US959651A - Dynamo-electric machine. - Google Patents

Description

E. M. TINGLEY.

LED AUG. 2, 19023.

' Patented May 31,1910.

2 SHEETS-SHEET 1.

x x x E. M. TINGLEY.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED AUG. z, 1906.

959,651 Patented May 31,1910.

2 SHEETSSHEET 2.

INVENTOR gmnm 6 ,101] 222 L 2 W ATTCRNEY UNITED STATES PATENT OFFICE.

EGBERT M'. TINGLEY, OI PITTSBUBG, PENNSYLVANIA; ASSIGNOB flO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORATION 01 DYNAMO-ELECTBIC MACHINE.

To all whom it may concern:

Be it known that I, Emu-1m M. TINGLEY, a citizen of the United States, and a resident of Pittsbur in the county of Allegheny and State 0 Pennsylvania, have invented a new and useful Improvement in Dynamo- Electric Machines, of which the following is a specification.

My invention relates to dynamo-electric machines, and has s ecial reference to the rotating members of machines which normally operate at relatively high speeds.

The object of my invention is to provide such means for improvin the ventilation of rotatable core members by materially increasing the surface exposed to cooling air with a slight reduction of its useful section, as shall be simple and durable in construction and effective in operation. 7

Field ma 'net members for turboenerators, or other high speed dynamo-e ectric machines, are frequently constructed of magnetizable castings or for ings which are suitably slotted to receive t e magnetizing windings. In order to ventilate such a core structure, longitudinal holes have been bored through it and narrow circumferential slots have sometimes been provided at frequent intervals, intermediate its ends, through which cooling air has been circulated by centrifugal force. Londitudinal holes bored in such a core structure are necessarily limited in number in order to avoid both interference with the slots in which the winding is located andexcessive weakening of the structure, While the circumferential slots are objectionable because they materially reduce the core section and intersect the winding'slots. In order to materiallyincrease the ventilating surface and only slightly reduce the core section, I provide a series of strai ht, preferably round, holes which extend t rough the core structure and lie in planes substantially parallel to its axis with both ends terminating at the periphery. There is no tendency for air to circulate therethrough by reason of centrifugal action. On the surface of the core structure and at the ends of the ventilating holes, I provide projections which are so arranged as to create a circulation of air through the holes as the core member rotates. These holes do not interfere with the slots in which the winding is located and are of relatively small bore so that a large area is ex- Specifloatlon of Letters Patent. Application filed August 2, 1906. Serial Io. 388,8.

*Paeaea my 31, 1910.

posed for a given reduction in the core section. Furthermore, the ventilatin holes are close to the windi the heat has only a s ort distance to [low through the metal to a cooli surface. The projections on the surface 0 the core may have the form of scoops that faceinopposite directions, relative to the rotation of the core member, at opposite ends of a single ventilating hole. The scoops are not essentially detachable or of any specific form and it may be feasible to so form the surface of the core member as to force the air through the holes.

My invention is illustrated in the accompanying drawings, in which Figure l is a view, partially in elevation and partially in section, of a portion of a rotatable core member ventilated in accordance therewith, and Fig. 2 is a sectional View, in a plane perpendicular to its axis, of the core member shown in Fig. 1. Figs. 3, 4;, and 5 are detail views of ventilating scoops such as are outlined in Figs. 1 and 2.

Referring to the drawings, a substantiall cylindrical core member 1 is provided wit a plurality of longitudinal slots 2, in which a suitable Winding may be located, and a series of ventilating holes 3. The ventilating holes 3, as illustrated, are divided into two groups which are disposed in planes parallel to the axis of the core near the bottoms of the slots 2, but they may be disposed in more than two planes or in any manner best adapted to the form of core with which they are employed. The surface of the cylindrical core member, near the ends of the holes 3, is provided with slots 4 in which the air propellers or scoops 5 are located. The scoops 5 may comprise a plurality of units corresponding in number to the holes with which they are used, or the may comprise members which are in the orm of a series of scoops as illustrated in Figs. 3 and 4. Since the scoops at the extremlties of each ventilating hole face in opposite directions relative to the rotation of the core member air will be forced into one end of the hole and allowed to escape from the other end as the core member rotates. The scoo s 5 may project a material distance from t e surface of the cylindrical core member since'a considerable air gap is usually provided in high speed machines employing core members of the character described, and they to be coole so that l are made relatively heavy and substantial to avoid injury when the core is assembled or transported.

Although I have shown the ventilating arrangement of my invention only in connection with a cylindrical core member which is adapted for use with a bipolar machine, I desire that its use shall not be restricted thereto since it may be readily applied to various other forms of rotatable core mem-' bers for two or more poles, within the scope of my invention.

I claim as my lnvention:

1. In a dynamo-electric machine, the combination with a rotatable member having ventilating holes which extend therethrough substantially perpendicular to its axis, of deflectors at the ends of each hole which project laterally therefrom and have openings at the same side.

2. In a dynamo-electric machine, the combination with a rotatable member having a series of ventilating holes disposed in one or more planes substantially perpendicular to its axis, of guides at the opposlte ends of each hole which have a similar inclination with reference to the center line of the hole in order to direct the air into one end of the hole and out of the opposite end, when the member rotates in either direction.

3. In a dynamo-electric machine, the combination with a rotatable member having holes for ventilation which are transverse to its axis, of scoops which project from the member near the ends of the holes with their openings oppositely disposed relative to the direction of rotation of the member.

4. In a dynamo-electric machine, the combination with a rotatable core member having a pluralit of Ion itudinal slots, and a series of venti ating ho es extending through the core member and substantially perpendicular to its axis, of a pluralityof scoop projections located on the surface of the core member near the ends of the ventilating holes, and means for holding the scoop projections in position. 1 a

5. In a dynamo-electric machine, the coin bination with a rotatable core member having ventilating holes which extend transversely therethrough and terminate at its periphery, of scoops at the opposite ends of each hole that project oppositely with reference to the direction of rotation, for creating a circulation of air through the holes as the core member rotates.

6. In a dynamo-electric machine, the combination with a rotatable core member having transverse ventilating holes which terminate at its eriphery, of deflectors which project opposltel from the ends of the respective holes, with respect to the direction of rotation.

7. In a dynamo-electric machine, the combination with a rotatable core member having transverse ventilating holes which terminate at its periphery, of deflectors which project from the surface of the core member near the ends of the holes and face in opposite directions relative to the rotation of said core member.

In testimony whereof, I have hereunto subscribed my name this 31st day of July EGBERT M. TINGLEY. Witnesses JOHN M. FITZTHUM, BIRNEY HINES.

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