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Fault-Tolerant Motion Control
A comprehensive and detailed article reviews servo systems. In particular, the development of quadrature encoder feedback paths that tolerate mechanical and electrical faults. Among the topics of discussion: Controller receiver circuit design; PC-board receiver circuit layout; and encoder signal cable/termination.
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A Rotating Hall Effect Position Sensor
This non-contact Hall effect sensor provides absolute position feedback through 360 degrees of rotation, at speeds to 300 rpm. The sensor's compression-molded, rotating neodymium disc magnet generates a strong magnetic field, ensuring reliability and accuracy. Output can be either analog or PWM.
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Talking Slides and Bearings
Four industry experts sit down with editors from Motion System Design to discuss what system designers need to know about these components. Topics include what slides and bearings contribute to productivity; specifying, sizing, and applications; worst-case scenarios of incorrect installation; and what would be the ideal slide or bearing design.
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Water? Cement Dust? No Problem
A producer of fiber-cement plank siding for homes needed to support and guide a cross-cutting water jet head. Despite water spray and cement dust, a belt-driven, corrosion-resistant linear actuator system has outlasted other configurations. The travel length in the installation is 172 in., speed is 73 in./sec with 1g acceleration, and the load is 20 lbs.
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Faster Delivery of Linear Bearings and Shafting
Danaher Motion
In stock now for fast shipment in the Midwest and New England are the most popular Thomson linear bearing components and shafting through a new manufacturer's stocking program. Includes cut-to-length and machined 60 Case Shafting; most popular inch and metric "A", Super, and SuperSmart bearings, matching pillow blocks, and seals.
View all our featured products...
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New Linear Magnetic Encoder Range Brings Additional Performance, Durability, and Value
Renishaw
The LM10 linear encoder joins Renishaw's proven family of rotary magnetic encoders. The LM10 brings 100 m travel and fit-and-forget reliability to demanding high-speed, precision applications. Solidstate, non-contact design features compact readhead. Renishaw — creating new products that help businesses reduce process times while maintaining quality. Learn more about this and other Renishaw product here...
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Use Your Intelligence
While not suited to all applications, intelligent drives can store data, reduce wiring, and even replace motion control cards in some applications. Designers will find these digital drives good for single-axis motion, or even series axis motion (A axis, then B axis, etc.). Input may come from a range of feedback devices.
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Keep Pace with Changing Demands
Four motion control system manufacturers answer the question: "How are the needs and demands of motion control systems and components changing?" Read what is being done to offer greater energy efficiency. Smaller motors, regenerated power, encoders, eliminating gear reducers, and minimizing idle time are among the developments discussed.
For more on this subject, subscribe to the GlobalSpec e-Newsletter, DirectU2 The world of Drives.
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Actuators in Diesel Injector Testing
Moving coil actuators (MCA) are helping one manufacturer of diesel injectors to reduce emissions. The actuators determine the spring characteristics in the injectors. The coupling of standard programmable force control characteristics to a sub-micron resolution encoder feedback has ensured that "the measurement of spring rates and deflection are carried out with great accuracy and repeatability."
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Away from the Shelf
Engineering and designing new products often entails reinventing the wheel. The cause may be due less to fitting pieces within a package requirement, as much as achieving a lower cost. Today's array of available online catalogs makes these resources a good place to begin sourcing custom components for a system.
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ION® Digital Drive — for Motion Control
Performance Motion Devices, Inc.
The ION™ Digital Drive is a compact module that provides high-performance motion control, networking, and power amplification for DC brush, brushless DC, or stepper motors. ION provides high-power density in a rugged form factor performing profile generation, servo compensation, stall detection, FOC, and much more.
From Performance Motion Devices.
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SX25A20 Servo Amplifiers
Advanced Motion Controls
Advanced Motion Controls announces the availability of their new SX family of servo amplifiers. The SX25A20 outputs 25 Amps peak 12.5 Amps continuous and operates off 60-190 VDC (other voltage and current ranges are available). These amplifiers accept two sinusoidal command signals with a 120 degree phase shift, generated from an external controller.
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A Better Job Search by Design
Dice
DiceEngineering.com offers thousands of quality engineering jobs at top technology and engineering companies. Find jobs in your area of expertise.
Search now.
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The Princeton Review, a resource for the college-bound, asked more than 120,000 students to rate their happiness and the quality of teaching at their schools. The resulting Best 366 Colleges list identified a group of 20 schools rated as having the worst professors, and included seven engineering institutions. Does this mean that there is a crisis in engineering education? Find out what was found by editors of Design News magazine.
What do other engineers think of this?
See for yourself at
CR4 — GlobalSpec's Engineering Community.
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If Batman Had a Family…
…he might be driving this mini-van rigged with a jet turbine. Note the nifty system that pops down the rear window while moving back the jet so its dual exhaust nozzle can extend out. The vehicle reportedly can go 96 mph in less than eight seconds, but there doesn't seem to be any notes about how to keep gear tied down to the roof rack.
What do other engineers think of this?
See for yourself at
CR4 — GlobalSpec's Engineering Community. |
Share Your Thoughts . . . Join a Conversation About This Month's Topic...
Seeking Ideals
What improvements would you like to see to the design of slides and bearings? Have you experienced a situation where a solution had to be created from scratch?
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