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Brush DC Motors for Quiet Operation
April 2008
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Designed to deliver quiet and smooth operation, Pitt-man Series 9000 brush-commutated dc motors are suited for equipment used in data storage, medical and biotech, semiconductor processing, and automation applications. The motors, with two-pole stators, incorporate seven-slot skewed armatures to minimize magnetic cogging (or reluctance torque), thus enabling smooth and quiet running performance. Commutators are diamond turned after armature assembly to ensure optimum concentricity and long brush life. Windings are resin-impregnated for greater reliability in incremental-motion applications. Other standard features include ceramic magnets, silicon steel laminations, copper graphite brushes, and a heavy-gauge steel housing. The motors are available in six lengths (from 1.82 to 3.35 in.) and can achieve a maximum continuous torque rating of 6.9 oz-in. at speeds up to 6070 rpm, depending on model. Speed, voltage, current, and torque characteristics can be varied to meet application demands. Their modular construction promotes customization to satisfy specific requirements. Options include planetary or spur gearboxes, optical encoders, alternate brush materials, brakes, cables, connectors, modified shafts, and RFI suppression or special configurations.



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