US 1361136 A
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DYNAMO ELECTRIC MACHINE.
APPLICATION FILED FEB. 6. 1917.
Patented Dec. 7, 1920.
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DYNAMO ELECTRIC MACHINE. APPLICATION FILED FEB. 6. 1917.
Patented Dec. 7, 1920.
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JAMES BURKE, 0E ERIE, PENNSYLVANIA, ASSIGNOR T0 BURKE ELECTRIC COMPANY, A CORPORATION OF PENNSYLVANIA.
Specification of Letters Patent.
Patented Dec. '7, 1920.
Application filed-February 6, 1917. Serial No. 146,884.
' T 0 all lwhom, it may concern.'
Be it known that I, JAMES BURKE, a citizen of the United States, residing at Erie, in the county of Erie and State of Pennsylvania, have invented certain `new and useful Improvements in Dynamo-Electric Machines, of which the following is a specification.
My invention relates to an improved method and form of construction of dynamo electric machines which is especially applicable to comparatively small sizes of motors, generators and the like.
The main objects are to simplify the method of construction and reduce the amount of labor necessary and also reduce the cost of material while producing a strong and durable construction with reduction of size and weight of the machine.
My invention will be understood from the following description and accompanyinfr drawings, in which- Figure 1. is a cross section illustrating one stage of manufacture; Fig. 2 is an end view of Fig. 1; Fig. 3 is a cross section of a further stage of manufacture; Fig. 4 is an end View of the construction illustrated in Fig. 3 with the auxiliary clamping and shaping means removed; *ig 5 is a plan showing the outline of the sheet lnetal base; Fig. 6 is a plan .View of the base after being bent to its iin'al shape. Fig. 7 is an end view of Fig. 6; Fig. 8 is a side View of Fig. 6; Fig. 9 is a plan view of the completed Fig. 10 is an end View thereof.
Instead of providing the usual heavy cast iron frame which is'costly in material and labor, I utilize sheet metal of commercial gage and shape the same to fulfil the function of supporting and protecting the operative parts of the machine. In accordance with my invention the main frame is made in its preferred form from a rectangular sheet of steel, the4 size of the rectangle being cut to that suitable to the particular dynamo desired. The rectangular sheet is then rolled circular shape bringing the two ends of the rectangular sheet near together. Any suitable holding or clamping means is then used for holding the sheet in its final form, such as the two encircling rings 11-11, the size of which are of proper standard for the size of the dynamo desired. The size is such as to bring the two edges of the sheet 12 together forming a joint as at 13, An end ring 14 is then placed Within the circular frame and fixed in place at the proper distance from one end of the circular frame, preferably by arc welding at spots displaced around the periphery as indicated at 15. The welding of this end ring in place serves to retain the circular 'sheet metal frame in proper shape. In some instances it may be desirable to weld togetherthe edges of the circular frame along the joint 13, but ordinarily this is unnecessary. l
The stator laminae 16 may now be assembled within the housing or may be separately assembled or built up on positioning p ins or other form, and forced within the circular frame against the end ring 14. Another ring 17 is applied on the opposite end of the laminas. The laminee are then forced and held together in any suitable way until the ring 17 is located at the proper predetermined distance from its end of the circular frame and is then arc welded iii spots 15 to the circular frame, in the same manner as the end ring 14. As one method of clamping the lamin together so as to permit the ring 1.7 to be brought to its intended position, two flanges or spiders 18 are shown, one on each side of the laminee, and a bolt 1.9 and nut 20 for compressing the laminee to any desired amount. After the ring 17 is welded in position, the clamping means and the rings l1 maybe removed. This completes the stator frame and housing, no machine work being necessary,leXcept truing up the edges of the housing by placing the parts in a mandrelso that the edges of tho housing will be at right angles to the axis of the rotor. I
The base or foot of the machine is also preferably formed of a single piece of sheet metal. A sheet of steel is first punched to the shape shown in Fig. 5 with a central opening and diagonal cuts as shown at 21 and with end projections 22 and slots 23. The, part-s 24 between the cuts 21 are iieXt bent upwardly so as to form projecting lips as shown in Figs. 6 and 7. The side p0rtions 25 of the sheet metal are then rbent downwardly on the horizontal dotted lines shown in Fig. 5 and the end projections 22 are bent downwardly on the line of the vertical dotted lines. This gives the final forni of the base or foot as shown in Figs. 6, 7 and 8, the slot 23 serving to provide/means for bolting the machine in any desired location. The side portions of the foot have a circular recess as shown in Fig. S which is of a radius adapted to lit around the circular sheet metal housing of the dynamo; and the lips 2l are also of such length as to reach the circular housing ot the machine when placed in position on the base. The base is now welded to the housing by arc welds along the upper edges of the lips 2l and along the line of Contact with the side portions oi' the base.
The shape or forni of the foot or base may be made as desired to suit the particular use to which the machine is to be put, without the necessity of altering the housing which is another advantage over cast frames which require a separate pattern for the housing and base for each different torni otl base even with the same size ot machine or housing. I l
The completion of the dynamo by the provision of stator windings and of the rotor is made in the usual manner, the end frames 26, 2G for supporting the rotor shaft, brushes, etc., being fitted to the ends of the sheet metal housing and bolted together or in place in any desired manner, such as by through bolts passing through holes in the stator laminae.
Although I have described one embodiment of my invention, it will be understood that various modifications may be made without departing from the scope thereof.
l. In a dynamo, the combination of a cylindrical housing consisting of a single rectangular sheet of metal bent to have a single butt joint, and a ring secured therein and serving both to hold the said housing in shape and as an abutment to secure the stator laminae.
2. In a dynamo, the combination of a sheet metal housing consisting ot' a single sheet of metal having a single longitudinal butt joint, a retaining ring for the stator laminae secured to said housing, and a second retaining ring for the stator laminte secured to said housing.
3. In a dynamo, the combination of a cylindrical sheet metal housing, a retaining ring for the stator laminae within said housing, said ring being autogeneously joined to said housing, a second retaining ring for the stator laminte for retaining said laminze in position, said last mentioned ring being autogeneously joined to said housinO', and end frames for supporting the rotor shaft positioned on the ends ot' said cylindrical housing. f
et. In a dynamo, the combination of a housing, and a sheet metal base secured to said housing, said 'sheet metal base consisting of a plate having an opening therethrough and having its inner edges bent up to form a seat and its outer edges bent down to form a box like support.
.3. In a dynamo, the combination of a housing, and a sheet metal base secured to said housing, said sheet metal base comprising' a plate having an opening therethrough and its inner edges bent up to form a seat.
6. In a dynamo, the combination of a housing, and a sheet metal base secured to said housing, said sheet metal base consisting of a plate having an opening therethrough with its inner edges bent to conform to the outline of said housing and secured thereto.
7. In a dynamo, the combination of a housing, and a sheet metal base secured to said housing, said sheet metal base being formed of an integral sheet having sides and ends bent at right angles and also having an opening therethrough with its edges shaped to conform to the outline of the housing and secured to said housing.
8. rIhe method of making a stator clement for dynamos which consists in bending a sheet of metal to form the housing', welding a ring within said housing, meanwhile holding the housing in shape by means of a temporary ring slipped around it, placing stator laminre within said housing against said ring, and Vwelding another ring within said housing on the other side ot' said laminae from said first ring. and then removing the temporary ring.
9. rI'he method of making a stator ele- `ment for dynamos which consists in bending a single rectangular sheet of metal in cylindrical form with its ends butted together to form the housing, holding the housing in shape by means of a temporary ring slipped around it, securing an abutment ring within said housing, placing stator, laminae within said housing against said abutment ring, --securing another ring within said housing on the other side of said laminae, said rings within the housing serving to hold the shape of the housing, and then removing the temporary outer ring.
l0. Inl a dynamo, a cylindrical housing of a single piece of metal with a single longitudinal butt joint, a ring therein, said housing and ring` being autogeneously joined together, and stator lamina; abutting against said ring. Y
ll. In a dynamo, the combination of a cylindrical housing and a sheet metal base to receive the same, said base consisting of' a sheet metal plate having an opening therethrough, the edges of said opening being turned up to make a seat conforming to the cylindrical contour of the housi-ng and said edges being autogeneously joined to said housing.