Motion Control

Motorized Microscope Stage

PI, L.P. (Auburn, MA) has introduced the M-687 motorized microscope XY stage for inverted microscopes that features fully integrated, miniaturized ceramic linear drives. The stage is delivered as a complete system including a controller, joystick, and software. The self-clamping ceramic/ceramic linear motors in the XY positioner provide positional stability. No energy is consumed to hold position (no heat dissipation); there are no leadscrews to heat up due to friction during motion and cause drift, cooling down once the motion stops; and there is no creep caused by lubricant flow in the drive mechanism.

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Accelerometer

Dytran Instruments (Chatsworth, CA) has introduced the Model 3225M39 ultraminiature teardrop IEPE accelerometer with a sensitivity of 10 mV/g, designed to adhesively mount in spaces typically inaccessible to other types of accelerometers. The sensor has an overall height of 0.23" (5.8 mm), and weighs 0.95 grams. Featuring a quartz shear sensing element in a titanium housing, the accelerometer utilizes an integral three-foot coaxial cable assembly terminating to a 10-32 jack. It incorporates low-noise electronics, and has a frequency response of 1.2 to 10,000 Hz, making it suitable for modal analysis and Environmental Stress Screening (ESS) applications.

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Rotary Stages

Aerotech (Pittsburgh, PA) offers the CCS series rotary stages with integrated captured collet chucks that provide automated material handling for a wide range of materials and applications. Collet chucks used with the stages accept C-, D-, or Levin-style collets from machine-tool component suppliers in sizes supporting tube diameters from 0.1 mm to 27 mm. The stages feature a collet-chuck design that allows workpiece advance without manual realignment to compensate for axial tube motion during clamp/unclamp cycles. By moving the taper around the collet instead of drawing the collet into the taper, axial motion of the workpiece is significantly reduced, eliminating the need for part reregistration after tube advancement. The stages use direct-drive brushless motor technology that is optimized for 24/7 production environments, with no brushes and no gear trains or belts.

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Spindle Drive

The GP16 precision spindle drive from maxon motor (Fall River, MA) incorporates a spindle combined with a DC motor to transform rotary motion into axial motion. Gearheads, motors, encoders, and controllers are used to drive the spindles. It is available in a metric M6 spindle with a self-locking function, or a 5-mm ball screw for high load capacity and no self-locking feature. A central component is the axial bearing, which must withstand the high tractive and compressive forces of the spindle.

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Acceleration Sensor and Gyroscope

Bosch Sensortec (Reutlingen, Germany) has integrated two triaxial MEMS sensors in a single package. The BMI055, a combination of an acceleration sensor and a gyroscope, is an inertial measurement unit for applications with six degrees of freedom (6DoF). The elements — acceleration sensor, gyroscope, and software — are all one piece. Supplied in a LGA 3.0 × 4.5 × 0.95 mm package, the unit features resolution of 16 bits for the gyroscope, and 12 bits for the accelerometer. The measurement range of the sensors is programmable from ±125 °/s to ±2000 °/s for the gyroscope, and ±2 g to ±16 g for the accelerometer. I2C and SPI digital interfaces offer communication options. Along with the unit, a custom software solution combines measurement data of both sensors, providing optimized sets of data for various target applications. In combination with an optional geomagnetic sensor, the software enables the design of 9DoF applications.

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Linear Shaft Motor

The S605 linear shaft motor from Nippon Pulse America (Radford, VA) offers up to 3100N of acceleration force and a continuous force of 780N. The motor is designed for industrial applications requiring high force, high precision, energy efficiency, and/or high precision. Available with one of three types of windings (double, triple, and quadruple), the motor has an acceleration force range from 1000N to 3100N, and acceleration current from 34 to 35A. It has a shaft diameter of 60.5 mm, and is available with effective strokes between 200 and 2000 mm. Other features include a non-critical air gap of 1.75 mm, and a rated voltage of 240V. The motor is available in 18 different sizes, ranging from 4 mm to 60.5 mm. It uses all magnetic flux and minimizes heat generation.

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Rotary Actuator

Pangolin Laser Systems (Orlando, FL) has introduced the VRAD-1510 low-power rotary actuator based on a dual-coil, segmented stator design. It can be used in electromechanical applications such as automotive, industrial machinery, robotics, HVAC, and valve control. The actuator incorporates a magnetic spring and preloaded ball bearings. The design eliminates the need for mechanical stops on shaft rotation. The coils may be driven in series, in parallel, or separately. The actuator is equipped with front and rear shafts, allowing multiple points of attachment or the use of an encoder or position sensor for closed-loop operation. The stator design uses a series of asymmetrical, interleaved laminations that fit together in a way that prevents the introduction of air gaps to the motor’s magnetic field.

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