Improvements in Dynamo Electric Machines.
Year: 1891

page_text: Date of Application, 9th June, 1891
Complete Specification Left, 9th Mar., 1892-Accepted. 16th Apr.. 1592
PROVISIONAL SPECIFICATION.
Improvements in Dynamo Electric Machines.
I WILLIAM ALDRED 5 Brightside Bank Brightside Sheffield do hereby declare
the nature of this invention to be as follows:-
This invention consists of two armatures mounted parallel on one shaft the said
armatures are wound with a continuous coil on each and are connected together in
the same manner as when connecting right and left-handed limbs of an horseshoe
electro magnet when they are to be respectively, N. & S. The two armatures
work in a uni-directional field each armature being under the direct influence of
one pole of magnetism only or uni-polar. The outside connections are brought to
two plain rings which will be respectively negative and positive thus forming a
direct continuous current without the aid of commutation.
Dated this 8th day of June 1891.
WILLIAM ALDRED.
COMPLETE SPECIFICATION.
Improvements in Dynamo Electric Machines.
I WILLIAM ALDRED of 5 Brightside Bank Brightside Sheffield, 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 :-
-
My invention relates to improvements in dynamo-electric machines and refers.
to an improved construction of armature for the same having for its object to
produce a continuous current without the use of a commutator. My improved
armature consists of two rings wound in the same manner as the rings in Gramme's
dynamo-electric machines and connected together by S shaped wire loops, this
connection resembling that effected between the two poles of a horse shoe magnet
which are N and S respectively. The two armatures are mounted close together
upon a common shaft and the outside ends of the armature circuit are connected
to a collector revolving with the shaft aforesaid and composed of two metallic rings
insulated both from the shaft and one from the other, these rings forming the +
and the terminal of the said circuit. The polarity of the field magnets is N on.
one side of the armature and S on the other so that this armature revolves in the
uni-directional field of magnetic force thus produced, its axis of rotation being
transverse to the lines of force of the magnetic field. In the accompanying drawings
Figure 1 is an elevation of my improved armature, Figure 2 being a diagram-
matical view of the same with the rings removed from the shaft for the purpose of
showing their connection. The two rings R. R are mounted on the shaft a with
the collectors b. c to which they are connected by the wires W W, while the wire W¹
unites the said rings together as shewn. The latter consist of a hub h having
four spokes or arms e preferably of magnetic material-arranged at right angles,
and of a core provided with continuous coils of insulated wire such as fand with a
number of rectangular rings d or projections of non-magnetic material.
The
collectors and c are mounted upon a sleeve s keyed on the shaft a and thus
revolve with the latter; they are connected by suitable brushes (not shewn) to
the outside circuit. My invention is likewise applicable to drum armatures.
Price 8d 1

page_text: 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,
In dynamo-electric machines the improved construction of armature substantially
as herein described and shewn for the purpose of producing a continuous current
without the use of a commutator.
Dated this 9th March 1892.
JAMES STEVENSON,
Gray's Inn Chambers, 20, High Holborn, W.C., Agent for Applicant.