Improvements in or relating to the Connecting of an Accumulator Battery in Alternating Current Circuit.
Year: 1889

page_text: COMPLETE SPECIFICATION.
Improvements in or relating to the Connecting of an Accumulator
Battery in Alternating Current Circuit.
A communication from AUGUST FOEPPL, Doctor Phil., Engineer and Head-teacher
at the Technical Town College in Leipzig, in the Empire of Germany.
I, ALFRED JULIUS BOULT of 323 High Holborn in the County of Middlesex,
M I.M.E., 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 :-
This arrangement has for its object to form a connection between an accumulator
battery a and cables b and c of an alternating current circuit which permits, on the
one hand, the charging of the battery by the alternating current and the maintenance,
by means of the battery, of the alternating current in the main circuit, whenever the
E M F of the alternating current dynamo decreases or stops altogether. The battery,
therefore, is in relation to the alternating current motor connected at any given
moment in parallel, and bears the same relation to the alternating current installation
as that of a battery connected in parallel to a direct current arrangement.
This object is attained by an arrangement of accumulators consisting of two
main divisions.
One of these main divisions consists of a stationary cylindrical commutator d, the
segments e of which, insulated from each other, are connected by wires with various
points of the battery. In the accompanying drawing these points of the battery and
the corresponding segments are marked by the same figures. Independently of the
end electrodes, 1 and 9, of the battery, each point of the latter is connected with at
least two segments of the commutator d. The choice of the parts of the battery
that should thus be connected with the commutator depends on the current curve of
the alternate current. Between each pair if such points of connection, at least one
accumulator cell is inserted, though more than one such cell may, if required, be
arranged in each interval. The other main portion of this arrangement is a brush
carrier ff. It is keyed on to shaft g driven at the desired speed either by the
main shaft of the dynamo in the ordinary way or by means of a small alternate
current motor. It carries two brushes h situated almost diametrically opposite each
On the same
other, which are in contact with the stationary commutator segments e.
shaft there are two metal plates i and k insulated from each other, each of which is
electrically connected with a brush h, and placed in contact with either cable of the
main circuit by means of two stationary brushes and m.
While in all the remaining parts the construction does not materially differ from
that generally known, and the combination and formation of circuits are alone
claimed as new, this does not apply to the commutator brushes h h, which have to
be arranged in a peculiar manner to answer the desired purpose. For, in order to
obviate, on the one hand, the consequences of short circuiting in some of the cells
during the passage from one segment to the next, and to equalize on the other hand
the variations of the current-curve likely to occur in such passages, each commutator
brush his formed of two separate brushes h¹ and h² so arranged that both points of
a small are which is some-
contact n and o are separated in relation to each other by
what larger, however, than that of the insulating strip p between two segments.
One half of the brush h' is thus set at a slight angle in relation to the other half h².
Between the ends q and r of the brushes farthest from the commutator, a coils of
thick copper wire is inserted, into the centre of which an iron core t may be fitted.
It is from the centre of this wire-coils that the outward leading conductor u starts.
The electro-motive forces induced in the convolutions of the coil, during the
passages, prevent the troublesome consequences of short circuiting from taking place,
and reduce fluctuations.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed as communicated to me
by my foreign correspondents I declare that what I claim is ;-
1. The employment of a commutator such as d the segments of which e are
connected with separate or single points between the cells or elements of an
accumulator-battery for the purpose of effecting a connection in parallel of the
accumulator battery a in an alternating current circuit b and c.
2. The construction of the accumulator brushes necessary for this purpose of two
portions such as h' and h² inclined towards one another at a small angle, which
two portions are connected at their outer ends by a coil or bobbin s from the
centre of which the outward leading conductor u starts substantially as described and
illustrated in the accompanying drawings.
3. The application of the arrangement described above for the purpose of regu-
lating the current in an alternating current circuit or in an alternating current
dynamo or motor connected therewith, and also its application for the purpose of
charging a primary alternating current into a direct current.
ليمو
T
1000
W. P. THOMPSON & BOULT,
Agents for the Applicant.
W. P. THOMPSON & BOULT,
Agents for the Applicant.