Improvements in Dynamo Electric Machines.
Year: 1887

page_text: Date of Application, 16th Feb., 1887
Complete Left, 16th Nov., 1887
Complete Accepted, 27th Jan., 1888
PROVISIONAL SPECIFICATION.
Improvements in Dynamo Electric Machines.
I, FERDINAND BOSSHARDT of the firm of F. Bosshardt & Co. of 4 Corporation
Street, Manchester in the County of Lancaster, Patent Agent, do hereby declare the
nature of this invention which has been communicated to me from abroad by August
Louis Hillaire Desbois of Angers in the Republic of France, Electrical Engineer, to
be as follows :-
This invention relates to improvements in dynamo electric machines and has
principally for its object to regulate automatically the strength of the electric current
should it become irregular, or diminish or augment the resistance of the cirenit
without augmenting or diminishing the intensity of the lamps attached thereto, as
well as to give all the organs of the dynamo electric machine less friction and con-
sequently, less wear, and to obtain a constant electro-motive force under varying
conditions, in the exterior circuit.
The electric current is created in all machines by reason of the velocity of the
armature in front of the cores of the electro magnets, the poles of which present
themselves successively for induction.
To obtain the automatic balance between the armature and the electro-magnets 1
cause these electro-magnets to revolve in a reverse or opposite direction to the
armature, so that, if the one is accelerated the other diminishes in velocity and forms
therefore an automatically governed balance, regulated by a differential movement
controlled by the speed of the revolving electro-magnets, and currents of the same.
In carrying out these improvements the dynaino electric machine is principally
composed as follows:-
A ring, called an armature, is employed, which turns round in front of the poles of
the electro-magnets at a varying velocity. A series of electro-magnets, four, eight,
or sixteen, in number, in one or two rows, each electro magnet being provided with
terminals to allow of their being coupled up for intensity or quantity, according to
requirement, either for lighting or for the transmission of power etc.
The electro magnets I cause to turn, in a reverse direction to the armature, and as
a velocity half that of the same, that is to say, if the armature makes 300 revolutions,
the electro-magnets make 150, in all 451) turns.

page_text: After once the machine has been regulated, as required, and to obtain its given
maximum speed, and in order to avoid the excess or loss of power, a differential
movement is employed consisting of two cones mounted side by side, the one con-
trolling the armature, and the other, the electro-magnets, which are in contact with
a friction pulley or with a strap, the tendency of which is to move to the middle of
the cones.
This pulley or strap is brought in communication, by means of a rod, either with
a special regulator or a galvanometer, of which the amplitude of the needle, causes
the pulley or strap to be displaced on the cones.
At this moment the differential movement produces its effect, and retains the
machine at the same power.
If there is an increase of speed, the regulator or galvanometer acts on the cones,
displaces the pulley or strap, and diminishes the speed of the electro magnets, there
being a constant connection between the cones, whether a pulley or strap is
employed.
As the action of the speed of the electro magnets on the armature is very sensitive,
it causes an automatic regulation when the motor is running irregularly, or when the
resistance of the circuit changes.
F. BOSSHARDT & Co.,
Agents to Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Dynamo Electric Machines.
I, FERDINAND BOSSHARDT, of the firm of F. Bosshardt & Co., of 4 Corporation
Street, Manchester in the County of Lancaster, Patent Agent, do hereby declare the
nature of this invention, which has been communicated to ine from abroad by
Auguste Louis Hillaire-Desbois of Angers in the Republic of France Electrical
Engineer, and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement:-
This invention relates to improvements in dynamo electric machines and has
principally for its object to regulate automatically the strength of the electric current
should it become irregular, or diminish or augment the resistance of the circuit.
without augmenting or diminishing the intensity of the lamps attached thereto, as
well as to give all the organs of the dynamo electric machine less friction and con-
sequently less wear, and to obtain a constant electro-motive force under varying
conditions, in the exterior circuit.
The electric current is created in all machines by reason of the velocity of the
armature in front of the cores of the electro magnets the poles of which present
themselves successively for induction.
To obtain the automatic balance between the armature and the clectro magnets I
cause these electro magnets to revolve in a reverse or opposite direction to the
armature, so that, if the one is accelerated, the other diminishes in velocity and forms
therefore an automatically governed balance regulated by a differential movement
controlled by the speed of the revolving electro-magnets, and currents of the same.
And in order that my inventi n may be better understood I have caused to be
appended hereunto one sheet of drawings marked with letters of reference indicating
like parts throughout the various figures.
Figs. 1 & 3 are end views. Fig. 2 a plan, and Fig. 4 a side clevation, of my
improved electric machine.
In carrying out these improvements the dynamo electric machine is principally
composed as follows:-
A ring D, called an armature, fixed on the shaft A, driven by means of the pulley P
is employed, which turns round in front of the poles of the electro-magnets Fat a
varying velocity, two brushes B being in constant contact therewith. A series of
electro magnets F, four, eight, or sixteen, in number, in one or two rows, suitably
fixed to a ring revolving inside a circular frame with a base S, and kept in position
by lugs X, each electro magnet being provided with terminals to allow of their being
coupled up for intensity or quantity, according to requirement, either for lighting or
for the transmission of power, etc.
The electro-magnets F by means of the wheels O & E, 1 cause to turn in a reverse
direction to the armature D, and at a velocity half that of the same, that is to
say, if the armature makes 300 revolutions, the electro magnets make 150, in all
450 turns.

page_text: To the revolving electro magnets are connected two copper tubes H&J, which
serve as current collectors, and against which bear the springs m & n, the threads Q
causing a derivation of the current onto the said springs m & n.
After once the machine has been regulated, as required, and to obtain its given
maximum speed, and in order to avoid the excess or loss of power, a differential
movement is employed consisting of two cones C, C, mounted side by side, the one
controlling the armature D, and the other the electro magnets F, which cones C, O,
are in contact with a friction pulley G or with a strap, the tendency of which is to
move to the middle of the cones C, C.
This pulley or strap is brought in communication by means of a rod 9, either with
a special regulator or governor R driven from the shaft A by means of the strap K,
or a galvanometer, of which the amplitude of the needle causes the pulley or strap to
be displaced on the cones C. C.
At this moment the differential movement produces its effect, and retains the
machine at the same power.
If there is an increase of speed, the regulator or governor R or galvanometer, acts
on the cones C, GC, displaces the pulley G or strap, and diminishes the speed of the
electro magnets F there being a constant connection between the cones C, C, whether
a pulley or strap is employed.
As the action of the speed of the electro magnets F on the armature D is very
sensitive, causes an automatic regulation when the motor is running irregularly, or
when the resistance of the circuit changes.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed I declare that what I claim is:-
in dynamo electric machines in which the electro magnets are made to revolve in a
direction opposite to the armature, the application of a pair of cones C, C, on which
revoives a pulley G or strap, under the control of a governor R, or galvanometer,
substantially as and for the purpose specified.
Datad Naramban th:l. A 11 1607
F. BOSSHARDT & Co.,
4. Corporation Street, Manchester,
Agents to Applicant.