. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . FiG. 73.—Wenstrom dynamo—section. ductors in which the currents are induced. This gap introduces a very high magneticresistance in the circuit for the magnetic induction. To avoid this, therefore, the conductors 228 DYXAMO-ELECTRIC MACHINES. are buried in grooves or holes (Fig. 74). The distance between the poles and the core is thuslimited to the small gap required for the safe revolving of the armature. The magnet
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . FiG. 73.—Wenstrom dynamo—section. ductors in which the currents are induced. This gap introduces a very high magneticresistance in the circuit for the magnetic induction. To avoid this, therefore, the conductors 228 DYXAMO-ELECTRIC MACHINES. are buried in grooves or holes (Fig. 74). The distance between the poles and the core is thuslimited to the small gap required for the safe revolving of the armature. The magneticresistance and the magnetic circuit are by this means reduced in a high degree, and con-sequently the magnetizing power necessary for creating the required magnetism in thearmature is also Fig. 74.—Multipolar armature. A test made by Dr. Louis Duncan, Dr. G. A. Tjiebig. and ]\Ir. W. F. Hasson, of .JohnsHopkins University, on a 400-amj)cre 110-volt dynamo of this type, gave the following machine was built for 400 revolutions per min., and weighed 7,100 lbs. : in the test itwas run at 330 revolutions: Cnrrent, unfkm. I E. M. F., volU. Horse-power. Dynamometer,horse-power. Loss. Losses, frictionreversals. C2 R. EfUciency,per ceut. 134-81941371-6400 114115-698-3110 20-63014958-9 24-9735-354-564-7 445-25-55-8 4-44-53-54-1 0170-52]-301-50 82-585-289-991 The Bradley 3IuUipolar Dynamo.—The armature of this machine has the conductorswound upon it in one continuous course, so that the distance between each two successiveinduced portions of the conductors is greater or less than that between the poles of the field-magnets, according to the formula : n n D = d ; or. 7; = d. P P The inchiced current flows from one brush to the other through the whole svstem of con-du
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
