An Improved Continuous Current Dynamo-electric Machine.
Year: 1897

page_text: Date of Application, 15th Sept., 1897-Accepted, 30th Oct.,
1897
COMPLETE SPECIFICATION.
An Improved Continuous Current Dynamo-electric Machine.
I, ARTHUR EDWIN BADGER, of " Harborne " Orrong Road, Elsternwick, near
Melbourne in the Colony of Victoria, Architect 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 been devised in order to provide a simple and cheap yet
very effective dynamo-electric machine for generating constant continuous currents
of low electro motive force, but of considerable current strength, such as are
required for Electro plating electro-chemical manufacturing, electro-metallur-
gical operations, and the like.
To this end the rotating-armature must be of small internal resistance, and
whilst embracing the widest surface possible, the air space between it and the
inductors or field magnets is kept very small in order that the flux of force shall
have its maximum value, by eliminating unnecessary air resistance.
In order that my invention may be readily understood I will proceed to describe
same with reference to the accompanying drawings, wherein
Figure 1 is a central longitudinal section, with diagrammatic view of brushes
and connections.
Figure 2 an outside view and
Figure 3 a transverse section on line 3-3 Figure 1.
Figures 1, 2, and 3* are similar views showing a slight modification.
Similar letters of reference indicate similar parts in all the figures.
or
A represents the inductor or "field" magnet, which, comprises a peculiarly
shaped bell-magnet of high permeability, wound with coils of wire round the
upper end of the tongue. The winding may be either "series".." shunt"
'compound" as desired, although in the drawings, I have for convenience shewn
it as shunt wound a a representing the terminals from which the main circuit
is conducted.
B represents the annular armature mounted on a spindle which rotates in
suitable bearings. This armature consists of an iron body (which may be
laminated) and in the arrangement illustrated in Figures 1; 2 and 3 it has a
number (which may be varied) of longitudinal copper or other conductors C set
in grooves, as clearly shewn in Figure 3, so that said armature may rotate the
more closely to the field magnets, and thereby lessen the air space as before
mentioned.
At the ends of each of said longitudinal copper conductors are metallic collector
rings D D against which the brushes E E bear, and by short connections are
"circuited" to each other alternately as shewn diagrammatically in the drawings,
and finally the continuous current is led to the fields to make a ""series" dynamo,
or a shunt only may be taken as illustrated and the main current utilized for
such purposes as may be desired.
It will be observed that the armature B rotates within, and very closely to the
bell magnet, and in order that the brushes E may bear upon the rings D¹ on

page_text: the inner end of the armature, a slot F is made in the shell of said bell magnet
for said brushes to project through.
In the modification shown in Figures 1 2 and 3* the conductors C are dis-
pensed with the current being generated by the rotation of the armature in the
magnetic field between the poles. In this case only two collector rings are
employed one at each end of said armature. In other respects the machine and
its operation are the same as herein before described, the current generated being
however of lower voltage, if driven at the same speed.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed I declare that what I
claim is:-
First. My improved continuous current dynamo electric machine consisting of
the various parts constructed arranged and operating substantially as and for the
purposes herein described and explained and as illustrated in the accompanying
drawings.
Second. In a continuous current dynamo electric machine a bell shaped field
magnet A in combination with the armature B rotating within said field magnet
substantially as and for the purposes specified and as illustrated in the accom-
panying drawings.
Third. In a continuous current dynamo electric machine the armature B having
longitudinal copper or other conductors, set in grooves therein and having
collector rings at each end, the whole rotating within a bell shaped field magnet
substantially as and for the purposes specified and as illustrated in the accom-
panying drawings.
...
Dated this Third day of August One thousand eight hundred and ninety-seven.
A. E. BADGER.
Tongue & Birkbeck,
31, Southampton Buildings, Chancery Lane, London, W.C.
Agents for the Applicant.