Improvements in Electric Motor Engines.
Year: 1897

page_text: Date of Application, 14th Oct., 1897
Complete Specification Left, 14th July, 1893-Accepted, 10th Sept., 1898
PROVISIONAL SPECIFICATION.
Improvements in Electric Motor Engines.
I, CECIL BURMAN CALLOW, of St. Helen's Isle of Wight, Electrical Engineer,
do hereby declare the nature of this invention to be as follows:-
.
According to this invention two motors are combined in one motor with double
windings each armature winding having its own commutator and brush gear and
each field winding its own separate terminals. The ends of each armature wind-
ing and of each field winding are connected up to separate contact plates of a
controller switch. The controller switch has also two other contact plates coupled
to the lines leading from the electrical supply say from an accumulator.
By the controller switch the contact plates can be coupled one with another in
such manner as to place the two motor windings in parallel and each armature
winding in series with its own field winding so obtaining full speed or can be
coupled in such manner as to place all the windings in series thus doubling the
resistance of the motor without the use of any artificial resistances whatever and
thereby obtaining a half speed.
An intermediate speed may be obtained by putting the fields in series and
armatures in parallel.
The diagram Figure 1 shews the connections as for two series wound
a controller switch formed in
motors coupled to the contact plates of
motors are shown
in order to simplify and better explain the connections but in my invention
these windings are side by side on the same field magnets and armature
respectively.
the above manner, it being understood that two
A, B, A2, B2 are armature circuits coupled to contact plates 3, 4, 7, 8.
a¹, b¹, a², b³ are field winding circuits coupled to contact plates 2, 5, 6, 9.
Z is an accumulator with conductors passing therefrom to contact plates 1
and 10.
The diagram Figure 2 shews the connections required for half speed ahead
or forward driving.
The diagram Figure 3 shews the connections required for full speed ahead-
connections for astern or backward driving are the same except that current is
reversed in the fields.
i
100
4000
Dated this 14th day of October 1857.
COMPLETE SPECIFICATION.
C. B. CALLOW.

page_text: be performed to be particularly described and ascertained in and by the following
statement:
-
According to this invention two motors are combined in one motor with double
windings each armature winding having its own commutator and brush gear and
each field winding its own separate terminals. The ends of each armature wind-
ing and of each field winding are connected up to separate contact plates of a
controller switch. The controller switch has also two other contact plates coupled
to the lines leading from the electrical supply say from an accumulator.
By the controller switch the contact plates can be coupled one with another in
such manner as to place the two motor windings in parallel and each armature
winding in series with its own field winding so obtaining full speed or can be
coupled in such manner as to place all the windings in series thus doubling the
resistance of the motor without the use of any artificial resistances whatever and
thereby obtaining a half speed.
An intermediate speed may be obtained by putting the fields in series and
armatures in parallel.
The diagram Figure 1 lodged with my Provisional Specification shews the con-
nections as for two series wound motors coupled to the contact plates of a controller
switch formed in the above manner it being understood that two motors are shown
in order to simplify and better explain the connections but in my invention
these windings are side by side on the same field magnets and armature
respectively.
A, B, A2, B2 are armature circuits coupled to contact plates 3, 4, 7, 8.
a, b, a2, b2 are field winding circuits coupled to contact plates 2, 5, 6, 9.
Z is an accumulator with conductors passing therefrom to contact plates 1
and 10.
The diagram Figure 2 shows the connections required for half speed ahead
or forward driving.
The diagram Figure 3 shows the connections required for full speed ahead,
connections for astern or backward driving are the same except that current is
reversed in the fields.
Thus if the motor be supplied with current from an accumulator or battery all
cells will be used uniformly the whole of the cells being always in use at whatever
speed the motor is being driven in place of as is usual employing a greater or less
number of battery cells according to the speed required.
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. An electric motor engine having double field and armature windings con-
nected up with a commutator whereby the field windings can be placed in parallel.
and the armature windings in series each with its own field windings or all the
windings be placed in series substantially as described.
2. An electric motor having its windings and commutator arranged substan-
tially as herein before described and illustrated in the drawing annexed.
Dated this 13th day of July 1898.