Year: 1888

page_text: Date of Application, 3rd Apr., 1888
Complete Specificati n Left, 22nd Dec., 1889
Complete Specification Accepted, 22nd Jan.. 1889
I. THOMAS PARKER of Commercial Road, Wolverhampton in the County of
Stafford, Electrical Engineer, do hereby declare the nature of this invention to be
as follows:-
Th's Invention relates to alternating current dynamo-electric machines and has
for its object to obtain increased efficiency and simplicity in construction and
operation.
In a dynamo constructed according to these Improvements the armature is fixed
and surrounds the field magnets which rotate.
The field magnets consist of a plain iron ring which has produced or secured
thereon a series of external radial projections or pole pieces. The parts of the ring
between the pole pieces are wound with coils of wire in such a manner that when the
coils are joined up in a closed electrical circuit, the pole pieces will be alternately N.
and S.
The fixed armature consists of two cast iron rings enclosing a ring built up of
laminated iron, the plates constituting the laminated ring being insulated from cach
other and from the enclosing cast iron rings.
Upon the inner surface of the fixed armature and transverse thereto, there are
secured a series of flattened coils concentric with the field magnets preferably wound
with insulated copper ribbon and preferably having wooden or vulcanite or similar
cores. These coils may be joined up with the external circuit in series, in parallel,
or in parallel series as may be desired.
D 1000
WILLIAM E. HEYS,
Agent for the Applicant.

page_text: Improvements in and relating to Alternating Current
Dynamo-electric Machines.
I, THOMAS PARKER of Commercial Road, Wolverhampton, in the County of
Stafford, Electrical Engineer, do hereby declare the nature of this invention, an in
what manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :-
This Invention relates to that type of alternating Current Dynamo-Electric
Machines in which the armature is fixed and surrounds the field magnets which
are rotated.
Such a machine is described in the Specification to Letters Patent
granted to myself and Paul Bedford Elwell No. 8710, dated 4th of August
A.D. 1882.
My present Invention is illustrated by the accompanying drawings in which similar
parts in the various figures are denoted by similar letters of referenco.
Fig. 1 represents a end view and Fig. 2 a side view both partly in section, of an
alternating current Machine constructed according to these Improvements. Fig. 3
represents a modification of Fig. 2, and Fig. 4 is a diagram of the coil winding and
connections. Figs. 5 and 6 show one of the armature coils in detail.
The rotating Field-Magnet A consists of an iron ring which has mounted formed or
secured thereon an even number of equi-distant radial projections or pole-piecos F F
around or between which the Field-Magnet coils B B are wound. As represented in
Fig. 2 the Field-Magnet coils surround the pole-pieces, in Fig. 3 they are wound
between the pole pieces. In either case the Field-Magnet coils are so wound and
arranged that alternate pole pieces will, when a current is transmitted through them
have opposite signs or characters, thus, N. S. N. S. N. S. This may be accomplished
by any of the known means or devices. Thus, assuming that all the coils are wound
alike and that successive coils are numbered 1, 2, 3, 4, 5, etc. Then, as indicated in
the diagram Fig. the coils may be connected in series in such a manner that the
current enters the inner layer of wire in the coils having even numbers; hence the
outer ends of the coils 1, 2-3, 1-5, 6--7, etc. will be connected together, and the
inner ends of the coils 2, 3-4, 5-6, 7-etc. will also be connected together.
A similar system of winding and connecting is employed for the Armature coils, as
will be hereinafter described.
The field-magnet ring is carried by spokes, by a disc or by like means upon a hub
through which passes the spindle G by means of which the Field-Magnets are rotated.
The fixed Armature is concentric with, and surrounds the Field-Magnets. It
consists essentially of two cast iron rings D1); a laminated iron ring or core C, and
the fixed armature coils E E. The plates D 1 have wings or flange by means of
which they may be bolted to the base plate. The sheets or plates constituting the
laminated core have individually the form of segments of a thin flat ring and are cut
from sheets of iron by known means. It may be possible however, in very small
machines to cut the sheets for the Armature core each in a single ring from a
sufficiently large sheet of iron. The plates constituting the laminated ring or core

page_text: of the Armature are insulated from each other and from the enclosing rings D D
by means of mica. varnished or paraffined paper or other usual or equivalent means.
The opening in the fixed Armature within which the Field-Magnets revolve has
such a diameter that when the Armature coils are fixed, the pole-pieces will rotate in
close proximity to the Armature coils.
The Armature coils are equal in number to the Field-Magnet ('oils, and they are
fixed upon the inner surface of the Armature as shown at EE, so that the series of
coils surround and are concentric with the Field-Magnets. It is preferred that
these coil should he wound with copper ribbon so as to get the maximum number
of turns in a given diameter, it is also advantageous to wind them on a wooden
core as represented in Figs. 5 and 6. Fig. 5 is a plan, and Fig. 6 is a section of one
of the Armature coils. H is the wood. insulate, or similar core upon which the coil
is wound.
In this core there are formed holes 1 through which the coil is secured to the
Armature by screws, bolts, spikes, or tho like means. Slots J J are also formed
through the core for the passage of tapes or ribbons by means of which the coil is
attached to the core. The winding of the coil is commenced at any convenient part
of the circumference of the core where a free end K of the copper ribbon is left
exposed for connection. One or more turns of the copper ribbon are then taken
around the core when, the tapes L L having been threaded through the slots J J,
they are respectively crossed over the layers of ribbon and one or more turns of
the ribbon are additionally laid on, when the tapes are again crossed. These
operations are repeated until the coil is wound to the desired size, when the ends
of the tapes may be tied or otherwise secured. The coil has its layers secured
to each other and to the core by the tapes and is curved, during or subsequent to
the winding, to the curvature of the interior of the Armature.
The free ends of the Armature coil Kand M, are in ordinary machines connected as
represented in the diagram Fig. 4 that is to say, the inner ends of the coils being
denoted by the lotter K, and the outer ends by the letter M, and the coils being
numbered consecutively, the connection of the series of the coils will be, M' to M²,
K to K, M to M, K to K etc. The terminals of the field magnet coils are two
insulated conducting rings on the central shaft against which bear brushes which
convey the current to the field magnet coils from an external source. The terminals
of the armature series are connected to binding screws whence the current generated
by the machine may be conveyed to the working circuit.
It will he obvious that the connections for special cases may be made in a different
manner. as for example, in parallel series for low e, m. f.
The other details and arrangements of the machine are the same as or similar
to those employed in ordinary machines of a similar type.
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 alternating current Machine having rotating Field-Magnets, a fixed
Armature surrounding the Field-Magnets, flat or flattened Armature coils, and a
laminated iron Armature core, all constructed and arranged substantially as herein-
before described.
(2) In an alternating current machine: an Armature composed of a laminated iron
ring having a series of flat coils arranged edge to edge on its inner circumference,
substantially as described.
D
101 1
1
בד
1000
WILLIAM E. HEYS,
Agent for the Applicant.