US875207A - Field-magnet. - Google Patents

Description

UNITED sTATEs PATENT oEEioE. 4-

WILLIAM D. IOMEROY, OF NORWOOD, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE BULLOCK ELECTRIC COMPANY, A CORPORATION OF OHIO.

FIELD-MAGNET.

Specification of Letters Patent.

Patented Dec. 31, 1907.

I Application filed October 30` 1903. Serial No. 179,191.

vTo all 'whom it may concern:

Be it known that I, WILLIAM D. POMEROY,` a citizen of the United States, residing at Norwood, inthe countyv of Hamilton and State of Ohio, have invented certainlneW and useful Improvements in Field-Magnets, of which the following is a full, clear,- and exact specification.

M invention relates to dynamo-electric mac ines, yand particularl to machines of the revolvin field type. n these machines it isfessentia not only that .all parts should be firmly heldin place, when first assembled,

' but it is necessary to provide a construction which vwill prevent any possibility .of the parts working loose.

By my invention the coils are securely held from displacement by being clamped a ainst a coil seat which is compressible.

is compressible seat is separately removable and renewable and adapted to be easily .adjusted to a suitable size. In addition to part of a field pole in section; Fig. 2 is a section on the line of Fig. l; Fig. 8 is a bottom plan view of the coilseat casting; Fig. 4 is a sectional view on the line 4-4 of Fig. 3, and 5 is -a perspective "view, onl a reduced scale'showing a modified form of seat for 'the coil.

An arm of the revolving field structure is indicated at l and the rim thereof at 2. The

pole pieces are secured to the vrim at equal .distances apart and only'one is shown, as the structure of each is the same. The pole may be solid or laminatedand secured to the rim" 2in any of the usuallways, such as by bolt, dove-tails, etc. In the present instance I illustrate a pole made up of laminations 3 clamped together between end plates 4 b the rods 5. The pole piece thus built up is c ovetailed to the rim as indicate( in dotted lines at 6 and tightened in place by the keys 7. The laminations and end plates 4 are formed with the projectingV portions or tips 8 and each end plate is provided with the flange 9.

A continuous rim is thus formed entirely around the pole piece and effectively prevents outward displacement of the coil 10. This is shown as consisting of a conductor of large cross section wound edge-Wise, but may consist of round wire or a combination of the two. The coil is protected on the inside by the insulating cover Il and on the ends by the fiber-collars 12. The coil fits loosely over the core of the pole.

The base of the pole is encircled by the metal casting 13. This consists of a light frame which may be of cast iron and is L shape in section. It is provided with pockets 14 on .oppositesdes These may be of an size or number as is found most desirab e. fBlocks of wood 15, or other compressiblel material, are placed in pockets '14 and contact with the rim 2. the casting 13 is curved to conform to the peripher of the rim but is spaced therefrom by the b ocks 15. On each of the inner sides of the frame 18 are formed one or more projections 13 which may be filed down to form a tight fit around the core of the pole piece. When machines are so large that the curvature of the periphery is slight, I may do away with the seat as above described and use a continuous ri of wood or other compressible materiiil, such as is illustrated in Fig. 5. v

Two opposite sides of the coiland seat extend beyond the'sides of the rim and are supported on each side by end rings' 16. These are built up in ribbed form and the radial ribs 17 and the outer and inner rims 18and 19 not only make the rin s strong struc turally, .buth also form poc ets 20. These pockets are used for the urposel of balancing the machine and may e filled or artially filled with lead for this purpose.. W en it is desired to weight one side, a smallhole is bored in the pocket on the light side and the necessary amount of melted lead vpoured in when the pocket is at'its lower position.' The lead then solidifiesinthat part of the pocket which is most distant from the axis of the 'shaft' and theinclined sides will prevent displacement of the lead. Certain of the ribs are enlarged as at 21 to receive the-bolts 22, which secure 4the ring to the field frame. The periphery of the ring is inclined or tapered as at 23, and the innerlportion of the ring engages the face as well as the interior f surface of 'the rim 2 as shown at 24.

In assembling the parts, the coil and seat The bottom face of with the Wooden blocks are placed over the core of the pole piece, which is then sebination o cured by bolts, keys, or otherwise, to the frame. The blocks are madeof such depth that in securing the pole to the frame, the parts are com ressed,and' this compression causes the coil to be held rmly in place. When the blocks are made of wood, a compression of 11,16 is found to be sulicient. Afterthe poles are secured in position, the

end rin s are bolted in place andthe struc- 'j ture ba anced as above explained. V The tapered portion ofthe rings permits them to be readily placed Within the ends of the coils and seats, and when secured in position form an additional support for those parts. f

I claim asv my invention:

1. In a d namo electric machine, the combination o a frame, a pole .piece secured thereto, a coil on the pole piece, and'a separately removable compressible seat vat one end of the coil 'and encircling the pole piece.

2. In a d namo electric machine, thecombination ofy a frame, a pole piece secured thereto, a coil on the pole piece, and a'separately removable compressible seat betweenthe coil and said frame.

3. In a d namo electric machine, the coml bination ofY a frame, a pole piece secured thereto, a coil on the pole piece, and means encircling the pole piece at one end offthe .coil and comprising, se arately l`removable yieldable material, su stantially" as de-j scribed.

4. In a dfynamo electric machine, thecom- `a frame, apole piece-"secured thereto, a coil on the pole piece, and acorn# pressible seat between the coil and.' said' frame, said seatrcomprising a frame and' compressible material. p i 5. In a dynamo-electric machine, the coma frame, av pele piece secured thereto, said ole'piece having.projecting portions, a co' on the pole piece, and a com- -pressible seat between the coilmand said 4inner ends of 9. I na dynamo-electric machine,the combinatio'n of a frame, ,pole pieces, having proframe said seat comprising a frame havi pockets and compressible material in sali pockets.

6. In a d'namo-electric machine, the c'omy bination o piece secured thereto, said ole piece having projecting portions, a coilp on the pole piece, and a comprressible seat between. the coil and said ame, said seat comprising a metal frame Which encircles the pole piece, and coma frame, a pole prressible [material in pockets in said metal ame.

7. In a dl llamo-electric machine, the combination o a frame, pole 'pieces secured thereto, said pole pi'eces having projecting portions, a lco1 oneach of sai ole pieces and an.end` ring having anlinclineci) periphery which engages the inner ends of the coils.

8. In a d namo-electric machine, the combination o a frame, pole pieces secured thereto, said le pieces having projecting 1portions,.a co on each of said pole pieces and an end ring having'v pockets, the periphery of said rinlengaging and supporting the S ecol jectlnportions secured to said frame, a coil on eac pole piece, a seat of compressible material'between each coil and the frame,and an endrng having pockets, theperiphery'of said ringen'gaging'and assisting tosupport the c oi'ls.` l

' 10. In a dynamo electric machine, the combination'of 'a frame, a pole piece secured thereto, a coil'on the Eole piece, and se a rately removable yields le means located e- Atw'een the coil and said iframe, substantially as described.

.In testlmony whereof I affix mv signature,

in presence of two witn.

; WILLIAM D. POMEROY. Vllitm'asses: .A v SANFORD KLEIN1 L K. SAGER.'

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