This ERN series of rotary encoders has been expanded for use with electrical drives. This addition is reportedly in response to the need of many electrical drives, which are still supplied by analog servo amplifiers and have no interpolation for encoder signals. Models ERN 1321 and 1326 have been added to the line of models 1381 and 1387. They are compatible with both asynchronous and synchronous drives. Both new types can be used in applications to 120C.
Heidenhain Corp.,333 E. State Pkwy., Schaumburg, IL 60173-5337; FAX (847) 490-3931; www.heidenhain.com.
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This company's SPACEA line of deep-groove and angular contact ball bearings is specifically designed to withstand the rigors of spaceflight. The bearings are made of martensite stainless steel and come with either a fluororesin or autensite stainless steel retainer. Designed to maintain lubricity in a vacuum environment and at extreme high and low temperatures, the bearings are lubricated with high-vacuum grease.
NSK Corp.,3861 Research Park Dr., Box 1507, Ann Arbor, MI 48106-1507; www.nsk-corp.com.
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Harmonic drive gear
Size 14 harmonic drive gear with a 30:1 gear ratio is reported to have the lowest gear ratio available for harmonic drive gearing. The compact gear component measures 50 mm in diameter and 29 mm in length. Capabilities include a maximum output speed of 460 rpm, rated torque of 35 inch-lbs, and repeated peak torque of 80 inch-lbs. These gears deliver 2 arc-min positional accuracy and smooth motion. Reportedly, with this low ratio, harmonic drive gearing may now be used in applications where planetary gears might have been used previously, resulting in a reduction in package size while increasing positional accuracy.
HD Systems Inc.,89 Cabot Ct., Hauppauge, NY 11788; FAX (516) 231-6803; www.hdsystemsinc.com.
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GGSX Series 40 gas springs have a longer service life than larger springs due to improved multilobe seals, according to the company. The springs are available with pressures from 15 to 100 pounds in five-pound increments. All of them share 0.59 inch diameter tubes and 0.24-inch diameter rods, which enables installation in tight spaces.
H. A. Guden Co.,99 Raynor Ave., Ronkonkoma, NY 11779-6634; FAX (516) 737-2933; www.guden.com.
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Designed to provide long-term trouble-free performance, this line of precision planetary gear reducers draws upon the company's Zenithdivision. Two classes of gearheads are offered: the Precision, for applications requiring exacting precision; and the Utility, for price sensitive opportunities. A full product mix of frame sixes and reduction ratios are currently available.
Parker Hannifin,8940 Tyler Blvd., Mentor, OH 44060-2186; FAX (800) 892-1008; www.parker.com.
For Information, circle 626
Brushless dc motor
The PLATINUM(R)XT Series three-phase brushless dc servomotor uses a slotless armature technology, reportedly resulting in zero cogging. It is available in three frame sizes, 9, 12, and 16 cm. Continuous output torque range in from 0.6 to 2.7 N-m (85 to 390 oz-inch). The motor operates up to speeds of 6,000 rpm. Typical applications are semiconductor wafer handling, inspection, and medical apparatus. Motor options include resolver or encoder feedback and IP-65 sealing.
Kollmorgen Motion Technologies,201 Rock Rd., Radford, VA 24141; FAX 540-731-0847; www.kollmorgen.com.
For Information, circle 627
Model LA 15-16-020A is a two-wire non-commutated direct drive linear voice coil servo actuator featuring cog-free, hysteresis free motion with high acceleration capability. The 1.5 x 1.56 inch device has a 0.4 inch stroke. It is rated at 2.6 lbs force continuous and 7.6 lbs for 10 seconds. Model LA 15-16-024A is a 0.25 inch stroke linear voice coil actuator rated at 5.5 lbs continuous and 20 lbs for 10 seconds. The two wire non-commutated actuator measures 1.5 x 1.56 inches and is hysteresis free, cog-free, and has a simple linear control characteristic.
BEI Kimco Magnetics,804-A Rancheros Dr., San Marcos, CA 92069; FAX (760) 744-8815; www.beikimco.com.
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Digital motion controller
Designed for use with Series 90-30 PLCs, the DSM314 digital motion controller controls up to four analog servos, or two digital servos plus one analog servo. It offers single point programming, high-speed Local Logic support, and strobe position capture for accurate control in high speed processes. With the support of VersaPro 1.1 programming software and CPU Release 10.0, the DSM314 reportedly allows single point programming by storing all motion programs in the CPU.
GE Fanuc Automation,Box 229, Whitehall, PA 18052; FAX (610) 437-5212; www.gefanuc.com.
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The NDN family of high precision, stain-less steel positioning tables feature precision-machined construction, corrosion resistant materials, and incorporate design elements that ensure economical long-term operation in high-speed applications. The NDN tables consist of only four components, the stainless steel lower base, upper saddle, a brass ball cage, and stainless steel rolling elements, which are matched to 1 micron.
Schneeberger,11 DeAngelo Dr., Bedford, MA 01730; FAX 781-275-4749; www.schneeberger.com.
For Information, circle 630
The EC series of brushless motors are electronically commutated, which the company says gives them extremely long motor life. Hall effect sensors are built in to provide feedback to the control electronics, and the coils are placed outside the rotor to dissipate heat and increase load capability. The motors utilize high-energy neodymium magnets, and are available in both Y and delta configurations.
Maxon Precision Motors,838 Mitten Rd., Burlingame, CA 94010; FAX (650) 697-2887; www.mpm.maxonmotor.com.
For Information, circle 642
This company's line of machined springs is made from high strength magnetic and non-magnetic steels, aluminum, Delrin, and titanium. A curved beam helix provides precise deflection rates for compression, extension, torsion, lateral bending, and lateral translation. Applications include satellite instruments, medical equipment, and scientific apparatus to conveyors and oil field equipment.
Helical Products; FAX (805) 928-2369; www.heli-cal.com.
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Linear motor positioning
This multi-axis linear motor positioning system is designed for smooth, low friction, linear motion. The company's system reportedly eliminates bearing jitter, providing maximum velocities up to 3M/sec and accelerations up to 6G. Recommended for setup and scan PC board inspection, they are available for ironless and iron core motors and in single or multi-axis configurations, offering designers total system flexibility.
Bayside Motion Group,27 Seaview Blvd., Port Washington, NY 11050; FAX (516) 484-5496; www.baysidemotion.com.
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When production is interrupted because a key servomotor fails, this company says time and money can be saved with repair. They fix ac and dc servomotors to original performance specifications, reportedly faster than it would take to have a new one shipped from the original manufacturer, and at cost savings. After the repair is completed, motors are tested on a servo drive to assure rated performance. The process includes the motor and all integral components, such as encoder, breaks, Halls, and tachometer.
Servo Repair International,1641 Butler Plank Rd., Glenshaw, PA 15116; FAX (412) 492-8126; www.servorep.com.
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Two actuators are now available: LA15-16-020A is a two-wire, non-commutated direct drive linear voice coil servo actuator with cog- and hysteresis-free motion and high acceleration. LA15-16-024A model is a 0.25 inch stroke linear voice coil actuator rated at 5.5-lb force continuous.
BEI Kimco Magnetics,804-A Rancheros Dr., San Marcos, CA 92069; FAX (760) 744-0425; www.beikimco.com.
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The Series 3564 BC integrated brushless motor incorporates an amplifier and motion control module into one package. The company reports that precision machining and molding, proven technology, and single chip microcomputers all result in a product that they say has the smallest footprint in the industry. The Series 3564 BC is available in 33 gearhead ratios and output torques of up to 15Nm.
Micro Mo Electronics,14881 Evergreen Ave., Clearwater, FL 33762-3008; FAX (727) 573-5918; www.micromo.com.
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Closed loop positioning control
Microprocessor technology reportedly gives 100 millisecond indexing capability, cycle rates to 600 plus or minus cpm, and torque up to 88,000 inch-lbs for high productivity and precision indexing operations. The control can be programmed for up to eight different index set points. Closed loop error compensation is reported to approach servodrive accuracy of plus or minus 1 count per index. Available in door or panel mount, the microprocessor based control has menu and touch pad inputs and 16 character, 2-line output display.
Force Control Industries,Box 18366, Fairfield, OH 45018; FAX (513) 868-2105; www.forcecontrol.com.
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The 22BC model 22-mm brushless motor has repositioned bearings and improved rotor balance to reduce noise and wear. Motor is available in 50W(long) and 15W (short) versions, and can be used in pressure valve and actuators in cabin pressure and air circulation systems.
API Motion,45 Hazelwood Dr., Amherst, NY 14228; FAX (716) 691-9181; www.apimotion.com.
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Servoamplifier uses all digital techniques for designing and implementing precise servomotor controlled actions. Users program all motor drive actions using this PC and Windows based software. Motor's electrical and mechanical characteristics can be matched to the amplifier by entering numerical values into the software program.
Copley Controls,410 University Ave., Westwood, MA 02090; FAX (781) 329-4055; www.copleycontrols.com.
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Planetary gearhead obtains a backlash of 3 arc minutes (0.05 DEG) or less. Combining servo and stepper motor technology, a built-in feedback device is used to monitor the motor shaft for detection and correction for loss of synchronization. Runs open loop under normal conditions and runs in closed loop when a position deviation of 1.8 degrees or greater is seen.
Oriental Motor Corp.,2570 West 237 th St., Suite 102, Torrance, CA 90505; FAX (310) 325-4146; www.orientalmotor.com.
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Features include 12-bit vertical resolution from one normal and one complimentary output. Capable of generating an arbitrary waveform from 60 MS/s to 1.0 GS/s. Integrated clock synthesizer drives AWG with 1 Hz resolution. Digital outputs include eight TTL marker outputs and a dual complimentary optional PECL buffered clock output.
Chase Scientific Co.,7960-B Soquel Drive, Suite 191, Aptos, CA 95003; FAX (831) 479-8572; www.chase2000.com.
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Inverter drive motor
Paint Free Inverter Drive Motor is made for applications exposed to high pressure washdowns. The motor is available with 0.5 through 10 hp in non-painted TEFC and TENV enclosures for NEMA frames 56C through 215TC. The unit is designed for use with variable frequency drive in applications requiring full torque at low or zero speeds and exposed to frequent cleaning with caustic solutions. Sealed ball bearings with moisture resistant grease and a stainless steel motor frame are standard.
Baldor Motors and Drives,5711 R.S. Boreham Jr. St., Fort Smith, AR 72908; www.baldor.com.
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Self-aligning spherical bearing for use in linear motion and full rotation applications. The Duralonbearings are manufactured with a woven Teflonfabric liner backed by a casing of filament wound fiberglass and epoxy resin. The outer race is made of 17-4PH stainless steel. The bearings are reportedly capable of handling dynamic loads up to 30,000 psi in pivoting and temperatures of -65F to +325F. Additionally, a low coefficient of friction avoids slipstick problems at high loads.
Rexnord Corp.,2324 Curtiss Street, Downers Grove, IL 60515; www.rexnord.com.
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