IMPROVEMENTS IN DYNAMO-ELECTRIC AND ELECTRO-DYNAMIC MACHINES
Year: 1882

page_text: LETTERS PATENT to John Imray of No 28 Southampton Buildings Chancery
Lane in the County of Middlesex for an invention of "IMPROVEMENTS
IN DYNAMO-ELECTRIC AND ELECTRO-DYNAMIC MACHINES" Communicated to
him from abroad by Paul Jablochkoff of Paris France Engineer
PROVISIONAL SPECIFICATION left by the said John Imray at the Office of
the Commissioners of Patents on the 13th June 1882
JOHN IMRAY of No 28 Southampton Buildings Chancery Lane in the County
of Middlesex "IMPROVEMENTS IN DYNAMO-ELECTRIC AND ELECTRO-DYNAMIC
MACHINES" [A communication to him from abroad by Paul Jablochkoff of Paris
France Engineer.]
This Invention relates to the construction and arrangement of dynamo-electric
or electro-dynamic machines in a simple form the leading feature of which is the
obliquity of the axis of rotation to the magnetic field, as the axis of the earth is
inclined to the plane of the ecliptic. Machines presenting this feature may be
arranged in various ways some of which I will describe. According to a simple
form, an iron bobbin coiled with insulated wire between two flanges is fixed
obliquely on its axis and revolves between two diametrically opposite magnetic
poles; the inclination of the bobbin to its axis is such that when the edge of the
flange on one side presents itself to the one pole the opposite edge of the other
flange presents itself to the other pole. Instead of employing two diametrically
opposite poles, a circular magnetic field may be employed consisting of an annular
solenoid or an electromagnet having its coil wound on iron or cased over with
iron so that the opposite sides have opposite magnetic polarity. This annular
solenoid or field magnet is fixed at an inclination to the axis of rotation such that
when the edge of one of the flanges of the armature bobbin presents itself to one
side of the field the opposite edge of the other flange of the armature presents
itself to the other side of the field. The electric currents developed by the
revolution of the armature bobbin are collected in the ordinary way by the brushes
of a commutator, and may be wholly or in part employed as usual to excite the
field magnet.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Imray in the Great Seal Patent Office on the 12th December
1882.
JOHN IMRAY of No 28 Southampton Buildings, Chancery Lane in the County
of Middlesex "IMPROVEMENTS IN DYNAMO-ELECTRIC AND ELECTRO-DYNAMIC
MACHINES" A communication to me from abroad by Paul Jablochkoff of Paris,
France (Engineer)
This Invention relates to the construction and arrangement of dynamo electric
or electro dynamic machines in a simple form the leading feature of which is the
obliquity of the axis of rotation to the magnetic field, as the axis of the earth is
inclined to the plane of the ecliptic. Machines presenting this feature may be
arranged in various ways some of which I will describe. According to a simple
form, an iron bobbin coiled with insulated wire between two flanges is fixed
obliquely on its axis and revolves between two diametrically opposite magnetic
poles; the inclination of the bobbin to its axis is such that when the edge of the
flange on one side presents itself to the one pole the opposite edge of the
other flange presents itself to the other pole. Instead of employing two
diametrically opposite poles, a circular magnetic field may be employed consisting
of an annular solenoid or an electromagnet having its coil wound on iron or cased
over with iron so that the opposite sides have opposite magnetic polarity. This
annular solenoid or field magnet is fixed at an inclination to the axis of rotation such
that when the edge of one of the flanges of the armature bobbin presents itself to
one side of the field the opposite edge of the other flange of the armature presents
itself to the other side of the field. The electric currents developed by the
revolution of the armature bobbin are collected in the ordinary way by the
brushes of a commutator, and may be wholly or in part employed as usual to excite
the field magnet
DESCRIPTION OF THE DRAWINGS.
Fig 1 is a diagram shewing a simple form of machine. A bobbin A having
cheeks a b of soft iron and wound with a coil of insulated wire is fixed obliquely
on an axis O and revolves between the poles of two electromagnets N and S. The
obliquity of the bobbin is such that in each revolution it presents the edges of a
and b alternately to the poles of N and S, and the cheeks a and b having there
induced polarity thus alternated, alternating electric currents are set up in the coil
of A. Fig 2 shews a construction in which the bobbin B fixed obliquely on the
axis O revolves within an oblique bobbin C, which has an iron sheath F presenting
interior polar edges towards the edges of B. The electric currents generated in the
coil of B are collected and converted into currents of uniforın direction by means
of a commutator D of ordinary construction. In the construction shewn in Fig: 3
the exterior bobbin C is of soft iron constituting a solenoid The commutator D
may be applied as shewn to alternate the currents in the coil of C, those in the coil
of B being constant in direction, collected in the usual way by rubbers bearing on
rings at E. In this case the internal bobbin B need not be of soft iron. When the
machine is of large diameter the interior bobbin A may be as shewn in Fig: 4
merely a ring of iron fixed on a wheel of non magnetic material.
Obviously machines constructed and arranged as above described may be
employed either as dynamo-electric machines converting motive power into
electricity or as electro-dynamic machines converting electricity into motive power
They present the advantage of great simplicity of construction, and they require no
nice adjustments.

page_text: Having thus described the nature of the said Invention and in what manner the
same is to be performed as communicated to me by my foreign correspondent I
claim :-
The construction of dynamo-electric or electro-dynamic machine in which a
magnetic coiled bobbin fixed obliquely on an axis revolves between or within polar
fields so as to present its opposite edges to opposite fields alternately substantially
as herein described
In witness whereof I the said John Imray have hereunto set my hand and
seal this Twelfth day of December in the year of our Lord, One thousand
eight hundred and eighty two
JOHN IMRAY (L.S.)