Improvements in Multi-phase Alternating Current Motors without Separate Excitation.
Year: 1892

page_text: Date of Application, 29th Nov., 1892
Complete Specification Left, 29th Aug., 1893-Accepted, 7th Oct., 1893
PROVISIONAL SPECIFICATION.
Improvements in Multi-phase Alternating Current Motors without
Separate Excitation.
I, CHARLES EUGEN LANCELOT BROWN, of Baden, Switzerland, Engineer, and
Manufacturer, do hereby declare the nature of this invention to be as follows:-
This invention of improvements in multi-phase alternating current motors,
without separate excitation has reference to a motor distinguished by the special
construction of the windings for the inducing and induced portions thereof and also
by improved constructional details as I will now proceed to describe by aid of the
accompanying drawings in which,
Fig. 1 illustrates the improved motor partly in front elevation and partly in
cross section; and
Fig. 2 is a longitudinal section thereof.
Figs. 2 24, 3, 34, 4 and 44 show details of the winding.
Fig. 5 is a diagram of the winding.
The outer winding A which receives the primary current, is stationary. The
iron sheath A' for this winding consists of insulated and laminated sheet metal
pressed between two rings A2 that are cast in one with the two halves of the
framing which are connected together by bolts B and carry the feet on which the
motor rests. CC are two end plates or covers that are provided with bearings C³
and serve to protect the interior of the machine. The end plates or covers are
each provided with a central opening and with openings at the outer periphery_for
promoting a circulation of air from the centre to the outside of the motor. Near
the inner periphery, the iron sheath A¹ is provided with holes A³ of any suitable
shape, preferably of approximately oval shape as shown through which portions of
the wires forming the outer winding A are passed. One half of these wires, for
example the inner half situated nearest the axis of the motor is, on one side bent
back in a definite direction, but in such a manner that they are situated always at
the same distance from the axle, see Figs. 2 and 34 at top. On the other side the
wires of the inner half are either also bent (Fig. 4ª at bottom) or remain straight.
(Fig. 34 at bottom). The wires of the outer half are bent in a direction opposite to
that of the inner half. The ends are soldered together in such a manner as to form
a drum-winding as shown in the diagram (Fig. 5).
By employing this system of winding, perfect symmetry is obtained; the space
occupied is reduced to a minimum, and inspection and repair are facilitated by the
symmetrical arrangement, all crossing being avoided.
The rotary portion of the winding is carried by a sheath D formed of laminated
sheet iron clamped between two rings E that are secured in place upon a core F
by bayonet-joint or other suitable fastenings. The sheet metal plates forming the
sheath D are near their outer periphery formed with holes that are similar to those
in the outer magnetic sheath A and contain a similar winding, G.
For large motors the arrangement of the movable winding G is similar to that
of the stationary one and is placed in connection with rubbing rings, whereby it is
possible to include starting-resistances.
For small motors the movable winding is so arranged that wires in the same
position of the field are short-circuited, in which case the rubbing rings are
dispensed with; or the wires may be connected together by mere short-circuiting

page_text: rings. In all cases however care must be taken to properly insulate the wires
from the iron.
Dated this 29th day of November 1892.
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.Č., Agent for the Applicant.
COMPLETE
SPECIFICATION.
Improvements in Multi-phase Alternating Current Motors without
Separate Excitation.
I, CHARLES EUGEN LANCELOT BROWN, of Baden, Switzerland, Engineer, and
Manufacturer, 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 of improvements in multi-phase alternating current motors,
without separate excitation, has reference to a motor distinguished by the special
construction of the windings for the inducing and induced portions thereof, and
also by improved constructional details, as I will now proceed to describe by aid of:
the drawings filed with my Provisional Specification and in which,
Fig. 1 illustrates the improved motor, partly in front elevation, and partly in
cross section.
Fig. 2 is a longitudinal section of the improved motor.
Figs. 2 24, 3, 3, 4 and 44 show details of the winding.
Fig. 5 is a diagram of the winding.
The outer winding A, which receives the primary current, is stationary. The
iron sheath A¹ for this winding, consists of insulated and laminated sheet metal
pressed between two rings A² cast in one with the two halves of the framing which
are connected together by bolts B and are provided with the feet on which the
motor rests. CC are two end plates or covers that are provided with bearings C¹
and serve to protect the interior of the machine. The end plates or covers Care
each provided with a central opening and with openings at the outer periphery for
promoting a circulation of air from the centre to the outside of the motor. Near
the inner periphery, the iron sheath A' is provided with holes A³ of any suitable
shape, preferably of approximately oval shape, as shown, through which portions of
the wires forming the outer winding A are passed. The projecting or protruding
ends of one half of these wires, for example the inuer half situated nearest the axis
of the motor is, on one side, bent back in a definite direction, but in such a manner.
that they are situated always at the same distance from the axis of the motor, see
Figs. 2, 2 and 34 at top. On the other side the projecting or protruding ends of
the wires of the inner half are either also bent as shown in Fig. 44, at bottom, or
remain straight as shown in Fig. 3A at bottom, but so as to be always at the same
distance from the axis of the motor. The projecting ends of the wires of the outer
half are bent in a direction opposite to that of the inner half, as shown and so as
to be also situated always at the same distance from the axis of the motor. The
adjacent ends of the wires are soldered together in such a manner as to form a
drum-winding. The diagram (Fig. 5) shows an advantageous form of drum-
winding that can be readily constructed by arranging the wires composing the
winding A in the manner hereinbefore described. The said arrangement of the
wires may however be employed in the construction of drum-windings differing
somewhat from that shown in the diagram.
By arranging the said wires in the manner explained, perfect symmetry is
obtained, the space occupied is reduced to a minimum, and inspection and repair
are facilitated by the symmetrical arrangement, all crossing being avoided.
The rotary portion of the winding is carried by a sheath D formed of laminated

page_text: sheet iron clamped between two rings E that are secured in place upon a core F
by bayonet-joint or other suitable fastenings. The sheet metal plates forming the
sheath D are, near their outer periphery, formed with holes that are similar to
those in the outer magnetic sheath A, and contain a similar winding G.
For large motors, the arrangement of the movable winding G is similar to that
of the stationary one, but the ends of such winding are placed in connection with
rubbing rings fixed on but insulated from the shaft. This arrangement enables
resistances to be used in order to avoid too heavy currents when starting.
For small motors the movable induced winding is so arranged that wires in the
same position of the field (as for instance in a bi-polar motor, the diametrically.
arranged wires) are short circuited, in which case the rubbing rings are dispensed
with, or the wires may be connected together by mere short-circuiting rings (see
Figs. 1 and 14). In all cases however, care must be taken to properly insulate the
wires from the iron.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what Į
claim is :-
:―
1. In a multi-phase alternate current motor without separate excitation, the
symmetrically arranged winding of the inducing and induced parts, the projecting
or protruding ends of the wires composing the winding lying within the openings of
the inductor, being bent in such a manner that the distance of the ends of the
wires, composing each half of the winding, from the axis of the motor, is always the
same, substantially as described and shown.
2. In a multi-phase alternate current motor without separate excitation, the
peculiar construction of the frame of such motor, said frame consisting of two
cylindrical parts with rings or crowns A² between which the parts of the iron
core A are held, and with two covers CC provided with bearings and with
apertures for ventilating purposes, substantially as described.
3. The improved multi-phase alternate current motor, without separate excitation,
constructed, substantially as described and shown.
Dated this 29th day of August 1893
W. LLOYD WISE,
Per F. J. Brougham,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.