Improvements in Electric Motors and Dynamos.
Year: 1896

page_text: Date of Application, 18th Apr., 1896
Complete Specification Left. 13th Jan.. 1897-Accepted. 6th Mar.. 1897
Improvements in Electric Motors and Dynamos.
I, WILLIAM EDWARD GRAY of 17 Roman Road Barnsbury London, N.
Electrician do hereby declare the nature of this invention to be as follows:-
The armature and the field are provided with solenoid bobbins, the number of
which in the armature is always either more or less than that in the field. The
pole extremities of the armature during its revolution pass actually through the
extremities of the field instead of passing across the faces or extremities of each
other, and for this purpose the pole pieces of the armature and of the field magnet
bobbins are at each end extended radially outward and inward respectively towards
and beyond each other but made of a divided tongued or laminated form so that
the tongues of one are capable of engaging with or between the tongues of the
other. The circuits are so arranged that during every revolution of the armature
the tongues at the ends of each armature bobbin core while successively engaging
with the tougues of each field bobbin core will produce a number of pulls equal
to the number of bobbins in the armature say for instance four multiplied by the
number of bobbins in the field say for instance five and these twenty pulls will by
reason of the multiple laminated form of the pole pieces be of increased magnitude.
The construction of such a motor is of especial value for traction purposes owing
to its light and powerful character.
Dated this 18th day of April 1896
JENSEN & SON,
77 Chancery Lane, London, W.C., Patent Agents.
1, WILLIAM EDWARD GRAY of 17 Roman Road, Barnsbury, London, N.
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 :-
This invention consists in providing the pole pieces of the armature and of the
field magnet at each end with respectively outward and inward extensions of such
a divided, tongued or laminated form that the tongues of the armature poles during
the rotation of the armature pass between the tongues of the field magnet poles,
instead of the poles, as ordinarily, passing across the faces or extremities of each
other.
Fig. 1 of the accompanying drawings shows as an illustration the invention
applied to a hobbin A of an armature and a bobbin B of a field magnet. The
armature bobbin has laminated pole extensions C which extend to varying distances
and then bend outwardly. The field maguet bobbin has similar pole extensions D
which extend to correspondingly varying distances and then bend inwardly. The

page_text: laminated extensions of one pass between the laminated extensions of the other as
-shown.
Fig. 2 is an end view of a so called Lugs dynamo or motor having my invention
applied thereto. In this case as an example the number of bobbins in the field
magnet is seven, and the number of bobbins in the armature is eight. In this case
the number of pulls exerted by the armature bobbins during one revolution will
be 8 x 756 and these pulls will by reason of the multiple laminated form of the
pole pieces be of increased magnitude.
The construction of such a motor is of special value for traction purposes owing
to its light and powerful character.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what. I
-claim is :-
Providing the pole pieces of the armature and of the field magnet in a dynamo
or electro motor at each end with respectively outward and inward extensions of
such a divided tongued or laminated form that the tongues of the armature during
the rotation pass-between the tongues of the field magnet substantially as described
and shown.
Dated this 13th day of January 1897.
JENSEN & SON,
77 Chancery Lane, London, W.C., Patent Agents.