Motion Control

Brushless Motor Drive

Intelligent Motion Systems (IMS, Marlborough, CT) released the MDrivePlus motion control system for brushless motor applications. The unit features 20 microstep resolutions to 51,200 (full step, degrees, metric, and arc minutes), a motion control system-on-a-chip, electronic gearing, 6,385 bytes of program storage, and analog input to 10 VDC. Drive voltage ranges include +12 to +75 VDC and 120 and 240 VAC. The housing is chemical resistant and the unit has a cast aluminum heat sink. Outputs are configured for sourcing or sinking, and the unit features an auxiliary logic power input.

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Motor Drive Module

International Rectifier (El Segundo, CA) released the IRMCT3UF1 fully integrated high-reliability hybrid motor control modules enabling digital, sensor-free vector control of permanent magnet motors. The module combines digital control, analog interface, and power stage. Speed and torque control are provided with commutation or position sensors. Sinusoidal current control enables current startup sequencing and low loss space vector pulse-width modulation. EMI is suppressed. The unit’s algorithm accommodates motor parameter variation for compatibility with brushless DC and permanent magnet AC motors.

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Hub-Fastening Gears

Sterling Instrument (New Hyde Park, NY) released the “S1268Z-...M” series of 84 combination aluminum-acetal gears. Coming in metric and imperial sizes, the gears are 20° pressure angled, AGMA Q10 and ISO Class 7. Sizes range from 21 – 210 teeth with outer diameters ranging from 0.958 – 4.083". The gears are designed to mate with hubs accepting shaft sizes from 0.0900 – 0.2498" in diameter, and come in 24, 32, 64, and 72 diametral pitches with a face width of 1/8". Other features include noise reduction, a small gear hub envelope, and Fairloc® integral hub fastening system technology.

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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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