Motion Control

Coming Soon - Magnetic Motor-Feedback Kits – A New Way to Improve Performance and Reduce Costs

Today’s motor-feedback systems generally fall into one of two categories: high performance and very expensive or low cost, but lacking performance and features.

Posted in: Upcoming Webinars, Motors & Drives, Sensors

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Control Scheme Improves Motor Operation and Interaction

A team of researchers from the Polytechnic University of Bari, Italy, is working to improve how industrial electric drives operate. They propose a new control scheme that will not only improve motor operation, but also how the motor interacts with other systems.

Posted in: News, Motion Control, Motors & Drives, Mathematical/Scientific Software, Simulation Software

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Tool Helps Design Soft Robots That Can Bend and Twist

Designing a soft robot to move organically — to bend like a finger or twist like a wrist — has always been a process of trial and error. Now, researchers from the Harvard John A. Paulson School of Engineering and Applied Sciences and the Wyss Institute for Biologically Inspired Engineering have developed a method to automatically design soft actuators based on the desired movement.

Posted in: News, Implants & Prosthetics, Motion Control, Robotics, Computer-Aided Design (CAD), Software

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The Basics of Encoder Selection

Positioning: Resolution and AccuracyAn application’s required positioning resolution dictates the choice of encoder resolution. A well-tuned system can maintain the position within one encoder state (quadcount). Therefore, the encoder resolution in quadcounts (states) should at least correspond to the maximum permissible positioning error. Depending on the response time of the system, a higher encoder resolution should be chosen for the controller to detect deviations faster and counteract quicker.

Posted in: Articles, Motion Control

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How To Substantially Reduce Encoder Cost While Gaining Functionality With Multi-Turn Rotary Position Sensors

Many applications require rotation counters that can measure angles greater than 360º. However the low-cost 10-turn potentiometers most design engineers are familiar with can’t always meet user requirements for resolution and reliability. As an alternative, optical absolute encoders are too expensive for many applications. These solutions require a continuous power supply or they will lose count when power is restored. Also, geared technology/rotation counters are subject to significant wear.

Posted in: White Papers, Motion Control, Machinery & Automation, Robotics, Data Acquisition, Sensors

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Airfoil-Shaped Fluid Flow Tool for Use in Making Differential Measurements

Researchers at NASA’s Marshall Space Flight Center have developed a suite of adaptable flow measurement devices that can be easily installed without compromising the structural integrity of existing conduits. With their simple installation procedures, the devices can be removed or exchanged without difficulty, allowing for temporary or extended use. The design is in-situ and self-contained, taking measurements from within the conduit, thereby offering more accuracy and allowing for opportunities to modify system operating parameters. Some of the designs can be used to mix the flow or inject a second fluid into the stream.

Posted in: Briefs, Mechanical Components, Mechanics, Fluid Handling

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Piezo-Actuated, Fast-Acting Control Valve

The ability of this valve to throttle makes it suitable for regulators and cold gas thrusters.High-power electric propulsion systems have the potential to revolutionize space propulsion due to their extremely high performance. This can result in significant propellant savings on space vehicles, allowing the overall mass to shrink for launch on a less expensive vehicle, or to allow the space vehicle to carry more payload at the same weight. Many electrical propulsion systems operate in pulse mode, pulsing hundreds or thousands of times per second. Creating reliable valves that can operate in pulse mode for extremely long periods and at low power is critical in these applications. Current solenoid valves have difficulty achieving the life requirements. In addition, a valve with the ability to throttle has the potential to simplify the entire propulsion system by eliminating the need for pressure regulators or latching valves.

Posted in: Briefs, Mechanical Components, Mechanics, Fluid Handling

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