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Патент USA US2404979

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July. 30, 1946.
E. O. MUELLER ET AL
2,404,979
SPLASHPROOF TRACTION MOTOR
Filed Jan. 29, 1943
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SPLASHPROOF TRACTION MOTOR
Filed Jan. 29, 1943
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July 30, 1946-
E. 0.‘ MUELLER ET AL
2,404,979"
SPLASHPROOF TRACTION MOTOR
Filed Jan. 29, 1945
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Patented July 30, 1946
2,404,979
UNITED STATES PATENT OFFICE
2,404,979
SPLASHPROOF TRACTION MOTOR
Erich 0. Mueller, Irwin, and Richard H._Wagner,
Edgewood, Pa., assignors to Westinghouse Elec
tric Corporation, East Pittsburgh, Pa., a cor
poration of Pennsylvania
Application January 29, 1943, Serial No. 473,916
' 4 Claims.
(01. 172—-36)
The present invention relates to electric mo
tors, and more particularly to splashproof trac
tion motors for electric railway use.
The principal object of the invention is to
provide an electric motor which is designed to
prevent the entrance of splashing water, or other
foreign substances, through the ventilating open
ings, without materially restricting the free ?ow
of ventilating air.
2
ing frame I, which may be either cast or fabri
cated, and which is generally octagonal in
cross-section in its central portion, as shown in
Fig. 2. Main pole pieces 2, on which are sup
ported main ?eld windings 3, and commutating
poles 4 carrying commutating windings 5 are
mounted on the interior of the central portion
of the frame in any desired manner, as by mount
ing bolts 6.
More speci?cally, it is an object of the inven 10
The motor has a shaft 1 which is supported
tion to provide an electric traction motor for
in roller bearings generally indicated at 8. The
electric railway use in which the openings through
bearings 8 are mounted in end brackets 9 which
which the ventilating air is discharged are located
completely enclose the ends of the motor, and
in air chambers which are arranged to prevent
which are secured in the frame I by bolts H], or in
the entrance of splashing water into the motor 15 any other suitable manner. The shaft ‘I carries
without seriously obstructing the flow of the air.
a laminated rotor core II which is provided with
Railway motors are usually mounted directly on
axial passages I 2 for ventilating purposes, and
the trucks of the car or locomotive which they
which has slots in its peripheral surface in which
drive, and are therefore more or less exposed to
an armature winding I3 of any suitable type is
weather conditions. Such motors are usually sub~ 20 placed in the usual manner. The armature wind
stantially completely enclosed, but provision must
ing I3 is connected to a commutator I 4 mounted
be made for the discharge of the ventilating air
on a commutator spider I5 which has axial pas
which ?ows through the motor, and the outlets
sages !6 extending therethrough. The passages
for this air provide openings through which wa
I6 communicate with an annular space I‘! in the
ter may sometimes splash into the interior of
end
plate I8 at the commutator end of the arma
the motor, as during a heavy rain. The present
ture II. The annular space H encloses the ends
invention provides a construction in which the
of the axial passages I2, so that air ?owing
air outlets are located in air chambers adjacent
through the passages I6 into the space I1 enters
one end of the motor, which have means for pre
venting the entrance of splashing water into the 30 the passages I2 and ?ows through them to cool
the armature. Axial passages I 9 are also pro
motor, and which are arranged so that the open
vided at the opposite end of the armature to
ings are disposed in vertical planes parallel to
permit the escape of the air ?owing through the
the direction of movement of the motor, so that
passages I2.
danger of water splashing into the openings is
The frame I, as previously mentioned, is gen
minimized.
Other objects and advantages of the invention 35 erally octagonal in cross-section in its central
portion. At the commutator end of the frame an
will be apparent from the following detailed de
air inlet 20 is provided at one side of the lon
scription, taken in connection with the accom
panying drawings, in which:
Figure l is a longitudinal sectional view of a
motor embodying the invention,
gitudinal central plane of the motor, through
which air is forced into the motor for cooling
40 purposes. The air inlet 20 may have a ?ange
2| to adapt it for connection to an air duct. The
opposite, or pinion end of the frame I is made
square in cross-section, as clearly seen in Figs.
Fig. 2 is a transverse sectional view, approxi
mately on the line II-II of Fig. 3,
Fig. 3 is a top plan view of the motor,
2 and 4, so that the corners of the square end
Fig. 4 is an end elevation of the motor frame, 45 portion of the frame project radially beyond the
partly in section on the line IV—IV of Fig. 3,
adjacent surfaces of the octagonal central por
and
tion. These extending corners form air cham
Fig. 5 is a fragmentary sectional view on the
bers 22 through which the ventilating air is dis
line V—V of Fig. 4.
charged from the machine, and each of the air
The motor shown in the drawings for the pur
chambers 22 has an opening 23 in each of its
pose of illustration is a high-voltage, direct-cur
side walls, so that there is a total of eight dis
rent traction motor for electric railway use, but
charge openings through which the escaping air
it will be understood that the invention may be
may flow.
applied equally well to other types of motors.
In order to prevent water which may splash
The motor shown in the drawings has an enclos 55 through the openings 23 from entering the inte
2,404,979
a
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rior of the motor, each of the air chambers 22
has a ba?ie wall 21% adjacent its openings 23 and
extending past the openings in such a manner
that any water which may enter through the
openings 23 will strike the baiile wall 24 and
be de?ected towards the bottom of the chamber
22. As clearly shown in Fig. 4, the openings 23
extend to the bottom surfaces of the chambers 22
4
understood, therefore, that the invention is not
limited to the exact details of construction shown
described but, in its broadest aspects, it in
cludes all equivalent embodiments and modi?ca
tions which come within the scope of the ap
pended claims.
W e claim as our invention:
1. A dynamo-electric machine having a rotor
member and a stator member, said stator mem
so that any water which strikes the baffles 24
ber including a frame structure, the frame struc~
10
and is de?ected down to the bottom of the cham—
ture being generally octagonal in cross-section,
her will drain out through the openings 23.
but having an end portion which is generally
The frame i has axle bearing seats 25 and
square in cross-section, whereby the corners of
suspension lugs 2&3 for mounting it in position on
end portion form chambers extending radial
the truck of a railway locomotive- or car. The
1:; beyond the adjacent surfaces of the ctagonal
motor is intended to be suspended on the truck; 15 portion of the frame structure, said chambers
by the lugs 25 and supported on an axle by means
having openings in their side walls to permit the
of the bearing seats 25, with the shaft extending
escape of ventilating air, and means in said
transversely of the truck and geared to the axle.
chambers for preventing the entrance of liquid
It will :be apparent that in this position the open~
into the interior of the machine through the
ings 23 are located in vertical planes which are 20
parallel to
direction of motion of the motor.
This position of the openings minimizes the dan
ger of any great amount of Water splashing into
chambers.
2. A dynamo-electric machine having a rotor
member and a stator member, said stator mem
them, even during a heavy rain, since water
two being generally octagonal in cross-section,
but having an end portion which is generally
splashing on the ground adjacent the motor while
it is moving would tend to strike either the front
ber including a frame structure, the frame struc—
square in cross-section, whereby the corners of
said end portion form chambers extending ra
The motor is ventilated by air entering through
dially beyond the adjacent surfaces of the octag
the air inlet 20, which is preferably connected to
a duct through which air is forced by a blower 30 onal portion of the frame structure, said cham
bers having openings in their side walls to permit
on the locomotive to provide forced ventilation
the escape of ventilating air, and baiiie walls in
for the motor. The air entering through the inlet
said chambers disposed adjacent the openings
Zil passes through the motor as shown by the
to catch liquid entering the chambers through
arrows in Figs. 1 and 5, some of the air ?owing
said openings.
directly over the poles 2 and ii, and ?eld wind
3. A dynamo~electric machine having a rotor
ings 3 and 5, while some of it passes over the
member
and a stator member, said stator member
commutator to cool the commutator and the
including a frame structure and end brackets
brushes and brush rigging, which are mounted
closing the ends of the frame structure, air inlet
on the frame adjacent the commutator. This
means
adjacent one end of the frame structure,
air then flows through. the passages in the com
said frame structure having a central portion
mutator spider and end plate Hi into the axial
and having an integral end. portion at the oppo
passages 52 through the armature, from which
site end from said air inlet means, said end por
it is discharged through the passages 59. Thus,
tion being generally square in cross-section,
the air flows through the motor by diiferent
whereby the corners of the square end portion
or rear of the motor.
paths from the commutator end to the opposite,
or pinion, end where the air chambers 22 are
located, and all the air flows into these cham
bers and escapes from the motor through the
form chambers extending radially beyond the
adjacent surfaces of the central portion of the
frame structure, said chambers having openings
in their side walls for the escape of ventilating
openings
The provision of two relatively
and baffle walls in said chambers for pre
large openings in each of the air chambers 2.2 50 air,
venting
the entrance of liquid into the machine.
permits the air to escape without any restriction
4. A dynamo-electric machine having a rotor
on its flow due to the discharge openings, while
member and a stator member, said stator mem
the baffles are arranged so that they do not ma
:ber
including a frame structure and end brackets
terially obstruct the ?ow of air. Thus the effec
closing the ends of the frame structure, air inlet
tiveness of the ventilation of the machine is not
' means adjacent one end of the frame structure,
adversely affected. by the splashproof construc
said frame structure having a central portion
and having an integral end portion at the oppo
splashproof constructions have usually seriously
site end from said air inlet means, said end por
restricted or obstructed the flow of air, with re
tion being generally square in cross-section,
60
sultant impairment of the ventilation.
whereby the corners of the square end portion
It should now be apparent that a splashproof
form chambers extending radially beyond the
construction especially adapted for electric rail
adjacent surfaces of the central portion of the
way motors has been provided which effectively
frame structure, said chambers having openings
prevents the entrance of splashing water or other
therein
in planes transverse to the axis of the
foreign substances into the interior of the motor,
machine for the escape of ventilating air, and
but which does not materially impair the effec
baffle walls in said chambers for preventing the
tiveness of ventilation. It will be apparent that
entrance of liquid into the machine.
the invention can be applied to motors differing
in their detailed construction from that shown,
ERICH O. MUELLER.
and that various modi?cations might be made
RICHARD H. WAGNER.’
within the scope of the invention. It is to be
tion. This is an important advantage, since prior
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