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Servo Drives

Parker Hannifin’s Electromechanical Automation Div. (Rohnert Park, CA) offers high-power Compax3 all-digital servo drives, available with current output to 10A and 15A RMS. The drives feature auto-tuning, internal function generator on all units, and support for Stegmann single- and multi-turn absolute encoders. All Compax3 drives ship with the Compax3 ServoManager software package for commissioning the drive. The ServoManager program provides diagnostic screens, graphical tuning utilities, an OS download tool, HTML Help tools, an S-curve acceleration calculator, and a motor configuration wizard to be used with non-Parker motors.

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Servo Controller/Driver

QuickSilver Controls (San Dimas, CA) has added multi-thread capability to its SilverDust servo controllers/drivers for NEMA 17 and 23 frame motors. Users can execute two programs simultaneously in the same controller for motion applications where the servo controller is used as the main logic controller. One thread can be used to execute motion-oriented programs, while the other is dedicated to I/O processing. Either thread can change position or velocity by modifying the respective registers. With both program threads running, execute time is 240 microseconds. The 8-kHz servo loop, 1-MB CANopen, and 230-KB serial channels execute as normal.

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CAN Card

The Model CAN-PCI-02 Control Area Network (CAN) card from Copley Controls Corp. (Canton, MA) provides an interface between the company’s distributed motion control software and its CANopen servo and stepper drives. It facilitates plug-and-play CANopen operation and is PCI compliant. Compatible with 3.3V and 5VDC environments, the card’s onboard microcontroller offloads processing tasks from the host computer. The card employs high-speed ISO 11898 driver circuits for CAN bus bit rates to 1 Mbit/sec, and provides dual isolated channels and PCI 32-bit interface. The card’s two independent CAN ports are isolated for noise immunity.

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Linear Bushing

THK America (Schaumburg, IL) has introduced a self-adjusting power linear bushing with cages engineered of resin that continually lubricates the rolling elements. The bushing also features a hardened steel ball plate with a ground groove that is slightly larger than the ball, which results in increased contact area between the ball and the ball plate. The ball retainer and outer sleeve are made of a lightweight, low-friction, wear-resistant synthetic polymer, allowing for quiet operation. The convex shape of the ball plate provides a pivot point at the center, which permits self-adjustment up to 0.5°.

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Piston Pumps

The Series 2665/2685 WOB-L piston pumps by Thomas Products Div. (Sheboygan, WI) incorporates epoxy-coated head and valve plates for exterior corrosion protection, aluminum construction, and a Teflon piston seal that remains flexible even in cold. The pumps are intended for use where fan guards are not required; Series 2685 pumps include a stainless steel fan guard. Oil-less, non-lube pistons and cylinders prevent airflow contamination, while twin fans provide cooling of the motor and cylinder. All series 2265/2685 pumps provide up to 100 psi of pressure, and a pressure relief valve is also included. Thermally protected AC motors are of ultra-reliable permanent split capacitor design. Maximum flow for pumps equipped with 115 VAC 60 Hz single phase motors is rated at 3.68 CFM; maximum flow for pumps equipped with 220-240 VAC 50 Hz single phase motors is 3.23 CFM.

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Brushless Servomotors

PennEngineering® Motion Technologies (Harleysville, PA) offers the MAE® Series BM brushless servo motors that can be equipped with Hall effect sensors and encoders. The motors feature copper integrated in the stator’s winding. They are available in nine models incorporating four- or eight-pole stators. A rotor structure allows maximum magnetic flux. Motor lengths range from 55 mm to 274.5 mm, and external diameters range from 5.1 cm to 10 cm. Rated torque up to 6 Nm and peak torque up to 18 Nm can be reached, depending on the model. The servomotors can be mounted with flanges.

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Conveyor System

The Quickdraw® conveyor system from MagStar Technologies (Hopkins, MN) is designed for lab and cleanroom environments. It stands 2-7/8" and is only 1-1/2" wider than the transport tray. It uses sealed ball bearings rather than belts. The unit allows for variable speed, bi-directional transport, changeable layouts, and precision stopping for tight-tolerance processing. Integrated sensors provide users with conveyor control within specific conveyor zones. The control system is self-contained with plug-and-go operation so no PLC is needed for setup or operation. Sensor, logic, and motor controls are built into the rail for easy access.

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