Two new models have joined the N-470 PiezoMike precision-screw-type actuator family. The motorized, vacuum-compatible versions provide 20-nm positional resolution and travel ranges between ¼ and 1 in. The actuators are now available for ambient applications and in high vacuum (10-6 Torr) and ultrahigh vacuum
(10-9 Torr) configurations.
The devices replace manual micrometer screws and are computer controlled to simplify the automated adjustment of optics, lasers, and micromechanical components. Both metric and English mounts are available for easy integration into conventional mirror mounts, optics holders, and positioning stages.
When at rest, the drive is self-locking, requires no electric power, and generates no heat. The actuator’s high holding force of >100 N (22 lb) and self-clamping design make it vibration-proof and shock resistant.
Physik Instrumente (PI), 16 Albert St., Auburn, MA 01501, (508) 832-3456, www.pi-usa.us
The PowerGate 66/IP66 NEMA-4 variable-frequency drive (VFD) is a custom-made NEMA-4 (water-resistant) enclosure for use in harsh environments.
The stand-alone drive is for applications requiring precise motor-speed control, control of pumps and fans in HVAC and water-handling applications, and applications where the drive is exposed to water and dust.
Advantages include a unique keypad and display. The display information is in words, rather than number-based codes, and the keypad has 10 buttons laid out like a pocket calculator.
Additional benefits include compatibility with any of the company’s standard Electric E700 option cards and connectivity to Ethernet and factory-communications networks.
Mitsubishi Electric Automation Inc., 500 Corporate Woods Pkwy., Vernon Hills, IL 60061, (847) 478-2100, http://us.mitsubishielectric.com/fa/en
The FRB Series are vane-style rotary actuators that offer actuator rotation in tight spaces. The ultracompact, Pancake design comes in 10, 15, 20, and 30-mm versions. Standard rotation angles are 90°, 180°, and 270°. Stainless-steel shafting is a standard on the Series.
A unique sensor-mounting design allows adjustment through the entire range of travel. A comprehensive offering of position sensing includes round profile sensors with surge suppression, polarity protection, and LED indication.
Direct body mounting is standard with an optional flange mount available. The six-hole flange-mounting pattern allows mounting at 60° intervals.
Fabco-Air Inc., 3716 NE 49th Ave., Gainesville, FL 32609, (352) 373-3578, www.fabco-air.com
The ACOPOS line of servodrives now features repetitive control, which improves the accuracy of production processes with stationary disturbances by using predictive following-error compensation.
When using position-controlled drives with constant speed, mechanical conditions can cause stationary disturbing torque fluctuations, resulting in following error localized to a certain area. The drive controller configuration can be optimized to minimize these lag errors but will not be able to completely prevent the disturbance.
Embedded in the standard speed control loop, repetitive control adjusts the drive’s torque setpoint in a way that drastically reduces the periodic portions in the speed or following error. The algorithm undergoes a constant learning process so that changes to the load profile have no effect on the drive due to predictive compensation for disturbances.
B&R Industrial Automation Corp., 1250 Northmeadow Pkwy., S-100, Roswell, GA 30076, (770) 772-0400, www.br-automation.com
The XCTRL controller and X2DRV driver are specifically designed for the requirements of tension control with dancer arm or load cells for tension brakes.
Features of the controller include two sensor inputs that support dancer arm or load cells sensors; two channels selectable outputs 0 to 10 V or 4 to 20 mA; two PID controllers with linear or automatic inertia compensation; easy splicing setup; USB connection; and I/O remote control.
The driver’s advanced control technology provides accurate control of all electromagnetic brakes. Features include two channels, 24 Vdc, 4 A with antiresidual control; voltage or current controlled; two inputs control — 0 to 10 V or 4 to 20 mA; two integrated open-loop controls; and two auxiliary diameter compensation inputs (0 to 10 V or 4 to 20 mA) for automatic roll-diameter compensation.
Warner Electric, 31 Industrial Park Rd., New Hartford, CT 06057, (800) 800-6445, www.warnerelectric.com
Uhing Model RG linear-drive assemblies offer an option for fine adjustment of travel distance. More precise location of the drive unit’s reversal points enhances process accuracy and integrity. On standard units, end stops determining stroke length are on hex rods held in place with setscrews. Users loosen the screws to slide the stops to set the travel distance, then retighten the setscrew. With the fine-adjustment option, the end stops are positioned on threaded rods that extend through the pillow block end supports and a control knob is mounted on the end of each rod. The control knobs rotate the threaded rods, causing the end stops to move in very fine increments. This permits accurate location of the reversal points for a higher degree of precision.
An added benefit of this option is that operators may adjust travel distance while the drive is running, without placing hands near moving parts and risking injury. The control knobs are positioned on the end of the threaded rods opposite the drive end of the assembly, assuring clearance for connecting the shaft to the drive motor.
Seventeen sizes are available with axial thrust from 7 to 800 lb.
Amacoil Inc., 2100 Bridgewater Rd., Aston, PA 19014, (610) 485-8300, www.amacoil.com
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