IMPROVEMENTS IN THE CONSTRUCTION OF ARMATURES FOR ELECTRICAL APPARATUS
Year: 1883

page_text: PROVISIONAL SPECIFICATION. left by Friedrich Carl Glaser at the Office
of the Commissioners of Patents on the 31st October 1883: Communicated
to him by Messieurs Kuksz Luedtke and Grether and Alphonse 'Isidore'
Gravier all of Warsaw in Poland Empire of Russia
FRIEDRICH CARL GLASER of Berlin in the Kingdom of Prussia and Empire of
Germany, Engineer and Patent Solicitor "IMPROVEMENTS IN THE CONSTRUCTION
OF ARMATURES FOR ELECTRICAL APPARATUS "
[communicated to him by Messieurs
Kuksz Luedtke and Grether and Alphonse Isidore Gravier all of Warsaw in
Poland Empire of Russia]
The object of the present invention is to construct armatures which may be
employed advantageously with all kinds of magnets electric motors, dynamo
electric and magneto electric machines, and other electrical apparatus.
The invention is based upon the well known fact that when a sheet of paper is
held over a magnetic field and iron filings are sprinkled thereon, the filings arrange
themselves in what are called the magnetic curves or lines of force of the field. If
now the small particles of iron are fixed in their position on the sheet of paper by
means of a substance capable of being easily fused or melted, such for instance as
solder or wax, an armature will be obtained which when set in a similar magnetic
field to that which produced these special curves, will be best adapted to that field.
In constructing armatures on this principle, filings or threads of steel or iron,
or generally finely divided particles of iron or steel, or any other magnetic or
paramagnetic metal, may be employed.
The above named filings or threads having been disposed or arranged according
to the magnetic curves or the lines of force of that magnetic field in connection
with which the armature is to be employed, will be formed into a mass of the
required shape by being united together by means of solder or other easily melted
alloy or substance and the armature thus obtained in the rough may be completed
by turning true in a lathe or by filing by hand.
If filings are employed for this purpose the complete armature will be formed
by superimposing single "surface elements" until the required thickness is
obtained. Each "surface element" will preferably be obtained by means of the
magnetic field with which the particular armature is to be employed, and the
eparate particles will be secured in their position by means of wax, paraffin or
ther substance capable of being melted at a low temperature.

page_text: If iron filings are used, the clement of the armature is ready as soon as the filings
are secured in their position.
When steel filings are employed and their position has been fixed, the form and
dimension of the armature inust be given to the entire element by cutting or
otherwise, and then the magnetization of the same or, as the case may be, the
increase of the already present magnetism, must be effected according to well
known methods.
If iron threads or wires are employed it is desirable to use wires of the smallest
possible cross section so as more easily to arrange the separato pieces according to
the magnetic curves, the form of which may be ascertained by the strewing of
filings; as by this means the forms and dimensions best suited to the desired end
can be readily arrived at.
If steel threads or wires are employed a subsequent magnetization or increase of
the magnetism will be necessary.
Armatures of this kind can also be produced by means of electrolysis or
electric deposition, the iron being precipitated onto a conducting plate which is
placed in the field intended to be employed. In this case the molecules of iron
will be deposited uniformly one upon another, and will arrange themselves
according to the magnetic curves of the particular field in question; and the
armature element so obtained, after it has been built up to the required dimensions,
will be trued in a lathe or otherwise finished.
The putting together of these elements to form parts of armatures to be
employed in the various kinds of electrical apparatus above mentioned, may be.
effected in any desired manner, and always in the way best suited for the particular
object in view, as the single elements of which they are composed are, from the
commencement, of the shape best adapted to the end in view.