Maxon's electronically commutated (EC series), brushless pancake motors use ball bearings and have no mechanical brushes to wear out. The design reportedly offers long motor life, good heat dissipation, and high-overload capability be-
cause the coils are outside the rotor. Weighing 88g (3.1 oz), the motor's diameter is 43 mm (1.69 inches) while the length of the motor body (excluding shaft) is 16.3 mm (0.64 inches). Continuous output power is 12W, while maximum speed is 10,000 rpm. Ambient temperature range is -40 to 85C (-40 to 185F). Using electronic commutation minimizes electrical noise.
Maxon Precision Motors, 838 Mitten Rd., Burlingame, CA 94010; FAX (650) 697-2887; www.maxon.com.
The latest addition to the M-100 family of Rapidtrak actuators is this rodless, belt-driven unit. Actuator can handle a maximum saddle load of 900 lbs and maximum thrust load of 281 lbs at stroke lengths up to 22 ft. The rodless design permits low profile and reduced length. A double-ended drive shaft allows for various drive options. Targeted for applications requiring speeds up to 200 inches per second.
Warner Electric, Dana Corporation, 449 Gardner Street, South Beloit, IL 61080; FAX (815) 389-2582.
LO-COG®brush-commutated dc gearmotors use spur gearheads and can deliver up to 500 oz-inch of torque at the output shaft. Gearmotors are available in three frame sizes (Series GM8000, GM9000, and GM14000) with several length and performance options. Applications range from imaging and medical devices to mass storage and office automation equipment.
Pittman, 343 Godshall Drive, Harleysville, PA 19438; FAX (215) 256-1338; www. pittmannet.com.
Vacuum lines, wiring harnesses, concentric shafting, or cooling lines can run through the center of the Rotary Vector hollow shaft gear reducer (RV-C). Hole sizes range from 31 mm (1.2 inches) to 138 mm (5.4 inches). Built-in output bearing supports large thrust and overhung loads. RV-C is one of three heavy duty RV power transmission configurations manufactured by Teijin Seiki and supplied by Harmonic Drive Technologies. These precision drives offer high-ratio gear reduction in a compact design, and achieve high torsional rigidity and overload torque capacity at 500% rated torque. Total lost motion from all sources, including backlash, spring rate, and hysteresis, is limited to 1 arc-min.
Harmonic Drive Technologies, 247 Lynnfield St., Peabody, MA 01960-4905; FAX (978) 532-9406.; www.harmonic-drive.com.