IMPROVEMENTS IN DYNAMO- ELECTRIC MACHINES
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I, SAMUEL WILLIAMS of 185 Commercial Road Newport, in the County of
Monmouth, Secretary of the Newport (Mon.) Chamber of Commerce (Incorporated)
do hereby declare the nature of my invention for IMPROVEMENTS IN DYNAMO-
ELECTRIC MACHINES to be as follows:-
"
This Invention relates to Improvements upon the Apparatus for which appli-
cation for the grant of Letters Patent was made by me on the 2nd Jan. 1884 tho
same having been accepted under N° 314, of 1884 According to my Invention
I construct the armature of my Dynamo-Electric Machine as follows-I produco
by casting in copper or other conducting material straight flat bars of suitable
dimensions each bar having a division through its thickness down the centre till
near one end thus constituting two limbs joined at one extremity where they
remain in permanent union. The other free or divided end is recessed on the
inside edges of each limb for a short distance so as to enable said recessed edges to
fit on and be fastened to the sides, at its periphery, of a flat boss by small bolts &
nuts which, passing through, the substance of the boss, and thus securing the ends
of the limbs thereto, also bring them into firm electrical contact with each other.
Each limb at the free or divided end has projections extending at right angles
outwards which serve the purpose of additional fastenings on to the boss by being
fixed with screws to the edges of two other bosses which are bolted one on to each
side of the first named boss. The flat bars are cast, as already mentioned, and
being thereby produced in the full & complete shape or pattern as described; are
thus ready for drilling with bolt & screw holes & for mounting on the bosses as
described. The said shape or pattern with the mode of fastening as described
provides a rigid base and a firm structure with regard to integrity of the armatura
when completed and at work. And the fact of casting the armature in the single
sections as described furnishes a cheap, easy & expeditious metho:i of manufacture
for this particular portion of Dynamo-Electric machines In bolting the bars to
the first named or middle boss the right hand limb of one bar goes to the left hand
limb of the next bar and so on until a necessary series constituting a right hand
winding or a description of coil equal thereto is formed. The order of joining the
limbs is then reversed so as to form a left hand winding. The armature consists
of a requisite number of such radial bars forming a series of alternating right &
left-hand approximately straight flat sector shape coils and is coated with shellac
varnish for insulation. The field magnets of my Improved Dynamo-Electric
machine as above described, are opposed in sign & alternate in polarity, of course,
in the usual way.

page_text: My present Invention relates to further improvements-upon the Invention-for-
which Letters Patent were granted to me No 314 dated 2nd January 1884 This
present Invention of mine consists in forming the armature as follows produce
by-castin utting or stamping out, but preferably by casting in copper or other
conducting material straight flat-bars of suitable dimensions each bar having
a division through its thickness down the centre till near one-end-thus constituting
two limbs joined at one extremity where they-romain in permanent union. The
other free, or divided-end is recessed on the inside edges of each limb-for-a-short_
distance so as to enable said recessed edges-to-fit-on-and be fastened to the sides,
at its periphery, of a flat boss by bolts and nuts, preferably of copper-which-
passing through the substance of the boss and thus mechanically securing the ends
of the limbs thereto also bring them into firm electrical contact with each other.
Further cach limb at the free or divided end has projections extending at right
angles outwards which serve the purpose of additional fastenings on to the boss by
being fixed with screws to the edges of two other bosses which are bolted one on
to each side of the first named boss. The flat bars made as already mentioned,
preferably by casting are thereby produced in the full & complete shape or pattern
as described and are thus ready for drilling with bolts holes and for mounting on
the boss The said shape or pattern with the mode of fastening as described
provides a rigid base and a firm structure with regard to the mechanical and
electrical integrity of the armature when completed and at work. And the fact of
casting the armature as described furnishes a cheap, casy & expeditious method
of manufacture for this particular portion of Dynamo Electric Machines. In
bolting the bars to the first mentioned or middle boss, the right hand limb of one
bar goes to the left hand limb of the next bar; and for rotation between field
magnets of opposed polarity and alternating in sign, the method of connection
would be upon the same principle as described and so on until a necessary series
constituting a right hand winding or a description of coil equal thereto is formed.
The order of joining the limbs is then reversed so as to form a left hand winding.
For use in a field as mentioned, the armature consists of a requisite number of
such radial bars forming a series of alternating right & left hand approximately
straight flat rectangular looking coils. The conductor portion of the armature can
then be coated with shellac varnish or other suitable preparation for greater
insulation; although as will be seen, the invention provides for efficient insulation
by means of the air spaces which necessarily exist between the parts of the bars as
described, said spaces also allowing ventilation for the dissipation of heat.

page_text: Having now described and particularly set forth the nature of the said Invention
and the manner of carrying the same into effect I would have it understood that
what I claim is
First The production by casting (or other equivalent process) of the conductor
portion of the armature in the shapes or patterns substantially as hereinbefore
described.
Second-The method of utilising the electrical connections for the purpose of
mechanical fastenings substantially as hereinbefore described.
Third-In Dynamo Electric machines, the use of an armature the conductor
portion of which is formed of castings of the pattern or shape, and connected and
fastened all substantially as hereinbefore described.