Improvements in Electric Generators.
Year: 1888

page_text: This Specification was, upon the 27th day of August 1891, Amended under
Sections 18 to 21 of the Patents, Designs, and Trade Marks Act, 1883.
Date of Application, 9th Aug., 1888
'
Complete Specification Left, 9th May, 1889-Accepted, 15th June, 1889
PROVISIONAL SPECIFICATION.
Improvements in Electric Generators.
We, LAZARUS SIMON MAGNUS PYKE, Mechanical Engineer, and HARRY THEODORE
BARNETT, Electrician, both of Devonshire Place House, Regent's Park, in the County
of Middlesex, do hereby declare the nature of our invention to be as follows:-
:-
We produce electric currents by revolving a magnetic inductor or inductors in
proximity to a magnet provided at one pole or at both poles with two or more polar
projections, serving as cores for the conductor or conductors in which the current is
to be induced, the object of the inductor or inductors being to complete the magnetic
circuit alternately through each set of polar projections.
The inducing magnetism may either be permanent, or it may be produced by an
exciting current.
We prefer to employ an even number of polar projections and to arrange the revolving
inductor or inductors so, that in proportion as one pole is being demagnetized, the
magnetism of the other pole or set of poles increases and vice versa, the total magnetic
effect thus being always approximately constant.
We also prefer to arrange the induced current conductor so, that the polar projec-
tions which are being magnetized and those which are being demagnetized havo a
similar inducing action upon it, the magnetizing of one set of cores or polar pro-
jections thus increasing the effect produced on the same wire by the demagnetization
of the other set of cores or polar projections.
In the industrial application of this invention, we prefer to arrange the polar
projections in two concentric or co-axial circles, and if the magnetism of the inductor
is produced by electricity, we prefer to arrange the inducing wire as a single coil
completely surrounded by iron, except at the zone in which the polar projections are
situated.
We prefer to divide or laminate all magnetisable parts, both in the inductor and in
tho induced poles, where the magnetism is subject to rapid variations.
The advantages of this invention may be stated as follows: Both the inducing and
the induced current coils, together with the inducing magnet and its cores, are
stationary; and the closed magnetic circuit ensures a large amount of magnetism
in comparison with the exciting current.
DL: Oth do of Ant
1000
COMPLETE SPECIFICATION (AMENDED).
Improvements in Electric Generators.
We, LAZARUS SIMON MAGNUS PYKE, Mechanical Engineer, and HARRY THEODORE
BARNETT, Electrician, both of Devonshire Place House, Regent's Park, in the County
of Middlesex, 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 :-
!.i
We produce electric currents by revolving a magnetic inductor or inductors in

page_text: proximity to a magnet provided at one pole or at both poles with two or more polar
projections, serving as cores for the conductor or conductors in which the current is
to be induced, the object of the inductor or inductors being to complete the magnetic
circuit alternately through each set or sets of polar projections.
The inducing magnetism may be either permanent, or it may be produced by an
exciting current.
We prefer to employ an even number of polar projections and to arrange the
revolving inductor or inductors so that, in proportion as one pole is being demagnetized,
the magnetizin of the other pole, or set of poles, increases, and vice versâ ; the
total magnetic effect thus being approximately constant.
We also prefer to arrange the induced current conductor so that the polar projec-
tions which are being magnetized and those which are being demagnetized have a
similar inducing action upon it, the magnetizing of one set of cores or polar projec-
tions thus increasing the effect produced on the same wire (or other conductor) by the
demagnetization of the other set of cores or polar projections.
In the further description of our invention, reference will be made to the accom-
panying drawings, in which Fig. 1 is a longitudinal section and Fig. 2 a front
elevation of a duplex machine embodying this invention. In the left half of Fig. 2
the revolving inductors are omitted, so as to show the polar projections and the coils
situated behind the inductors.
The polar projections a, a and b 61 on each face or half of this machine form two
concentric circles, and the inducing wires form a single coil situated in the annular
space A and surrounded by iron on all sides, except at the narrow zone z between the
polar projections.
J, J, are the sets of revolving inductors, one on each face of the machine. Each
set of inductors is formed by a number of iron segments extending radially from the
circumference of a hub or carrier C of phosphor bronze, and secured thereto by
means of a ring c and screw bolts as shown. The hub is keyed to the revolving
shaft S and secured by a screw nut s.
B is the inducing magnet, provided with annular recesses A for the two inducing
coils D covered at the outside with discs d. This coil is supplied with current from an
exciting dynamo or other convenient source.
The segments of the revolving inductor, as well as the projecting pole pieces a, a¹, b, b',
are composed of thin plates of soft iron separated from each other by short distance
pieces of insulating material to prevent the generation of Foucault Currents. In the
pole pieces, the iron plates are arranged in concentric circles, while in the inductor
they are radial, as shown.
The induced current conductors or secondary coils f and f¹, 9 and 9', are wound
on the pole pieces a, a, b b' and may be connected with each other in series, in
parallel, or in groups.
During the revolution of the inductors, the poles a, a, and b, b, are simultaneously
magnetized, while the poles a¹, a¹, and 6', 6', are simultaneously demagnetized, and
vice versa, the magnetic circuit formed by the iron which encloses the primary
coil D, being alternately completed either through the pole pieces a and b, or through
the pole pieces a', and 6', according to the position of the nearest segments of the
revolving inductor J (the latter being alternately situated opposite the poles a, b, and
opposite the poles a¹, b¹).
In Fig. 2 the tangential width of the iron segments constituting the inductor is
approximately equal to the blanks or air spaces between them, and to the distance
from centre to centre of contiguous pole pieces, the object being to render the
magnetizing effect of a segment on a pair of poles equal to the demagnetizing effect
on a pair of adjoining poles.
The principal advantages of this class of generators are as follows;-
Both the inducing and the induced current coils, with the inducing magnet and its
cores, are stationary; and the enclosed magnetic circuit ensures a large amount of
magnetism in comparison with the exciting current.
We are aware, that others have proposed to construct dynamo machines in which

page_text: the conductor for the inducing current and that for the induced current, as well as the
magnetizable mass, are stationary, while one or more magnetic inductors are caused to
revolve; and we do not, therefore, claim this fundamental principle. The principal
feature of novelty of our dynamo machine consists in arranging the pole pieces, or
polar projections, of the magnet or magnetizable mass, in pairs or groups which afford
alternative paths for the magnetism produced by the exciting current and assist each
other in the production of induced currents.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we would have it under-
stood that we make no claim to any electric generator excepting such as have the segments
of the inductor of approximately equal breadth to the distance from centre to centre
of contiguous pole pieces, but subject to the above limitation we declare that what we
claim is ;-
1. An electric generator comprising in its construction a stationary magnet,
provided on each pole with two projections or sets of projections on which is wound
the conductor of the current to be produced (or the secondary coil), and a system of
magnetic inductors adapted to revolve in proximity to the said magnet so as to
commute its lines of force, substantially as described.
2. In an electric generator of the type specified in Claim 1, an exciting or field coil
completely surrounded by iron except at the zone, where the polar projections are
situated, substantially as described.
3. In an electric generator, the combination of a hollow stationary magnet, having
polar projections arranged in pairs in concentric circles; an exciting or field coil
situated in the annular hollow of the said magnet, and surrounded by the same on all
sides except at the narrow zone, situated between the polar projections; secondary
coils or induced conductors wound on the polar projections of the magnet and arranged
in one or more circuits, a system of magnetic inductors situated in a circle in front of
the polar projections and at suitable distances apart; and a revolving shaft or carrier
supporting the said magnetic inductors, substantially as described.
Dated this 0th day of Mar 1000
L. S. M. PYKE.
H. T. BARNETT.
By Fairfax & Wetter,
433, Strand, London, Agents.

page_text: Date of Application, 9th Aug., 1888
Complete Specification Left, 9th May, 1889-Accepted, 15th June, 1889
PROVISIONAL SPECIFICATION.
Improvements in Electric Generators.
We, LAZARUS SIMON MAGNUS PYKE. Mechanical Engineer, and :HARRY THEODORE
BARNETT. Electrician, both of Devonshire Place House, Regent's Park, in the County
of Middlesex, do hereby declare the nature of our invention to be as follows:-
We produce electric currents by revolving a magnetic inductor or inductors in
proximity to a magnet provided at one pole or at both poles with two or more polar
projections, serving as cores for the conductor or conductors in which the current is
to be induced, the object of the inductor or inductors being to complete the magnetic
circuit alternately through each set of polar projections.
The inducing magnetism may either be permanent, or it may be produced by an
exciting current.
We prefer to employ an even number of polar projections and to arrange the revolving
inductor or inductors so, that in proportion as one pole is being demagnetized, the
magnetism of the other pole or set of poles increases and vice versa, the total magnetic
effect thus being always approximately constant.
We also prefer to arrange the induced current conductor so, that the polar projec-
tions which are being magnetized and those which are being demagnetized have a
similar inducing action upon it, the magnetizing of one set of cores or polar pro-
jections thus increasing the effect produced on the same wire by the demagnetization
of the other set of cores or polar projections.
In the industrial application of this invention, we prefer to arrange the polar
projections in two concentric or co-axial circles, and if the magnetism of the inductor
is produced by electricity, we prefer to arrange the inducing wire as a single coil
completely surrounded by iron, except at the zone in which the polar projections are
situated.
We prefer to divide or laminate all magnetisable parts, both in the inductor and in
the induced poles, where the magnetism is subject to rapid variations.
The advantages of this invention may be stated as follows: Both the inducing and
the induced current coils, together with the inducing magnet and its cores, are
stationary; and the closed magnetic circuit ensures a large amount of magnetism
in comparison with the exciting current.
Dated this 9th day of August 1888.
FAIRFAX & WETTER,
433, Strand, London, Agents.
COMPLETE SPECIFICATION.
Improvements in Electric Generators.
We, LAZARUS SIMON MAGNUS PYRE, Mechanical Engineer, and HARRY THEODORE
BARNETT, Electrician, both of Devonshire Place House, Regent's Park, in the County
of Middlesex, 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 :-
We produce electric currents by revolving a magnetic inductor or inductors in
proximity to a magnet provided at one pole or at both poles with two or more polar
projections, serving as cores for the conductor or conductors in which the current is
to be induced, the object of the inductor or inductors being to complete the magnetic
circuit alternately through each set or sets of polar projections.

page_text: $
The inducing magnetism may be either permanent, or it may be produced by an
exciting current.
We prefer to employ an even number of polar projections and to arrange the
revolving inductor or inductors so that, in proportion as one pole is being demagnetized,
the magnetism of the other pole, or set of poles, increases, and vice versá; the
total magnetic effect thus being approximately constant.
We also prefer to arrange the induced current conductor so that the polar projec-
tions which are being magnetized and those which are being demagnetized have a
similar inducing action "pon it, the magnetizing of one set of cores or polar projec-
trons thus increasing the effect produced on the same wire (or other conductor) by the
demagnetization of the other set of cores or polar projections.
n the further description of our invention, reference will be made to the accom-
panying drawings, in which Fig. 1 is a longitudinal section and Fig. 2 a front
elevation of a duplex machine embodying this invention. In the left half of Fig. 2
the revolving inductors are omitted, so as to show the polar projections and the coils
situated behind the inductors.
:"
The polar projections a, a and b on each face or half of this machine form two
concentric circles, and the inducing wires form a single coil situated in the annular
space A and surrounded by iron on all sides, except at the narrow zone z between the
.polar.projections.
J, J, are the sets of revolving inductors, one on each face of the machine. Each
set of inductors is formed by a number of iron segments extending radially from the
.circumference of a hub or carrier of phosphor bronze, and secured thereto by
means of a ring c and screw bolts as shown The hub C is keyed to the revolving
shaft S and secured by a. screw nut s.
:
Bis, the inducing magnet, provided with annular recesses A for the two inducing.
coils D covered at the outside with discs d. This coil is supplied with current from an
exciting dynamo or other convenient source.
:.
The segments of the revolving inductor, as well as the projecting pole pieces a, a, b, b¹,
are composed of thin plates of soft iron separated from each other by short distance
pieces of insulating material to prevent the generation of Foucault Currents. In the
pole pieces, the iron plates are arranged in concentric circles, while in the inductor
they are radial, as shown.
The induced current conductors or secondary coils fand f¹, g and g', are wound
on the pole pieces a, a, b b¹ and may be connected with each other in series, in
parallel, or in groups.
During the revolution of the inductors, the poles a, a, and b, b, are simultaneously
magnetized, while the poles a¹, a¹, and 61, 61, are simultaneously demagnetized, and
vice versa, the magnetic circuit formed by the iron which encloses the primary
coil D, being alternately completed either through the pole pieces a and b, or through
the pole pieces a', and b, according to the position of the nearest segments of the
revolving inductor J (the latter being alternately situated opposite the poles a, b, and
opposite the poles a¹, b¹).
In Fig. 2 the tangential width of the iron segments constituting, the inductor is
approximately equal to the blanks or air spaces between them, and to the distance
from centre to centre of contiguous pole pieces, the object being to render the
magnetizing effect of a segment on a pair of poles equal to the demagnetizing effect
on a pair of adjoining poles.
The principal advantages of this class of generators are as follows
. Both the inducing and the induced current coils, with the inducing magnet and its
cores, are stationary; and the enclosed magnetic circuit ensures a large amount of
magnetism in comparison with the exciting current.
We are aware, that others have proposed to construct dynamo machines in which
the conductor for the inducing current and that for the induced current, as well as the
magnetizable mass.. are stationary, while one or more magnetic inductors are caused to
revolve; and we do not, therefore, claim this fundamental principle. The principal

page_text: feature of novelty of our dynamo machine consists in arranging the pole pieces, or
polar projections, of the magnet or magnetizable mass, in pairs or groups which afford
alternative paths for the magnetism produced by the exciting current and assist each
other in the production of induced currents.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what wer
claim is ;-
1. An electric generator comprising in its construction a stationary magnet,
provided on each pole with two projections or sets of projections on which is wound
the conductor of the current to be produced (or the secondary coil), and a system of
magnetic inductors adapted to revolve in proximity to the said magnet so as to:
commute its lines of force, substantially as described.
2. In an electric generator of the type specified in Claim 1, an exciting or field coil-
completely surrounded by iron except at the zone, where the polar projections are
situated, substantially as described.
3. In an electric generator, the combination of a hollow stationary magnet, having
polar projections arranged in pairs in concentric circles; an exciting or field coil..
situated in the annular hollow of the said magnet, and surrounded by the same on all
sides except at the narrow zone, situated between the polar projections; secondary
coils or induced conductors wound on the polar projections of the magnet and arranged.
in one or more circuits, a system of magnetic inductors situated in a circle in front of
the polar projections and at suitable distances apart; and a revolving shaft or carrier-
supporting the said magnetic inductors, substantially as described.