Improvements in Dynamo Electric Generators.
Year: 1891

page_text: Date of Application, 7th Aug., 1891
Complete Specification Left, 7th May, 1892-Accepted, 18th June, 1892
PROVISIONAL SPECIFICATION.
Improvements in Dynamo Electric Generators.
1 JEAN HENRY CAZAL, of Rue Censier, Paris, in the Republic of France,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention for improvements in dynamo electric generators has for its object
to provide an improved construction of inducer or field magnets for continuous or
alternating current dynamo electric generators and consists essentially of a
single annular coil of wire provided on each side with a cheek on which are
formed the poles, the poles of one cheek alternating with those of the other.
In an inducer or field magnet constructed according to this invention, a single
wire is wound circumferentially round a bobbin to form a coil and to cach side of
the bobbin is secured an iron disc having projecting parts extending over the
circumference of the coil. The projections from the two discs alternate round the
circumference of the coil and as the projections from the dise on one side are of
opposite polarity to those from the other, a series of alternating poles are formed
round the coil. The relative motion of the inducer or field magnets and the
armature will generate alternating currents in the armature which may be commu-
tated by any suitable commutator to continuous currents.
Dated this 7th day of August 1891.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, W.C., Agents.
COMPLETE SPECIFICATION.
Improvements in Dynamo Electric Generators.
I, JEAN HENRY CAZAL, of Rue Censier, Paris, in the Republic of France,
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 for improvements in dynamo electric generators has for its object
to provide an improved construction of inducer or field magnets for continuous
or alternating current dynamo electric machines and consists essentially of a
single annular coil of wire provided on each side with a cheek on which
are formed the poles, the poles of one cheek alternating with those of the other.
In an inducer or field magnet constructed according to this invention, a single
wire is wound circumferentially round a bobbin to form a coil and to each side of
the bobbin is secured an iron disc having projecting parts extending over the
circumference of the coil. The projections from the two discs alternate round the
circumference of the coil and as the projections from the disc on one side are of
opposite polarity to those from the other, a series of alternating poles are formed
round the coil. The relative motion of the inducer or field magnets and the
armature will generate alternating currents in the armature which may be commu-
tated by any suitable commutator to continuous currents.
In the accompanying sheet of illustrative drawings
Figs. 1 and 1 represent in side elevation and section a two pole magnet
constructed according to this invention, and
Fig. 2 is a cross section of the same.
Figs. 3 and 3 represent in cross section and end elevation a multipolar magnet
constructed according to this invention and
Figs. 4 and 44 are side elevation and section of the same.

page_text: The continuous wire G is wound on the bobbin F between its two cheeks
and is connected by means of brushes to the exciting source of electricity. Iron
discs H and are secured by screws M to the two cheeks of the bobbin Fand are
provided with pole pieces L and K which project over the circumference of the
bobbin, and the pole pieces L of the disc I alternate round the circumference of the
bobbins with those K of the disc H. The magnet is mounted upon a shaft E when
it is rotated.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
:-
1. The construction of a magnet with a continuous wire wound between the cheeks
of a bobbin to which cheeks the pole pieces are alternately attached substantially
as described.
2. The improvements in dynamo electric machines substantially as described with
reference to Figs. 1 to 2 or with reference to Figs. 3 to 4 of the drawings.
Dated this 7th day of May 1892.
WHEATLEY & MACKENZIE,
40, Chancery Lane, London, Agents.