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DIN Motion Controller

From Trio Motion Technology (Pittsburgh, PA), the MC302X DIN rail-mounted motion controller features two axes; the first can be configured in software for servo (with encoder feedback) or high-speed stepper control. The second axis may be either a reference encoder or a stepper axis. Differential line driver stepper outputs can be configured for standard simulated quadrature encoder outputs to synchronize multiple units. Each axis can run moves using linear or circular interpolation, electronic cams, and gearboxes. Two inputs may be configured for accurate hardware registration. The device operates from 40 mA to 24 V DC, and has four 24 V inputs and four bi-directional input/output channels built in with optical isolation. Other features include an RS232 programming port, and a user selectable RS232/485 port for peripherals. The controller is programmed using Trio BASIC.

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Ball Splines

Released from THK (Schaumburg, IL), the SLS/SLF Ball Splines feature caged technology, allowing for smooth motion. A synthetic resin cage cradles each ball, separating it from others, while spaces between rolling elements retain the lubricating grease to act as a lubrication system. The units feature a rigidity of ±10%. Outer shaft diameters are available from 15 to 100 mm. Low-noise options are available.

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Linear Actuator

From Exlar (Chanhassen, MN), the Tritex™ Series of electric linear actuators, combining a brushless servomotor, servo amplifier, and position control in one unit. Up to 500 watts of continuous power can be applied to the actuator’s brushless servomotor. The standard product is rated IP54 with optional IP65 rating for wash-down and fluid applications. Mountings include front flange, rear clevis mount, side mount, and trunnion mount. The unit is available in standard IEC metric dimensions. Other features are: 24 and 48 V DC power, 25" per second maximum linear velocity, 1,250 lbf maximum continuous thrust capacity (2,270 lbf peak), and low resolution incremental feedback. Customization is available.

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Ethernet Controller

Galil Motion Control (Rocklin, CA) released the DMC-40x0 Ethernet/RS232 controller family as part of the Accelera line, coming in 1- to 8-axis formats. Accepting encoder input frequencies up to 22 MHz and providing servo update rates up to 32 kHz, the line can complete program instructions in 40 microseconds. The device operates in a standalone configuration or can be interfaced with a PC via the Ethernet 10/100Base-T or RS232 ports. Memory is up to 510 symbolic variables, 16,000 array elements in 30 arrays, and application program space up to 2,000 lines × 80 characters. Mode of motion capability includes: point-to-point positioning, position tracking, jogging, linear and circular interpolation, contouring, electronic gearing, and ECAM. Other features include isolated I/O, eight uncommitted analog inputs and outputs, and PID compensation.

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DC Gearmotor

Midwest Motion Products (Watertown, MN) released the Model No. MMP-S28-400A GP81-046 BR-015 DC gearmotor. The device accepts any 24 V DC source. The gearmotor is reversible; the output is rated for 61 Nm continuous torque at 43 rpm and 100 Nm peak. Motor windings for 36, 48, 60, and 90 V are available. The integrally mounted fail-safe brake requires 24 V DC power and features a holding torque of 15 in-lbs. Mounting is accomplished with four “face mount” M-6 threaded holds, equally spaced on a 65 mm B.C. diameter. Dimensions are 3.2 (max diameter) × 13.3" long, and the unit has a keyed output shaft diameter of 19 × 49 mm long.

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Multi-Fabric Switching Enables New Architectures for Military Systems

With multiple switched interconnects gaining momentum in the embedded space, selecting just one to address a wide range of military systems requirements is not easy. Individually, switched fabrics such as Gigabit Ethernet (GbE), Serial RapidIO (SRIO), and PCI Express (PCIe) have their own particular technical merits, and each is poised to carve out a piece of the interconnect market. However, when combined in nextgeneration Serial Switched Backplanes (SSB) like VPX (VITA 46/48), multi-fabric switching can enable powerful new military architectures by leveraging ‘best of breed’ interconnect technology to address specific application requirements ( Figure 1).

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Multicores Affect Algorithm Choices

Design engineers soon will need to bridge the growing gap between hardware reality and software capabilities in the highperformance computing (HPC) realm as the use of multicore microprocessors grows. If your software development or sourcing plans haven’t anticipated these development situations, your applications may have a shorter life than you had planned. The 2006 version of technical computing “reality” is an inexpensive dual-core processor from AMD or Intel on a desktop system, or a dual- or quad-core RISC processor from Sun or IBM running on a server. In 2007, we should expect to see inexpensive quad-core processors from AMD and Intel, and processors with up to eight or more cores in 2008. These small symmetric multiprocessing (SMP) systems will be a far cry from the proprietary $500,000+ SMP systems of a few years ago. This technology transition has big implications for the “democratization” of computing power. On the horizon are four- to eightcore systems that cost only a few thousand dollars and sit on the desk of every design engineer.

Posted in: Application Briefs, Application Briefs

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