Year: 1898

page_text: Date of Application, 29th Dec, 1898
Complete Specification Left, 7th Sept., 1899-Accepted, 14th Oct., 1899
I, HENRY LEITNER, of No 207, Piccadilly, in the County of London, Electrical
Engineer, do hereby declare the nature of this invention to be as follows
This invention relates to electric motors particularly adapted for propulsion
of vehicles, and so constructed that they can be safely worked at high speeds,
and that the iron employed in them for magnetic purposes 18 utilised also in
contributing to their strength
The armature 18 of 11ng type outside the field magnets, and either the armature
may be stationary while the magnets rotate or both may 1otate in opposite direc-
tions The motor 18 multipolar, having preferably six poles. The aimature
segments are wound with one layer of we all in the same duection and the
windings are so connected in series, consecutive segments being about the distance
of similar poles apart, that only two brushes are necessary, but, in order to shorten
the commutator, it is preferied to employ three pans of brushes of silver wire
gauze with carbon lamination on both sides, set at right angles to the commutator
The field magnets have six radial poles, three of them only, say the positive
poles having bobbins on them, wound in series and receiving cuilent through
two contact rings. When both the armature and the field magnets revolve,
they are alanged to drive opposite wheels suitably geared to the diving
mechanism
The motor and commutator are enclosed in casings which are preferably of
aluminium and are so made as to give ready access to all the paita, provision
being also made for centrifugal ventilation
When one motor is employed, its speed may be regulated by supplying current
at various voltage and also by varying the strength of the field magnets
When
two motors are employed their field magnets and also their armatures may be
connected in parallel or in series, for controlling and varying speed
T: 0L
L
1000
ABEL & IMRAY,
Agents for the Applicant.
I, HENRY LEITNER, of No 207, Piccadilly, in the County of London, Electrical
Engineer, 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:-
My invention relates to an electric motor constructed as I shall describe
nafarting to the accompantine drawings.

page_text: Fig 1 is a vertical section partly in elevation of a motor according to my
invention Fig. 2 18 a side elevation, part of the left half of the casing being
cut away to shew part of the interior, and Fig 318 a diagram indicating the
connections between the field magnet coils
On a shaft a are fixed the field magnets consisting of non laminae cut so as
to present six poles 6 three of which are coiled with insulated wire e, the alternate
poles having no coils All the laminae are clamped on the shaft between a
collar and a nut e, and prevented from turning by a key f The armature
consists of uon laminae g serrated inside and outside to receive insulated wnes h.
These laminae are bound together by copper livets passing through them and
to the laminae are attached by screws two side frames k, which are connected
together by bolts and which have projecting studs at intervals bearing against
the laminae g.
Both side frames have bosses containing ball bearings which have four rows of
balls m separated by 1ngs n, bearing on the shaft a, and another 10w of balls o
to take end thi ust The side fiame has outside the bearing boss another hollow
boss in which are fixed insulated the commutator segments p On the shaft a
are fixed the brush holders r which are themselves connected to rings s and t,
other rings and are connected by wires led through a bore of the shaft a to
the 1ng d, through lateral holes of which they branch to the coils c
In order to shew how the brushes are connected to both 1ngs s and t, the one
bush is shewn opposite to the other, but it is to be understood that they are
really placed upon the shaft in position determined by the magnet poles
The connections for the armature coils are made in the ordinary manner to
the commutator-segments p and may, obviously, be grouped in many different
ways, and the commutator-brushes are connected by wires to the ing's and t,
while the magnet coils are connected by wires to the rings and v
Obviously the shaft a and magnets may be stationary, while the armature with
its side frames revolves, or the armature and side frames may be stationary while
the shaft and magnets revolve, or both the armature and the magnets may revolve
in opposite directions.
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed, I declare that what I
claim 19
An electric motor comprising field magnets fixed on a shaft, these being made
with an even number of polar extensions wound with coils connected by conduc-
tois carried along a boie of the shaft to ungs fixed on the end of the shaft, a
laminated ring armature surrounding the magnets and held between two side
frames free on beatings on the shaft, the armature coils being connected to
segments of a commutator on one of the side frames, and brushes fixed on the
shaft, and connected to two rings on the shaft, substantially as described
Dated this 7th day of September 1899.