... a 1 2- , 2 4-, or 36-VDC permanent-magnet motor. Thesemotors are capable of performing such tasks as positioningantenna reflectors, opening and closing security gates, handlingmaterials, and ... and raising and lowering scissors-type lift tables,machine hoods, and light-duty jib crane arms.Other linear actuators are designed for use in fixed locationswhere either 12 0- or 22 0-VAC line ... brush-type and brushless. The brush-type PM DC servomotorsinclude those with wound rotors and those with lighter weight,lower inertia cup- and disk coil-type armatures. Brushless servo-motors...