AN IMPROVED ELECTRO MOTIVETM ENGINE
Year: 1883

page_text: LETTERS PATENT to Alexander Browne of Highbury New Park in the
County of Middlesex for an Invention of "AN IMPROVED ELECTRO MOTIVE™
ENGINE"
"
PROVISIONAL SPECIFICATION left by the said Alexander Browne at the
Office of the Commissioners of Patents on the 17th May 1883.
ALEXANDER BROWNE of Highbury New Park in the County of Middlesex
AN IMPROVED ELECTRO MOTIVE ENGINE"
According to this Invention I arrange round a hub (preferably of iron)
projecting radially therefrom a number of bars of soft iron similar in appearance
to the spokes of a wheel these bars hereinafter called spokes may be either built up
by means of plates or may be solid or tubular but in any case the projecting ends
are fitted or formed with suitable pole pieces I then wind these circularly with
properly insulated conducting wire so as to form them into Electro Magnets. In
forming the pole pieces of the armature they are so arranged that either side shall
overlap the ends of the field magnets in such a manner so that the attraction shall be
taken not only from the sides of the magnets but from the ends thereof also or if
preferred the pole pieces of the field magnets may overlap the ends of the armature
in which case the power would be taken from the end and side of the armature.
The armature when formed I key onto a shaft or spindle and either on one or both
sides I place a number of field magnets preferably corresponding in number to the
spokes of the armature where only one is employed and double the number where
both sides of the armature are used these field magnets are attached to a boss or
hub similar to the armature but in fixing the spokes they are so arranged that
each alternate one is of opposite polarity but where two sets of field magnets are
employed i.e. one on each side of the armature I arrange them so that similar poles
shall come opposite each other so that the armature when at work may always
pass at the moment of greatest effect between similar poles-the pole of the
armature attracted being of course of opposite polarity at the moment of attraction..
[Pming dal

page_text: The magnets in the armature are so connected with a suitable commutator that
their polarity shall change when their poles are in a line with the field magnets.
The field magnets may be constructed either of soft cast malleable cast or wrought
iron or may if desired be made permanent magnets.
If I wish to increase the power of a machine according to this Invention I key
onto the axle another armature on the outside of which I arrange a third set of
field magnets thereby employing the outside of one set of the field magnets thus
requiring only three sets of field magnets to two armatures and thus I may
continue to increase the number of armatures and sets of field magnets alternatively
until I have obtained the required power.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Alexander Browne in the Great Seal Patent Office on the
17th November 1883.
ALEXANDER BROWNE of Highbury New Park in the County of Middlesex.
'AN IMPROVED ELECTRO MOTIVE ENGINE"
According to this Invention I arrange round a hub (preferably of iron)
projecting radially therefrom a number of bars of soft iron similar in appearance
to the spokes of a wheel these bars hereinafter called spokes may be either built.
up by means of plates or may be solid or tubular but in any case the projecting
ends are fitted or formed with suitable pole pieces. I then wind these circularly
with properly insulated conducting wire so as to form them into Electro Magnets.
In forming the pole pieces of the armature they are so arranged that either side shall
overlap the ends of the field magnets or that the poles of field magnets shall overlap
the armature as hereafter described. The armature when formed I key on to a shaft
or spindle and the field magnets I make according to one arrangement in the form
of a ring having the desired number of poles formed as hereafter described the
different segments of this ring are wound with wire so as to form them into a
series of electro magnets which are so connected up that each pole shall be of
opposite polarity to the other. The ring having the field may be either of soft.
iron malleable cast iron or wrought iron. And in order to explain my said
Invention more fully I will now proceed to describe the same with reference to
L
T
1
Fig 1 is an elevation of a machine constructed according to my said Invention
Fig section through line Z Z Fig 1. A shews the magnets of armature with
pole pieces B these are fitted in a boss of iron C mounted on a shaft D
The magnets A may be formed either of plates or of solid iron
•
E shews the ring forming the field magnets F shews the pole pieces thereof
formed so as to envelop or nearly so the poles of the armature opposite same when
revolving thus cutting as near as possible all the lines of force. G shews a frame bolted
to the ring E having bearings H for carrying shaft D the frame G may be bolted to
suitable standards fixed to a bed plate or it may be otherwise suitably fixed
The bobbins of the armature are connected to the plates of a suitable
commutator these connections it is unnecessary to describe as they are well known
to Electricians
Instead of the field magnets being formed by a ring according to a modification
I form them radially similar to the armature and preferably less in number say
eight field magnets to thirty bobbins of armature). This is the number I have
shewn at Figs 1 and 2 although I do not of course wish to limit myself to this
number. In this modification I propose having a set of field magnets on either
side of armature as shewn
This modification of the field magnets is shewn at Figs 3 and 4 Fig 3 is an
elevation and Fig 4 section through line X X Fig 3. The same letters denote the
same parts In tigs 3 and 4 it will be seen that the poles of the magnets which
come opposite one another are connected together so as to form the pole F
therefore the magnets so connected must be of similar polarity thus forming one
pole According to this modification the poles of the field inagnets overlap the poles
of the armature

page_text: Having thus described the nature and object of my said Invention and the
means whereby the same may be carried into practical effect I would remark in
conclusion that what I claim as my invention is
Firstly the armature formed of T shaped bobbins arranged radially all
substantially as set forth
Secondly the ring forming the field magnets with poles enveloping the T ends
of the bobbins in combination with my improved armature substantially as
set forth
Thirdly the modification represented at Figs 3 and 4 of the drawings
· Fourthly an electric motor constructed and arranged substantially as set forth
and shewn at Figs 1 and 2 of the drawings or according to the modification
thereof shewn at Figs 3 and 4
In Witness whereof I the said Alexander Browne have hereunto set my hand
and seal this seventeenth day of November in the year of our Lord one thousand
eight hundred and eighty three
ITT T DDAMZAZ