Improvements in the Method of Winding Armatures for Multipolar Continuous Current Dynamo Electric Machines and Electro Motors.
Year: 1896

page_text: Date of Application, 8th July, 1896-Accepted, 15th Aug., 1896
COMPLETE SPECIFICATION.
Improvements in the Method of Winding Armatures for Multipolar
Continuous Current Dynamo Electric Machines and Electro
Motors.
We, FREDERICK HENRY ROYCE, and ERNEST ALEXANDER CLAREMONT,
both of Cooke Street, Hulme, Manchester, in the County of Lancaster,
Manufacturing Electricians, 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 the method of winding armatures for multipolar
continuous current dynamo electric machines and electro motors.
In the accompanying drawing
Fig. 1 represents the usual series method of connecting armature bars with cross
connected commutators.
Fig. 2 represents the method of parrallel winding usually employed.
Fig. 3 represents our improved method of winding according to this invention
and as hereinafter described.
The objects of this invention are to arrange the conductors in such a manner
that commutation will take place on two bars only at a time, but with the same
results as when four bars are commutated simultaneously, to reduce the tendency
to spark, to avoid the necessity of employing cross connections as is represented in
Fig. 1 with the attendant complications in armatures of many sections, and to
retain the advantages of parallel winding as represented in Fig. 2 but with a
reduced number of bars.
In the ordinary four pole multipolar machine shown in Fig. 1 the armature bars
are connected to give their electro motive force in series which necessitates the
commutator to be cross connected and at least four of the armature bars to be
commutated simultaneously.
Nos. 1 to 12 are armature bars and 1" to 6" are commutator bars: The complete
armature circuit is formed by connecting
No. 12 to 3
No. 11 to 2
2,5
وو
No. 1 to 4
39
4 " 7
"
7 10
"
"
6
3,6
9
5 8
"
"
"
وو
10
"
» 12, 6ª and 3ª
9
"
,, 11, 5ª and 2ª
8
4ª.
"
"
6 and 5 are commutator bars.
4ª is a commutator bar connected to 1ª which is
also a commutator bar and connected to No. 1 armature,bar.
The cross connections on commutator are
Nos. 1 to No. 4
2ª
5º
99
"
23
3a
6"
"
"
"
The current is taken from the commutator by the brushes d' d' d and dby
which d¹ and are equal notential forming say a negative connection, and,d

page_text: for cross connections on the commutator is avoided and the tendency of inducing
sparking is greatly reduced. The current is taken from the brushes in the usual
manner, d' and d being either positive or negative and d and d being also
positive or negative, but the current comes alternately from d' or d³ according to
the position of the commutator plate under the brush and the same with d and d..
In the drawing d is shown as taking the current and d³ in the act of passing over
the insulation between 5 and 6.
In lieu of bar winding as herein before described, coils of many turns may be
employed, each coil taking the place of a pair of bars such as are shown connected
together.
Having now particularly described and ascertained the nature of this our said
invention and in what manner the same is to be performed we declare that what
we claim is :-
1st. In armatures for multipolar continuous current dynamo electric machines
and electro motors, the method of winding by employing any suitable number of
bars or sections, said number being such that it is not divisible into equal fractions
by the numeral representing the number of poles employed in combination there-
with and connected so as to give the electro motive force of the whole number
although commutated in pairs of bars, the brushes being arranged to give the
whole or part of the current intermittently in the manner substantially as herein-
after described.
2nd. The method of winding which comprises such numbers of bars or coils and
commutator bars that although connected the whole number in series admits of
commutation between the said bars in pairs or individual coils.
Dated this 7th day of July 1896.
THOMAS PRESCOTT,
53 Arcade Chambers, St. Mary's Gate, Manchester,
Agent for Applicants.