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A, F, DELAFIELD,
DYNAMO ELECTRIC MACHINE,
No. 278,516, Patented May 29, 1883.

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WITNESSES
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ATTORNEYs.
 UNITED STATES PATENT OFFICE.
A, FLOYD DELAFIELD, OF NOROTON, CONNECTICUT.
DYNAMO-ELECTRIC MACHINE.
SPECIFICATION forming part of Letters Patent No. 278,516, dated May 29, 1883.
Application filed October 23, 1882, Model.)

To all whom it may concern: . around the core A' of the magnet A. from left
Be it known that I, A. FLOYD DELAFIELD, to right, and around the core J of the other
of Noroton, in the county of Fairfield, and magnet J from right to left, so that if the 55
State of Connecticut, have invented a new and pole of one pole-piece, B, of the magnet A is
Improved Dynamo-Electric Machine, of which positive, the pole-piece G of the magnets J
the following is a full, clear, and exact descrip will be negative, and vice versa; and if one
tion. pole of the magnet A is positive the opposite
The object of my invention is to provide a pole is negative, and the opposite correspond
new and improved dynamo-electric machine ing poles of the magnets J will be positive.
O which has a uniform magnetic field, and thus The current passes from the armature C through
does not require a commutator, whereby the the conductor b to the post F, from there to
entire construction of the machine will be ma the light, then through the coils of the magnets
terially simplified. J A to the binding-post E, the conductor a,
The invention consists in a dynamo-electric and to the armature.
IS machine constructed with a rotating metal The magnets may be excited by a separate
cylinder between a cylinder forming the head machine or battery; or the currents at one or
of a magnet, and a core within the rotating both ends of the machine can be conducted
cylinder, the outer cylinder, and the core lav through the magnets. 7O
ing opposite but uniform polarity. The ends The machine consists of a cylinder-armature
of the magnets may be attached to the ends of rotating between two cylindrical magnets on
the core, if desired. the inner and outer sides of the armature, the
Reference is to be had to the accompanying magnets having opposite polarity. The ma .
drawings, forming part of this specification, in chine has thus a uniform magnetic field, and
which similar letters of reference indicate cor for that reason no commutators are required.
2 5 responding parts in all the figures. Either the magnets A or J may be dis
Figure l is a longitudinal sectional elevation pensed with, for the induction from the re
of one end of my improved dynamo-electric maining magnet produces sufficient polarity
machine. Fig. 2 is a sectional plan view of in the cylinder B or core G (according as the
the same. Fig. 3 is a cross-sectional elevation magnets A cr: J have been dispensed with) to
of the same on the line aca, Fig. 1. operate the machine.
The core A of the field-magnet A has a trans Having thus described my invention, what
verse horizontal iron cylinder, B, secured to I claim as new, and desire to secure by Letters
the end. The said cylinder contains a metal Patent, is
cylinder or armature, C, which fits loosely 1. In a dynamo-electric machine, the combi
35 tlerein, and which is journaled in bearings D nation, with a field-magnet and a cylindrical
at the ends of the cylinder B, which bearings lhead, of a metal cylinder or armature revolv.
are made of conductive material, and are coin ing in said cylindrical head, and a core within
nected by conductors a b with the binding the cylinder, having its ends attached to mag
posts E. F. A cylindrical iron core, G, is con nets, substantially as herein shown and de
AO tained within the cylinder or armature, and scribed.
has its ends secured to standards H. The 2. In a dynamo-electric machine, the combi.
magnet B, the cylinder C, and the core G are nation, With the field-magnet A, having a cyl
concentric. The ends of the magnets J are indrical head, B, of the metal cylinder or arma 95
secured to the standards E. In place of one ture C within the said cylindrical head, the
45 magnet A a series of like magnets may be used; i core G within the armature, the magnets J,
but a single magnetis preferred. I have shown having their ends connected to the ends of the
and described but one end of the machine, as core G, and means for rotating said cylinder or
both ends are alike, with the exception that armature, substantially as herein shown and OO
the poles are reversed. A driving-pulley, K, described.
is formed on one end of each armature. The 3. In a dynamo-electric machine, the combi
wires of the magnet are wound around the nation, with the field-magnet A, having a cy.
s
core J of one magnet J from right to left, lindrical head, B, and the standards D, of the
 27s, 516
metal cylinder or armature C, journaled in the provided with the pulley K, of the core G, the
said standards, and provided with the pulley magnets J, having their ends secured to the
K, the core G, the magnets J, having their ends of the core, the conductors a, b, connected
ends attached to the ends of the core, and to the standards, the binding-posts E F, and
means for rotating the cylinder or armature, means for rotating the cylinder or armature, 15
substantially as herein shown and described. substantially as herein shown and described.
4. In a dynamo-electric machine, the combi A, FLOYD DEAEIELD.
nation, with the field-magnet A, having a cy Witnesses:
lindrical head, B, the standards D, and the OSCAR. F. GUNZ,
?o core C, journaled in the said standards, and C. SEDGWICK.