Improvements in Continuous Current Electric Motors or Generators of Enclosed Type.
Year: 1899

page_text: Date of Application, 14th Sept., 1899
Complete Specification Left, 13th June, 1900-Accepted, 1st Sept., 1900
PROVISIONAL SPECIFICATION.
Improvements in Continuous Current Electric Motors or Generators of
Enclosed Type.
HERBERT WILLIAM WILSON, 5, Elm Terrace, St. Austell, Cornwall, Electrical
Engineer, do hereby declare the nature of this invention to be as follows: -
My invention has reference more especially to continuous current electric
motors of enclosed type, as employed for general industrial purposes. And has
for its object to provide a distinct form of design, although embodying general
principles of construction in previous usuage.
My machine is of the two pole type, having two field magnet cores, forming
together with the body or magnet yoke casting, a double magnetic circuit.
The body on magnet yoke of my machine, as is usual with the type, encloses
the armature, field coils, commutator and brush gear of the machine. The
main portion thereof having approximately the form of a square box with curved
sides and rounded corners, and partially flat ends. From one of the said ends
projects a large cylindrical shaped projecting part, which encloses the commutator
and brush gear of the machine, and which is provided with large holes for
affording access to the commutator and brush gear. The said holes being
covered over with a suitable detachable cover.
Two of the curved sides of the main portion of the said body or magnet yoke
casting are provided with large holes of sufficient size to permit of the field
magnetizing coils when attached to the field magnet cores to pass through.
The said holes being provided with facings on the outside of the body casting
for the attachment of the field magnet cores. The field magnet cores being
provided with large flanges for such a purpose. The said field magnet cores I
provide with large hollow centres extending almost to the pole face, the said
hollow centres being open to the atmosphere at the end where attached to the
yoke casting. I also provide the said field magnet cores when desirable with
slots or their equivelent through the pole, from the face to the hollow centre
provided in the said cores, for the purpose of assisting the ventilation of the
interior of my machine.
The bearing ends of the body of my machine are provided with circular holes
of about the same diameter as the bore of the pole faces and concentric therewith,
which holes serve the purpose of providing a means of placing the armature
in position or withdrawing the same, and also for centring the bearings. The
bearings being provided with suitable flanges for such a purpose.
In order that the form and general construction of my machine may be
clearly understood I will now proceed to describe the same with reference to the
accompanying drawings.
Fig. 1 represents an external end elevation of my machine shewing clearly
the outline of the main portion of the body or yoke casting as viewed from an
end direction
Fig. 2 represents an external longitudinal elevation of my machine, presenting
an end view of one of its field magnet cores.

page_text: Fig. 3 represents a cross section of my machine through the centre of the
armature and field magnet cores, shewing the general construction of field magnet
cores and method of attachment to the yoke or body, and also shewing slots a, a
provided through the pole pieces to the hollow centres of the field cores.
The drawings shew my machine with the body or magnet yoke casting made
in one part, but I claim the option when desirable to construct the said body
or yoke in two parts, for the purpose of affording an additional means of with-
drawing the armature.
Improvements in Continuous Current Electric Motors or Generators of
Enclosed Type.
HERBERT WILLIAM WILSON, The Grange, Wendling, East Dereham, Norfolk,
late of 5, Elm Terrace, St Austell, Cornwall, Electrical Engineer, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:-
My invention has reference more especially to direct current electric motors
of enclosed type, as employed for general industrial purposes, but may be con-
veniently employed for direct current electric generators.
The object of my invention is to provide a design which may be distinct from
other designs in previous use, and at the same time provide a convenient method
of construction.
My machine is of the two pole type having two detachable hollow field magnet
cores, and I construct my machine in the following manner. I employ one
principal casting supported on suitable feet, which said casting has approximately
the form of a square hollow box, having curved or flat sides and well rounde:
corners, and a large hollow cylindrical projecting part at one end. This said
principal casting forms the magnet yoke of my machine and encloses the armature,
commutator, brush gear and field coils in a usual manner. I provide this said
casting on two of its opposite sides with large openings having external facings,
such openings being of sufficient size to permit the field magnetizing coils when
attached to the field cores to pass through into the said yoke casting. I also
provide the two ends of the said yoke casting with circular openings of about
the same diameter as the armature, which openings I bore out concentric with
the bore of the pole faces, which provide a means for withdrawing the armature
and centring the bearings.
The two detachable field magnet cores of my machine one end of each of which
constitutes a pole piece, I construct so that they may be easily detached
from the body or yoke casting. These I provide with large flanges at one end,
which are secured in a convenient manner to the facings provided on the yoke
casting. I also make the cores of hollow construction and preferably provide
a ventilating slot through the centre of the pole face extending through to the
said hollow centres, which allow air of external temperature to come in contact
with the armature and thus provide an effective means of ventilating the interior
of my machine.
The bearings two in number I construct with flanges preferably provided with
ventilating openings, and which I centre into the circular openings provided at
the ends of the body or yoke casting. I also provide a large opening or openings

page_text: through the hollow cylindrical projecting portion of my body or yoke casting
for the purpose of providing a means of inspecting and adjusting the brush gear,
which opening or openings I may cover by detachable covers when desirable.
In order that the design and general construction of my machine may be
clearly understood I will now proceed to describe the same with reference to the
accompanying drawings.
Fig. 1 represents an external end elevation of my machine.
Fig. 2 represents an external longitudinal elevation, presenting an end view
of one of the hollow field magnet cores provided with a ventilating slot (a)
through the pole piece.
Fig. 3 represents a cross section, showing the hollow construction of field
magnet cores and method of attachment to the body or yoke casting, and also
shewing ventilating slots, provided through the pole pieces.
Similar parts are denoted by the same reference numerals in all views.
Referring now to Figures 1 and 3, 6 is the principal body or magnet yoke
casting, provided at two of its opposite sides with large openings c and c having
external facings d and d to which are attached the two hollow field magnet
cores e and by means of flanges e¹ and e' provided on and forming part of the
said cores. The said openings c and c being of sufficient size to allow of the
said cores e and e together with their respective field coils f and f to pass
through into the position shown within the said body or magnet yoke casting.
One end (el and o") of each of the said cores constituting the pole pieces of
pole faces, which may be provided with ventilating slots a and as described.
Referring to Figure 2 and again to Figure 1, the hollow cylindrical projecting
portion of the body or magnet yoke casting is provided with an opening or
openings g as shown in dotted lines, and which may be fitted over with detachable
covers h and h, secured by means of screws, hinges, or the like. The two bear-
ings i and i are provided with circular flanges and which are partly recessed
into circular openings provided at and through each end of the body or yoke
casting as afore described, the said bearings, being secured to the body or yoke
casting by means of screws or the like as shown.
The armature is of the usual type.
Having now particularly described and ascertained the nature of my said in-
vention, and in what manner the same is to be performed, I declare that what I
claim is:-
1. A two pole direct current electric motor or generator having substantially
the form, and constructed in a manner substantially as described with reference
to the accompanying drawings.
2. A two pole direct current electric motor or generator of enclosed type
having detachable hollow field magnet cores substantially as described with
reference to the accompanying drawings.
3. A direct current electric motor or generator of enclosed type having hollow
field magnet cores provided with ventilating slots through the pole pieces sub-
stantially as described with reference to the accompanying drawings.
Dated this 11th day of June 1900.
HERBERT WILLIAM WILSON.