Shhh! Get rid of cogging with dc motors

Pittman Series 9000 brush-commutated dc motors from Ametek Technical Products can deliver quiet and smooth operation for equipment used in data storage, medical/biotech, semiconductor processing, and automation applications. Their modular construction promotes customization to satisfy specific requirements.They have 2-pole stators and 7-slot skewed armatures to minimize magnetic cogging and enable smooth and quiet running performance. Commutators are diamond turned after armature assembly to ensure optimum concentricity and long brush life and windings are resin-impregnated for greater reliability in incremental motion applications.Other standard features include ceramic magnets, silicon steel laminations, copper graphite brushes, and heavy-gauge steel housing. Motors are available in six lengths (from 1.82-inches to 3.35-in.) and can achieve a maximum continuous torque rating of 6.9 oz-in at speeds up to 6,070 rpm, depending on model. Speed, voltage, current, and torque characteristics can be varied to meet application demands. Customization options include planetary or spur gearboxes, optical encoders, alternate brush materials, brakes, cables, connectors, modified shafts, and RFI suppression.— Edited by C.G. Masi , senior editor Control Engineering Machine Control eNewsletter Register here and scroll down to select your choice of eNewsletters free .

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