Stepper Motor Rotor with Internal Damper

摘要

A rotor for an electric motor with improved oscillation settling characteristics has a shaft rotatable about a longitudinal axis, a rotor section, disposed on the shaft for rotation together with the shaft, and, in certain arrangements, a permanent magnet disposed adjacent to the rotor section for rotation together with the shaft. The rotor section defines a recess around the shaft, extending from an end of the rotor section axially toward the opposite end of the rotor section, or the permanent magnet, if it is provided, and at least one mass is secured to the rotor section within the recess by a layer of deformable damping material, such as a dielectric gel. The rotor is particularly appropriate for use in a hybrid stepper motor, a variable reluctance motor, or a permanent magnet brushless motor, and a process of assembling the rotor is also referred to.