Improvements in Electric Motors.
Year: 1888

page_text: Date of Application, 26th Nov., 1888
Complete Specification Left, 26th Aug., 1889-Accepted, 26th Nov., 1889
PROVISIONAL SPECIFICATION.
Improvements in Electric Motors.
I, WILLIAM MORRIS MORDEY, of Victoria Works, 112 Belvedere Road, Lambeth,
in the County of Surrey, Electrician, do hereby declare the nature of this invention
to be as follows:-
This invention has reference to alternate or periodic current motors.
A principle of electro-dynamic rotation has recently been described by Professor
Ferraris based on the combination of two alternating magnetic fields that are displaced
in position and in point of time with regard to each other and which produce an
effect which is the equivalent of a rotating magnetic field.
It has heretofore been sought to apply this principle to the construction of practical
alternate current motors by using for the generation of alternate currents, two dynamos
having a certain difference between the phases of their currents, or it may be by one
dynamo whose armature being wound with two sets of coils or windings differing in
position, produces currents of corresponding difference of phase. The currents so
produced require three or four conductors to convey them to the motor or motors.
The principal object of this invention is to construct motors which will themselves
cause the difference of phase and thus dispense with any necessity for special doubly
wound or duplicate dynamos, and enable power to be transmitted by two conductors
instead of three or four.
According to my invention I obtain this result by causing the coils or winding of
one portion of the field to be traversed by currents received from an ordinary
alternating source, while currents induced in the armature are caused to traverse
the coils or winding constituting the other portion of the field. In this latter circuit
I may insert an impedance coil. With this construction it is not necessary to provide
the armature with a commutator, but merely to connect it to one portion of the field.
by means of simple collecting rings and brushes.
11000
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Electric Motors.
I, WILLIAM MORRIS MORDEY, of Victoria Works, 112 Belvedere Road, Lambeth, in
the County of Surrey, Electrician, 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 :-
This invention has reference to alternate or periodic current motors.
A principle of electro-dynamic rotation has recently been described by Professor
Ferraris based on the combination of two alternating electric currents that are displaced
in position and in point of time with regard to each other, and which produce an
effect which is the equivalent of a rotating magnetic field.
It has heretofore been sought to apply this principle to the construction of practical
alternate current motors by using for the generation of alternate currents, two dynamos
having a certain difference between the phases of their currents, or it may be by one
dynamo whose armature being wound with two sets of coils or windings differing in
position, produces currents of corresponding difference of phase. The currents so
produced require three or four conductors to convey them to the motor or motors.
The principal object of this invention is to construct motors which will themselves

page_text: cause the difference of phase and thus dispense with any necessity for special doubly
wound or duplicate dynamos, and enable power to be transmitted by two conductors
instead of three or four.
According to my invention I obtain this result by causing the coils or winding of
one portion of the field of the motor to be traversed by currents received from an
ordinary alternating source, while currents induced in the armature are caused to
traverse the coils or windings constituting the other portion of the field. In this
latter circuit I may insert an impedance coil.
The figure shews such an arrangement diagrammatically. F, F is the fixed portion
or field magnet which receives an ordinary alternating current by the terminals T T.
This current traverses the coils ff. Other coils f, f¹ are provided on the fixed
portion and these are connected to a winding a a on the armature or rotating
portion A by means of the collecting rings C C and brushes b b. Another winding
or other windings a¹ a¹ which are short circuited on themselves are provided on the
armature A.
An inductional resistance or impedance coil L may be inserted in the circuit a a, f f
as shown.
By the terin armature in this Specification is meant the portion of the machine in
which currents are induced by the action of the currents sent from an external source
through the portion of the machine which is called the field.
With the construction described it is not necessary to provide the armature with a
commutator, but merely to connect it to one portion of the field by means of simple
collecting rings and brushes.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is
In an alternate current motor, the construction comprising a series of magnetising
or field windings a portion or portions of which are traversed by an alternate current
from an external source, while another portion, or other portions, is or are traversed
by an alternating current obtained from the arinature, with or without the interposition
of an impedance coil substantially as described.
Dated this 26th one of Aument 1000
W. M. MORDEY,
Per L. W.