IMPROVEMENTS IN DYNAMO MACHINES AND ELECTRO MOTORS
Year: 1885

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We CHARLES ALFRED ADOLF CAPITO and MADS PETER HARDT both of
23 Queen Anns Gate in the City of Westminster Electrical Engineers do hereby
declare the nature of said invention for "IMPROVEMENTS IN DYNAMO MACHINES
AND ELECTRO MOTORS" to be as follows:-
According to this invention we construct the armature of a number of soft iron
grid discs with intervening soft iron washers, the whole being mounted on a shaft
which by preference is made square to ensure accurate correspondence of the
circumferential parts of the grid discs. These latter are formed with a number of
narrow or light radial spokes or arms proceeding from the central boss or nave and
terminating in a narrow ring which on its outer circumference is provided with a
number of short radially projecting bars the sides of which however are so formed
as to produce parallel spaces in which the wire is to be coiled. The number of these
outer bars may be the same as or half of the inner radial spokes. The discs and
washers are all held together by a nut on a screwed part at one end of the shaft
and a shoulder at the other end of the shaft. The bearings of the shaft are in cross
shaped end brackets which are united to each other by non-magnetic tie bolts or
bars which again are fixed on the end pole pieces of the motor. The pole pieces are
at each side of the motor fixedly connected to brackets or feet by which the motor
is bolted to the foundation or floor. The commutator may be arranged inside of
one of the end brackets.
,
When the aforesaid armature is applied to a dynamo machine we prefer to
arrange the field magnets so as to partly enclose the armature that is to say by a
part circular piece on each side, which pieces are suitably formed for winding the
wire thereon. The outer sides of the field magnets are united by a number of
transverse tie bars.

page_text: I G.
Improvements in Dynamo Machines and Electro Motors.
We CHARLES ALFRED ADOLF CAPITO and MADS PETER HARDT, both of
23, Queen Ann's Gate in the City of Westminster, 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:-
Figure 1 of the accompanying drawings is an end view and Figure 2 a part
sectional plan of a motor constructed according to this our invention, Figure 8 is
an end view of part of the armaturé. According to this invention we construct
the armature of a number of soft iron grid discs A shown separately in Figure 3,
with intervening soft iron washers A', the whole being mounted on a shaft B
which by preference is made square at this place as shown in Figure 2 to ensure
accurate correspondence of the circumferential parts of the grid discs A. These
latter are formed with a number of narrow or light radii spokes or arms a
proceeding from the central boss or nave a¹ and terminating in a narrow ring a²
which on its outer circumference is provided with a number of short radially
projecting bars a³ the sides of which however are so formed as to produce parallel
spaces in which the wire is to coiled endwise as shown in dotted lines at I Figure 2.
The number of these outer bars a³ may, as here shown, be the same as (or it might
be half) that of the inner radial spokes a. The lines of force pass along by the
radial bars a. The discs A and washers A¹ are all held together by a nut and
check nut C. C. on a screwed part at one end of the square part of the shaft B and
& shoulder B¹ at the other end of this part of the shaft. The bearings of the shaft
are in cross shaped end brackets E which are fixed on the end pole pieces F by
means of screws E' or other suitable means. The pole pieces F are at each side of
the motor fixedly connected to brackets or feet G by which the motor is bolted to
the foundation or floor. The commutators H.may be arranged inside of one of the
end brackets.
The aforesaid armature can also be applied to a dynamo machine. The outer
sides of the field magnets are united by a number of transverse tie bars. It will
be observed that the washers A' as well as the grid discs A are made of
paramagnetic metal.. Further by reason of the rather broad spokes a of the grid
discs A and the rather narrow rim a² and by reason of the relatively large mass of
metal collected around the axis we get the lines of force to pass along the spokes a
or in a direction vertical to the coiling of the armature and these lines of force are
hence cut at right angles by the coiling in the rotating. We thus obtain a greater
efficiency, as proved by experiments.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed we declare that what
we claim is
First. The improved form of soft iron grid discs A substantially as described and
shown

page_text: Second. In an electric motor or dynamo machine the armature consisting of soft
iron grid discs A and intermediate soft iron washers A¹ held together on a square
central shaft and wound longitudinally with insulated wire substantially as
described and shown.
Third. The combination of parts forming the improved machine as shown on the
accompanying drawings.