IMPROVEMENTS IN AND RELATING TO THE RING MAGNET OF DYNAMO-ELECTRIC MACHINES
Year: 1884

page_text: COMBEIE
DIECIFICATION.
I THOMAS JOHN HANDFORD of 42 Southampton Buildings in the County of
Middlesex Patent Agent do hereby declare the nature of my Invention for
"IMPROVEMENTS IN AND RELATING TO THE RING MAGNET OF DYNAMO-ELECTRIC
MACHINES" 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 winding of the ring magnet of dynamo-electric
machines, the objects of the Invention being to wind the ring magnet more
expeditiously than has heretofore been practised and in such a manner that the
wire upon the spool or between the ring magnet and the spool will not kink or
twist into knots in the process of winding. These objects are attained in the
manner illustrated in the accompanying Drawings in which Fig. 1 represents one
of the magnet rings in the process of being wound and the manuer of winding the
same, Fig. 2 is a perspective view of the machine shewing a part of the covering
broken open and the ends of the wire or cable with which the magnet is wound
protruding through the covering and Fig. 3 is a detail which will be hereinafter
referred to.
In the process of winding the ring magnet as illustrated in Fig. 1, I first make a
hole in the upper part of the ring magnet A and thread it properly to receive the
threaded end of the rod B. This rod is provided with a head m at its upper end,
and is passed through the bracket or plate n which is secured to the ceiling of the
room in which the process is to be carried on. The rod passes loosely through the
plate n so that it is free to turn therein after the manner of a swivel. This rod is
screwed into the hole in the upper part of the ring magnet so as to suspend the
ring a convenient distance above the floor and so that it is free to be revolved as
shewn in the Drawing. After suspending the ring magnet in this manner the wire
(or the cable hereinafter mentioned) wound thereon from a suitable spool or.
bobbin by turning the ring magnet upon the swivel joint with one hand while the
operator merely guides the wire or cable by the other hand and passes it through
the opening at the bottom of the ring at each revolution thereof. In this manner
D

page_text: of winding the wire or cable comes directly up from the spool without any
tendency to become entangled and the ring can be wound much more conveniently
than it would be possible to do were the magnet held in a stationary position.
Yet even when practised as described the process of winding these magnets with
one continuous wire is sufficiently laborious on account of the great length of the
wires. Still further to facilitate the winding of the magnet, therefore, I employ
instead of a single wire a cable composed of a series of insulated wires; and after
winding I connect their respective ends so that they form practically one continuous
wire. In Figures 2 and 3 I have represented this cable C as composed of seven
separate insulated wires. The letters a, b, c, d, e, f, and g designating respectively
one end of these wires while the primed letters a¹, b, c, d, e¹, f¹, g₁ designate
respectively the opposite ends of the same wires. The magnet ring is wound with
this cable in the manner above described and after the desired length of the cable
is wound upon the ring its two ends are brought together and the end a of the first
wire is secured to the end b¹ of the second wire while the opposite end 6¹ of the
second wire is secured to the end c¹ of the next wire, and so on throughout the
series until the last wire is reached when its end g is left free, the end g and the
end a forming the ends of the magnet coil whereby the same effect is produced as
if a single wire seven times as long as the cable had been wound upon the magnet.
To wind the magnet with this cable requires only about one seventh of the time
required to wind the magnet with the same amount of wire not in the form of a
cable. The cable is formed of a series of wires containing a greater or less number
of separate wires as may be desired.
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It is obvious that either of the steps above described may be employed without
the other for the said purpose of facilitating the winding of the magnet but the best
effect is produced by using both parts of the Invention simultaneously, in other
words, by winding a cable or bunch of wires upon the field magnet, while the
latter is suspended and revolved as describod.
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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:
First. The herein described process of winding a ring magnet, which consists in
suspending the same so as to be readily revolved, then revolving the ring while the
wire or cable, whose end is secured thereto is guided and passed through the
opening at the bottom of the ring for every revolution thereof, substantially as and
for the purpose herein before described.
Second. The ring magnet of an electric machine wound with a cable composed
of a series of insulated wires having their ends connected together for forming one
continuous wire longer than the cable substantially as and for the purpose
hereinbefore described.
Dated this 23rd day of July 1884