An Improved Method and Apparatus for Electrical Propulsion of Vehicles.
Year: 1892

page_text: Date of Application, 16th Sept., 1892
Complete Specification Left, 16th June, 1893-Accepted, 12th Aug., 1893
PROVISIONAL SPECIFICATION.
An Improved Method and Apparatus for Electrical Propulsion of
Vehicles.
I, FRANCIS EDWARD ELMORE of Thwaite Gate, Leeds in the County of
York, Electrometallurgist, do hereby declare the nature of this invention to be as
follows:-
In my Specification No. 13492 of 1891 I have described a method and apparatus
for electrical propulsion of vehicles by the alternate attraction and repulsion
between electro magnets carried on the vehicle and laterally projecting poles of
stationary iron bars over which the electromagnets pass, these bars being
magnetised by induction from a magnet carried on the vehicle. My present inven-
tion relates to an improved arrangement of this kind, adapted for two alternating
electric currents in quadrature.
The
According to my present invention I fix on the track under the vehicle two sets,
each set consisting of a pair of toothed iron bars, each tooth constituting a pole of
the one bar of a pair projecting into the space between each two teeth or poles of
the other bar of the same pair. On the vehicle I mount, one over each pair
of bars, two magnetising bobbins supplied with alternating currents in quadrature,
that is to say the one current differing in phase from the other by one quarter of a
wave length. Each of these bobbins is transverse to the track, extending across a
pair of the iron bars and giving, as it passes each portion of the one bar of the pair,
polarity opposite to that given to the corresponding portion of its fellow bar.
vehicle also carries two propelling electro-magnets one for each pair of bars, having
their coils joined together forming a closed circuit. Each of these magnets has its
poles in a line parallel to the track, the poles being at such distance apart that
when the one pole is immediately over a tooth of the one bar, the other pole is over
a tooth of the other bar of the pair. These two propelling magnets are so situated
on the vehicle that while the one thus has its poles over two teeth of the one pair
of bars, the other has its poles over the spaces on each side of a tooth of the other
pair of bars. The apparatus operates in the following manner.
The bars being magnetised by induction from the magnetising bobbins, so that a
tooth of the one bar of each pair constitutes a pole opposite to the pole constituted
by the adjacent tooth of its fellow bar, the one of the propelling bobbins which is
passing over these teeth is magnetised by induction from them, and the current
thus set up in its coil passes through the coil of the other bobbin magnetising its
core, so that its one pule is attracted by the tooth of the bar towards which it is
advancing, and its other pole is repelled by the tooth from which it is retreating.
The vehicle is thus propelled over the gauge of a tooth, and, the two propelling
bobbins then alternating their action, it is again propelled over the gauge of a
tooth, and so on continuously.
The vehicle may carry several sets of bobbins both for magnetising and for
propelling.
Dated this 16th day of September 1892.
ABEL & IMKAI,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
An Improved Method and Apparatus for Electrical Propulsion of
Vehicles.
I, FRANCIS EDWARD ELMORE of Thwaite Gate, Leeds in the County of
York Electrometallurgist, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement :-
In the Specification to my Patent No. 13492 of 1891 I have described a method
and apparatus for electrical propulsion of vehicles by the alternate attraction and
repulsion between electro magnets carried on the vehicle and laterally projecting
poles of stationary iron bars over which the electro magnets pass, these bars being
magnetised by induction from a magnet carried on the vehicle. My present inven-
tion relates to an improved arrangement of this kind, adapted for two alternating
electric currents in quadrature.
According to my present invention, I arrange the apparatus as shewn diagram-
matically by the accompanying drawing.
Fig. 1 is a longitudinal section.
Figs. 2 and 3 are half sections respectively on X X and Y Y of Fig. 4 which is
a plan.
I fix on the track under the vehicle two sets, each set consisting of a pair of
toothed iron bars A. B and A¹ B¹, each tooth, constituting a pole of the one bar of
a pair, projecting into the space between each two teeth or poles of the other bar
of the same pair.
On the vehicle I mount, one over each pair of bars, two
magnetising bobbins M M¹ supplied with alternating currents in quadrature, that
is to say, the one current differing in phase from the other by one quarter of a wave
length. Each of these bobbins M M is transverse to the track, extending across a
pair of the iron bars, M over A, and B, and M' over A' and B₁, and giving, as it
passes each portion of the one bar A or A¹ of the pair, polarity opposite to that
given to the corresponding portion of its fellow bar B or B.
The vehicle also carries two propelling electro-magnets P P1 one for each pair
of bars, having their coils joined together forming a closed circuit. Each of these
magnets has its poles in a line parallel to the track, the poles being at such distance
apart that when the one pole is immediately over a tooth of the one bar A or A',
the other pole is over a tooth of the other bar B or B' of the pair.
These two propelling magnets P P¹ are so situated on the vehicle that while the
one thus has its poles over two teeth of the one pair A¹ B¹ of bars, the other has
its poles over the spaces on each side of a tooth of the other pair of bars A. B. The
apparatus operates in the following manner.
The bars being magnetised by induction from the magnetising bobbins M M¹ so
that a tooth of the one bar A or A' of each pair constitutes a pole opposite to the
pole constituted by the adjacent tooth of its fellow bar B or B', the one of the pro-
pelling bobbins P which is passing over these teeth is magnetised by induction
from them, and the current thus set up in its coil passes through the coil of the
other bobbin P magnetising its core, so that its one pole is attracted by the tooth
of the bar towards which it is advancing, and its other pole is repelled by the tooth
from which it is retreating. The vehicle is thus propelled over the gauge of a
tooth, and, the two propelling bobbins P PI then alternating their action, it is again
propelled over the gauge of a tooth, and so on continuously.
The vehicle may carry several sets of bobbins both for magnetising and for
propelling. As shewn in the drawings, there are two sets P P¹ and p p' for
propelling.

page_text: 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 :
1. The herein described method of electrically propelling a vehicle by
magnetising two pairs of toothed bars by the passage over them of two bobbins
supplied with electrical currents in quadrature, inducing from these bars currents in
the coils of propelling bobbins in closed circuit with each other, and thus exciting
alternately the propelling bobbins, causing them to be attracted and repelled by the
teeth of the bars over which they pass, and thus to give propulsion to the vehicle
on which all the bobbins are carried.
2. For electrical propulsion of a vehicle in the manner above referred to, in
combination with two pairs of stationary toothed iron bars a vehicle carrying a
pair or several pairs of magnetising bobbins, and a pair or several pairs of propelling
bobbins, arranged and operating substantially as described.
Dated this 15th day of June 1893
ABEL & IMRAY,
Agents for the Applicant.