US982830A

US982830A - Dynamo-electric machine.

Info

Publication number: US982830A
Application number: US86051107A
Authority: US
Inventors: Albert Kingsbury
Original assignee: Westinghouse Electric and Manufacturing Co
Current assignee: CBS Corp
Priority date: 1907-03-04
Filing date: 1907-03-04
Publication date: 1911-01-31
Anticipated expiration: 1928-01-31

Description

A. KINGSBURYJ DYNAMO ELECTRIC MACHINE. APPLICATION TILED MAR. 4, 1907.

Patented Jan. 31, 1911.

2 SHEETSPSBIIVIET 1:

7 9 ITNESSES'.

INVENTQR 94W AfiURNEYS A. KINGSBURY.

DYNAMU EL BGTRIG MACHINE. APPLICATION FILED HA3. 4, 1907.

Patented Janis-L 1m.

2 SHEETS-SHEET 2.

with a forced t the stationary and rotating membersfby means of a propeller attached to the shaft UNITED, STATES PA ()FFIGE.

ALBERT KINGSBURY, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR T0 WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A CORPORA'IIGN OF PENNSYLVANIA.

DYNAMO-ELEOTRIC MACHINE.

Specification of Letters I'atcnt.

Patented Jan. 31., 1911.

application filed March 4, 19072 Serial No. 360,511.

To all whom it may concern:

Be it known that I, ALBERT Knvesnnnr, a citizen of the United'States, and a resident of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in I)ynamo-Electric Machines,'of which the following is a specification My invention relates to dynamoelectric machines, and has special reference to maehinee having rotary field magnets that are adapted. to operate relatively high speeds.

. The object of my invention is to provide improved means for propelling cool air, or other ventilating fluid, through the magnetizalole core members and the windings of dynamo-electric machines in conjunction with means for so directing the fluid thus circulated to enable the windings of the machine to carry relatively large currents continuously Without excessive heating,

Steam turbine driven generators and other high speed machines are often entirely inclosed by stationary frames to which end bells are attachedin order to avoid the noise which would otherwise result from the rushing of the atmosphere through openings in these parts when the machines are in operation. In a structure of this kind, the circulation of air is established from the outside atmosphere into an outer compartmentin the end bell (which is usually provided iartition), from which point it is hrough the air gap, formed between and comprising radial vanes located substantially in the plane of the partition. Consequently, the airpasses from the outer to the inner compartment of the end bell near the shaft. 2 i

It is a Well known factthat, in any machine of the stationary armature type, the so-called end connecting portions of the Winding, which are outside the core slots, are raisedto higher temperatures by the passage of current through the windings than are. other portions of the structure by reason of the fact that a large number of conductors are here grouped together and are surrounded by air, which a relatively poor heat conductor. The quantity of heat generated at this point is, however, not excessive and, in order that the temperature of these parts may bekept normal, I pro- I vide, according to niy present invention, means forfirst directing the cool outside atmosphere through the end connecting portions of the winding and, afterward, this relatively large body of air which is raised in temperature only slightly, is forced through the core structures and windings of the rotating and stationary parts before it is permitted to escape through. suitablechan provided for that purpose Figure. l of the accompanying drawing is a partially sectional elevation, in a longitw dinal plane, or a dynanidelectric .lnachine constructed in accordance with my invenpartinents of a single end bell being shown indicative of the arrangement which may be utilized in practice at each end of the machine, and Fig, 9 an end elevation of a. portion of the machine shown in Fig. 1.

Referring to the drawings, the dynamoelectric machine illustrated comprises a stationary core member 1 which is supported by a frame 2, a rotatable core member 2) mounted on a shaft.- l, end. bells 5 and. (3 attached to the stationary trainee and air propelling devices 7. The etationary core member 1 is connecting portions 9 and parallel straight portions 10, the latter being located in the core slots 11 in a well known manner.

The stationary frame and the end bells form an. iuclosing casing for the. machine comprising a middle chamber .3? which contains the stationary and movable core members and a pair of end chambers 23 that are separated i'rtun the middle chamber by partitions 21 (only one of which is shown), and

tributed through the active parts of the machine.

cap or'bell 12 which is attached to and is of 1nuteriall v greater dianietcr than the rotating member 3 so that it covers the air-gap 13 which exists between the stationary and rotating memlurs, its outer edge being in close proximity to the inner surface of the armature core. The cup 152 is further pro vided with radial vanes 14 which may be integral with it, and which force the air into the airegap 13 when themachine is in operation. an annular opening 15 being provided adjacent to the shaft through which air is received from compartments 16 of the end tion, the ail propelling device and the coniprovided with armature coils 8 having end receive the cool air which is afterward die Each of the air propellers T comprises a propeller 19 that comprises a relatively,

' small bell attached to and located within the bell 1.2 and provided with propelling vanes 20.

The compartments 16 are located between the ends of the core members and the partitions 21, the latter being supported by radial ribs 22 and being of such shape and size as to provide ample passages between the end chambers and the middle chamber 27 near the top and sides of the

end bells

5 and 6.

The operation of the ventilating system is as follows: Fresh, cool air is taken in at the lower edges of the end bells (usually from below the floor of the power house) through

ports

28 and 29 into both the end chambers 23 and the compartments 16 of the

end bells

5 and 6, and passes directly over the endconnecting portions 9 of the armature coils. The air then enters the caps which form parts of the propelling devices 7, near the shaft 4:, and is forced, by means of the vanes 14, into the air-gap 13 so that it circulates through ventilating ducts 24 in the stationary core'member. A portion of the air which enters the bell 12 of the propelling device is forced through the longitudinal holes 17 in the rotating core member and passes therefrom through the ventilating ducts 18. The air is finally exhausted through ports 26 in annular compartments 25 which are provided between the stationary core structure and the outermost wall of the supporting frame 2 and form parts of the inner chamber 27. The exhaust ports 26 I preferably communicate with the outside air at a point considerably removed from the intake ports, fines or other suitable means (not shown) being connected to either the inlet ports or to the exhaust ports.

Itwill be understood that various structural modifications may-be effected Within the scope of my invention, and I, therefore, desire that only such limitations shall be imposed as; are indicated in the appended claims.

I claim as my invention: 4 I l/A dynamo-electric machine provided witha middle chamber having one or more side exhaust ports and containing armature and field magnets, an end chamber communicating with said middle chamber, inlet ports at one side of the end chamber and similar'in'let ports for the middle chamber adjacent to those of the end chamber.

2. A- dynamo-electric machine provided with a middle chamber having one or more exhaust ports and containing armature and' field magnets, an end chamber communicatmember and having exhaust ports communicating therewith, of side-by-side end compartments in open communication with each other near their outer peripheral Walls and having inlet ports, and means for directing currents of air from said end compartments into said air-gap and into said ventilating passages.

4. In a dynamo-electric machine, the combination with a stationary member having outside circumferential compartments, trans verse ventilating passages and one or more exhaustports that communicate with said compartments, of a rotatable member separated from said stationary member by an air gap and provided with communicating longitudinal and transverse ventilating pas-.

sages, of side-byside endcompartments in open communication with'each other near their outer peripheral walls and having adjacent inlet ports, and means for establishmg a circulation of air from said end compartments into and through said air gap and all of said passages.

5. In a dynamo-electric machine, the combination with stationary members provided with transverse ventilating passages and a rotatable ,member' provided with'longitudi nal and transverse ventilating passages, said members being separated by a material air gap, of a cap'or end bell attached to the rotatable member and provided with an annular opening near its center and with radial vanes for forcing air into said air gap, and an auxiliary cap or hell forforcing air into the longitudinal passagesjn said rotatable member.

6. In adynamoelectric machine, the combination with stationary and rotatable core "members separated by a'material air gap,

the. latter being provided with longitudinal and transverse communicating passages, and

a supporting shaft for the rotatable mem- 'ber, of amend-bell attached to the end of the rotatablemember and provided with inwardly projboti dial vanes for forcing air' into said air) m1 an auxiliary means for forcing air 1 r r the longitudinal passages 1n said-men er.

7 In a dynamo-electric. machine, the comto the end of the rotatable member and comprising an inner auxiliary bell having inwardly projecting vanes and an outer, bell-shaped member having inwardly projecting vanes the outside diameter of the main bell being greater than that of the rotatable member.

In testimony whereof, I have hereunto subscribed my name this 27th day of February, 1907. r

' ALBERT KINGSBURY. Witnesses: I

JENS BAoHE-WVfiG, 4 BIRNEY HINEs.