Improvements in Automatic Regulators for Dynamos and Motors.
Year: 1890

page_text: COMPLETE SPECIFICATION.
Improvements in Automatic Regulators for Dynamos and Motors.
We, FREMONT JOHN CLEAVER, Electrician, of Manton Alley, 31 Ward, and
GEORGE FASSOLD, Labourer, of No. 1116 Bradford Street, 29 Ward, both in
Pittsburgh, in the County of Allegheny and State of Pennsylvania, United States of
America, do hereby declare the nature of this invention and in what manner the
same is to be performed, to be particularly described and ascertained in and by the
following statement:-
The object of our invention is to provide a simple and effective regulator for dynamos
and motors.
Our invention consists in the combination, with the field magnet of a dynamo, of
an armature formed of a hollow cylinder of non-magnetic material wound with a
conductor, a commutator cylinder connected with the conductor of the armature, an
armature core placed within the hollow cylinder and supported by a shaft extending
through the tubular armature shaft and a pair of brushes connected with the shaft
of the armature core-so as to be moved thereby.
It also consists in the combination, with the movable brushes, of curved bars
connected electrically with the brushes for taking off the current, all as will be
hereinafter more fully described.
Reference is to be had to the accompanying drawings, forming part of this
Specification, in which Figure 1 is a side sectional elevation of a dynamo to which our
improved regulator has been applied; Figure 2 is an end elevation of the same;
Figure 3 is a transverse section, taken on line a- Figure 1; and Figure 4 is a detail
view of the armature core. Similar letters of reference indicate corresponding parts
in all the figures.
The field magnet A is of the usual construction and will, therefore, need no special
description..
The armature B is formed of circular end pieces a a¹ mounted upon the tubular
shafts. To the circular end pieces a a is secured a hollow cylinder of non-
magnetic material. The said cylinder is wound with the conductor in the usual way,
the terminals of the coil of the same being connected with the commutator cylinder D.
Within the hollow cylinder C and upon the shaft c, is mounted an armature core E
which loosely fits the hollow cylinder C. The said armature core E consists of the
segment of a cylinder of iron, having concave sides either laminated or homogeneous.
The shaft c is prolonged beyond the tubular shafts 661. The ends of the said shaft
are supported on pointed screws d d' inserted in yokes e e' attached to the supports of
the journal boxes of the tubular shafts. To the shaft c is secured a cross-arm F
of insulating material in which are inserted rods ff which carry the commutator
brushes gg. The cross-arm F carries metallic contact plates which are connected
electrically with the rods ff' and touch the curved bars i which receive the current
from the brushes. The curved bars are provided with binding posts j' for
receiving the conducting wires leading from the dynamo. To the end of the shaft c,
opposite that carrying the cross arm F, is attached one end of a spiral spring e² which
surrounds the end of the said shaft and is attached by its opposite end to the yoke e¹.
This spring is designed to oppose the pull of the armature on the core E and to return.
the core and the brushes to their original position when the machine is idle.
1
It will be seen by this construction that the brushes will always occupy the same
position relative to the armature core E. This armature core will shift automatically
in accordance with the drag or lead of the armature and will always take up its
position with its poles in the strongest part of the field. In consequence of this
arrangement, the brushes will always be held to the point of the least sparking and the
adjustment of the brushes will be effected automatically by every change of load upon
the dynamo or motor to which our improvement is applied.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is―
1. In a regulator for dynamos, the combination of an armature formed of a hollow
cylinder of non-magnetic material, conductors arranged upon the hollow cylinder, a
commutator cylinder connected with the conductors, a movable armature core
supported within the armature cylinder, and commutator brushes connected with the
armature core, substantially as specified.
2. In a regulator for dynamos, the combination of the field magnet A, the hollow
cylinder provided with the tubular shafts 6', the commutator cylinder D, the
armature core E formed of the segment of a cylinder of magnetic material, the shaft c
supporting the armature core and carrying the arm F, and the brushes provided
with the rod f and arranged to bear upon the commutator cylinder D, substantially as
specified.
1000.
F. J. CLEAVER.
G. FASSOLD.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.