US879949A - Coil-retainer for dynamo-electric machines. - Google Patents

Description

No. 879,949. PATENTED FEB; 25, 1908.

I G. DUNN. con RETAINER FOR DYNAMO ELECTRIC MACHINES.

APPLICATION FILED JUNE 3. 1907.

Fig. i.

\/T w I U! 9 WVifthesSaai Inventor,

. shown in one of the slots and locke UNITED STATES PATENT OFFICE.

GANO DUNX, OF EAST ORANGE, NEW JERSEY, ASSIGNOR TO (ROCKER-WHEELER COMPANY,

' OF AMPERE, NEW JERSEY, A CORPORATION OF NEW JERSEY.

' Specification of Letters Patent.

Patented Feb. 25, 1908.

Application filed J'unc3- 1907. Serial No. 376.992.

To all whom it may concern:

' Be it known that I, GANo DUNN, a citizen of the United States of America, and a resident of East Orange, county of Essex, and State of New Jersey, have invented certain new and useful Improvements in Coil-Retainers for Dynamo-Electric Machines, of which the following is a specification.

The object of this invention is to provide a device for securing the coils or windings in the slots of dynamo-electric machine elements, the devices being of simple construction and inexpensive material, easy of application irrespective of the length of the slots, and reliable, so formed that they will not increase the self-induction of the windin s, will have negligible magnetic losses, wil be tree from eddy currents of moment, and will not obstruct the heat radiation.

In the accompanyin sheet of drawings which forms a part of this application, Figure 1 shows a portion of the face of an armature with a slotted core in which windin s are with coil-retainers embodying my invention. 'Fig. 2 shows a portion of the end of the armature with the coil-retainers in edge view and the locked windingsin section. Fig. 3 shows one form of such coil-retainer with narrow middle section drawn to larger scale. Fi 4 shows a perspective view of a tool suitab e for applying this form of coil-retainer. Fig. 5 shows another form of coil-retainer constructed to be locked by a tool with a screwdriver end. Fig. 6 is a persepctive view of a tool suitable for applying the form of coilretainer of Fig. 5.

The invention is illustrated in connection with an armature, the core of which consists of circular iron punchings A with peripheral slots as shown. \Yhen these punchings are laid to other in sufiicient numbers the slots forme thereby have considerable length and in these slots the customary windings V are laid. In the side walls of each slot and near the mouth are notches n it into which the coil-retainers C-O lock. These coil-retainers are conveniently punched from sheet metal. Metal is referable to any vegetable fiber, because 0 the shallow space required above the windings for a retainer of suificient strength. Metal is preferable, also, because of ermanency of form, there being no shrinliing or loosening through drying, and it is less of an obstruction to the conduction and radiation of heat from the windin s. iron or brass is usual y to be preferred. Iron is the least expensive and it has greater strength and electrical resistivity, while brass, for example, avoids aslight increase in self-inductance which would-be. caused by iron. German silver, zinc and other metals may be substituted with some advantages both as to dia-magnetism and electrical resistivity.

The invention is not to be regarded as limited. to any particular form, provided that it is constructed for insertion into the slot from the face instead of being slid in from the end, and is brought into engagement by a tool which acts on the coll-retainer, preferably in a rotative manner, to brin it into locking engagement with the notches in the slot walls. Two forms are illustrated, a form C with a narrow middle section and enlarged ends in Fig. 3, and a form C. like a frame with two diagonal corners rounded and a rectangular centralopening, suited for engagement by a square ended tool or screw-driver. The form of Fig. 3 affords less opportunity for circulatory currents, and is on this account to be preferred. It is set in place by a tool T with double tongues t t which engage either side of the narrow middle section. The outside dimension as taken on the axis (1-?) between inclosing parallel lines is less than the width of the slot, and the outside dimension as taken on the axis cd is equal to the distance apart of the bottoms of opposing notches in the slot walls. which lies intermediate of the other two axes, thc two diagonal corners of the coilretainer are'rounded so as to leave this dimension preferably slightly in excess of the distance between the bottoms of the notches so that the spring of the material of the armature core and of the coil-retainer will allow these corners to pass the bottoms of the notches in revolving the coil-retainer, but such excess along this axis is not essential. The other two diagonal corners are not rounded and prevent further rotation of the retainer after the axis c-d' has been brought directly across theslot. A number of coilretainers are usually required in each slot at spaces generally from two to six inches according to the weight and character of the windings, centrifugal ,force, width of the Of the metals,

On the axis ef slot, and bending :DIOIOIBBT, of the coil se teinersf The slot insuietion may betui'ned down and folded over the windings prior to the pressing down and engaging of the 500i retainers, in which case the notches will he deer, or the coil-retainers may be inserted between the wefls of the siot lnsulation in Wiiicheese the coil-Ieteinersieedil'yout this invention is not limited to the involving eieznents or armetures of direct current machines, nor to elements which have the siots for the windings in their convex feces.

What I claim as new and desire to'secure hy Letters Patent of the United Statesis:

1, The combination of e s1otteddynen1oeiectric machine element, windings located,

in the slot, and'a coih'eteinerconstrueted to admit of passage into the slot from the face of the element, end for-locking into the Walls of the slot by rotation, substantially as described.

ted impedes accidental nniockingof the emeee The eonihinetion of a slotted dynemoeiectrie machine element, the wens of the siotsneei then months being notched, e -1ndings locsted in the slots, and a coil-nominee with" e middle section shaped for engagement with a snitebie key, the outside dimension along onesxis being less than the Width of the slot, and the outside" dimension elong another. axis being equal to the dis-= tense apart of the bottoms of opposhig notches, suhstentieily as described.

3. The combination of s siotted dynsnioelectiic machine element the Walls of the slots near their months being notched, Windings located in the slots, and e coil-retainer having narrow middle section and enlarged ends with the middle vsection shaped for engegement with e suitable key, the ontsiih dimension eiongone axis being less than the Width of the slot, and the outside dimension along another exisbeing equal to the distance. apart oi the bottoms of opposing notches, substantially as described.

Signed by me at Ampere, New Jersey, this 31st day of May, 1907. GANG DUNN 'Witnesses:

His-MW J. FULLERT B. HAnRIsoN.

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