US1271438A - Dynamo-electric machine. - Google Patents

Description

C. S. COOK.

UYNAMO ELECTRIC MACHINE.

APPLICATION FILED Nov; 25. I914.

Patented July 2, 1918.

INVENTOR Clmrhs 5. Cool WITNESSES Jag/ax ORNEY UNITED STATES PATENT OFFICE.

CHARLES S. COOK, OF PITTSBURGH. PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A'CORPORATION OF PENNSYLVANIA.

DYNAMO-EL'ECTRIC MACHINE.

Specification of Letters Patent.

Patented July 2, 1918.

Application filed November 25, 1914. Serial No. 873,903.

To all whom it may concern:

Be it known that I, Cnanuss S. Coon, a citizen of the United States, and a resident of Pittsburgh. in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Dynamol llectric Machines. of which the following is a specification.

My invention relatesto dynamo-electric machines. and more particularly to ventilatin; structures for railway motors.

One of the objects of my invention is to provide a structure of the above-indicated character which shall be simple in arrangement and construction. eltective and ellicicnt in operation. and which shall be particularly adapted to provide a direct unidirectional circulation of ventilating air through the longitudinal ventilating ducts of the armature and through the space between the periphery of the armature and the field magnet structure.

lleretofore. when forced ventilation has been applied to railwa motors. it has been customary to a rrange t to parts in such manner that the air is taken in at one end of the motor. circulated through the air ducts in one direction and thence returned back through the air gap and discharged at the same end of the motor that it was introduced.

According to my present invention. l propose to take the air in at one end. carry it directly through the ducts and air gap in the same direction and discharge it at the other end of the machine. In order to accomplish this result I employ a double set of concentrically related fan blades which are associated with one end of the armature and are so disposed and adapted that the inner set of blades circulates air through the longitudinal ducts, while the outer set of blades .ell'ects the circulation of air through the space between the armature and field magnet structure.

'In its broadest aspect. my invention eontemplates ventilating means of the class mentioncd and is entirely independent of the particular typeof rotating and stationary members, that is, the rotor may constitute the field structure while the armature'may com rise the stator.

ll y invention may best be understoml by reference to the accompanying drawing. in which Figure l is a view, partially in section and partially in side elevation, of a portion of a dynamo-electric machine emodying my invention; and Fig. 2 is a view, partially in section and partially in end elevation, of a portion of the fan structure shown in Fig. 1.

Referring to the drawing, the apparatus shown comprises a field magnet frame 1. a plurality of bearing houses .2 and 3, a rotatable armature 4 and a fan structure 5.

The field magnet frame 1 is of the wellknown box type and is provided with a plurality of polar project-ions 6, each of which carries a field coil 7. Moreover, the frame 1 is provided with an o ening 8 at the commutator end over whici is placed a cover member 9. having a plurality of protected inlet openings 10 therein through which ventilating air may be drawn. A plurality of outlet openings 11 are also provided at the other end of the frame 1. y

The bearing housings 2 and 3 may be of any familiar type of construction and are fitted into openings 12 and 13 of the ends of the frame I and secured in position by any suitable means. The-housing 3 is provided with a plurality of sets of outletopenings 13 and 13". shaft 14 is rotatably mounted within the housings 2 and 3, bearing members 15 and 16 being" employed in accordance with customary practice.

The structural details of the armature; form no mutgpial part of my present invention, except o far as the fan structure 5 is concerned, and said armature embodies a core member 18, preferably of laminated material, a plurality of coils 19, a commutator spider 20 for supporting a commutator 21, and a coil-supportin end member which constitutes a part 0 the fan structure 5. The laminated core member 18 is provided with a lurality of longitudinally disposed ventilating ducts 23 that are pre erably arranged in staggered relation, and commutator spider 20 is correspondingly provided 100 ture coils 19 in the usual manner, and said 105 body member 26 is also provided with a plurality of openings 27 that are so disposed as to register with the several longitudinal ventilating ducts 23. The Openings 27 are elongated in a radial direction in or- 111) der to communicate with the staggered ducts 23 and are separated, the one from the other, by means of radially disposed members or blades 28 that )rojeet radially outwardly beyond the perip iery of the armature 4 and are divided into two concentric sets of blades 30 and 31 by an annular inclined deflecting partition 32.

By reason of the deflecting partition 32 and the double fan blade arrangement, the inner set of blades 31 serves to draw air into the motor through the inlet openings and thence through the longitudinal duets 23, after which it is discharged through openings 13 and 13" in the end housing 3, while another circulation of air is effected from the inlet openings 10 through the air gap, or space between the armature and field magnet structures, and thence is discharged through the frame outlet openings 11. The, inner and outer sets 31 and 30 of fan blades therefore, function to produce a direct and unidirectional circulation of ventilating air through the armature ducts and the air gap, the air being taken in at one end of the machine and discharged at the other.

Although I have, for illustrative purposes, shown and described my invention as embodymg specific structural details and arrangement and location of parts. those skilled in the art will readily understand that my invention is not so restricted, and that various modifications may be'efl'ected therein without departing from the spirit and scope thereof.

I claim as my invention:

1. A dynamo-electric machine comprising a stationary field-magnet frame having inlet and outlet openings, a rotatable armature having longitudinal ventilating duets, an end member having openings therein to row ister with said ventilating ducts and having intermediate radially disposed fan blades projecting beyond the periphery of said armature, and an annular inclined deflecting partition for dividing said blades into concentric sets for respectively effecting a circulation of air in independent paths through said dynamo-electric machine, one of said independent paths consisting of said air ducts, openings in said end member, over one set of said fan blades and through openings in said frame, said other path consisting of the air gap over the other set of fan blades and through another opening in said frame.

2. In a box-type inelosed railway motor, the combination with a frame having inlet and outlet openings respectively provided in the opposite ends thereof, bearing housings associated with the ends of said frame and one of said housings having outlet openings therein. and a rotatable armature supported by said housings and having longitudinal ventilating ducts, of concentrically related sets of fan blades associated with the end of the armature adjacent to said outlet openings, the innerset of blades being adapted to draw air from said inlet opening through said ducts and discharge it through the housing outlet openings, and the outer set of blades being adapted to draw air from said inlet opening through the air gap and discharge it through said frame outlet openings.

In testimony whereof, I have hereunto subscribed my name this 19th day of Nov.

CHARLES S. COOK. Witnesses ELLA M. Srnm,

R R. "nuns.

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