Motion Control

Rail Brakes

Profile Guide rail brakes from Nexen Group (Vadnais Heights, MN) are available in a range of sizes from 15 to 45, and provide engagement at 0.049 to 0.080 seconds. They provide static holding force to 2,600 N (585 lbs.), and can be combined to provide higher holding forces. The brake is suited for holding a load in position while failed reducers or motors are replaced. They also allow for the use of smaller drive systems because the brakes position and hold a load that might otherwise overpower the drive system. The brakes clamp onto the center of profile guide rails to provide positive braking and holding in all axes without touching the bearing surface of the rail.

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Slide System

Velmex (Bloomfield, NY) offers the Parallel-Coupled BiSlide System for long traverses and larger loads. The system features two identical BiSlide assemblies coupled with a timing belt to drive synchronous operation. It can handle loads to 600 pounds and is available in standard lengths up to 80 inches. The assembly is available in both manual and motor-driven models. The motorized models feature a double shaft motor on one slide and a heavy-duty bearing assembly on the other slide. The manually operated versions have the bearing assembly on both slides.

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Positioning Stage

LinTech (Monrovia, CA) offers the 610 series totally enclosed positioning stage in stroke lengths from 6 to 60 inches (150 to 1520 mm). The screwdriven linear positioning systems use a low-friction, preloaded, recirculating linear ball bearing system that rides on precision ground linear rail guides. The linear rails are mounted to an extruded aluminum base, which provides support over the entire travel of the table’s carriage. The load is mounted to a machined aluminum carriage, which has threaded stainless steel inserts. There are 38 different acme and ball screw options.

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Piezo Drive

The Ensemble QDe™ desktop nanopositioning piezo drive from Aerotech (Pittsburgh, PA) was designed for seamless use with the Ensemble family of drives and controllers. The QDe connects to any Ensemble controller network, enabling coordinated motion between piezo stages and servo axes. The drive is suitable for single- or multi-axis applications such as point-to-point motion, linear and circular interpolation, multi-axis error correction, and autofocusing. High-speed interrupts and data logging capabilities provide a real-time link to external systems.

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Linear Stage

Bell-Everman (Goleta, CA) offers the SLS Light sealed linear stage that keeps contamination such as manufacturing debris, particulate, or liquid contaminants outside of the stage housing. The stage measures 80 x 120 mm, and has maximum dynamic payloads of 15 kg for the direct drive linear motor version and 30 kg for the ball screw version. Both sizes deliver a proprietary linear lip seal design that integrates with the stage’s anodized aluminum housing. The seal is made from a ruggedized polyurethane elastomer and resists chemicals, temperature extremes, and mechanical wear. The seal can be replaced without disassembling the stage or removing payload. Applications include any application where contaminants can threaten the smooth operation of a linear actuator including laser machining, welding, semiconductor, and machining.

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Position and Angle Measurement

The BML series from Balluff (Florence, KY) offers absolute position and angle measurement for installation or direct integration into drive and positioning systems. The magnetically encoded systems with Permagnet® nonius technology feature IP 67 housing for external installation. As an open kit for integration, they can be used in rotary applications as well. The formats, strokes, and end positions of axes can be adjusted automatically. The absolute encoder disk can be integrated into motors and actuators as an absolute feedback solution.

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Linear Guide System

PBC Linear (Roscoe, IL) released the Compact Series low-profile linear guide system for repeatable linear motion in tight spaces. The system features a 23-mm standard height, and can be configured to adapt to specific applications in automation, medical, dispensing robotics, and electronic board manufacturing. Options include Gliding Surface Technology bearings with a self-lubricating and maintenance-free liner, Profile Rail Technology for rigid performance, 6- and 10-mm-diameter lead screws in a variety of leads, Constant Force™ patented anti-backlash nut or standard fixed nut, and integrated NEMA 17 or 23 stepper motors, motor mount options, or manual hand knob.

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Linear Encoder

MICRONOR (Newbury Park, CA) introduced the MR303 linear position sensor system for OEM motion control applications. With 100-μm resolution and 50-μm accuracy, the encoder is suitable for medical, MRI, robotic, and industrial applications where position and speed must be precisely monitored, and electromagnetic immunity and invisibility is required. The sensor works in conjunction with the MR302-2 OEM controller that enables the sensor to integrate with conventional PLC controllers and servo drives.

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Rotary Encoders

POSITAL (Hamilton, NJ) released programmable incremental rotary encoders, en - ab l ing performance characteristics such as resolution (number of pulses per turn) and incremental pulse direction (A before B or B before A) to be modified by changing firmware parameters. The characteristics of the output driver can similarly be set to either Push-Pull (HTL) or RS422 (TTL). The encoders are based on magnetic measurement technology, and are compact and resistant to shock and vibration loadings. Resolution can be set in the range of 1 to 16,384 pulses per turn. They are available with high-performance seals for use in extreme environmental conditions.

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PWM Servo Drives

ACS Motion Control (Bloomington, MN) offers the NPMPM Series of dualaxis EtherCAT NanoPWM™ pulse width modulation servo drives. When utilized with the optional 10-MHz laser encoder interface and ServoBoost™ control algorithm, positioning systems can achieve speeds above 2 m/s, sub-nanometer jitter values, nanometer velocity tracking errors, and low settling time with minimal sensitivity to disturbances and load changes. Features include two drives per unit, voltage and current range of 12 VDC – 100 VDC and up to 13.3A / 40A (cont./peak), digital I/O, two Position Event Generators and 2 general-purpose outputs, analog I/O inputs of 4- and 12-bit resolution ±10V, and outputs of 4- and 16-bit resolution ±10V.

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