Improvements relating to Enclosed Motors or Dynamos.
Year: 1898

page_text: Improvements relating to Enclosed Motors or Dynamos.
We, PERCY ROSLING and HARRY WALTON APPLEBY, of Trafalgar Works,
Trafalgar Street, in the City of Bradford, Electrical Engineers, do hereby declare
the nature of this invention to be as follows:-
This invention has for its object the arrangement of certain apparatus and com-
bining the same with enclosed electric motors or dynamos in a manner so that,
the said motors or dynamos are kept cooler when running than is the case when
arranged in the manner as hitherto.
In carrying out our object, we mount on the motor or dynamo armature shaft,
between the armature and case enclosing the motor or dynamo, the vanes of a
fan, by which, when in operation, air is drawn into the enclosed casing from the
outside atmosphere through a suitable opening, which may be provided with a
filter of cotton wool or other suitable material, applied in a manner so as to extract
from the air drawn in by the fan, any moisture, grit or other impurity floating
in the air that might be detrimental to the commutator, journals or other working
parts of the motor; the air drawn into the casing escaping therefrom through an
opening or openings suitably arranged.
Τ
1
T
1000
Improvements relating to Enclosed Motors or Dynamos,
We, PERCY ROSLING, and HARRY WALTON APPLEBY, of Trafalgar Works,
Trafalgar Street, in the City of Bradford, Electrical Engineers, do hereby declare
the nature of this invention and in what manner the same is to be performed, to
be particularly described and ascertained in and by the following statement:-
This invention has for its object, the arrangement of certain apparatus and
combining the same with what are known as enclosed motors or dynamos,"
that is to say, with motors or dynamos in which the metallic casing forms a part
of the magnetic circuit, the combination being so arranged that the enclosed
motors or dynamos are kept more thoroughly ventilated and cooler when running
than is the case when arranged in the manner as hitherto.
In describing our invention, reference is made to the accompanying sheet of
drawings, in which Fig. 1 represents an elevation of a metallic casing partly in

page_text: section of an enclosed motor or dynamo showing our improvement which is added
thereto and shown in section.
Fig. 2 is a plan of same,
Fig. 3 an end view of the metallic casing, and
Fig. 4 a detached sectional view showing a modified arrangement of inlet to
the interior of the metallic casing.
In carrying out our object, we place on the motor or dynamo shaft B, hetween
the armature and casing A, the vanes of a fan C, having openings on one side as
at D, so that as the fan rotates along with the said shaft, air is drawn into the
interior of the motor or dynamo casing through an opening such as at E, the air
so drawn in, after passing through the enclosure within the metallic casing A,
escapes therefrom through suitable openings formed at the opposite end or other
desirable part of the metallic casing A, thus by the said openings, ventilating
the enclosed motor or dynamo casing.
Instead of leaving the opening E, open direct to the atmosphere, it may be
protected by a sheet of gauze fixed to the exterior, thus covering the opening,
against which may be placed and supported in any suitable manner, a filter of
cotton wool, or other well known material, suitable for removing and thereby
preventing grit or other impurities floating in the air, being drawn by the fan C,
within the metallic casing and deposited on the enclosed motor or dynamo.
The opening E, into the metallic casing at the end near to the fan C, may be
connected by a pipe I, having an open end exposed to the atmosphere outside
the building in which the enclosed motor or dynamo is placed, or the said pipe
may terminate in a small chamber, and the dust particles floating in the air,
prevented getting to the enclosed motor or dynamo, by the fan C, drawing the air
through a suitable filter of known construction placed in a convenient position,
the air so drawn in escaping through suitable openings in the metallic casing
by which the interior is ventilated.
By passing a continuous current of cool air through the metallic casing A;
the motor or dynamo enclosed therein and forming a part thereof, is kept cooler
and therefore can be run to better advantage than is the case when the enclosed
motor or dynamo is arranged in the manner as hitherto.
Having now particularly described and ascertained the nature of our invention,
and in what manner the same is to be performed, we declare that what we
claim is:-
Enclosed motors or dynamos, within the metallic casing of which, is a rotary
fan arranged so as to draw a continuous current of air from the exterior and
pass the same through the casing, all being arranged substantially as and for
the purpose as hereinbefore described.
Dated this 5th day of October 1898.
JOHN WAUGH,
Agent Sunbridge Chambers, Bradford.