Improvements in Dynamo Electrical Machines.
Year: 1889

page_text: te of Application, 22nd Oct., 1839--Accepted, 7th Dec., 1889
COMPLETE SPECIFICATION.
Improvements in Dynamo Electrical Machines.
We WALTER THOMAS GOOLDEN of the firm of W. T. Goolden & Co. of Woodfield
Road Harrow Road in the County of Middlesex Electrical Engineers and HENRY
WILLOCK RAVENSHAW of the same place, 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 :-
This Invention has for its object to provide a dynamo electrical machine the
armature coils of which can be readily repaired without the necessity for taking the
machine to pieces.
According to this Invention the commutator sections or strips are brought into
the same plane as that in which is situated the side of the armaturo next the commu-
tator or beyond the said plane inwards of the said armature side and the armature
wires conductors or windings are led down to, and are hooked, or passed under the ends
of the said commutator sections or strips and are affixed thereto by screws, solder, or
other convenient means, so that the wires conductors or windings can be readily
removed and replaced. The frame, or support, for the field magnets is preferably
arranged on one side only of the armature each magnet having its pole piece extending
on both sides of the armature. The armature is of the disc type and its core is
preferably composed of a riband of soft iron wound with intervening insulation, on a
frame, or hub, on the armature shaft. This core may be encircled by wood, or other
insulating material, which should be provided with notches to receive the coils of the
armature wires conductors or windings. The winding may be done after the manner
of the winding of a Gramme armature. The commutator is preferably situated on the
side of the armature opposite to that on which the frame, or support, for the field
magnets is situated. The armature may be protected by covers between the field
magnet pole pieces. When it is desired to inspect, or repair, the armature the covers
are removed and the armature is turned until the part thereof to be inspected or
repaired is brought opposite an opening and thus the inspection or repairs can be made
without disturbing any other part of the machine.
The accompanying Drawings illustrate a dynamo electrical machine constructed
according to this invention. Figures 1 and 2 being elevations at right angles to each
other. Figure 1 being partly in section. Figure 3 shews part of the armature in
section and one of the commutator sections or strips illustrating the way of connecting
the wires conductors or windings to the sections or strips and of bringing the sections
or strips into position for such attachment according to this Invention. Figure 4 is
a view, at right angles to Figure 3, shewing part of the armature and its wires, con-
ductors or windings and two of the sections or strips.
A is the armature_shaft which may be mounted, and driven in the ordinary, or
any suitable way. B is the frame or support, carrying the field magnets C, the
pole pieces D, of which extend on both sides of the armature D, the wires, con-
ductors, or windings of which are marked e. The commutator F is so situated
that the sections or strips thereof are situated in the plane, or behind the plane,
in which the face of the armature, next the commutator, is situated and the said
sections or strips have an angled end at 2. The ends of the wires conductors or
windings of the armature are angled and passed under the ends f' of the sections
or strips as shewn clearly in Figures 3 and 4 and are secured thereto by screws
solder or other means of fastening which can be readily removed. The armature
is shewn as consisting of soft iron riband at e wound on the central piece or
hub e and having, around it, insulating material g, with grooves g³ in it for the
reception of the armature wires, conductors or windings. H is one of the covers,
extending from pole piece to pole piece, and affixed by screws or other fastening
devices which can be readily removed.

page_text: Having now particularly described and ascertained the nature of our said Inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. In a dynamo electrical machine with disc armature a commutator so situated, or
with its sections or strips so angled, or arranged, that the points of connection of the
sections or strips with the arinature conductors are situated in the same plane, or
behind the same plane, as that in which the face of the armature next the commutator
is situated, and armature wires conductors or windings engaging with the ends of the
said sections or strips, substantially as hereinbefore described.
2. The arrangement and combination of parts constituting a dynamo electrical
machine substantially as herein before described and illustrated in the accompanying
drawings.
J. H. JOHNSON & Co.,
Agents.