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Frost is on the pumpkin as we start this edition of Motors Monthly. Let's see what's developed within the last month.
The National Electrical Manufacturers Association (NEMA) standard for motors and generators received approval from the American National Standards Institute (ANSI) as ANSI MG 1-2009 (R2010) Motors and Generators. The standard conveys information about performance, safety, test, construction and manufacture of ac and dc motors and generators. It also helps users in the proper selection and application of motors and generators.
Word's come in that a Tufts University research team has built the world's smallest motor. THe motor measures only one molecule wide or about 1-nm across! The researchers used a low-temperature scanning tunneling microscope to both power and view the operation of this nanomotor. The fact this motor runs on electricity rather than chemicals or light sets it apart from other nanomotors. Currently the applications for this tiny motor is limited, but possible uses could include propelling liquids along tiny sample pipes where friction with the wall prevents the fluid from moving.
What's in this issue —
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From a manufacturer’s perspective, custom leadscrews are those built to customer specifications rather than those of the manufacturer. A true custom supplier challenges engineering customers to answer “What if …” questions to define exactly what they want.
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The low-profile (0.867-in.-tall) M16 and M16/12 Twintus connectors from Sealcon LLC, Centennial, Colo., meet IP67 requirements for ac and dc motors, and when retrofitted with an M23 footprint, can handle M22 applications as well.
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When postal regulation changes mandated the placement of a third piece of tape on mass mailings, a manufacturer of paper-handling equipment had to economically meet the new requirements quickly. A switch from stepper motors to servodrives did the trick.
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When the topic of energy efficiency comes up, energy-efficient machine tools don't typically spring to mind. Yet machine tools contain motors and auxiliary components whose energy consumption varies widely during machining operations. Several means can be employed to reduce the amount of energy these machines consume.
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Roger Hess from Maxon Motor looks at the needs of high-speed electric motors that replace pneumatic systems in many medical and surgical areas. 4:15
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Cast-iron three-phase premium efficiency motors are available in horsepower ranges from 1 to 200 hp, with speeds of 1,200, 1,800, and 3,600 rpm. The motors are electrically reversible.
AutomationDirect
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A newly designed 70-W flat brushless dc motor delivers 130-nMn maximum continuous torque at 85% efficiency. The 45-mm-diameter motor is available with Hall sensors; comes in four windings — 24, 30, 36, and 48 V; and can be combined with more than 54 different planetary and spur gearheads.
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The XP100 explosionproof motor are UL and CSA listed for gas and dust ignitionproof environments, and are suitable for Division 1, Class I, Groups C & D, Class II, Groups F & G, hazardous-area classifications.
Siemens Industry Inc.
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