US 4,738,020 A · Method for manufacture of laminated parts

Abstract

Elongated thin strip stock is blanked to form interlocking laminas for electric motor or generator rotors or stators at successive blanking stations. At a final assembly station the laminas are stacked and pressed into interlocking relationship. In response to an operator input a predetermined number of reversals, or half turns about the stack axis of the previously stacked lamina are provided in order to compensate for nonuniform strip thickness to obtain a rotor or stator of substantially uniform height. Alternatively the thickness of the strip stock is gauged at transversely spaced points on the strip to determine cross feed thickness variation in the strip whereupon the stacked laminas are automatically provided with a number of reversals about the stack axis in response to a thickness differential that would result in a parallelism error in the stack that exceeds a predetermined amount. Rotor conductor slots are formed in the stacked laminas and are skewed to the stack axis by providing arcuate indexing of each lamina relative to the next preceding lamina in the stack by an arcuate increment that is automatically determined in response to operator entered inputs relative to the stack height, the skew angle, nominal lamina thickness and skew direction.

Claims9

Dependent claims

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.

2 more elements

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.

3 more elements

Dependencies are inferred from the claim text.

Method for manufacture of laminated parts

Life of this patent

Method for manufacture of laminated parts

Life of this patent

Abstract

Claims9