Improvements in or relating to Armatures for Electric Generators or Motors.
Year: 1889

page_text: Date of Application, 24th Dec., 1889
Complete Specification Left, 24th Sept., 1890-Accepted, 1st Nov., 1890
PROVISIONAL SPECIFICATION.
Improvements in or relating to Armatures for Electric Generators
or Motors.
A communication from abroad by THE WESTINGHOUSE ELECTRIC COMPANY, of
Pittsburgh, in the County of Allegheny, State of Pennsylvania, United States
of America.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., MI.M.E., of the Agency for Foreign
Patent Solicitors, 6 Lord Street, Liverpool, and G Bank Street, Manchester, both in
the County of Lancaster, and 323 High Holborn in the County of Middlesex, Civil
Engineer do hereby declare the nature of this invention to be as follows:-
The invention relates to the construction of armatures for electric generators and
motors, and the object is to providean electrically efficient armature, the construction
of which is simple and economical and in which the coils of insulated conducting
wire or ribbon may be conveniently wound or forced into bobbins, so located with
reference to the body of the armature as to afford as good results as possible.
For certain purposes, it is desirable to construct the armatures of electric generators
and motors with their cores of magnetizable material projecting through the coils into
close proximity to the field-magnet poles. When armatures are constructed in this
manner, some means are necessary for holding the coils in position and preventing
them from being thrown out by centrifugal force. This invention aims to provide
such means in an armature having polar projections, and also to form an armature in
such a manner as to expose a large area of core surface to the field-magnet poles.
The invention consists, in general terms, in forming an armature core, which is pre-
ferably built up of lamince of magnetizable material insulated from each other, with
diverging slots or openings for receiving the armature wire or ribbon, which slots are
connected with the exterior of the armature by openings through which the wire may
be laid in the slots, and in placing the wire in such slots in the proper manner.
Claim is not here made to the constructions shown in United States Patents
No. 327,797, granted to Immisch, and No. 292,077, granted to Wenstrom, and the
British Patent of Coerper, No. 9013 of 1887.
The invention will be described more particularly in connection with the accom-
panying drawings, in which
Figure 1 is an end view, partly in section, of an armature embodying the features
of the invention, and
Figure 2 is a plan of the armature.
Referring to the figures, F F indicate field-magnet poles, and A represents the
body or core of an armature composed, in this instance, of lamina of magnetizable
material built up in any suitable manner, the lamine being preferably separated by
intervening strata of insulating material. The individual plates or laminæ are
constructed with radial openings c, extending a short distance from the surface and
with slots or openings b which extend in the opposite direction from the openings, c.
The slots diverge from each other at such angles as to cause the two slots upon the
opposite sides of each web e, thus formed, to lie in the same chord of the circle of the
armature.
The plates may also be stamped or formed with openings G to remove the unnecessary
metal. After the plates are formed, they are laid up in the proper manner to form
the entire armature core, the slots b being placed opposite each other to form
continuous openings through the entire length of the armature. These openings may
be lined by pockets h of insulating material, such for instance as vulcanized fibre, and
the wires are then wound into the slots from the openings c and around the respective
webs c. Winding clips may be placed at the respective ends of the armature

page_text: opposite each web e to hold the wires in the proper positions as they are wound in the
slots and down upon the armature ends.
The wires having been wound into their proper positions, they may be held more
securely in position by means of blocks K of non-magnetic material placed at
intervals or extending through the entire slots or openings e and projecting into the
slots b.
An armature constructed in the manner described is found to be very efficient in its
operations, and, at the same time, simple in its construction.
The connections between the armature coils and the conductors or collecting plates
may be made in any usual well known manner according to the purposes desired to
be served.
DATCH THIS rd day of December 10.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.
Improvements in or relating to Armatures for Electric Generators
or Motors.
A communication from abroad by THE WESTINGHOUSE ELECTRIC COMPANY, of
Pittsburgh, in the County of Allegheny, State of Pennsylvania, United States
of America.
I, WILLIAM PHILLIPS THOMPSON, F.C.S. M.I.M.E. of the Agency for Foreign
Patent Solicitors 6, Lord Street, Liverpool, and 6, Bank Street, Manchester both in
the County of Lancaster, and 323 High Holborn in the County of Middlesex, Civil
Engineer do hereby declare the nature of this invention and in what manner the
sanie is to be performed, to be particularly described and ascertained in and by the
following statement:-
The invention relates to the construction of armatures for electric generators and
motors, and the object is to provide an electrically efficient armature, the construction
of which is simple and economical and in which the coils of insulated conducting wire
or ribbon may be conveniently wound or forced into bobbins, so located with reference
to the body of the armature as to afford as good results as possible.
For certain purposes, it is desirable to construct the armatures of electric generators
and motors with their cores of magnetizable material projecting through the coils into
close proximity to the field-magnet poles. When armatures are constructed in this
manner, some means are necessary for holding the coils in position and preventing
them from being thrown out by centrifugal force. This invention aims to provide
such means in an armature having polar projections, and also to form an armature in
such a manner as to expose a large area of core surface to the field-magnet poles.
The invention consists, in general terms, in forming an armature-core, which is
preferably built up of lamina of magnetizable material insulated from each other,
with diverging slots or openings for receiving the armature wire or ribbon, which
slots are connected with the exterior of the armature by openings through which the
wire may be laid in the slots, and in placing the wire in such slots in the proper
manner.
Claim is not here made to the constructions shown in United States Patents
No. 327.797. granted to Immisch, and No. 292,079, granted to Wenstrom, and the
British Patent of Coerper No. 9013 of 1887.
The invention will be described more particularly in connection with the drawings
accompanying the Provisional Specification, in which
Figure 1 is an end view, partly in section, of an armature embodying the features
of the invention, and
Figure 2 is a plan of the armature.
Referring to the figures, FF indicate field-magnet poles, and A represents the
body, or core of an armature composed, in this instance, of laminæ of magnetizable

page_text: material built up in any suitable manner, the lamina being preferably separated by
intervening strata of insulating material. The individual plates or lamina are con-
structed with radial openings c, extending a short distance from the surface and with
slots or openings which extend in the opposite direction from the openings c. The
slots diverge from each other at such angles as to cause the two slots upon the
opposite sides of each web e thus formed to lie in the same chord of the circle of
the armature.
The plates may also be stamped or formed with openings G to remove the
unnecessary metal. After the plates are formed, they are laid up in the proper
manner to form the entire armature core, the slots being placed opposite each other
to form continuous openings through the entire length of the armature. These
openings may be lined by pockets of insulating material, such for instance as
vulcanized fibre, and the wires are then wound into the slots from the openings e aud
around the respective webs e. Winding clips may be placed at the respective ends
of the armature opposite each web e to hold the wires in the proper positions, as they
are wound in the slots and down upon the armature ends.
The wires having been wound into their proper positions, they may be held more
securely in position by means of blocks K of non-magnetic material placed at
intervals or extending through the entire slots or openings and projecting into the
slots b.
An armature constructed in the manner described is found to be very efficient in
its operations, and, at the same time, simple in its construction.
The connections between the armature coils and the conductors or collecting plates
may be made in any usual well known manner according to the purposes desired to
be served.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me by my
foreign correspondents, I declare that what I claim is :-
1. The improvement in armatures for electric generators or motors which consists
in forming the core of a magnetizable drum having a series of longitudinal slots opening
out to the surface and at a considerable angle with the radius, in which slots the wire
is wound substantially as described.
2. In combination with a core as set forth in claim 1, or as illustrated, the blocks
of non-magnetizable material K filling up the entrance to the slots, thereby forming a
continuous surface and holding the same in place.
3. An armature having a core substantially as set forth in claim 1 with insulated
linings to the slots, the armature wire wound in said slots and winging blocks or clips
holding the wires in place.
Dated this 23rd day of September 1890.
WM. P. THOMPSON & Co.,
Agents for the Applicant.