IMPROVEMENTS IN DYNAMO ELECTRIC MACHINES AND ELECTRIC MOTORS
Year: 1883

page_text: LETTERS PATENT to Thomas Rowan of Palace Chambers in the city of
Westminster, Consulting Engineer, and Samuel Williams of Newport in the
county of Monmouth for an Invention of "IMPROVEMENTS IN DYNAMO
ELECTRIC MACHINES AND ELECTRIC MOTORS
"
PROVISIONAL SPECIFICATION left by the said Thomas Rowan and Samuel
Williams at the Office of the Commissioners of Patents on the 3rd January
1883.
THOMAS ROWAN of Palace Chambers in the city of Westminster, Consulting
Engineer and SAMUEL WILLIAMS of Newport in the county of Monmouth
"IMPROVEMENTS IN DYNAMO ELECTRIC MACHINES AND ELECTRIC MOTORS."
This invention relates to improvements in the construction of dynamo-electric
machines also applicable to electro motors the improvements having for object to
provide and combino an intense magnetic field, a very light conductor and great
velocity.
In constructing a dynamo machine according to our improvements we arrange
on the insides of two upright frame plates a series of coils to serve as the field
magnets, having their poles opposed to each other and having their cores united at
the back, as required, by a series of permanent magnets.
The two opposite sets of the field magnets are placed in very close proximity
whereby an intense inagnetic field is formed within which our improved armature
revolves. The armature is mounted upon a shaft or spindle which rotates through
the centre of the machine in suitable bearings arranged in the said side frames.
The armature is in its general principle a thin flat disc and is formed of a series of
thin plates of iron or copper and of the required dimensions. These metal lamina
are insulated from each other by means of suitable insulating material such as thin
parafined tissue. We take a number of such sets of plates and fix them in the
form of wheel spokes and connect the alternate ends of the said plates in such a
manner that they form a continuous clectrical circuit with the coils of the field

page_text: magnets by means of a suitably arranged commutator. This armature is con-
sequently very light and capable therefore of being revolved at a very high rate of
speed. Or the armature may be constructed of thin sheet iron or copper suitably
insulated in a continuous strip wound upon itself till a disc is formed and at a
certain distance from the centre outwards towards the circumference it is thinned
out to a dimension suitable for cutting through the very narrow space between the
coils above referred to.
By our arrangement the magnetic field will be cut, by a light weight conductor
moving with the greatest velocity, at a point of the greatest intensity compatible
with the introduction between the poles of the field magnets of such armatures as
we have described. It is apparent that our invention is also applicable for the
purposes of a motor when supplied with a suitable current. The improved
machine can be made to give either reciprocating'or continuous currents according
to the arrangement of the field magnets and the commutator and it is either
magneto or dynamo electric according to whether permanent magnets such as we
indicate are used or whether the field magnets are excited by any of the usual
methods.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Thomas Rowan and Samuel Williams in the Great Seal Patent
Office on the 3rd July 1883.
THOMAS ROWAN of Palace Chambers in the city of Westminster, Consulting
Engineer and SAMUEL WILLIAMS of Newport in the County of Monmouth
"IMPROVEMENTS IN DYNAMO-ELECTRIC MACHINES AND ELECTRIC MOTORS"
This invention relates to improvements in the construction of dynamo-electric
machines also applicable to electro motors the improvements having for object to
provide and combine an intense magnetic field, a very light conductor and great
velocity.
In constructing a dynamo machine according to our improvements wo arrange on
the insides of two upright frame plates a series of coils to serve as the field magnets,
having their poles opposed to each other and having their cores united at tho
back, as required, by a series of permanent magnets. The two opposite sets of the
field magnets are placed in very close proximity whereby an intense magnetic field
is formed within which our improved armature revolves. The armature is mounted
upon a shaft or spindle which rotates through the centro of the machine in suitable
bearings arranged in the said side frames. The armature is in its general principle
a thin flat disc and is formed of a series of thin plates of iron or copper and of the
required dimensions. These metal laminæ are insulated from each other by means
of suitable insulating material such as thin paraffined tissue. We take a number
of such sets of plates and fix them in the form of wheel spokes and connect the
alternate ends of the said plates in such a manner that they form a continuous
electrical circuit with the coils of the field magnets by means of a suitably arranged
commutator. This armature is consequently very light and capable therefore of
being revolved at a very high rate of speed. Or the armature may be constructed
of thin sheet iron or copper suitably insulated in a continuous strip wound upon
itself till a disc is formed and at a certain distance from the centre outwards
towards the circumference it is thinned out to a dimension suitable for cutting
through the very narrow space between the coils above referred to.
By our arrangement the magnetic field will be cut by a light weight conductor
moving with the greatest velocity at a point of the greatest intensity compatible
with the introduction between the poles of the field magnets of such armatures as
we have described. It is apparent that our invention is also applicable for the
purposes of a motor when supplied with a suitable current. The improved machine
can be made to give either reciprocating or continuous currents according to the
arrangement of the field magnets and the commutator and it is either magneto or
dynamo electric according to whether permanent magnets such as we indicate are
used or whether the field magnets are excited by any of the usual incthods.
Having thus described our said invention what we claim is :-
The improved dynamo electric machine herein described.
In Witness whereof I the said Thomas Rowan for and on behalf of myself
and the said Samuel Williams have hereto set my hand and seal this
third day of July in the year of our Lord one thousand eight hundred and
THOMAS ROWAN (L.S.)