Improvements in Magneto-electric Machines.
Year: 1889

page_text: Date of Application, 24th Dec., 1889-Accepted, 25th Jan., 1890
COMPLETE SPECIFICATION.
Improvements in Magneto-electric Machines.
I REGINALD HADDAN of the firm of Herbert & Co. Patent Agents of 18 Bucking-
ham Street, Strand, W.C. in the County of Middlesex Civil Engineer do hereby
declare the nature of this invention, a communication to me from abroad by Charles
Forrest Gillette of New York, in the United States of America Electrician and
in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement:—
I will describe a magneto electric machine embodying this improvement and then
point out the various features in a claim.
In the accompanying drawing
Fig. 1 is a plan or top view of a magneto electric machine embodying this
improvement.
Fig. 2 is a transverse section of the same.
Similar letters of reference designate corresponding parts in both figuros.
The field magnet of this magneto electric machine is composed of a number of
steel plates A placed one against another. These plates are of circular form and
they have extended inwardly from them at opposite points segmental pole
pieces a¹ a². These pole pieces extend almost in contact with one another as here
shown. The connection between them and the main portion of the magnet plates
is preferably quite narrow as shown. Any desirable number of these plates may
be employed as shown but three are used. They are supported upon a wooden
block B of annular form to which they are secured by bolts C extending through
the block B into a wooden base piece D.
The magnet plates A, may be cast ready for use save that the inner circum-
ferential edges of the pole pieces will need to be trimmed or turned off to render
them absolutely true.
E designates an electro magnet or armature having trunnions e extending from it at
right angles to its axis and at the middle of its length. The trunnions e may be
formed integral with the core of the electro magnet or armature which as usual will
be made of soft iron. Preferably the core will be made oval, the large diameter of..
the oval appearing in Fig. 2 and the small diameter in Fig. 1 and as shown, the
trunnions extend from a flange e¹ that extends from the core at about the middle of
the length of the latter. At each side of this flange the core is wound with wire,.
plates being provided at the ends of the core to keep the wire in place.
One of the trunnions of this armature or electro magnet is supported in a metal
plate F attached to the lowermost plate and the other is journalled in a metal frame G
secured to the uppermost magnet plate A. This frame G may be secured in place by
the same bolts C that secure the magnet plates A together and to the base pieces.
The plates F and G are as shown secured upon the field magnets by bolts which extend
through both said frames and the magnet plates.
One end of the wire of the armature or electromagnet is attached to the core thereof.
The other end passes transversely into the lower trunnion e an insulated bushing being
inserted transversely into this trunnion at the point where the end of the wire enters
it so as to insulate this end of the wire from the trunnion and consequently from the
armature core. This trunnion has also fitted to it another bushing of insulating
material. The latter extends longitudinally into the trunnion and has a wire H
extending from it into the end of the trunnion. This wire H is of course insulated
from the trunnion. It is in electrical communication with the end of the armature or
electromagnet wire that extends into the trunnion.
The plate F at about the middle of its length where it supports the lower trunnion
of the armature or electromagnet is raised or elevated above the base piece.

page_text: The lower trunnion of the armature or electromagnet is shouldered so that it may
be supported by the said plate F notwithstanding its end extends through the plate.
Below the plate is a metal spring I with which the wire H is in contact. The wire of
the armature or electromagnet is consequently in electrical communication with this
metal spring I. The metal spring I may be fastened to the base piece or it may be
fastened to one of the magnet plates A if insulated from the latter. One of the circuit
wires with which the machine is designed to be used will be fastened to this metal
spring, the other will be fastened to a binding screw B₁ which is secured to one of the
magnet plates A or the frame G.
The upper trunnion e of the armature or electromagnet E has affixed to it a toothed
pinion With this pinion engages a large gear wheel f¹ which is affixed to a
shaft that is journalled in the frame G. The shaft f' has affixed to it a cranked
handle J.
By manipulating the handle J. the shaft f' may be rotated so as to impart a very
rapid rotation to the armature or electro magnet E. As the latter rotates, its core
passes in close proximity to the pole pieces of the field magnets. The poles of the
armature or electromagnet have a long sweep within the magnetic field of each pole
piece of the permanent magnet so that said armature or electromagnet has a great
opportunity to acquire or establish its electric polarity. Owing to the fact that the
pole pieces of the permanent magnet extend in close proximity with one another the
charge or discharge of polarity is very abrupt, consequently very powerful
alternating currents are set up within the coils of wire of the armature or electro
magnet. As the poles of the armature or electro magnet are within the magnetic
field of each pole piece of the permanent magnet for the greater part of each
revolution, the alternating currents, generated are more of an intensity nature than
they would be otherwise. This is desirable for the purpose of ringing bells over
great length of wires at high resistance. The field magnet, the armature and the
driving mechanism are all secured together by means of the plates F and G and
constitute one structure which may be secured to any convenient base piece or
support. This is very advantageous because the machine may be quickly and easily
erected by inexperienced persons and has no separate parts which may become lost
in handling or shipment. The machine is moreover very cheap and durable.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is.
1. In a magneto electric machine the combination with a permanent magnet
consisting of circular plates provided with pole pieces composed of plates nearly semi
circular in form and having their square ends substantially parallel with and close to
the corresponding ends of the opposite pole pieces of an armature having central
transverse trunnions, a plate bolted to the lower plate of the field magnet and
supporting the lower trunnion of the armature and a frame extending over the top of
the field magnet and bolted to the upper plate thereof to give bearing to the upper
trunnion substantially as described.
2. In a magneto electric machine, the combination with a permanent magnet
consisting of circular plates provided upon opposite sides with pole pieces composed
of substantially semi circular plates a² a² having their square ends substantially
parallel with and close to the corresponding ends of the opposite pole piece, of the
armature E having central transverse trunnions e¹ the lower one resting upon a
plate F bolted to the lower plate of the field magnet and the other having bearing in
the arm or extension on a frame G bolted at its ends to the upper plate of the field
magnet and a gear f¹ journalled in an arm upon said frame and having a shaft lying
in an extended bearing on the arm, said gear meshing with a pinion on the trunnion
substantially as described.
3. In a magneto electric machine, the combination with a field magnet composed of
circular plates A and having pole pieces ah a² mounted on their inner edges of a
frame G mounted on the upper plate A and connected thereto. by, bolts, C. which also.

page_text: unite the several plates A, a plate F mounted on the lower plate A and connected
thereto by the bolts C an armature supported by said frame and plate and a gear fl
journalled in the frame and meshing with a pinion on one of the trunnions of the
armature substantially as described.
1 1000
HERBERT & Co.,
18, Buckingham Street, Strand, London, W.C., Agents to Applicant.