|
Title: |
1895 Article-Electro-Dynamic Co., Electric Motor |
|
Source: |
Modern Mechanism 1895 pg 540 |
|
Insert Date: |
8/30/2011 9:58:12 PM |
|
The Griscom motor is remarkable for the small space it occupies, due to its neat and compact design, shown in Fig. 4. The armature is entirely encased by the cylindrical electro-magnet within which it revolves, and by the metallic caps or disks fitted to this cylinder at each end. The cylindrical field magnet is composed of a cylinder of soft iron wired in two large coils, each of which covers nearly one-half of the cylinder, the space left between the two coils at opposite sides of the cylinder constituting the magnetic poles of this cylindrical electro-magnet. The current which passes through the wire on this magnet circulates in opposite directions in each coil or section, so that both coils combine to produce a north pole in one of the open spaces, and a south pole at the other. The result is practically the same as if two U electro-magnets were brought together with like poles in opposition, these forming a circular magnet with two consequent or combined poles, one at each junction. The iron of the cylindrical magnet projects laterally at each pole, and to these projections an ornamental brass disk is screwed firmly at one end. as shown in the figure. The binding post shown at the top is prolonged on the other side of the metallic cap, and carries one of the brass springs or brushes which serve to convey the current to the armature by pressing on the commutator. The other brush, touching on the opposite side of the commutator, is held in place by a special screw device attached to the metallic cap. The armature and the field magnet are connected in series. The current, entering the armature by the tipper commutator spring leaves it by the lower, from which it passes to the field magnet, whence it goes to the second binding post. |
|
1895 Electro-Dynamic Co., Electric Motor
|
|