm and can be used in power systems with 230 VAC. And of course, the new motors meet the ROHS Directives for CE and UL certification.

Information on the Kollmorgen VLM Brushless Servo Motors available from Servo2Go.com can be viewed at: https://www.servo2go.com/products/servo-motors-drives/servo-motors/ http://www.servo2go.com/product.php?ID=101027&cat=

These and other Motion Control Products are available through www.Servo2Go.com

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

For other Motion Control Components, Applications, and Technology from OES (Optimal Engineering Systems) go to: http://MotionControlWeb.com

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Motion Control – Low Profile XY Voice Coil Positioning Stage

motion control linear stage

 

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Santa Clarita, CA —– Motion Control – H2W Technologies introduces a high acceleration, voice coil driven, XY positioning stage with a precision bearing system, which minimizes the amount of pitch, yaw, and roll in the system. The voice coil stage (VCS06-010-BS-01-MXY) is a closed loop positioning system that can be used for positioning applications. The stage utilizes a custom low-profile design that utilizes a unique electromagnetic circuit design. The motor has a two-axis planar coil assembly that interacts with a common magnetic circuit. This circuit design allows for a minimal overall height of 2.085 inches [53 mm]. Each axis has a 0.62″ [15.8 mm] stroke; generate 0.75 lbs [3.3 N] of continuous force and 2.25 lbs [10 N] of peak force.

Each axis is guided by precision linear ball slide assemblies. It includes a one-micron resolution magnetic linear encoder on each axis. This design utilizes a moving coil, which has a lower moving mass that enables the highest possible acceleration. Voice coil positioning stages are ideal for applications that require quick, short moves with fast settling times.

Features:

  • – Low-profile
  • – Two-axis motion control
  • – High acceleration
  • – Compact footprint
  • – Custom strokes and force configurations available

 

About H2W Technologies, Inc.

H2W Technologies 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.

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.

See Article: http://www.h2wtech.com/article/dual-axis-closed-loop-linear-stepper-stage

See Video at Youtube: https://youtu.be/kEOt0BDd7hE

See Product: http://www.h2wtech.com/product/linear-stepper-stages/LSS-012-12-060-XY-01A-M”

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

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Motion Control Application – Maxon Drives Power – Hull Cleaning Robot for Large Ships!

Motion Control Application – Specially designed robotic crawler navigates around the underwater portion of a ship to remove the biofilm layers that accumulate there. As a battery operated, autonomous vehicle, component selection made up a highly critical part of the design and manufacture.

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The HullBUG provides grooming of the biofilm that collects on the
underwater portion of ships. © 2011 SeaRobotics

Fall River, MA — Motion Control Components Application – Toxic paint is used on the bottoms of large ships to prevent fouling, which is when a biofilm layer develops, decreasing the ship’s efficiency in moving through the water. The toxic paint continually leeches copper and other heavy metals into the underwater environment as well, causing damage to the organisms that live there. To further complicate the matter, the paint must be blasted off and replaced every 5 to 10 years, at which time literally tons of toxic waste is produced and needs to be disposed of. A ship that operates with a clean underwater surface free from fouling—even thin biofilm layers—will operate so much more efficiently that potential savings can easily reach over five percent in fuel costs alone. Without the concern for fouling, a ship’s underwater coating can be engineered for corrosion protection and longevity rather than its need to eliminate the potential for biofouling. If realized on all the ships operating in the world today the energy savings would greatly reduce the presence of greenhouse gases, as well.

To eliminate the requirement for toxic paint and its cleaning waste, there needed to be a method to “groom” the biofilm from the underwater portion of a ship. The idea was to create important changes for the ships being built as well as for the environment. That is where the HullBUG (Hull Bioinspired Underwater Grooming) concept originated. “The most important feature of the HullBUG is its small size,” according to SeaRobotics Research Engineer, Dr. Kenneth Holappa. “It is only about half a meter in length. This was a necessary design feature, needed to allow the vehicle to maneuver over the curved surface of the hull while continually maintaining close contact with the surface.

This close-up of the HullBUG clearly shows its sensor alignment
system that helps it keep on course while cleaning a hull.

© 2011 SeaRobotics

Because there are hazards associated with operating such a device underwater and in a harbor environment occasionally a HullBUG might be lost or destroyed during operation. Keeping the size and cost of the system low definitely helped to eliminate damage as a major obstacle to implementation. So, from the very beginning of the project, small size and low cost have been identified as being critical to the satisfactory implementation of the HullBUG project. As can be expected, this need to maintain a particular size and weight filtered into the selection of every component of the design.

Motion Control Components

The selection of the motors to drive the HullBUG involved a number of critical engineering constraints and compromises. SeaRobotics decided to make two basic models, one with wheels and one with tracks, and offer several options for keeping track of the system’s progress, which will be discussed later. Sizing of the motors, for example, required a calculated estimate of the power, speed, and torque characteristics of the manufactured devices. Determining factors included the resistance caused from pushing the grooming tool across the surface of the ship, the hydrodynamic resistance of the vehicle itself as it moved through the water, friction losses in the shaft seals that were used to protect the motors from the saltwater, and track or wheel friction dependent on which version of the unit was used.

In this close-up you can see the max-on EC45 brushless motor and
interface boards about to be safely mounted inside the machine.
© 2011 SeaRobotics

maxon motors offers a full line of fractional horsepower moving coil DC motors and brushless motors ranging in size from 6mm to 90mm, and from 30 mW to 500 watts. They also offer gearheads, controllers, and accessories. “The breadth of their product line and quality of their service helped us to feel comfortable that we had selected the right partner,” Ken said. Flat motors manufactured by maxon Precision Motor provide long life along with their low profile package. The entire EC series of brushless motors are electronically commutated, which enables them to have extremely long motor life since there are no mechanical brushes to wear out. The motors incorporate ball bearings or ruby bearings that also add to the longevity of the motors, especially needed in such harsh conditions. The flat motors were designed specifically for robotics applications where size and weight are important selection criteria. The EC45 flat motors selected for the HullBUG are very efficient and weigh only 75 grams. Continuous output power is 30 watts, while the maximum speed is 10,000 rpm (much faster than what was needed for this application). The important specification for this application was torque. Even under the potentially harsh environments that the HullBUG would be engaged in, the EC45 offered a maximum continuous torque up to 56.2 mNm depending on the winding chosen by the user. The Maxon brushless motors are built to IP54 standards, which was important to the application. Furthermore, the motors were also available in the system voltage that SeaRobotics required for the HullBUG application.

According to Ken, “The large load capacity of the shafts of the GP42 gearhead allowed the wheels to directly mount to the gearhead shaft, greatly reducing the complexity of the overall design of the system.” Gearheads manufactured by maxon are available in a wide range of ratios to enhance speed reduction and/or torque multiplication dependent on the needs of the user’s application. Concentric input and output helped to facilitate simpler and more direct mounting arrangements, as well.

Given that the HullBUG vehicle was to be completely autonomous, it had to be designed in such a way as to operate for many hours on batteries (cables would simply get in the way of the grooming operation). In order to maximize battery life, the grooming of the biofilm had to be performed in the most efficient manner possible. Navigating in a random pattern may eventually get the job done, for instance, but not in a reasonable amount of time. Plus, a typical ship presents a very large underwater surface, often as upwards of three thousand square meters. To keep this amount of area groomed it is expected that a user would employ multiple HullBUG vehicles to operate at the same time and, consequently, require a method of acquiring sophisticated coordinated navigation.

Navigating the HallBUG

A toolset of navigation modes has been created to allow multiple HullBUGs to efficiently groom a ship by dividing the ship’s underwater surface into regions. Numerous algorithms have been incorporated to accurately groom the ship in steps down to the turn of the bilge. Additional algorithms and associated sensors are used to allow efficient grooming of the flat bottom of the ship. Miniature acoustic ranging sonar (MARS) is also an option for navigation control of the HullBUG. This is where a very small close range, pencil beam sonar was specifically developed to allow the vehicle to “see” an upcoming wall or cliff condition such as bilge keels and bow thrusters. Yet another mode of navigation uses a MEMS rate sensor for navigation information. Another feedback mode uses encoder based odometry. Hall sensor feedback from the motor is used as an encoder signal to establish an accurate estimate of odometry. Hall sensors were used instead of optical encoders because of size and cost. The Hall sensors provide better than 1mm accuracy in the measurement of odometry with the motor/gearhead combination chosen.

Ongoing Software Development

An autonomous vehicle is often software heavy in terms of engineering efforts once you’ve selected and implemented the proper motion control system. Getting smooth reliable navigation maneuvers that result in accurate positioning in a widely varying environment was one of the more difficult challenges for the design team. Multiple layers of software were necessary for handling the number and variety of possible events that can occur during grooming. And, the proper organization of the control logic to allow extensibility of navigation behavior was the most difficult part of this complex system. “Software development will continue to be an ongoing effort even after the years already put into it,” Ken said. “Though the vehicle is completely operational, there remains a considerable amount of on-ship testing to be done.” As the project moves forward and into the field, there will no doubt be additional issues that will crop up and need to be addressed, as well. Even now, the vehicle must be able to reliably accomplish its task in a hostile environment and in an unmapped terrain. Then it has to be able to return to the waterline of the ship for retrieval.

This operation must be done repeatedly for days, months, and years, and with multiple systems in the water at the same time. Although this sounds as though it is overly difficult, according to Ken, “A technician was recently trained to use the vehicle and was fully competent within a short period of time. The user interface was borrowed from SeaRobotics’ Unmanned Surface Vehicle (USV) product line and presented an intuitive graphics-driven interface that has hundreds of hours of use by many different customers.” The vehicle is operational and the navigation software is working. The next primary focus will be the structuring of the interface to improve ease of use and allow non-engineering personnel to manage operations.

maxon manufactures a wide variety of EC flat motors for different
kinds of applications. © 2011 maxon motor

Contact maxon for more details info@maxonmotorusa.com

Comprehensive documentation and software are included with every delivery, and are also available for you to download from our website at www.maxonmotor.com.

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For other Motion Control Components, Applications, and Technology from Maxon Motor go to: http://Automation-Blogger.com
 

New VLM Servo Motors for value conscious applications!

motion control Kollmorgen Servo Motor

 

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Greenville, DE —-Motion Control Components – Kollmorgen has launched the VLM servo motor series to fill the gap between stepper and high-performance servo motors. The new VLM series synchronous servo motors offer OEMs, machine builders and end-users, an excellent price-performance proposition in the torque range of 0.5 to 4.5 Nm continuous and 16 Nm peak, with speeds of up to 6000 rpm. They also provide highly flexible configuration, proven quality and high reliability. Hence, they are a very useful solution for many applications where stepper or asynchronous motors are pushed to their limits but the expense and unused dynamics of high performance servo motors is not desirable.

The many standard design and configuration options built into the range allow engineers an optimal solution from the outset, to tailor their applications and machine requirements. Thus, installation time and cost is minimized and the price-performance ratio is further improved. The VLM series motors are available with standard frame sizes of 60 mm and 90-mm or NEMA 23 and 34 in each of the six most popular motor sizes and with a choice of twelve standard windings. The extensive possibilities for shaft and mounting facilitate seamless integration into virtually any system.

Feedback options include Digital Resolver (SFD), resolver, encoder and Hall sensors. VLM motors achieve continuous torque up to 4.5 Nm and peak torque to 16 Nm and can be used in power systems with 230 VAC. And of course, the new motors meet the ROHS Directives for CE and UL certification.

Information on the Kollmorgen VLM Brushless Servo Motors available from Servo2Go.com can be viewed at: https://www.servo2go.com/products/servo-motors-drives/servo-motors/ http://www.servo2go.com/product.php?ID=101027&cat=

These and other Motion Control Products are available through www.Servo2Go.com

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

For other Motion Control Components, Applications, and Technology from Servo2Go go to The ORIGINAL: http://MotionControlBuyersGuide.com

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