Andover, Hants, U.K. —Unimotor line of brushless ac servo motors consists of three-phase, six- or eight-pole, permanently excited synchronous motors exhibiting a sinusoidal back-EMF characteristic. They've been designed to provide high torque with either low- or high-rotor inertia and minimal cogging torque.
New Ulm, Minn.—MaxPlus 12-in. brushless servo motor delivers up to 90 hp or up to 300 lb-ft of continuous torque for high-production, high-torque applications. It is intended for very large machinery applications where the size and weight of conventional motors have made automation prohibitive.
With increases in most major market and industry groups, U.S. industrial production grew 0.5% in December, according to the Federal Reserve Board's recent "Industrial Production and Capacity Utilization" report. However, the report added that the overall gain was held back by a 2.
While investors and economists were shaken by last October's market plunge and bounceback, and by Asia's ongoing economic struggles, U.S. Commerce Department data show that new orders for the aggregated "Measuring and Controlling Instruments" (SIC 382) group grew consistently stronger last year following a weak late 1996 and early 1997.
To develop standard device profiles for semiconductor tool applications, the LonMark Interoperability Association recently created its new semiconductor task group. The group includes semiconductor tool and device manufacturers from the U.S., Europe, and Japan, including Lam Research, Edwards High Vacuum, Hermos Informatik, Kokusai Electric, Ebara, and Nippon Mot...
Lansdale, Pa.— Polymaster ET is a mixing and diluting system that can handle high molecular weight liquid polymers and retention aids and produce dilute solution at rates of up to 50 gpm. Polymaster is used extensively in paper making and water and wastewater treatment. Its patented Gatlin distribution head is a motor-driven mechanism that hydraulically segments the polymer into ultrathi...
The southern tip of California's Marin county is separated from the city of San Francisco by the most famous mile-long strip of steel and concrete in the world. Yet, within a 10-minute walk of the Golden Gate's Marin terminus begins a county-wide network of California Wildlife Service signs warning against mountain lion attacks.
Hauppauge, N.Y.—Escap P850 high accuracy microstepper incorporates the company's patented disc magnet design, providing repeatable resolution for 100,000 steps per rev with inertial loads. Absolute accuracy is within 3 arc-minutes of true position. Holding torque is 100 oz in with 4.6 A and a 100 W rating.
With electric motors driving the majority of today’s manufacturing processes, proper motor protection is critical. Not surprisingly, a significant amount of effort and resources have recently been invested in motor protection technology, resulting in cost-effective solutions to many of today’s common motor problems. Motors fail for a number of reasons–moisture and contamination, short circuits, mechanical problems and old age–but the primary reason is excessive heat, caused by excess current (greater than normal motor full load current), high ambient temperatures, and poor ventilation of the motor. The diagram shows the reduced life of a motor at various levels of overheating.
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