Improvements in Dynamo-electric Generators and Motors.
Year: 1897

page_text: Date of Application, 15th Jan., 1897-Accepted, 17th Apr., 1897
COMPLETE SPECIFICATION.
Improvements in Dynamo-electric Generators and Motors.
We ERNEST KILBURN SCOTT and ANTHONY GEORGE NEW of Palace
Chambers Westminster Electrical Engineers 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 :-
The object of the present invention is a special form of motor which may
likewise be employed as a dynamo and motor converter, and possesses the
advantage of enabling the moving parts to run with much less friction than is
produced in the ordinary types of dynamo and motor at present in use while
the field magnets and in consequence the whole machine can be made considerably
lighter without any sacrifice of efficiency.
To effect these objects I construct the field magnets of sheets of soft and
preferably wrought iron of different lengths bent over at the poles and bolted or
otherwise suitably secured together in such a manner as to form a laminated field
maguet the laminations of which are at right angles to those of the core of the
armature. The centre of the armature of the motor which is arranged vertically
is slightly below the centre of the magnetic field in consequence, whereof the pull
exercised upon it by the field magnets tends to raise it off its lower bearing and so
counteracting in whole or in part the influence of gravity, reduces the pressure
upon that bearing and consequently the friction to a minimum.
In order that the nature of my invention may be the more readily understood
I refer to the accompanying sheets of drawings in which :-
Figure 1 represents a vertical section through the motor.
Figure 2 a top view and partial section through the line a. n. y. and
Figure 3 a section through either of the lines A B.
The metal web or frame W W which likewise forms a casing and support for
the bearings of the machine is partially surrounded by, while at the same time
supporting the bent soft iron plates pp. These latter are bent round so as to form
the poles of the magnetic field at P P. The windings of the field are shown in
section at S S.
Figure 3 which is a section through either of the lines A B shows the manner
in which the iron sheets forming the core of the field magnets are secured in
position namely by a bent piece which bent twice at right angles passes under-
neath and rigidly secures them to the frame or web W by the bolts t t. Conical
rollers form the lower bearing of the armature a while the upper end of the
armature shaft terminating at e runs in a bearing which may have a graphite bush
and therefore not require oil for lubrication. In the drawing this bearing is
arranged for lubrication by the oil holes 6 the oil then passes through the holes dd
to the bottom bearing rollers r r and then passes into the gear box fand away.
The building up of a field laminated at right angles to the laminations of the
armature in this manner places great magnetic reluctance in the cross magnetic
field produced by the armature currents with the result that the air gap may be
greatly diminished enabling the field magnets to be constructed with much less iron
and less turns in the field coils. The weight of the whole machine in consequence
is greatly diminished, while the necessary lead for the brushes may be reduced
almost to zero.

page_text: Having now particularly ascertained and described the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is―
In an electric generator, motor, or motors converter.
1. The arrangement of the armature vertically with its centre slightly below the
centre of the magnetic field so that the upward pull exercised upon it by the field
lifts or tends to lift it off its lower bearing with the result that running friction is
reduced to a minimum.
2. The employment of field-magnet cores laminated in a plane at right angles to
the laminations of the. armature with the object and for the purposes set forth
substantially as shown and described.
נית
ERNEST KILBURN SCOTT.
ANTHONY G. NEW.