Improvements in Electromotors.
Year: 1898

page_text: Date of Application, 20th Apr., 1898
AQU
1000
1000
PROVISIONAL SPECIFICATION.
Improvements in Electromotors.
We, JAMES THOMAS ROBSON, of No. 5, Duff Street, Poplar, in the County of
Middlesex, Engineer, CHARLES HENRY MARSDEN, of No. 25, Barclay Road, Leyton-
stone, in the County of Essex, Engineer, and HENRY WILLIAM HEADLAND, of
The Firs, High Road, Leyton, in the County of Essex, Electrical Engineer, do
hereby declare the nature of this invention to be as follows:-
These improvements refer to electromotors in which the armature rotates in
one direction and the casing or frame containing the field magnets rotates in
the opposite direction and both driving. We arrange two such electromotors on
the same shaft or axis and for this purpose the armature of one motor is con-
nected mechanically to the field magnet casing surrounding the armature of the
other. The armature of one motor is fixed on a shaft which passes through a
hollow shaft or sleeve upon which the armature of the other motor is fixed and
the field magnet casing around this latter is by a light hollow cylinder or cylin-
drical open worked framing mechanically connected to the armature of the first
named motor, said framing surrounding the field-magnet casing of the said
motor. Upon the end of the central shaft may be fixed a sprocket wheel for
transmitting the power, and upon the outer end of the sleeve or hollow shaft
may be fixed a spur wheel which gears with a spur wheel upon another shaft
that carries a sprocket wheel for power transmission. Both these sprocket
wheels will thus be rotated in the same direction. By this arrangement the
rotating parts may be made to balance their centrifugal forces at all speeds.
The current may be supplied at the outer end of each motor. By a reverse
arrangement the armature may form the outer parts and the field magnets the
inner.
Dated this Twentieth day of Anril 1898
JENSEN & SON,
77, Chancery Lane, London, W.C.,
Patent Agents.
We, JAMES THOMAS ROBSON, of No. 5, Duff Street. Poplar, in the County of
Middlesex, Engineer, CHARLES HENRY MARSDEN, of 25, Barclay Road, Leyton-
stone, in the County of Essex, Engineer, and HENRY WILLIAM HEADLAND, of
The Firs, High Road, Leyton, in the County of Essex, Electrical Engineer, do
[Price 8d I

page_text: 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:-
These improvements refer to electro-motors in which the armature rotates in
one direction, and the frame or casing containing the field magnets rotates in
the opposite direction and both drive the shaft. We arrange and combine two
such electromotors on the same shaft or axis and for this purpose the armature
of each motor is connected mechanically to the field magnet casing surrounding
the armature of the other. The armature of one motor is fixed on a shaft
which passes through a hollow shaft or sleeve upon which the armature of the
other motor is fixed, and the field magnet casing around this latter is by a light
hollow cylinder or cylindrical openworked framing mechanically connected to
the armature of the first named motor, said framing surrounding the field
magnet casing of the said motor.
The accompanying drawing is a longitudinal section of one form of our com-
bined motor constructed according to this invention wherein the rotating parts
balance each other's centrifugal forces at all speeds. The armature a of one
motor is fixed on a shaft b which passes through a hollow shaft or sleeve c upon
which the armature a¹ of the other motor is keyed, and the field magnet
casing around this latter is keyed to the shaft b. Upon the end of the shaft b is
shewn, as an example, a sprocket wheel e¹ for transmitting the power, and upon
the outer end of the sleeve c or hollow shaft is shewn a spur wheel f which gears
with a spur wheel 7 upon another shaft h that carries a sprocket wheel e for
power transmission. Both these sprocket wheels will thus be rotated in the
same direction and such an arrangement is suitable for instance for driving a
motor car. One end part of the casing has to be made in two halves bolted
together as shewn. The casings d d and d² may be openworked but are by
preference closed dustproof For driving by spurwheel gearing instead of by
sprocket wheels and chains we may fit a spur wheel on one end of the shaft and
another spurwheel on a sleeve at the other end, one such wheel made to gear
with an outside spurwheel and the other with an inside spurwheel. For driving
in opposite directions and in the same axis two screw propellers, the one with
right and the other with left handed pitch, without employing wheel gearing
we omit the wheels efg and c and fit one propeller on the prolonged end of
the shaft and the other propeller on the prolonged end of the sleeve c.
By a reverse arrangement the armatures may form the outer parts and the
field magnets the inner.
The current may be supplied in the manner indicated. The wire i leads
from the battery to the outer end of one motor, and the wire from the outer
end of the other motor back to the battery. On the studs and are carried
four brushes, viz. mm² m² m³ and m³ m³ m³ m² which engage with rings nn¹ n² n³
and nnnn that rotate with the motors. These brushes are insulated from
the studs and from each other. Other brushes u and t and u¹t are fixed to but
insulated from the interior of the field magnet casings and d¹ and connected
by insulated wires to the various parts. The current thus runs from battery
wire into brush m collecting ring n, wire p, field magnets d', wire p¹, ring n¹,
brush m', brush m², ring n², wire g, brush t, brush t¹, wire q¹, ring n³, brush m³,
wire, brush m², ring n4, wire s, brush u, brush u¹, wire w, ring n³, brush m³,
brush me, ring nº, wire v, field magnet d, wire v, ring n', brush m², wire r to
battery.
The two motors are connected in series. But by changing the connection
wires to the brushes of the collecting rings two armatures may be put in series
and two fields in parallel or the two armatures in parallel and the two fields in
series, and the sequence of connections to armature and field magnets may be
either field magnet, armature, field magnet armature, or field magnet armature,
armature, field magnet. By the means described we are enabled to reverse the

page_text: current and the rotary motion of the motor. By the arrangement described the
rotating parts may be made to balance their centrifugal forces at all speeds.
As applied to motor cars the arrangement described and shewn is of great
practical utility, because no differential gear is needed for enabling the motor
car to turn round a corner, inasmuch as the armature of one motor and the field
magnets of the other motor automatically slow down together to the required
speed, while allowing the other armature and field magnets to run together at
their full or required speed.
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:-
1. A combined or double motor consisting of two electromotors mounted on
the same shaft the armature of each motor being mechanically connected with
the set of field magnets of the other motor so as to rotate therewith the two
armatures rotating in opposite directions, and the two sets of field magnets also
rotating in opposite directions, substantially as set forth.
2. A combined or double motor consisting of two electromotors mounted on
the same shaft the armature of one and the set of field magnets of the other
being fixed to the shaft, while the set of field magnets of the former, and the
armature of the other are provided with a sleeve which rotates on and in the
opposite direction to that of the shaft substantially as set forth.
3. The construction of wheel gearing for combined or double motor as
described and as shewn on the drawing.
4. The construction and arrangement of electrical connections for combined
or double motor, as described and as shewn on the drawing.
Dated this Twentieth day of January 1899.
JENSEN & SON,
77, Chancery Lane, London, W.C., Patent Agents.