Improvements in Continuous Current Electric Motors or Generators of Iron-clad or Enclosed Type.
Year: 1898

page_text: Date of Application, 24th Aug., 1890
Complete Specification Left, 23rd May, 1899-Accepted, 22nd July, 1899
Date of Application, 24th Aug., 1890
Complete Specification Left, 23rd May, 1899-Accepted, 22nd July, 1899
PROVISIONAL SPECIFICATION.
Improvements in Continuous Current Electric Motors or Generators
of Iron-clad or Enclosed Type.
HERBERT WILLIAM WILSON, The Grange, Wendling, East Dereham, Norfolk,
Electrical Engineer, do hereby declare the nature of this invention to be as
follows:-
An iron-clad or enclosed type motor or generator having two pole pieces
and one magnet core with one field magnetizing coil. The yoke constituting
a box design but in vertical cross section (that is a cross section at right angles
with the armature spindle) of cylinderical or ring form, and forming with its
core a double magnetic circuit and so designed as to completely enclose or
otherwise protect the armature, field coil, commutator, and other parts, and
having projections of cylinderical form for supporting the two bearings, such
projections being bored concentrically with the bore of the pole pieces for
means of supporting and centreing such bearings. On such bearings I have
cast circular discs or other suitable provision for this purpose, the same being
secured in position by screws or the like. The centre line of the armature is
placed eccentrically to that of the yoke ring to allow of sufficient space radially,
in one direction for the magnet core and field coil. The yoke casting is made
in two parts and jointed approximately at the centre line of the armature
spindle, the two parts being held in position by means of screws or the like,
the lesser part forming a removable cover. The magnet core is preferably
circular in section having a removable pole piece.
Part of the two half magnetic circuits of the cylinderical yoke by suitable
formation forming the other pole piece.
Through the centre of the yoke pole piece and extending through the pole
piece to the outside in a longitudinal direction for about the length of the
armature I have a ventilating slot provided, also through lengthwise of the
magnet core and that portion of the yoke in connection therewith I have a
ventilating hole extending from the bore of its pole piece to the outside of the
yoke casting, these forming together an efficient means for securing ventila-
tion. Light removable covers hinged or otherwise are provided over that part
of the frame or yoke casting occupied by the commutator.
In outside end elevation the motor or generator presents a box casting of
circular outline with its bearings placed eccentrically thereto and having pro-
jecting arms of cylinderical form for supporting such bearings, such arms or
projections at one end having suitable openings for inspection of commutator,
such openings being covered by removable covers. The body of the yoke
casting being provided with suitable feet projections.

page_text: Improvements in Continuous Current Electric Motors or Generators
of Iron-clad or Enclosed Type.
HERBERT WILLIAM WILSON, The Grange, Wendling, East Dereham, Norfolk,
Electrical Engineer, 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 ;-
1,,
My invention relates to the general construction, and ventilation of a two
pole iron-clad, or enclosed type electrical motor or generator, and has for its
object to provide a convenient method of construction whilst at the same time
to improve the external appearance of electrical machines of this class, and to
provide a ready and easy means of dismemberment.
According to my invention the main body casting forms as is usual with this
class of machine the magnetic yoke, and is formed in such a manner as to
enclose the armature core, field core, and field magnetizing coil, and has
the form of a cylindrical shaped box, made in two parts. The one part being
provided with supporting feet and the other part forming a lid or cover.
From the flat ends of the main body or yoke casting project large hollow
cylindrical shaped projecting parts, which support the bearings and at the same
time enclose or otherwise protect the commutator or commutators, brush gear,
and terminals of the machine. These projecting parts are bored at their
extremities concentrically with the bore of the pole faces, and are bored of
sufficiently large diameter so as to permit of the armature being withdrawn
when either of the two bearings are removed, and are provided with large
openings for the purpose of enabling ready access to the brush gear and
terminals, such openings being covered by removable covers.
The bearings two in number are provided with circular flanges suitably
shaped so as to be self centring with the bore of the projecting supports, and
the bore of the pole faces, and are provided with openings through the flanges for
the purpose of assisting the ventilation of the interior of the machine. The
bearings being held in position by means of screws or the like.
An end elevation in section through the centre of the armature presents the
body or yoke casting of my machine in the form of a ring with the armature
situated eccentrically therein. The yoke-ring" being of sufficiently large
diameter so as to permit of the magnet core and field coil being situated
radially in one direction therein. The yoke-ring or body casting forming
together with the magnet core a double magnetic circuit. The portion of of
the yoke-ring or body casting which comes in near proximity to the armature is
suitably formed to constitute one pole. The other pole being formed by the
free end of the magnet core.
The magnet core I make of wrought iron or magnet steel, preferably of
round section, and fitted with a removable pole piece or having the pole piece
made in one with the core and the other end of the core fitted into the body
or yoke casting in such a manner as to be easily detached therefrom, being
held in position by means of set-screws or the like.
Through the centre of the yoke pole formation form the bore of its face to
the outside of the casting and extending in a direction lengthwise with the
armature, and for about the length of the armature. I provide a slot or its
equivalent for the purpose of assisting the ventilation of the interior of the
machine. Also through the centre of the magnet core, and extending from
the bore of its pole face to the outside, I provide a hole or slot or its equivalent

page_text: also for the purpose of assisting ventilation such ventilating slots or holes
being sheilded on the outside where desireable by suitable protecting covers.
In order that my invention 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. The main portion of the body
casting (a) being provided with supporting feet, and the uppor portion (6)
forming a removable lid or cover. (d) represents one of the two circular
flanged bearings provided with openings through the flange. (c and c¹) repre-
sent removable covers fitted over the openings of the portion of the machine
occupied by the commutator and terminals.
Figure 2 represents an external longitudinal elevation of a one commutator
machine showing more clearly the position of covers c and c. The openings
provided for access to brush gear and terminals being indicated by dotted lines.
Figure 3 represents an end sectional elevation through the armature, show-
ing the general construction, and formation of yoke-ring or main body casting,
and the relative positions occupied by the armature (g) and the magnet core (h).
Also shewing method and position of ventilating slots or holes f and fi and
protecting cover (e).
Fig. 4 represents an end sectional elevation of my machine, with its arma-
ture and magnet core inverted, and shewing the magnet core with its pole piece
constructed in one piece, the same being held in position in the uppor or lid
portion of the main body casting (6) so as to be easily removed therefrom.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is:-
(1) An electrical machine of the nature herein set forth, constructed in such
a manner so as to have the form, and external appearance substantially as
described with reference to the accompanying drawings.
(2) An electrical machine of the nature herein set forth, having a combi-
nation of structural details substantially as described with reference to the
accompanying drawings.
་
(3) An electrical machine of the nature herein set forth having ventilating
slots or their equivalent provided at the pole faces, and extending to the out-
side of the machine, substantially as described with reference to the accom-
panying drawings.
Dated this 901 das S1000