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VOLUME -26 NUMBER 7
Publication Date: 07/1/2011
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Special Features: SMT and Production
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July 2011 Issue
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Pittman: Brush-Commutated DC Servo Motors
Brush-commutated DC servo motor.
Kent, OH — Pittman
8540 Series brush-commutated DC motors compare favorably with similarly sized conventional counterparts; they provide improved power density from bonded neodymium magnets and offer higher-performance power solutions in a compact and lightweight design. Typical applications for this family of motors range from data storage and medical equipment to semiconductor processing and automation machinery.
The motors are available in three lengths (2.114, 2.585, and 3.057-in. (53.7, 65.7, 77.6mm) weighing from 4.66 to 7.55 oz. (132 o 214 gm) Depending on model, they can achieve continuous torque from 2.5 to 8.3 oz-in. (180 to 597 gm-cm.) without heat-sinking. Speed, voltage, current, and torque characteristics can be varied and a selection of standard windings enables optimized performance tailored to particular application needs.
The brush system for the 8540 Series motors reportedly delivers reliable and consistent performance over a longer life due to robust brass brush tracks that keep brushes aligned, constant-force springs that provide optimum brush pressure, and larger brushes offered in a choice of materials (including standard graphite).
The motors are said to exhibit very low magnetic cogging (or reluctance torque), the result of an optimized magnetic flux profile that promotes smooth operation and precise positioning control in servo applications. The motors are equipped with pre-loaded ball bearings to accommodate high speeds, radial and axial shaft loads, and temperature extremes.
A newly developed bearing support system and related construction techniques yield inherently more balanced 7-slot armatures and help minimize vibration and audible noise.
Complementary products available include gearboxes, encoders, and brakes, and motors can be customized with various shaft
configurations, leadwire assemblies, and transmission components (gears, pulleys, or sprockets). All Pittman 8540 Series motors incorporate an integral header allowing for use of a wider choice of lead connection configurations and easier installation.
Contact: Ametek Technical & Industrial Products, 627 Lake Street, Kent, OH 44240
330-673-3452 fax: 330-677-3306 Web:
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