Method for manufacture of laminated parts

Claim 1

A method of manufacturing laminated parts wherein the laminas of the parts are blanked from lamina areas on sheet stock and then stacked to form the part, the laminas having opposite planar surfaces, comprising: a first step of measuring the thickness of first and second spaced points on lamina stock for obtaining first and second thicknesses, respectively, of a lamina; a second step of comparing said first and second thicknesses and determining a thickness variation therebetween; a third step of stacking the laminas; a fourth step of where 112 selecting relative rotations between the lamina stack and a lamina to be stacked about a lamina axis perpendicular to the lamina planar surfaces according to said thickness variation to provide a lamina stack having a desired parallelism; a fifth step of providing said relative rotation of a selected lamina in said fourth step prior to stacking of said selected lamina to thereby compensate for lamina thickness variations.

Claim 2

A method of manufacturing laminated parts wherein the laminas of the parts are blanked from lamina areas on sheet stock and then stacked to form the part, the laminas having opposite planar surfaces, comprising: a first step of measuring the thickness of first and second spaced points on lamina stock for obtaining first and second thicknesses, respectively, of a lamina; a second step of comparing said first and second thicknesses and determining a thickness variation therebetween; a third step of stacking the laminas; a fourth step of where 112 selecting relative rotations between the lamina stack and a lamina to be stacked about a lamina axis perpendicular to the lamina planar surfaces according to said thickness variation to provide a lamina stack having a desired parallelism; a fifth step of providing said relative rotation of a selected lamina in said fourth step prior to stacking of said selected lamina to thereby compensate for lamina thickness variations.

Claim 7

A method of manufacturing laminated parts wherein the laminas of the parts are blanked from lamina areas on sheet stock and then stacked to form the part, the laminas having opposite planar surfaces, comprising: a first step of stacking the laminas; a second step of selecting relative rotations between the lamina stack and a lamina to be stacked about a lamina axis substantially perpendicular to said lamina planar sufaces to provide a lamina having a desired parallelism; said selecting being performed in the following manner; ______________________________________ CONDITION relative rotation ______________________________________ n < (N/2Q - 1/2) No (N/2Q - 1/2) < n < (N/2Q + 1/2) Yes (N/2Q + 1/2) < n < (1.5N/2Q - 1/2) No (1.5N/2Q - 1/2) < n < (1.5N/2Q + 1/2) Yes (1.5N/2Q + 1/2) < n < (2.5N/2Q - 1/2) No (2.5N/2Q - 1/2) < n < (2.5N/2Q + 1/2) Yes (2.5N/2Q + 1/2) < n < (3.5N/2Q - 1/2) No (3.5N/2Q - 1/2) < n < (3.5N/2Q + 1/2) Yes (3.5N/2Q + 1/2) < n < (4.5N/2Q - 1/2) No (4.5N/2Q - 1/2) < n < (4.5N/2Q + 1/2) Yes (4.5N/2Q + 1/2) < n No ______________________________________ Where: N=nominal total number of laminas in a stack; Q=number of predetermined stack relative rotations; n=the particular lamina number in a stack where n=1 for the first lamina and n=N for the last lamina; a third step of providing said relative rotatio for a selected lamina prior to stacking of said selected lamina to thereby compensate for lamina thickness variations.

Claim 8

A method of manufacturing laminated parts wherein the laminas of the parts are blanked from lamina areas on sheet stock and then stacked to form the part, the laminas having opposite planar surfaces, comprising: a first step of stacking the laminas; a second step of selecting relative rotations between the lamina stack and a lamina to be stacked about a lamina axis substantially perpendicular to said lamina planar sufaces to provide a lamina having a desired parallelism; said selecting being performed in the following manner; ______________________________________ CONDITION relative rotation ______________________________________ n < (N/2Q - 1/2) No (N/2Q - 1/2) < n < (N/2Q + 1/2) Yes (N/2Q + 1/2) < n < (1.5N/2Q - 1/2) No (1.5N/2Q - 1/2) < n < (1.5N/2Q + 1/2) Yes (1.5N/2Q + 1/2) < n < (2.5N/2Q - 1/2) No (2.5N/2Q - 1/2) < n < (2.5N/2Q + 1/2) Yes (2.5N/2Q + 1/2) < n < (3.5N/2Q - 1/2) No (3.5N/2Q - 1/2) < n < (3.5N/2Q + 1/2) Yes (3.5N/2Q + 1/2) < n < (4.5N/2Q - 1/2) No (4.5N/2Q - 1/2) < n < (4.5N/2Q + 1/2) Yes (4.5N/2Q + 1/2) < n No ______________________________________ Where: N=nominal total number of laminas in a stack; Q=number of predetermined stack relative rotations; n=the particular lamina number in a stack where n=1 for the first lamina and n=N for the last lamina; a third step of providing said relative rotatio for a selected lamina prior to stacking of said selected lamina to thereby compensate for lamina thickness variations.

Claim 9

A method of stamping electric motor stator or rotor laminas from sheet stock material, provided from a supply, to form a stack of laminas each having a planar surface comprising the steps of: a first step of guiding sheet stock material from the supply; a second step of stamping laminas in predetermined planar configurations each having an axis substantially perpendicular to the lamina plane and each having conductor slot openings arcuately spaced about said axis; a third step of coaxially stacking said laminas so that the lamina axes are coaxial to form a stack having a stack axis substantially coaxial with said lamina axes, said stack axis being substantially perpendicular to the plane of each of said laminas; a fourth step of providing incremental indexing of each of said laminas relative said stack rotationally about said stack axis a predetermined degree of rotational arc prior to stacking of said each lamina so that said openings form conductor slots having a slot axis skewed to said stack axis by a skew angle corresponding to said degree of rotational arc; a fifth step of adjustable presetting the degree of said rotational arc to automatically obtain a desired skew angle; a sixth step of utilizing the parameters of relative skew between said slot axes and said stack axis, stack height, and lamina thickness to determine said predetermined degree of rotational arc for automatically arcuately indexing each lamina to obtain said desired skew angle.

Claim 10

A method of stamping electric motor stator or rotor laminas from sheet stock material, provided from a supply, to form a stack of laminas each having a planar surface comprising the steps of: a first step of guiding sheet stock material from the supply; a second step of stamping laminas in predetermined planar configurations each having an axis substantially perpendicular to the lamina plane and each having conductor slot openings arcuately spaced about said axis; a third step of coaxially stacking said laminas so that the lamina axes are coaxial to form a stack having a stack axis substantially coaxial with said lamina axes, said stack axis being substantially perpendicular to the plane of each of said laminas; a fourth step of providing incremental indexing of each of said laminas relative said stack rotationally about said stack axis a predetermined degree of rotational arc prior to stacking of said each lamina so that said openings form conductor slots having a slot axis skewed to said stack axis by a skew angle corresponding to said degree of rotational arc; a fifth step of adjustable presetting the degree of said rotational arc to automatically obtain a desired skew angle; a sixth step of utilizing the parameters of relative skew between said slot axes and said stack axis, stack height, and lamina thickness to determine said predetermined degree of rotational arc for automatically arcuately indexing each lamina to obtain said desired skew angle.