An Improved Continuous Current Electric Motor Generator.
Year: 1896

page_text: Date of Application, 26th Nov., 1896-Accepted, 26th Nov., 1897
An Improved Continuous Current Electric Motor Generator.
We, MAX BRAB of 11 & 13, Wupperstrasse, Solingen, Merchant, and AUGUST
KNOCHE, of 23A Wupperstrasse, Elberfeld, Gentleman, both in the Empire of
Germany, do Lereby 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 :-
The subject of this invention is a continuous current machine, the main feature of
which is that the windings of both the field magnets and arinatures are double, a
current being fed into the primary winding and a current induced in the secondary
winding, which latter is conducted away by a collector specially provided for the
purpose. The machine is in fact similar to an ordinary electric motor receiving
current to produce rotation of the armature except that the field magnets and
armature are provided with a secondary winding.
In the accompanying drawings one form of the improved machine is represented
by way of example;
Figure 1 being an end elevation, and
Figure 2 a side elevation thereof, and
Figure 3 a diagram of the circuits.
In all the views similar parts are marked with like letters of reference. In these
e and fare respectively the field magnets and armature, and a b and c d the brushes
of two collectors or commutators. In the diagram (Figure 3) the primary and
secondary windings of the field magnets are indicated by the coils e¹ and e²
respectively, and the primary and secondary windings of the armature by the
commutator circles and 2 respectively. e3 and e' are regulating resistances of any
suitable kind for the field magnets.
A current is fed into the primary winding of the machine from any suitable source
not shown in the drawings. This current arrives at the brush b by the wire 1 and
divides at said brush, part passing through the brush into the armature primary
winding and returning by the brush a and circuit 2 and 3 to the source, whilst the
other part passes through 4 to the regulating resistance e and then through 5 to the
primary winding e¹ of the field magnets and returns by 3 to the source. The
armature will thus be rotated in the manner of an ordinary electric motor. A
current is induced in the secondary winding e2 of the field magnets of the machine,
which current flows through the circuit 8, 9, and the regulating resistance e³ and
from thence through 10 and the brush d into the secondary winding f of the
armature and by the brush c and the wire 7 again to e². This current unites in
the armature winding f2 with the current already induced there by the rotation of the
armature, and a very powerful current may be collected off the brushes c and d and
utilized for a great variety of purposes, say, for feeding storage batteries, electric
lamps, electro motors and the like. Motive power may also be taken from the
machine by means of belts applied to the belt pulley which rotates with the
armature.
For the field-magnets, steel cores are preferably used, while the armature may be
formed in the shape of either a "Gramme" ring or a drum.

page_text: The fact which though, perhaps, unlikely at first sight, is none the less true-
that the current, derivable from the machine in the manner stated, represents a
greater number of amperes and volts than that of the current first admitted, may be
accounted for by the exceptionally favourable conditions under which induction takes
place in a machine constructed in accordance with this invention.
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 we
claim is :-
A continuous current machine wherein both the permanent field magnets and the
armatures have double windings which join two collectors in such a manner that
the current, entering one of the collectors and the first winding, generates an induced
current in the second winding; which induced current, upon its delivery by the
second collector, may be made serviceable in the electrical industry for an almost
indefinite variety of purposes.
ROBERT E. PHILLIPS, Assoc. M. Inst. C.E., M.I. Mech. E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Associate Agent.