US678168A - Magnet-coil. - Google Patents

Description

m B IN u l d e t n e t a P N E M T M .6 F A H 8 m 8 7 6 o N (Application filed Apr. 22, 1901.)

2 Sheets-Sheet I.

(No Model.)

Wrtnessas:

Inventor. Hermann FT. Erban.

No. 678,!68. Patnted July 9, IBM. H. F.'T. ERBEN.

MAGNET COIL.

gApplication filed Apr. 22, 1901.) (No Model.)

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UNITE STATES PATENT ()FFICE.

HERMANN F. T. ERBEN, OF SOHENEOTADY, NEW YORK, ASSIGNOR TO THE GENERAL ELECTRIC COMPANY, OF NEW YORK.

MAGNET-COIL.

SPECIFICATION forming part of Letters PatentNo. 678,168, dated July 9, 1901.

Application filed April 22, 1901.

To all whom it may concern:

Be it known that I, HERMANN F. T. ERBEN, a citizen of the United States, residing at Schenectady, in the county of Schenectady,

State of New York, have invented certain new and useful Improvements in Magnet- Ooils, (Case No. 1,769,) of which the following is a specification.

This invention relates to improvements in IO ventilated field-coils for electric machines, in accordance with which a practical commercial machine can be built in such manner as to increase its output and to possess in a high degree all the advantages well known to those I 5 skilled in the art of ventilated or air-cooled coils.

In accordance with the invention a most economical and efficient structure is so modified, without detracting from its advantages,

as to provide ample means for cooling the coils by currents of air. The embodiment of the invention shown herein may be changed so as to be adapted to different uses; but as at present constructed it is applied and utilized in a field-magnet for electric machines and the magnet constructed in accordance with the invention is mounted on its polepiece in any suitable manner which may be desired. There may be a greater or less number of such magnet-coils for each machine, in

accordance with the capacity which the machine is designed to possess. The coils may constitute a portion of a stationary field or they may be mounted on a rotatable spider,

3 5 according to the well-known practice, but in the latter case the conductors, which become heated, are subjected to a greater amount of air-currents.

It has long been known that field -coils could be kept comparatively cool by so constructing them that the conductors would be exposed to air-currents, and several different structures have been suggested for obtaining this end. None of these, however,

has been well adapted for commercial application, and therefore I have devised the construction herein described, which is now being embodied in exactly the manner shown in a large number of electric machines of size.

This construction is such that the cost of manufacture is as low as is consistent With a Serial No. 56,825. (No model.)

durable machine part, and at the same time it is possible for any given machine to possess to a very high degree all the advantages attendant upon the use of ventilated fieldcoils.

In carrying out the invention a sheet-iron cylinder is provided as a support or spool upon which the coils are to be wound, and suitable insulation is then placed around the spool; but before the winding is done, however, separate insulating-collars are loosely mounted upon the spool, and starshaped rings provided with radial arms are secured to the ends of the cylinder. These insulatingcollars are formed with one or more annular series of lateral perforations or openings, and the arms of the end rings abut against the collars between successive openings of the series. A portionof the coils is wound about the insulated spool, so as to fill the space between the insulatingrings and force the latter against the arms of the endrings. After a portion of the coils has been wound spacingstrips are laid upon such portion, so as to extend longitudinally from end to end of the. winding and engage with the insulating-collars to force them against the end rings and remove the strain from the winding. The ends of these strips abut against the portions of the collars between successive lateral openings of the annular series, and hence the strips are also in alinement with the arms of the end rings, which arms abut against the opposite sides of the insulating-rings,between the perforations therein. The winding of the coils is continued over the spacing-strips, and, if desired, for certain machines additional spacing-strips may be put in place over the second portion to be'wound. In any case the series of spacing-strips arranged annu-, larly around the spool serve to provide ventilating-spaces between the different portions of the coils, and it will be seen that such spaces are in alinement with the openings in 5 the insulating-collars and with the spaces between the arms of the end rings, so that the result is a plurality of air-passages, which extend from end to end of the windings'and through the separate insulating-collars and end rings.

Of the drawings, Figure 1 is an end view of a completed field -coil, a portion of the structure being broken away to show the windings. Fig. 2 is a section of a portion of the same along the line X X of Fig. 1. Fig. 3 is an end elevation of a slightly-modified form of coil, a portion being broken away to show the windings themselves; and Fig. 4: is a section of a portion of the same along the line Z Z of Fig.

The spool P of the apparatus comprisesa sheet-metal cylinder which has its ends D notched and turned back outwardly, so that they extend radially. A portion adjacent to each end of the cylinder or spool is beaded, as shown at B, in order to form exterior annular ribs. Suitable insulation 1, which may be of fiber or paper or any other desirable material, is put in place around the spool, and insulating-collars O are loosely mounted on the spool over this insulation. These collars are preferably composed of several strips or disks of wood with the grains opposed, which are secured together in order to prevent warping. The completed ring has formed in it one or more annular series of lateral perforations or openings H. After the insulating-collars C have been placed over the spool malleable-iron rings R are slipped over the uninsulated ends of the cylinder and are pushed up against the beaded portions 13. The ends of the cylinder I are then notched, as shown in Figs. 1 and 3, and bent outwardly, so that they extend radially, and these upturned ends are secured to the ring R by suitable means, such as rivets V. The'rings R are so arranged circumferentially that the radial arms with which they are provided abut against the portions of the insulating-collars (J which lie between successive lateral openings H.

The structure is now ready for the winding of the coils, and in the device shown in Figs. 1 and 2 a fiat copper strap is wound over the insulation I to constitute the series coils, the turns being of course separated from each other by suitable strips of insulation unless the copper strips are connected in parallel. This winding extends radially up to the lat eral openings H of the insulating-collars O, and after the winding is completed a series of spacing-strips K are placed annularly around the winding. These spacing-strips are disposed longitudinally from end to end of the winding between the insulating-collars C and are so located that their ends abut against the portions of the insulating-collars which lie between successive openings to force the insulating-collars against the arms of the end rings. Hence it will be seen that the strips are in alinement with the arms A of the end rings. Upon these annular series of spacingstrips K is wound the shunt-coil N, which is composed of ordinary insulated Wire. This winding is continued up to within a short distance of the ends of the insulating-rings, and the outside of the coil maybe suitably wrapped with protecting insulation in any well-known manner. It is thus clear that the spacingstrips provide a plurality of ventilating-openings, which extend continuously throughout the length of the winding-space between the series coil E and the shunt-coil N and also through the lateral openings in the insulating-collars and have free access to the outside air between the arms A of the rings B. As shown in Fig. 1, suitable terminals L are provided for the series coil E and terminals L for the shunt-coil N.

The construction shown in Figs. 3 and a is similar to that shown in Figs. 1 and 2, except that there are two annular series of spacing strips K, and consequently twoannular series of lateral openings 11 in the insulatingcollars G. Furthermore, the arms A of the rings R are longer in consequence of an iucreased width of the collar 0, and an outside rim R connects the ends of the arms together in order to strengthen the structure. Also, as shown in Fig. 4, the shunt and series coils are not wound concentrically, but each coil occupies its own longitudinal space along the length of the spool. In order to separate and insulate the series and shunt coils from each other, a third insulating-collar, O, is loosely mounted over the insulation 1, and this collar is provided with an annular series of perforations in the same manner as the end collars O. As in Figs. 1 and 2, spacing-strips K form Ventilating-spaces; but the strips are interposed between portions of the same coil. Thus the innermost portion of the coil N is Wound and the series spacing-strips are placed thereon, and the winding is continued, but over these spacing-strips. The series coil E, composed of a copper strap, is also wound in the same manner.

What I claim as new, and desire to secure by Letters Patent of the United States, is-- 1. A magnet for electric machines, which comprises a spool, coils wound thereon, spacing-strips interposed between different coils to form ventilatingspaces, independent insulating-collars adjacent the ends of the coils, said collars being formed with one or more annular series of lateral openings registering with the ventilating-spaces, said spacingstrips abutting against the portions of the collars between the successive lateral openings, and rings on the ends of the spool, said rings being provided with radial arms each of which arms extends adjacent to its collar between two successive lateral openings, and hence in alinement with a spacing-strip.

2. A magnet for electric machines, which comprises a spool, independent insulatingcollars loosely mounted thereon, spacingstrips separating the collars, coils wound between the collars and having ventilatingspaces formed by said strips, and rings on the ends of the spool which hold the collars against the ends of the spacing-strips, said collars and rings being constructed and arranged to permit free access of outside air to the ventilating-spaces.

3. A magnet for electric machines, which comprises a spool, coils wound thereon so that different portions are separated by ventilating spaces, independent insulating collars mounted on the spool adjacent the ends of the coils, said collars being provided with annular series of lateral openings corresponding and registering with the ventilatingspaces, and rings on the ends of the spool, which are provided with radial arms, each arm extending adjacent to its collar between two successive lateral openings.

t. A magnet for electric machines, which comprises a spool, independent insulatingcollars loosely mounted thereon, rings on the ends of the spool, and coils wound on the spool between the collars in such manner that ventilating-spaces are formed, said collars and ring being constructed and arranged to permit free access of air to the ventilatingspaces.

5. A magnet for electric machines, which comprises a spool, coils wound thereon so that different portions are separated by ventilating spaces, independent insulating collars mounted on the spool adjacent the ends of the coils, said collars being provided With annular series of lateral openings corresponding and registering with the ventilating-spaces, and rings on the ends of the spool which are constructed and arranged to permit free access of outside air to the ventilating-spaces.

6. A magnet for electric machines, which, comprises a spool, coils wound thereon, spacing-strips extending longitudinally of the spool and interposed between portions of the coils to form ventilating-spaces, and independent rings secured to the ends of the spool, said rings being provided with radial arms which retain the coils in position on the spool and share coincident radial space with the spacing-strips,whereby the entire ventilatingspaces between said strips are open to the outside air.

7. A magnet for electric machines, which comprises a spool, coils wound thereon so that different portions are separated by ventilating-spaces, and independent rings secured to the ends of the spool, said rings being provided with radial arms which retain the coils in position on the spool and permit free access of outside air to the ventilating-spaces.

8. In a magnet for electric machines, the combination with a spool,of coils wound thereon so that ventilating-spaces are formed between different portions thereof, the ends of the spool being extended radially, and rings secured to the extended ends of the spools, each ring being formed with radial arms which secure the coils in position and are separated from each other to permit free access of the outer air to the ventilating-spaces.

9. In a magnet-coil for electric machines, the combination with a spool, of coils wound thereon so that ventilating-spaces are formed between diiferent portions thereof, the ends of the spools being extended radially, annular ribs on the outside of the spool adjacent to the radially-extended ends, and rings secured between the ribbed and radially-extended portions of the spool, each ring being formed with radially-extending arms which hold the coils in place and are separated from each other to permit free access of the outer air to the Ventilating-spaces.

10. In a magnet for electric machines, the combination with a sheet-metal spool having radially-extending end portions, of rings secured to said portions and provided with radial arms, insulation around the spool, coils wound around the insulation, and spacingstrips extending from the coils longitudinally in alinement with the arms, whereby Ventilating-spaces are formed through the coils and rings.

11. In a field-magnet for electric machines, the combination with aspool, of rings mounted on the ends of the spool and provided with radial arms, three independent insulatingcollars loosely mounted on the ring and formed with one or more annular series of perforations, a series coil comprising a copper strap wound on said spool, a wire shuntcoil wound on said spool, and spacing-strips extending between the solid portions of the collars to form ventilating-spaces.

In witness whereof I have hereunto set my hand this 19th day of April, 1901.

HERMANN F. T. ERBEN. Witnesses:

BENJAMIN B. HULL, MARGARET E. WOOLLEY,

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