Improvement in Dynamo-electric Machines.
Year: 1897

page_text: Date of Application, 10th July, 1897
Complete Specification Left 12th Apr 1898 Accented 25th June 1898
PROVISIONAL SPECIFICATION.
Improvement in Dynamo-electric Machines.
GEORGE CHIEFFEY-JAMES, 25, Thoresby Road, Hillsbro', Sheffield, Electrician, and
HARRY PERCY WARD, 25, The Nook, Barber Road, Sheffield, Electrician, do hereby
declare the nature of this invention to be as follows:
-
The coils, which excite the magnetic field, envelope, in a more or less degree as
desired, the armature, the magnetic parts of which become magnetised by the
direct action of the current in these coils, as well as by the induction of the magnetic
poles, which are also produced by the magnetising action of the coils previously
mentioned, at certain positions in the body completing the magnetic circuit.
The exciting coils are arranged to produce the greatest possible direct magnetising
effect on the armature, and at the same time, to prevent distortion of the field.
The magnetic circuit is coincident with the flow of the lines-of-force due to the
current in the exciting coils, the magnetic reluctance thus being greatly reduced
and non-efficient interaction eliminated.
Our invention applies to multipolar as well as bipolar machines, and also may be
applied to existing dynamo-electric machines, in which the field is excited by coils
wound on field magnets, but the coils of such machines do not exercise any direct
magnetising effect on the armature.
This description applies to our invention when viewed as a dynamo but, by the
ordinary method of conversion, the machine can be worked as a motor.
This invention also applies to motor-generators.
CHEFFEY-JAMES.
GEORGE
HARRY PERCY WARD.
Improvement in Dynamo-electric machines.
GEORGE CHEFFEY-JAMES, 39 (late of 25), Thoresby Road, Hillsbro', Sheffield,
Electrician, and HARRY PERCY WARD, 25, The Nook, Barber Road, Sheffield,
Electrician, 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:-
-
Our invention relates to electric dynamos, motors and motor-generators.
The object of our invention is to attain greater efficiency in dynamo-electric

page_text: machines by producing more direct and powerful magnetic effect on the armature
and by reducing the magnetic reluctance of the magnetic circuit.
Fig. 1 is a front elevation with part cut away in section.
Fig. 2 is a vertical section along the line
Q.
Fig. 3 is a front elevation with part cut away in section.
Fig. 4 is a vertical section along the line OQ with armatures in elevation.
Fig. 5 is a front elevation with part cut away in section.
First. Fig. 1 shows our invention as a dynamo and motor, and the following
description applies to it when viewed as a dynamo.
The coils A, generating the magnetic field, are wound on suitable bobbins or
frames F so as to enclose the armature, and these coils A are themselves enclosed by
the fixed magnetic parts or field-magnets B which are continued or extended at the
sides so as to make the machine armour-clad.
By this arrangement the coils exert a direct magnetic effect on the armature as
well as on the field-magnets and the positions of these magnetic parts B are such,
in relation to the exciting coils A, that they are coincident with the flow of the
magnetic lines of force due to the magnetising effect of a current in the coils A.
We regard the magnetic core B of the armature as a rotating part of the field-
magnets or magnetic circuit. This rotating part carries coils C, commonly known
as armature coils, in which currents are induced when the armature is rotated in
the magnetic field by mechanical means.
The coils C are put in contact with the brushes E by means of a suitable commu-
tator D, in the ordinary manner.
Second. When used as a motor the arrangement of the parts is precisely similar,
but a different lead is given to the brushes and a current of electricity is supplied
to the machine. This corresponds to the ordinary method of conversion.
Third. Our invention may be used as a four-pole or multipolar dynamo and
motor.
This form of machine is produced by dividing the exciting coils A (Fig. 3) into
as many sections as the machine has poles, each section being wound on a separate
frame and enclosing its own fractional part of the armature.
Thus in a four-pole machine there would be four coils A and each coil would exert
a magnetic influence on one-fourth of the armature approximately; a similar
relation applies to the effects of these coils on the fixed field-magnets B. These
coils, or sectional-coils, may be connected in series or multiple as desired.
Fourth. By providing two armatures as in Fig. 4, one to act as a motor armature
and the other as a dynamo armature, a motor-generator is formed having the
advantages and attributes of our invention as previously described.
MODIFICATION.
The direct magnetic effect on the armature, as before described may be applied
to existing dynamo-electric machines by continuing the field-magnet coils, wound
on a suitable frame or bobbin F so as to enclose the armature as in Fig. 5. The
exciting coils A, in all cases, may be simple or compound wound, and may be con-
nected in series with, or as a shunt to, the armature coils.
Having now particularly described and ascertained the nature of our said in-
vention, and in what manner the same is to be performed, we declare that what
we claim is: -
1. An improved two, four, or multipolar electric dynamo and motor in which
the exciting coils exert a direct magnetic influence on the armature and in which
the magnetic parts are coincident with the flow of the magnetic lines of force due
to the exciting coils.
2. An improved two, four or multipolar electric transformer in which the ex-
citing coils exert a direct magnetic influence on the armatures, and in which the
magnetic parts are coincident with the flow of the magnetic lines of force due to
the exciting coils.

page_text: 3. An improvement applicable to existing forms of dynamo-electric machines
by coils exerting a direct magnetic influence on the armature as herein described.
Dated this 8th day of April 1898.
GEORGE CHEFFEY-JAMES.
HARRY PERCY WARD.