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Graphite/Cyanate Ester Face Sheets for Adaptive Optics

Unlike glass face sheets, these would be nearly unbreakable.It has been proposed that thin face sheets of wide-aperture deformable mirrors in adaptive-optics systems be made from a composite material consisting of cyanate ester filled with graphite. This composite material appears to offer an attractive alternative to low-thermal-expansion glasses that are used in some conventional optics and have been considered for adaptive- optics face sheets.

Posted in: Physical Sciences, Photonics, Briefs

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Protecting AC Motors From Destructive Shaft Currents

The use of variable-frequency drives (VFDs) to control AC motors has increased dramatically in recent years. In addition to low operating cost and high performance, they save energy. Today, the challenge facing system designers and engineers is to minimize damage to AC motors from shaft current.

Posted in: Features, Motion Control, Articles

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Getting on the Right Motion Bus

As modern machines have become more advanced, the complexity involved in motion control has escalated. Today, servos have replaced cams and gears on machines and multiple axis of synchronized motion control have become commonplace. Distributed motion control requires busses able to handle rigid jitter and timing demands including:

Posted in: Features, Motion Control, Articles

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Integrated Motor Control Meets Aviation Needs

The trend in aircraft design is toward more efficient brushless DC motors. A integrated motor drive module for brushless DC motors from International Rectifier (El Segundo, CA) reduces the effort of programming the motor control and simplifies certification. Because the device is configured for sensorless field oriented control, the elimination of Hall sensors improves reliability while reducing component count. It enables the aircraft to achieve greater fuel economy and lower maintenance costs.

Posted in: Features, Motion Control, Articles

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Custom inserts solve reel torque problems

As a leading supplier of fishing equipment and accessories, Penn Fishing Tackle Manufacturing Co. provides customers with high-quality, competitively priced, cutting edge products that meet the highest possible industry standards.

Posted in: Applications, Motion Control, Application Briefs

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Configurable Components Ease Sourcing For Machine Company

ABCO Automation, Greensboro, NC, has consistently decreased costs and increased profits by looking for new ways to source custom components used in machine builds.

Posted in: Applications, Motion Control, Application Briefs

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Motor Control Chip

The Magellan programmable motion processor chip from Performance Motion Devices (Lincoln, MA) controls any combination of DC brush, brushless DC, microstepping, or pulse and direction motors. Each controlled axis supports profile generation, servo loop closure, PLC-style signal manipulation, and motor signal generation. Advanced features include programmable PID filters with velocity and acceleration feed-forward, 32-bit position error, and 50 microsecond loop time. Selectable profile modes include S-curve, trapezoidal, velocity contouring, and electronic gearing.

Posted in: Products

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