Method of optimizing armature balance through lamination orientation

Abstract

An electrical flux conducting rotor having an axis of rotation. The rotor is formed with a stack of sheet metal blanks laminated together with the blanks extending perpendicular to the axis of rotation. The blanks have similar outline shapes disposed in alignment in the stack. The outline shape of each blank has a symmetry such that any blank in the stack is capable of being stacked in outline alignment with any other blank when displaced in such stacked relation angularly about the axis of rotation of said rotor a plurality of equal angular divisions of 360.degree.. Each blank has a predetermined orientation based upon being similarly blanked from the same metal sheet. The blanks of the stack are arranged preferably in one group which contains four successive blank sections. Each blank section contains a number of blanks equal to the number of blanks in each blank section. The blanks of the outer two blank sections are displaced angularly 180.degree. respect to the predetermined orientation relative to the inner two blank sections so as to statically and dynamically balance the orientation of the blanks of the blank sections about the axis of rotation of the rotor. Preferably, an outer two blank section and an adjacent inner blank section are also inverted with respect to the predetermined orientation relative to the other two blank sections.