Handy man's workshop and laboratory . e, orrotor as it is called in an machine, requires no such deli-cate parts as insulated wire coils, commutator, and field magnet, or stator, offsets much of this advantage,however, as it is impossible to use an iron or steel casting for thispart, since the entire magnetic circuit must be built up of thinplates of sheet steel. If a solid casting were used the alternatingcurrent would set up wasteful or eddy currents within it, and themotor would be burned up by the energy thus converted into 264 HANDY MANS WORKSHOP AND LABORATORY heat
Handy man's workshop and laboratory . e, orrotor as it is called in an machine, requires no such deli-cate parts as insulated wire coils, commutator, and field magnet, or stator, offsets much of this advantage,however, as it is impossible to use an iron or steel casting for thispart, since the entire magnetic circuit must be built up of thinplates of sheet steel. If a solid casting were used the alternatingcurrent would set up wasteful or eddy currents within it, and themotor would be burned up by the energy thus converted into 264 HANDY MANS WORKSHOP AND LABORATORY heat. In factories where small motors of this kind are made,the thin sheets for the stator and rotor are punched out by ma-chines built for the purpose. For the amateur, however, the only-successful way in which so many irregular-shaped pieces ofmetal can be made all alike is to first bolt the required number ofsteel sheets on the face-plate of a lathe, and then bore out theinside and turn off the outside to the required dimensions. This. Fig. 215—Details of stator and rotor core plates will leave a heavy ring made up of the sheets, on the inside ofwhich, in the case of the stator, the four pole-pieces can be readilyformed by drilling and sawing away. When finally completed,the stator and rotor core plates should have the form and dimen-sions as shown in Fig. 215. For the stator core about 25 pounds of thin sheet steel arerequired, cut 7 inches square. This is sold at hardware storesunder the somewhat misleading trade names of Russia iron, HANDY MANS WORKSHOP AND LABORATORY 265 sheet or stovepipe iron/ and roofing tin. The most desir-able thickness is about 15/1,000 or 1/64 of an inch, but anythingthicker than 25/1,000 will answer the purpose. If roofing tin isselected, the cheaper grades are the most desirable, and better ifsomewhat rusty. When tightly compressed, the bundle of sheetsshould measure !]/§ inches in thickness or a trifle over. If the lathe is large enough to swing
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