Motion Control

Torque Motor

ThinGap (Camarillo, CA) has developed the first member of a new motor family of high peak torque density brushless PM motors that reach over 20 Nm/Kg. The frameless LSI 105 torque motor model is 105 mm OD (4.125 inches) and 25.4 mm (1.0 inch) long. Continuous torque reaches over 2Nm (283 oz-in) in typical applications. The motor has torque ripple of less than -1%, and zero cogging. A frameless configuration is combined with large ID through-bores to ease assembly into OEM motion products. The efficient potted winding and thermally conductive structure provide heat transfer in enclosed places, and the motors also work with active cooling systems such as cooling loops or oil filled assemblies. Adjusting windings are available that cover common bus voltages and speed requirements.

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Accumulation Chains

A range of accumulation chains offered by iwis drive systems, LLC (Indianapolis, IL) are used for conveying, accumulating, and separating goods in logistics and material handling applications. The chains, which feature low-friction rollers, are available in different versions. These include chains with offset accumulation rollers for optimized load distribution, maintenance-free Megalife accumulation chains with nickel-plated plates and pins for lubricant-free operation, accumulation chains with protection for fingers and small parts for increased machine and personal safety, and side-bow accumulation chains with offset accumulation rollers for conveying systems with extremely small bend radii.

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Gear Motors

Yaskawa America, Inc. (Waukegan, IL) created a line of gear motors with a new set of gearheads designed to pair precisely with the company's Sigma-7 servo motors. The gear motors are rated from a low of 50 watts to as high as 15 kilowatts. Five different gear ratios are available, ranging from 3/1 to 50/1. The motors have precision helical gearing with a 40% greater tooth surface area; an enhanced system of bearings, including 45% larger planet bearings; and balanced, concentric shaft couplings to minimize vibration during high-speed operation and reduce the inertia of the gear motor system.

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XYZ Piezo Stages

The QNP3 series XYZ piezo positioning stages from Aerotech, Inc. (Pittsburgh, PA) combine sub-nanometer resolution, high dynamics, and good geometric performance in a compact three-degree-of-freedom (DoF) package. They have a 40 mm × 40 mm clear aperture with closed-loop travels up to 100 µm × 100 µm × 10 µm (open-loop travels to 120 µm × 120 µm × 12 µm). QNP3 piezo stages use an FEA-optimized precision parallel-kinematic flexure and metrology design to ensure multi-axis accuracy, high stiffness, and long device life. The capacitive sensor parallel-metrology design directly measures the output of the positioning carriage, delivering sub-nanometer resolution, linearity errors better than 0.01%, and single-digit nanometer repeatability. An optional mounting plate provides direct mounting to English or metric breadboard optical tables, and a solid tabletop is also offered.

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Accelerometer Modules

Model 2210 Series accelerometer modules from Silicon Designs, Inc. (Kirkland, WA) can measure on one, two, or three orthogonal axes when combined with the company's Model 2330-BLK triaxial mounting block. The mounting block can mix and match up to three single axis modules in similar or different g-levels. The low-noise, single-axis Model 2210 accelerometer modules integrate a MEMS variable capacitance accelerometer chip with high-drive, low-impedance buffering. G-force levels range from 2 to 400. Output scale factor is independent from the supply voltage of 8 to 32 V. At zero acceleration, differential output voltage is nominally 0 VDC; at full scale, ±4 VDC. Sensing elements of the Model 2210 are packaged within a lightweight, anodized, epoxy sealed aluminum housing with a total footprint of one square inch.

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Miniature Accelerometer

PCB Piezotronics, Inc. (Depew, NY) introduced the UHT-12™ miniature accelerometer for applications that demand minimal sensitivity change across a wide temperature range. Model 320C53 has a sensitivity of 1 mV/g and Model 320C52 has a sensitivity of 10 mV/g. Both feature a UHT-12 sensing element to provide stable sensitivity over large thermal shifts. The sensors weigh 1.85 grams with a size of 9.6 mm × 17.3 mm. They are hermetically sealed in a titanium housing, feature thru-hole mounting, and attach to test structures with an insulated mounting screw. Both models have an operating temperature range of -100 to +325 °F (-73 to +163 °C).

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