Improvements in Electric Generators and Motors.
Year: 1888

page_text: Date of Application, 8th Dec; 1888
Complete Specification Left, 14th Sept., 1889-Accepted, 26th Oct., 1889
PROVISIONAL SPECIFICATION.
[Communicated from abroad by ALFRED MILES TAYLOR, at present in Baroda, India,
Electrical Engineer.]
Improvements in Electric Generators and Motors.
We, SIEMENS BROS. & Co. Limited, of 12 Queen Anne's Gate, Westminster, in the
County of Middlesex, do hereby declare the nature of this invention to be as
follows:-
This invention relates to the construction and arrangement of a dynamo-electric
machine which when worked by mechanical power produces alternating electrical
currents, or which when supplied with alternating currents works as a motor.
We provide two iron rings preferably made up of iron wire or of laminated iron,
each wound like a Pacinotti or Gramme ring, with an equal even number of coils of
insulated conducting wire such for instance as 16 coils. The one ring is so much
smaller than the other that with its coils it can freely revolve within the outer ring.
On the axis of the inner ring is fixed a commutator having on its periphery a
number of insulated plates suited to the number of coils, to which plates the ends of
the coil wires are connected in such manner that the plates are alternately + and
The commutator also has on it a + and a insulated ring the one connected to all
the plates and the other to all the plates. On the plates of the commutator
bear a pair of brushes insulated from each other placed side by side and of such
length or in such position that while one of them is in contact with a plate, the
other is in contact with the next plate in order. There are also two brushes one
bearing on the + ring and one on the ring.
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When the machine is used as a motor the two conductors by which alternating
currents are led to and from it are provided with double switches by which they can
be connected to the two ring brushes for starting the machine, or, after the machine
is started, to the two plate brushes which brushes are permanently connected to the
two terminals of the coils of the outer ring these coils being connected in series.
When the inner ring is driven by mechanical power, alternating currents are
produced by it.
Dad thol 1 of non 1000
ABEL & IMRAY,
Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in Electric Generators and Motors.
We, SIEMENS BROS. & Co. Limited of 12 Queen Anne's Gate, Westminster in the
County of Middlesex 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 invention relates to the construction and arrangement of a dynamo electric
machine which when worked by mechanical power produces alternating electrical
currents, or which when supplied with alternating currents works as a motor.
We provide two iron rings preferably made up of iron wire or of laminated iron,
each wound like a Pacinotti or Gramme ring with an equal even number of coils of
insulated conducting wire such for instance as 16 coils. The one ring is so much
smaller than the other that with its coils it can freely revolve within the outer ring.
On the axis of the inner ring is fixed a commutator having on its periphery a number
of insulated plates suited to the number of coils, to which plates the ends of the coil
wires are connected in such manner that the plates are alternately + and The
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page_text: -
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commutator also has on it a + and a insulated ring the one connected to all the
+ plates and the other to all the plates. On the plates of the commutator bear
a pair of brushes insulated from each other placed side by side and of such length
or in such position that while one of them is in contact with a plate, the other is in
contact with the next plate in order. There are also two brushes one bearing on
the ring and one on the ring.
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When the machine is used as a motor the two conductors by which alternating
currents are led to and from it are provided with double switches by which they
can be connected to the two ring brushes for starting the machine or after the
machine is started, to the two plate brushes which brushes are permanently connected
to the two terminals of the coils of the outer ring these coils being connected in
series.
"
When the inner ring is driven by mechanical power alternating currents are
produced by it.
Fig. 1 of the accompanying drawings is a side view shewing part of the circum-
ference of a machine according to this invention it being understood that what is
shewn in Fig. is repeated throughout the whole circumference, Fig. 2 is a part
section on the line Z Z and Fig. 3 is a side view of the commutator and collecting
rings. On the shaft or axis A are fixed two side frames B having at equal intervals
an even number of outwardly projecting arms T through which pass insulated bolts I,
K binding the two side frames B against a laminated ring H consisting of iron wire
or hoop. On this ring H between each pair of the arms T is wound a coil () of
insulated wire.
The ring H with its coils constitutes the field magnets which in this case revolve.
Two stationary side frames F have inwardly projecting arms S corresponding in
number to the arms T, and tlirough these frames pass insulated bolts L M which bind
the two side frames F against a laminated ring G also consisting of iron wire or
hoop. On the ring G between each pair of the arms S is wound a coil D of insulated
wire.
The ring G with its coils D constitute the armature which in this case is
stationary.
On the bolt K are strung side by side a number of thin soft iron washers P, of
such width as to fill up the outer space between each two adjacent coils (, and on
the bolt M are strung in like manner washers Q; all the washers P and Q have
circularly curved edges so that as the field magnets revolve the washers P pass very
near to the washers Q but without touching them. On the shaft A is fixed a commu-
tator of ordinary construction having its plates connected to the wires of the coils (
And there are also fixed insulated on the shafts two rings R R¹ which are respectively
connected to alternate plates of the commutator that is to say R' being connected
to plates 1, 3, 5 &c., R¹ is connected to plates 2, 4, 6 &c.
The commutator as usual, has two brushes, and each of the rings R, R¹ has a
brush. These 4 brushes are connected to 4 terminals which may be connected in
pairs to the main leads in various ways according as the machine is intended
to be used as a generator or as a motor with currents of constant or of alternating
direction.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed we declare that what we
claim is:-
An electric generator or motor constructed and arranged substantially as described
with reference to the accompanying drawings.
בד
ABEL & IMRAY,
Agents for the Applicants.