| 摘要 |
A method of fabricating a limited-rotation motor that is characterized by axial stability of a rotor that includes a permanent-magnet armature and further characterized by a relatively small inherent axial force on the rotor. The rotor is supported by a pair of ball-bearing units and axial stability is provided by preloading the bearing unit at the end of the rotor with a relatively stiff spring and preloading the bearing at the second end with a relatively weak spring, whereby thermal expansion and contraction of the rotor are accommodated almost entirely by a movement of the second end of the rotor.A low axial force on the rotor is obtained by forming the armature with a split mold so that uniform compression is extended along the entire armature, resulting in relatively uniform magnetic properties, and by positioning the corresponding stator elements symmetrically relative to the magnetic center of the armature.
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