An Improved Device for Steering Electrically Driven Motor Cars.
Year: 1899

page_text: Date of Application, 17th Oct., 1899
12
1000
1011 Aux
4000
PROVISIONAL SPECIFICATION.
An Improved Device for Steering Electrically Driven Motor Cars.
I, ERNST ANDREAS, Ph.D., of 87, Freibergerstrasse, Dresden, in the German
Empire, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention relates to a device for steering motor cars which are driven by
two electro motors. Mechanical devices such as levers or the like are dis-
pensed with and the desired result is obtained by causing the motor armatures
to revolve at different speeds so that the wheels to which they are attached will
revolve at correspondingly different speeds. This is accomplished by varying
the resistance in one or both of the armature circuits.
The accompanying diagrammatic drawing illustrates the arrangement
employed.
The field magnets a, a¹ of one motor are arranged in a series circuit c with
the field magnets b, b' of the other motor. The armatures d, e, are connected in
parallel circuits c, e, in each of which is placed a number of resistances f or g.
The amount of resistance in each circuit is varied by the position of the switch
arm which connects the two circuits. With the arm in the position shown
each circuit has an equal resistance; when it is moved to the left or the right
one or other of the circuits has its resistance increased.
The arm may be so disposed that its movement to the right or left so affects
the motors that the vehicle moves to the right or left accordingly.
W. E. HEYS & SON,
Agents for the Applicant.
An Improved Device for Steering Electrically Driven Motor Cars.
I, ERNST ANDREAS, Ph.D., of 87, Freibergerstrasse, Dresden, in the German
Empire, 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:—
This invention relates to a device for steering motor cars which are driven by
two electro motors, one motor driving a wheel on one side of the car, and the
other motor driving a wheel on the other side. Mechanical devices such as levers
or the like for twisting or turning the wheels are dispensed with, and the desired
result is obtained by causing the motor armatures to revolve at different speeds
PS17

page_text: so that the wheels to which they are attached will revolve at correspondingly
different speeds and thus effect the turning of the car. This is accomplished
by varying the resistance in one or both of the armature circuits.
The accompanying diagrammatic drawing, to which I will' hereinafter refer,
illustrates the arrangement of circuits, resistances and the like which may be
employed in carrying this invention into effect.
The field magnets a a' of one motor are arranged in series in the circuit c with
the field magnets b, b' of the other motor. The armatures d, e, are connected in
parallel circuits c, ² in each of which is placed a number of resistances for g.
The amount of resistance in each circuit is varied by the position of the switch
arm which connects the two circuits and acts as one of the terminals for the
complete motor circuit. Those parts of the armature circuits which contain the
resistances consist each of two parts, a solid part indicated in the solid lines,
and a broken part indicated by the black blocks, the different blocks having
resistance coils interposed between them as indicated at for g.
With the arm h in the position indicated in the diagram each armature
circuit contains an equal resistance and the current is equally divided between
them so that the armatures revolve at equal speeds. When the arm is moved
to the left the resistance in the circuit d is unaltered or is decreased while the
resistance in the circuit of the armature e is increased owing to one or more of
the coils f being included in the circuit. The speed of the armature e is
consequently decreased and the wheel to which it is attached will run more
slowly thus causing the car to turn. Similarly, if the arm h be moved to the
right the speed of the armature d will be decreased relatively to that of the
armature e.
The arm may be so disposed that its movement to the right or left so affects
the motors that the vehicle moves to the right or left accordingly, and, if
desired, to a corresponding angular extent.
The current enters the motor circuit at the point marked +, traverses the
field magnets in series, the armatures in parallel, and leaves through the
arm h.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
1. A steering device for electrically driven motor cars consisting of two electro
motors with the field magnets in series and the armatures in parallel, two series
of resistances one in each armature circuit, and a movable arm or the like,
arranged substantially as herein before described and as illustrated by the accom-
panying drawings.
2. A steering device for electrically driven motor cars, arranged substantially
as hereinbefore described and as illustrated by the accompanying drawings.
Dated this 14th day of July A.1). 1900.
W. E. HEYS & SON,
Agents for the Applicant.