IMPROVEMENTS IN DYNAMO ELECTRIC OR MAGNETO ELECTRIC MACHINES
Year: 1882

page_text: LETTERS PATENT to Désiré Thounas Piot of Great Titchfield Street in the
County of Middlesex, for an invention of "IMPROVEMENTS IN DYNAMO
ELECTRIC OR MAGNETO ELECTRIC MACHINES."
PROVISIONAL SPECIFICATION left by the said Désiré Thomas Piot at
the Office of the Commissioners of Patents on the 6th April 1882.
DÉSIRÉ THOMAS PIOT of Great Titchfield Street in the County of Middlesex
"IMPROVEMENTS IN DYNAMO-ELECTRIC OR MAGNETO-ELECTRIC MACHINES."
This invention relates to machines known as Dynamo-electric and Magneto-
electric Machines.
According to this invention a number of bobbins the cores of which may either
be of metal or other suitablo substance covered with copper wire and insulated in
the ordinary way are arranged cylindrically and in radial lines to an axis on
which they are mounted and with which they are parallel thus forming cylinders
which constitute the armatures.
The said armatures revolve between the interior and exterior of the poles of
electro or permanent magnets of horseshoe form. These magnets are placed so that
their poles may correspond with the radial lines of bobbins aforesaid. Thus as the
armatures revolve each bobbin will be brought successively opposite the poles of
the magnets until the whole number arranged on the radial lines are brought in a
line with the ends of the poles of the magnets and as one series of bobbins leaves
the magnets the next follows in the same way and so on.
The commutator may be of ordinary construction and made according to the
number of bobbins and magnets employed.

page_text: observe that the bobbins being arranged compactly in radial lines there are no
lost intervals and by the addition of the armatures which turn opposite the
exterior of the poles of the magnets an extra source of production is obtained
which can be employed as an exciter so as to dispense with the employment of a
separate machine for this purpose. The armatures composed of bobbins F. Fl.
serve as an exciter when applied to a dynamo machine but when applied to a
magneto machine the current produced by such bobbins may be added to that
produced by the interior armature or used separately. Although I have described
and shewn 3 bobbins on each radius this number may be either increased or
diminished to suit requirements the same remark applies to the number of radii
and to the number of field magnets. I would also observe that the bobbins F F
may be in radial series similar to the bobbins F, F, the machine being constructed
accordingly. The magnets may be made to revolve and the armatures remain
stationary but I prefer the revolving armatures. Having thus described the
nature and object of my said invention and the means whereby the same may be
carried into practical effect I would remark in conclusion that I do not intend to
limit myself to the precise details I have described and shewn as the same may
be varied without departing from the principle of my said invention but what I
claim as my invention and desire to secure by the bereinbefore in part recited
Letters Patent is,
'
Firstly. The arrangement of bobbins forming the armatures fixed in radial series
and parallel to the axis of rotation so that such series of bobbins may come between
the poles of the magnets which are suitably arranged for this purpose all
substantially as set forth.
Secondly. The employment of bobbins arranged so that they may come opposite
the exterior of the poles of the magnets in combination with those coming between
the poles substantially as set forth.
Thirdly. Dynamo electric and magneto electric machines constructed substantially
as set forth.
In Witness whereof I the said Désiré Thomas Piot have hereunto set my