Armature for electric machines
US 505926 A
Description (OCR text may contain errors)
(No Model.) 2 Sheets-Sheet 1.
A. SC.HMID. ARMATURE FOR ELECTRIC MACHINES.
No. 505,926. Patented Oct. 3, 1893.
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A. SCHMID. RE ICR ELECTRIC ARMATU No. 505,926. Patented 001;. 3; 1893.
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ALBERT SCI-IMID, OF PITTSBURG, PENNSYLVANIA.
ARMATURE FOR ELECTRIC MACHINES.
SPECIFICATION forming part of Letters Patent No. 505,926, dated October 3, 1893.
Application filed November 3, 1892. Serial No. 450,881- (No model.)
To all whom it may concern:
Be it known that I, ALBERT SoHMID, a citizen of the United States, residing in Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Armatures for Electric Machines, (Case No. 493,) of which the following is a specification.
The invention relates to the construction of armatures or field-magnets of electric generators and motors, the object being to simplify and improve the construction.
The improvements are especially useful in machines of large size.
The invention consists principally in the novel form and method of constructing and supporting the poles or pole-pieces of the machine.
It has been customary heretofore to construct armatures from plates or sheets of metal stamped in shape to correspond with the cross-section of the armature, a sufficient number of these plates being laid together to build up the entire armature core. In the case of large machines especially this is a difficult and expensive plan of construction.
My invention consists in constructing the main portion or body of the armature or the field-magnet in the form of a ring or wheel of proper dimensions, suitable recesses being provided for receiving the pole-pieces of the armature. The pole-pieces themselves and the principal magnetic portions are formed of sheet metal stamped to the proper size and shape, and built up and mounted in the openings in the ring designed to receive them. The shapes of these pole-pieces and the details of construction will be described more particularly in connection with the accompanying drawings.
In the drawings Figure 1 is a side elevation of a portion of an armature and corresponding portion of the field-magnet of a machine, the improvements being shown in the'section of the armature. Fig. 2 is a cross-section along the line a, m, Fig. 1.
Referring to the figures, A representsa portion of the body of the armature core which is constructed inaringform and is supported by spokes. This ring portion is formed with openings preferably T-shaped as shown at B. The principal :magnetic portion of the armature is built up of laminae of soft iron and is supported by the ring A. The plates or laminm are secured together by bolts (1, or in any other suitable manner. In large machines, especially it is desirable to form the magnetic portion 0 in. sections a as shown in Fig. 1. Each section may contain one entire pole c and a half of each of the adjacent poles c 0 These sections 0 are formed with arms 6 having lugs e which enter corresponding lateral openings B in the ring. YVhen the sections are placed in the ring A, the ends of the adjacent sections fit against each other along the linesf, making a complete series of poles about the armature ring. A suitable filling material, such as Babbitt metal or molten lead is then poured in around the portions entering the armature ring as shown at 9, thus securely fastening the entire pole structure into the ring. circuit from pole to pole is complete through the structure of the pole sections independently of the supporting ring A, each section being approximately H shaped with the addition of an intermediateprojection on one side forming a tooth or pole. The central portion of each section may stand clear from the body of the ringAleavin g an open space between the two, through which air is free to circulate, thus cooling the insulation.
.The shapes of the pole-pieces or teeth may be variously modified as found convenient and desirable in different cases. The form shown in the drawings is provided with lateral projections c beneath which the armature coils K are placed. These coils may be Wound in position, or they may be previously wound and insulated and then placed over the ends of the pole-pieces and pressed into position beneath the projection 0 The fieldmagnet to which this armature is applied may be of any suitable construction. In the drawings I have shown afield-magnet ring lWI, having poles m, projecting therefrom and supplied with coils m secured thereto in any convenient manner.
' It will be understood that although I have described the invention more particularly in connection with the armature, oftentimes it may be desired to construct the revolving portion of the machine as a field-magnet, and the invention will be of course applicable It will be seen that the magnetic thereto, and. likewise certain features of the invention are applicable to the stationary portion of an electric machine whether field-magnet or armature.
I claim as my invention 1. In an electric machine the combination of a supporting ring having transverse openings, polar projections consisting of plates secured therein, each plate containing one complete coil receiving tooth and fractions of two other similar teeth, substantiallyas described.
2. In an armature for an electric machine, radiating polar projections formed of sheet metal stamped to the proper size and shape and fastened together face to face, a support therefor consisting of a ring having transverse openings, and a shaft carrying the ring, substantially as described.
3. The combination with the supporting ring A, having the openings B, of the polar teeth C built up as described, and having the ALBERT SGHMID.
JAMES WM. SMITH, HAROLD S. MACKAYE.