Motion Control

Nanopositioning Controller

PI, L.P. (Auburn, MA) has introduced the E-621.CR modular controller for piezo-driven nanopositioning systems that features high-bandwidth analog and networkable digital interfaces. The controller integrates a low-noise piezo power amplifier, a high-speed servo controller, sensor electronics for absolute-measuring capacitive nanopositioning sensors, and 20-bit A/D and D/A converters.

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Brushless Motor

Maxon Precision Motors (Burlingame, CA) has introduced the EC-16 sterilizable brushless motor that has been assembled so that the coils are outside the rotor, providing good heat dissipation. Steam sterilization is specified at 273 °F at up to 2.3 bar for 20 minutes. The motor can be sterilized at least 100 times in an autoclave. The diameter is 0.63" with a length of 2.2". Continuous output power is 40 watts, while maximum speed is 50,000 RPM. Ambient temperature range is -4 to 275 °F, and maximum continuous torque is up to 1.78 oz-in, depending on the winding. The motor uses high-energy samarium cobalt magnets for a mechanical time constant of 5 ms. A sterilizable gearhead is available in 55 ratios ranging from 3.8:1 to 4592:1 with a maximum input speed of 8,000 RPM.

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Rotary Transducer

SpaceAge Control (Palmdale, CA) has released the Series R rotary transducer that provides rotational measurements from 1 to 150 turns. The rugged device uses ThreadSensor™ technology for accurate and repeatable measurements in rotational sensing. Applications include potentiometers, encoders, resolvers, and synchros. Dual and quad redundancy features are available in the same package for failsafe or mission-critical applications.

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Automation System

Robohand (Monroe, CT) has announced the Smart Linear Actuator (SLA) modular automation system featuring DIRECTCONNECT™ technology enabling integration of Robohand pneumatic slides, grippers, and rotaries. The SLA includes integrated servo/pneumatic motion control, an online Web configurator, networking capabilities, and weld field immune electronics. The SLA servo slide is available in models SLA-90, SLA-120, and SLA-150, with stroke lengths ranging from 100 mm to 1,400 mm, and maximum stroke speeds from 1 mm/s to 1,100 mm/s.

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Ball Bearings

SKF USA (Kulpsville, PA) offers self-aligning ball bearings that allow for angular misalignment of the shaft relative to the housing without affecting operation. The ball bearings gain their self-aligning capability from a design incorporating two rows of balls with a common sphere raceway in the outer ring. They are available with cylindrical or tapered bores, in bore diameters ranging from 5 mm to 130 mm.

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Frameless Motors

Applimotion (Loomis, CA) has released ULT direct drive frameless motors in sizes up to 355-mm diameter, with 200-mm through holes, covering , and lasers.

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Miniature Digital Servo Drive

Elmo Motion control (Westford, MA) offers the “Whistle” digital servo drive with up to 500 watts of continuous power at 99% efficiency. The device weighs 1.76 ounces and measures 2 × 1.8 × 0.6". It interfaces to brush DC, brushless PM, and linear and/or voice coil motors. Power is provided by an external 7.5 to 95 VDC isolated DC power supply. A supply control algorithm enables the device to operate with one power supply.

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