IMPROVEMENTS RELATING TO THE ARMA- TURES OF DYNAMO ELECTRIC MACHINES & ELECTRO MOTORS
Year: 1886

page_text: Machines and Electro Motors.
I JOSEF WODICKA of 539 Caledonian Road, London, N. Electrician, do hereby
declare the nature of my invention for "IMPROVEMENTS RELATING TO THE ARMA-
TURES OF DYNAMO ELECTRIC MACHINES & ELECTRO MOTORS" and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement:-
My Invention relates to improvements in the construction of armatures of the
ring type, for dynamo electric machines and electro motors.
Hitherto in ring armatures, the connections have been made in the well known
Paccinotti "style. In accordance with my Invention, I adopt a different method
of connecting the ends of the coils to the segments of the commutator, as will be
seen on reference to the accompanying 2 sheets of drawings.
Figures 1 and 2 Sheet 1; and Figure 3 Sheet 2, represent armatures constructed
to revolve in a magnetic field of two poles; and Figure 4 Sheet 2, an armature
designed to revolve in a magnetic field of four poles.
In Figure 1, the armature is illustrated as being wound with sixteen different
coils, the dotted lines representing the first eight coils, and the full lines, the
second eight coils, which are wound over the first eight coils. The interior ends
of the diametrically opposite coils are connected together, leaving in an armature
made up of sixteen coils, sixteen free ends, said free ends, being connected to a
commutator divided into eight segmental parts, thus:-The free end of No. 1 Coil
see Figure 1, Sheet 1, is connected to No. 1 segment No. 1°, to No. 2 segment.
The end of coil 2 to No. 2 segment; 2° to No. 3 segment; the same system being
followed, until all the free ends of the coils are connected to the several segments
of the commutator.
Figure 2, Sheet 1 and Figure 3, Sheet 2, represent a modification of the fore-
going according to which instead of the sixteen coils being wound in two layers,
each layer comprising eight coils, I here dispose the coils, side by side singly; the
interior ends of opposite coils being connected in the same manner as shown in
Figure 1, the exterior end of coil 1, is connected to No. 1 segment; No. 1ª to No. 2
segment; coil 2, to No. 2 segment; coil 2ª to No. 3 segment, and so on, until all
the free ends of the coils are connected to the commutator.

page_text: Figure 4, Sheet 2, represents the system I adopt, according to my Invention,
of connecting the wires of an armature consisting of twenty coils, moving in
a magnetic field of four poles, and is in principle, the same as illustrated in
Figures 1, 2 and 3.
This system of connecting the wires of the coils may be applied to armatures,
moving in a magnetic field of more than four poles, and the method, which I adopt,
of connecting the exterior wires of the coils to the commutator, may, with equal
advantage, be applied to armatures of the cylindrical or flat ring types.
For cylindrical armatures, which, this, mode of connecting the wires will be
found of especial advantage, as the interior ends, instead of having to pass through
a ring, where they cannot cut the lines of magnetic force, may be carried to the
back, and be there connected in parallel, thus considerably reducing the resistance,
at the same time adding greatly to the efficiency of the machine.
I do not limit myself to sixteen, or any given number of coils, as it will be self
evident that any convenient number of coils may be used with equal advantage.
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,
Firstly. In a ring armature, the system of connecting together the interior ends
of opposite coils, substantially as herein described and illustrated in the accom-
panying two sheets of drawings.
Secondly. In a ring armature, the method which I adopt, for connecting the
exterior free ends of the coils to a commutator composed of half the number of
segments that there are coils, substantially as herein described and illustrated in
the accompanying drawings.
JAMES
STEVENSON,
Gray's Inn Chambers,
20, High Holborn, London, W.C.,
Agent for Applicant.