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Lightweight Internal Device to Measure Tension in Hollow- Braided Cordage
System, Apparatus, and Method for Pedal Control
Dust Tolerant Connectors
Foldable and Deployable Power Collection System
Iodine-Compatible Hall Effect Thruster
Development of a Novel Electrospinning System with Automated Positioning and Control Software
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Linear Positioning Stages

Mini-MAG precision linear positioning stages from Dover (Boxborough, MA) are available with a complete controls package. Users can combine a Mini-MAG linear motor stage with a board-level, single-axis servo drive for integration into a control cabinet, or a Kollmorgen AKD™ servo drive for single- or multi-axis applications with a graphical user interface for setup and programming, and realtime performance feedback. Both options provide Ethernet communication for data acquisition.

Posted in: Products, Motion Control

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Linear Actuator

BEI Kimco Magnetics (Vista, CA) has introduced the Model LA100-93-000A high force linear actuator with a peak force of 500 pounds. It features a continuous force of 292 pounds with 2" total stroke. Other features include semi-housed construction with built-in shaft and bushings that orient the coil assembly concentric to the field assembly. The unit measures 10" in diameter and 9.3" long at mid-stroke. The LA100 is suitable for use in applications that require an actuator force of 500 pounds and high speed.

Posted in: Products, Motion Control

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Brush Motors

Crouzet, a brand of Custom Sensors & Technologies (San Diego, CA), has introduced the DCmind Brush range of direct-current brush motors. The motors, even under full load, offer a range of gearboxes and accessories. The new motors have a noise level of 35 db. The motors are available in 15-, 25-, and 55-Watt configurations with a 42-mm diameter, and 55 and 104 Watts with a 63-mm diameter. They support 12, 24, and 48V power supplies.

Posted in: Products, Motion Control

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Simulation of Fluid-Structure Interaction in Hydraulic Pump Design

Axial pumps with cam-driven commutation units — so-called PWK pumps — emerged as a result of a research project conducted in the Department of Hydraulics and Pneumatics at the Gdansk University of Technology. As for all axial hydraulic piston pumps, several cylinder chambers are positioned around the rotating shaft of an axial pump with cam-driven commutation units — called PWK pumps. The rotation of the shaft and the attached swash plate leads to movement of the pistons that alternately decreases and increases the fluid volume of the chambers. A window — which is part of the control sleeve or commutating bushing — connects the chamber between the pistons with the low-pressure and highpressure intake and outtake channels.

Posted in: Articles, Motion Control

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Motion Controllers as Data Acquisition and Testing Tools

Manufacturers often need to test their products to verify that they meet customer specifications, and provide the data that verifies specification compliance. This is particularly true when government contracts are involved, public money is being spent, and public safety is an issue. Often, separate electronic subsystems are used to apply the stimulus and measure the results, but if the same module that applies the stress can also record the response, more cost-effective testing systems can be built. An added capability that is often overlooked by material strength and durability test system designers is the power of some motion controllers to also serve as data acquisition support or input devices.

Posted in: Application Briefs, Motion Control

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Compact, Low-Force, Low-Noise Linear Actuator

This actuator has potential uses in military and automotive applications. Actuators are critical to all the robotic and manipulation mechanisms that are used in current and future NASA missions, and are also needed for many other industrial, aeronautical, and space activities. There are many types of actuators that were designed to operate as linear or rotary motors, but there is still a need for low-force, low-noise linear actuators for specialized applications, and the disclosed mechanism addresses this need.

Posted in: Briefs, Mechanical Components, Motion Control

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Ultra-Compact Motor Controller

Applications include industrial robotic arms, industrial machinery, and automobiles. This invention is an electronically commutated brushless motor controller that incorporates Hall-array sensing in a small, 42-gram package that provides 4096 absolute counts per motor revolution position sensing. The unit is the size of a miniature hockey puck, and is a 44-pin male connector that provides many I/O channels, including CANbus, RS-232 communications, general-purpose analog and digital I/O (GPIO), analog and digital Hall inputs, DC power input (18–90 VDC, 0–l0 A), three-phase motor outputs, and a strain gauge amplifier.

Posted in: Briefs, Mechanical Components, Motion Control

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