A Battery Motor Of Few Parts
By Walter D. Sholl
The constructional details of a cheap and simple battery motor are shown
in the drawing here. The material needed is listed below.
8" 3/8" soft iron rod
2 1/2" 3/8" soft iron rod
2 pieces brass 2 1/2 " x 1/4" x 1/8"
8 small wood screws
2, 3/4", 6-32 bolts
Base board 4"x 4"x 1/2"
2 pieces brass spring 2 1/4" x 1/4"
1 piece steel wire 3" x No. 12
25 feet No. 20 S. C. C. magnet wire.
The longer piece of iron rod is bent as shown at Y, Fig. 1. The points F,
F are filed away to present a larger pole face to the ends of the
armature A, thus increasing the strength of the motor. One of the legs is
filed down about l/8" and two small holes H, H are drilled, through which
3/4" machine screws are placed, which secure it to the base. This field
member is mounted on the base centrally.
The smaller piece has a hole bored through the center of it, through
which the piece of No. 12 wire is passed, the rod being soldered to it at
the center. The details of the bearings and brushes are given in the
The shaft is bent to make contact when armature is 180° around and to
break when 360° around. The two shaft ends are bent in opposite
directions, so that there are two contacts during each revolution.
The armature must run true and easily and clear magnet at F, by about
1/16". The wire is wound on at W. For convenience the yoke Y may be taken
from base. If not, it must be adjusted by placing small pieces of wood
under magnet or bearings.
One end of the coil is fastened to binding post, the other to bearing.
The two brushes are connected together. This motor is designed to run on
eight cells, four in series and two in multiple. With this power and with
a pulley and flywheel on the shaft the motor may be used for driving
small mechanical toys. The motor will run light on two cells.
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