Improvements in Electrically-driven Fans.
Year: 1889

page_text: Date of Application, 18th Apr.; 1889
Complete Specification Left. 18th Feb.. 1890-Accepted. 22nd Mar.. 1890
PROVISIONAL SPECIFICATION.
Improvements in Electrically-driven Fans.
I, HENRY GARWOOD WATEL of the Blackman Ventilating Company Limited
63 Fore Street in the City of London, Engineer, do hereby declare the nature of this
invention to be as follows:-
My invention relates to the driving of fans by electricity applied in such a manner
that there is no strain of bands or other connections for transmitting power nor consequent
friction of bearings, nor is there any torsive strain on the shaft. For this purpose, I
convert the rim of the fan into the armature of an electro dynamic machine or I apply
the ring armature of such a machine to the periphery of the fan, and I convert the
fixed framing within or against which the fan works into field eloctro magnets or I
apply such field magnets to the framing. The coils of the armature or those of the
field magnets are connected to a suitable commutator on the axis of the fan, and thus
when the machine is put in circuit with a suitable source of electricity the fan is
caused to revolve by the magnetic action applied at its periphery. Instead of
employing an armature of complete ring form, it may consist of segments of a ring
or it may be of spoke form, the magnetic force acting at the outer extremities of the
spokes which correspond with the periphery of the fun. Permanent magnets may
take the place of the electromagnets which in the working of the machine undergo no
change of polarity.
Dated this 18th day of Anril 1889
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Electrically-driven Fans.
1, HENRY GARWOOD WATEL, of the Blackman Ventilating Company Limited,
63 Fore Street, in the City of London, Engineer 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 :-
My invention relates to the driving of fans by electricity applied in such a manner
that there is no strain of bands or other connections for transmitting power nor
consequent friction of bearings, nor is there any torsive strain on the shaft. For this
purpose, I convert the rim of the fan into the armature of an electro dynamic
machine or I apply the ring armature of such a machine to the periphery of the fan,
and I convert the fixed framing within or against which the fan works into field
electro magnets or I apply such field magnets to the framing. The coils of the
armature or those of the field magnets are connected to a suitable commutator on the
axis of the fan, and thus when the machine is put in circuit with a suitable source
of electricity the fan is caused to revolve by the magnetic action applied at its
periphery. Instead of employing an armature of complete ring form it may consist
of segments of a ring or it may be of spoke form, the magnetic force acting at the
outer extremities of the spokes which correspond with the periphery of the fan.
Permanent magnets may take the place of the electro magnets which in the working
of the machine undergo no change of polarity.
The accompanying drawings shew various arrangements by which my invention
may be carried out in practice.
As shewn in Fig. 1 the stationary circular frame is coiled so as to present two
polar fields N and S and the spokes of the fan, to which the blades can be secured in

page_text: any convenient manner, are coiled with insulated wires connected to the plates of a
commutator C on the axis.
As shewn in Fig. 2, the rim R of the fan has coils connected to the
commutator C.
As shewn in Fig. 3, of which Fig. 4 is a side view shewing blades B, both the
stationary frame F and also the rim R of the fan are coiled in sections, some of which
might be cut out of circuit if necessary to reduce the driving power.
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 :-
1. The herein described method of driving a fan by providing the fixed framing and
the revolving fan with suitable coils and commutator so that when supplied with
electricity they operate together as an electro dynamic machine.
2. The combination of a stationary coiled ring frame with a fan having its spokes or
rim coiled and a suitable commutator, operating as an electro dynamic machine to
drive the fan, substantially as described.
Dated this 10th dow of Tohar 1800
ABEL & IMRAY,
Agents for the Applicant.