Патент USA US3058049код для вставки
Oct. 9, 1962 w. A. RAY 3,058,039 LAMINATED MAGNETIC vSTRUCTURE, AND PROCESS FOR MAKING SAME Filed June 24. 1957 A .12 2e | 6 ' J2 2Z2; ' 2 “) L . é . J7 mun/w A. 124% INVENTOR. BY JQMM 1%» United States Patent Office 1 3,058,939 LAMINATED MAGNETEC STRUCTURE, AND PROCESS FDR MAKING SAME William A. Ray, North Hollywood, Caiih, assignor to 3,958,039 Patented Get. 9, 1962 2 FIG. 4 is a side view of the stacks illustrated in FIG. 3; and FIG. 5 is a fragmentary pictorial view illustrating one of the welded ridges of the stack of laminations. General Controls (10., a corporation of California The laminations 1 are shown in this instance as E-shaped, having outer arms 2 and 3, a central arm 4 and a base member 5. The space between each of the outer arms 2 and 3 and the center arm 4 is arranged This invention relates to magnetic laminated structures. Magnetic cores for electromagnets and relays, and 10 to accommodate a winding. The stack of laminations 6 constitutes an armature adapted to be operated by alternating current, are almost Filed June 24-, 1957, Ser. No. 667,463 1 Claim. (Cl. ‘*17-198) universally made up of laminations. In many of these devices, there is a movable armature attracted by the core for the electromagnet coil. It is essential that the con tacting surfaces of the core and armature be as perfectly plane as possible, so as to cause the contact between these structure adapted to be attracted by the stack 1. In the present instance, the outer edges 16 of the arms 3 and 4 are adapted to lie on a plane 9, and to contact with the lower edge 17 of the stack 6. The upper edge 13 of central arm 4 is disposed slightly below these outer edges so as to provide ‘a relatively small gap between arm elements to be as close as possible, and thereby improve 4 and stack 6. Furthermore, each of the arms 2 and 3 the operation of the relay or magnet. is provided with a slot 7 and 8 for accommodating a Since usually the laminations are held together by fas tening means, such as rivets passing through clearance 20 shading coil. The inside projections 19 of arms 2 and 3 are also shown cut back slightly below the plane 9. holes in the laminations, it is not to be expected that the The plane 9 is intended to be parallel to and cooperate resultant surfaces formed by the edges of the laminations with plane 10 corresponding to the cooperating face of would all lie in the same plane. This is obvious because the stack of laminations 6. of the looseness of the ?t of the rivets in the clearance holes. Accordingly, it is common to grind o? these edges 25 Each of the laminations comprising stack :1 is also pro vided with one or more cars ill at a place remote from to form a geometrically true plane surface. the edges of the arms 2 and 3. The laminations 6 are It is one of the objects of this invention to obviate these also each provided with corresponding ears 12 on that expensive operations, and yet to make it possible to pro side of the laminations remote from plane 10. duce substantially true plane surfaces intended to be In preparing the stack of laminations, the upper edges placed in contact with other elements of the magnetic 16 are placed against a geometrically perfect plane 9; circuit. and one of arms 2 or 3 of each lamination is placed along In some instances, the core for the magnet coil is a corresponding plane v13 perpendicular to plane 9. They formed as an E, the ends of the arms being adapted to are temporarily held in this position in any appropriate attract an armature extending across the faces of these arms. Often the center arm is purposely made shorter 35 manner. Then the ears Ill are welded together. This welding can be effected by the heliarc or inert gas weld than the outer ones, whereby a small air gap is formed ing without the necessity of adding material. At the between it and the armature. The amount of cutback is fairly critical, and variations from the desired air gap value result in unsatisfactory magnetic operation, usual ly with a tendency to hum. it is accordingly another object of this invention to provide substantially accurately de?ned air gaps in cores of this character. completion of the welding operation, a continuous ridge 14 (FIGS. 3, 4 and 5) of welded metal is formed trans~ verse of the stack of laminations. This Welding is ac complished, of course, while the stack is held against the surfaces 9 and 13. At the completion of the welding operation, the stack may be permanently joined as by the aid of fastening In order to accomplish these results, the present in 15, such as rivets, passing through appropriate vention contemplates a Welding operation to hold the 45 means apertures 26 in the laminations. laminations in accurate alignment before the rivets are By placing the ears Jill and 12 at the outer edges of the applied. Thus haphazard variations in the stacking of laminations, the welded parts are kept substantially en the laminations prior to riveting are prevented. tirely out of the ?ux path. This invention possesses many other advantages, and The armature laminations 6 are also joined together as has other objects which may be made more clearly ap by welding the cars 12 to form the ridges 21 (FIGS. 3 parent from a consideration of one embodiment of the and 4). This is accomplished while the laminations 6 invention. For this purpose, there is shown a form in are held against the geometrically ?at surfaces 10 and 18 the drawings accompanying and forming a part of the which are mutually perpendicular. present speci?cation. This form will now be described the planes 9 and it) serve to align the edges of in detail, illustrating the general principles of the inven 55 theThus, laminations 1 and 6 to conform to a geometrically tion; but it is to be understood that this detailed descrip ?at surface; and these laminations are permanently joined tion is not to be taken in a limiting sense, since the scope while in that position. of this invention is best de?ned by the appended claim. The critical requirement of substantially accurate ?at Referring to the drawings: ness of the cooperating edges of the stacks of laminations FIGURE 1 is an elevation showing two stacks of lami 60 is readily obtained by this process. Accordingly, annoy nations which are designed to incorporate the core ing humming or inefficiency in operations may be avoided invention; without the necessity of grinding the cooperating contact 'FIG. 2 is a side view thereof; ing surfaces. FIG. 3 is a view similar to FIG. 1, but illustrating the The inventor claims: stacks joined together by a welding operation; In an electromagnetic relay structure: a ?rst stack of 3,058,039 3 identical laminations forming an electromagnet core, and each having end edges falling in a ?rst common plane to 4 preventing separating movement of the second stack of laminations. de?ne a polar area; means forming a unitary weld ex tending transversely of the ?rst stack of laminations at a place remote from said polar area to con?ne the lami nations against relative sliding movement, thereby caus ing said end edges to remain in said ?rst common plane; clamping means extending transversely through the ?rst stack of laminations, preventing separating movement of the ?rst stack of laminations; a second stack of identi 10 cal laminations forming an .electromagnet armature, and each having edges falling in a second common plane to de?ne an area for cooperation with said polar area; means forming a unitary Weld extending transversely of the sec ond stack of laminations at a place remote from its said 15 area to con?ne the laminations against relative sliding movement, thereby causing the end edges to remain in said second common plane; and clamping means extend ing transversely through the second stack of laminations, References Cited in the ?le of this patent UNITED STATES PATENTS 577,480 1,696,615 2,207,572 2,330,824 Gutmann ____________ __ Feb. 23, Trombetta ___________ __ Dec. 25, Ayers ________________ __ July 9, Gr-an?eld ______________ __ Oct. 5, 1897 1928 1940 1943 2,447,911 Mages et a1. _________ __ Aug. 24, 1948 2,488,961 2,538,036 Camilli ______________ __ Nov. 22, 1949 Ponstingl ____________ __ Jan. 16, 1951 2,762,988 Pornazal et a1 _________ __ Sept. 11, 1956 OTHER REFERENCES Holland: Abstract of Application Serial No. 755,368, published January 17, 1950, 630 0.6. 859.