Motion Control

Frequency Inverters

NORD Gear Corp (Waunakee, WI) offers the NORDAC SK 500E and 520E AC vector frequency inverters. Both feature high torque, rapid response, and wide spread range for extended power outputs ranging from 0.25 kW to 7.5 kW. Available in sizes between 7.32 × 2.99 × 5.94" and 11.26 × 3.86 × 7.01", and features selectable modes for sensorless vector modes for closed-loop flux vector control, optional position control, and additional I/O. Other features include local operation through inverter controls, integrated dynamic braking chopper, automatic motor parameter identification, integrated Class A filter, side-by-side mounting, field bus compatibility, and high overload capability (150% – 60 sec., 200% – 5 sec.).

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Axial Piston Pump

Oilgear (Milwaukee, WI) introduced a contaminant-resistant PVWH open loop, axial piston pump. Ten sizes are available, and reach a pressure of 5,000 psi. With sleeve bearings that run on wet film and are pressure lubricated for stability, reliability, and repeatability, the unit is able to operate in special fluids. Features include: valve plate ported rear or top and bottom, SAE heavy duty shaft, high strength thru-shaft availability, up to 3,000 rpm, maximum pressure of 5,800 psi, and theoretical maximum displacements ranging from 0.66 in3/rev (10,8 ml/rev) to 7.94 in3/rev (130,2 ml/rev).

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Servo Amplifier

Copley Controls (Canton, MA) introduced the Model 800-1514 dual-axis servo amplifier for current (torque) control of brushless servomotors. The unit accepts encoder and Hall feedback data from a range of servo motor types. Drive torque is controlled by a ±10 V command from a motion controller or PLC, and uses CME 2 Windows software. The unit operates on a 20 V to 55 V isolated DC supply and delivers two independently controlled outputs (4 A peak, 3 A continuous), and communicates with the set-up computer via a RS232 link. Industry standard buffered encoder output, ±10 V torque command, and all control signals are optically isolated. The device provides 5 VDC output for encoder and Hall sensor operation, as well as dual-channel status indicators, protection circuits for voltage, load, temperature, and l2t current limiting. Dimensions are 6.58 × 3.9 × 1.17".

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Axis Motion Software

National Instruments (Austin, TX) released NI Motion Assistant 2.0 interactive software for prototyping single- and multi-axis motion control systems. Motion profiles from CAD and drafting programs can be imported using a DXF file format, and the software facilitates the implementation of profiles in NI CompactRIO programmable automation controllers or generation of code for PCI/PXI plug-in motion controllers. After saving a motion profile as a DXF file in a CAD or drafting program, the software can be used to import the profile and save motion-specific commands in an XML file format without writing additional code. Also featured is smart contouring and a graphical, point-and-click interface with 3D visualization capabilities for creating motion control applications using stepper, servo, and piezo actuators.

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DC Gear Motors

Nidec Copal USA Corp (Torrance, CA) offers the MG16 series of sub-miniature brush DC motors with high torque planetary boxes. The 8-model series is RoHS compliant and measures 16 mm. Available gear ratios include 60:1, 120:1, 240:1, and 500:1 with two excitation voltage levels of 6 VDC and 12 VDC. Performance ranges from 4.86 oz-in rated torque at 164 rpm and 22.6 oz-in starting torque for the 6-volt model with a 60:1 ratio, to 28 oz-in rated torque at 21 rpm and 146 oz-in started torque for the 12-volt model with a 500:1 ratio. Maximum gear motor weight for the 500:1 gear ratio is 1.24 oz. All models can operate from 0°C to 50°C ambient temperature range. Options include an encoder.

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Diaphragm Pumps

Thomas Products Div. (Sheboygan, WI) offers the Series 5002 miniature diaphragm liquid pumps, designed for all-liquid or mixed wet/dry pumping applications. Model 5002F pumps are single-head and measure 1.99 × 1.18 × 3.19". Model 5002FZ pumps are 1.99 × 1.18 × 4.88" and have twin heads. Both are oil-less. Standard materials include thermoplastic housings with ethylene propylene diene monomer diaphragms. Optional housing and diaphragm materials are available for use with aggressive media. Open flow is rated at 400 ml/min for single-head, and 850 ml/min for twin-head. Maximum pressure is rated at 40 m H2O, and maximum dry suction is 6 m H2O. Both 12 VDC and 24 VDC versions are available, with electromechanical compatibility protection included.

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Motor Driver

Allegro MicroSystems (Worcester, MA) has introduced the A3901 dual H-bridge low-voltage motor driver. Capable of operating one stepper motor or two DC motors, the unit is designed for portable applications with a power-off current of 50 nA and an operating voltage range of 2.5 V to 5.5 V. MOSFET output stages reduce voltage drop and power dissipation of the outputs. Internal circuit protection includes thermal shut down and hysteresis, transient-suppression diodes, and crossover current protection. The device is supplied in a lead-free, ten-lead MLP power package (3 × 3 × 0.75 mm) with an exposed thermal pad. Both H-bridges can be paralleled for higher current operation.

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