Motion Control

Translation Stage

Physik Instrumente (PI) LP (Auburn, MA) introduced the P-652 piezoelectric linear-motor driven translation stage, measuring 9.0 × 6.5 × 2.4 mm. Consisting of four parts (ultrasonic piezoelectric resonator, two lateral sliders, and a spring doubling as the moving carriage), the device can replace classical drive elements in a micro-system. The stage offers a travel range of 3.2 mm and can move up to 80 mm/sec. The load to be moved is mounted directly on the carriage and moved by a force of up to 100 mN. The unit is backlash free (no lead screws), with power consumption in steady state conditions being zero. No external brake is needed to maintain stability. Other features are: 55 mA operating current, holding force of >0.2 N, and a resolution of better than 0.1 microns.

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Bi-Directional Motors

Oilgear Co. (Milwaukee, WI) introduced the MFW and MVW fixed and variable displacement bi-directional high-speed motors, offered in two frame sizes and four displacements. Features are: cylinder mounted in polymerous journal bearings for special fluids, a hard-on-hard rotating group for greater contaminate resistance, a sealed front shaft bearing, metered hydrodynamic or regenerative braking, maximum pressure of 4,500 psi, and maximum speed to 3,000 rpm.

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Mini Servo Actuator

Harmonic Drive (Peabody, MA) introduced the FHA Mini Actuator, a hollow shaft, brushless servo actuator. The unit is a combination brushless DC servomotor and an encoder, with a through-bore up to 14 mm in diameter. The flanged output is supported by a bearing structure allowing the load to be mounted to the actuator. The maximum torque is up to 250 in-lb, with an accuracy of 1.5 arc minutes. Three frame sizes are available, ranging from 50 – 74 mm square, and 48 – 66 mm in length.

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Digital Motion Controller

The EPOS P 24/5 from Maxon Precision Motors (Fall River, MA) is a programmable digital motion controller capable of position, velocity, and current mode. The unit’s supply voltage is 11 – 24 V DC; the controller is capable of 5 A maximum continuous current and 10 A peak current. The device, after initial programming, can operate standalone or to control other non-programmable EPOS units. Communication is by RS-232 or CANopen. Programming is done via the IEC 61131-3 standard with various editors (ST, IL, FBD, LD, and SFC) Maximum motor speed is 25,000 rpm for 2-pole motors; maximum encoder input frequency is 1 MHz. The unit features six digital inputs, four digital outputs, and two analog inputs. Dimensions are 105 × 83 × 24 mm.

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3-Phase Motor Control

TURCK (Minneapolis, MN) released the BL20 xStart motor starter modules that allow 3-phase motor control to be connected to the same rack as standard I/O. The units may be mounted next to other BL20 modules, allowing motors to be controlled via DeviceNet, Profibus-DP, or CANopen fieldbus protocols.

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Roller Bearings

AST Bearings (Montville, NJ) introduced the High Carbon Chromium Steel Tapered Roller Bearings line, comprised of the inner and outer rings, tapered rollers, and a cage (roller retainer). The rings and rollers carry the load; the cage spaces and retains the rollers on the inner ring. The product is stable under heavy loads, is resistant to harsh or contaminated environments, and designed for moderate speed applications. Metric and imperial sizes are available. Standard stock sizes are: ID 15 – 240 mm or 0.59 – 9.45" to OD 35 – 40 mm or 1.38 – 15.75". Customization is available.

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Magnetic Encoders

Baumer Electric (Southington, CT) released four magnetic encoders for harsh or contaminated environments. The devices come in diameters of 30 and 40 mm. The EcoMag 30 and EcoMag 40 are incremental encoders, offering resolution from 2 – 1,024 ppr. Their absolute counterparts, the MagRes 30 and MagRes 40, provide single-turn resolution up to 10 bits and SSI output. Maximum rotational speed for the sensors is 12,000 rpm. The 30 mm sensors have shaft diameters of 5 mm; the 40 mm hollow shaft sensor accepts shaft diameters of 12 mm. Both models are resistant to high shock and vibration.

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