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Digital Signal Controllers

Microchip Technology, Chandler, AZ, has announced the dsPIC33FJ12MC family of motor control digital signal controllers. Hardware features include a motor control PWM with two independent clock sources for motor control algorithms — such as field-oriented control — and active power factor correction using a DSC and an analog-to-digital converter (ADC). The on-chip ADC and motor control PWM are also suitable for power conversion and LED lighting applications.

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Bearings

AST Bearings, Montville, NJ, offers a variety of bearings, bushings, spherical plain bearings, rod ends, linear bearing and slides, miniature and instrument bearings, and tapered roller bearings for rotary motion applications. The company also offers modified dimensional bearings in inch and metric sizes in materials such as chrome and stainless steel, plastics, ceramics, and anti-corrosive alloy composition. These products can be used in various aerospace applications, medical and dental equipment, power tools, X-Y plotters, motion control systems, and scientific miniature and micro-miniature instrumentation.

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Linear Slides

Fabco-Air (Gainesville, FL) has introduced block-style linear slides in 12-, 20-, and 32-mm bores with strokes from 1/2" to 10" and guide shafts from 3/8" to 3/4" diameters. An anodized aluminum body has a built-in repairable air cylinder and a combination of mounting holes to facilitate rigid mounting in tight spaces; counter-bored tapped-through holes on the bottom; and tapped holes on the rear and side with a slip-fit dowel hole and slot for alignment. The toolbar has counter-bored tapped-through holes on top, front, and bottom faces for tooling attachment. The front face has a slip-fit dowel hole and slot for repeatable tool alignment. Options include magnetic piston for position sensing, adjustable extend stroke, and a blank toolbar for custom hole pattern.

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Linear Positioning Stages

The SR linear positioning stages from H2W Technologies (Valencia, CA) are compact, lightweight, and have a small footprint. They offer speed of 6 m/sec, acceleration up to 12 g’s, zero cogging, high resolution to 0.1 μm, repeatability to ±1 μm, and load capacity to 25 Kg. The non-contact, three-phase brushless motors have continuous forces up to 733 N and peak forces up to 2444 N. They feature an ironless core winding, and the motor can be commutated either sinusoidally or trapezoidally.

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Motion Controller

PI L.P. (Auburn, MA) introduced the E-755 NEXLINE® ultra-high-resolution motion controller that is designed to drive NEXLINE® linear motor actuators, enabling the combination of long travel ranges and picometer resolution. The E-755 features 32-bit digital filters, 24-bit DAC resolution, integrated piezo amplifiers, fully programmable low-pass and notch filters, and non-volatile user settings and last-position data. It can be run in closed-loop and open-loop mode and in closed-loop operation linearity is achieved by polynomial linearization. The controller comes with a software package that includes LabVIEW drivers for automation of nanopositioning tasks. The low-noise, 24-bit D/A converters enable the controllers to provide picometer-level resolution in the short-range/dithering mode supported by the actuators.

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Single-Axis Controller

The microMAXR from Agile Systems (Waterloo, ON, Canada) is a single-axis controller that integrates motion control, servo amplifier, networking capabilities, and user I/O in a compact package. The microMAXR allows users to incorporate multiple controllers using a traditional connector or a backplane version that plugs into the user’s printed circuit board. The controller has Agile’s Peer to Peer network architecture, allowing the user to create individual distributed programs to interact with each other. With this control network scheme, register values are exchanged between controllers in a synchronized fashion, ensuring motion functions associated with each exchanged register value are executed at a defined point in time and synchronized between all axes in the system. Peer to Peer networking of motion tasks reduces the bandwidth requirement of the network connection between machine control and the motion system.

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Encoder Protocol

The BiSS™ Model C encoder protocol from Dynapar (Gurnee, IL) provides bidirectional communication between an encoder and a motor drive controller. Secondary data such as temperature, acceleration, alarm description, and safety information can be communicated without the need to stop collecting position data. The protocol can read/write data to the controller without switching from sensing mode to read/write mode, enabling the sensor to send secondary data along with position data in a real-time data stream.

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