Unfortunately, this little machine is not self-starting, but a
slight pull on the belt just as the current is turned on is all
that is needed, and the motor rapidly gathers speed provided no
load is put on until it is in step with the alternations of the
supply. It then runs at constant speed whether given much or
little current, but stops if overloaded for more than a few
seconds.
The stator has four poles and is built up of pieces of sheet iron
used for stove pipes, which runs about 35 sheets to the inch. All
the pieces are alike and cut on the lines with the dimensions as
shown in Fig. 1, with the dotted line, C, to be filed out after
they are placed together. Each layer of four is placed with the
pointed ends of the pieces alternately to the right and left so as
to break joints as shown in Fig. 2. The laminations were carefully
built up on a board into which heavy wires had been driven to keep
them in place until all were in position and the whole could be
clamped down. In the middle of the pieces 1/4-in. holes, B, were
then drilled and 1/4-in. bolts put in and tightened up, large
holes being cut through the wood to enable this to be done.
Pages:
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310