. A text-book of electrical engineering;. e come to the bottom of 20, from whence we passby a specicd connection to the bottom of 2, and reverse the direction roundthe winding. After passing through 2, 20, 14, 8 a special long connection,shown by the heavy line, connects across to the bottom of i, whence by19, 13, 7 we come to the end of the winding. This winding allows the end-connections to be arranged very conveniently; all those at the further endof the armature are exactly alike, and span the pole-pitch. This is also true 117- Stutor and Rotor Windings 111 of the front end, except, in the
. A text-book of electrical engineering;. e come to the bottom of 20, from whence we passby a specicd connection to the bottom of 2, and reverse the direction roundthe winding. After passing through 2, 20, 14, 8 a special long connection,shown by the heavy line, connects across to the bottom of i, whence by19, 13, 7 we come to the end of the winding. This winding allows the end-connections to be arranged very conveniently; all those at the further endof the armature are exactly alike, and span the pole-pitch. This is also true 117- Stutor and Rotor Windings 111 of the front end, except, in the present case, for two slightly longer con-nections, which are adjacent to the beginning and the end of the general, if there are <^ wires per coil-side, the winding will go round the stator or rotor — times in each direction, and the number of long end-con-nections will be q — 2. The other phases are wound in exactly the same way. The beginning ofphase II should be separated from that of phase 7 by f of the Fig- 387 but we can naturally start from the diametrically opposite but corre-sponding wire 17 instead of from 5. This is only true, of course, becausethis happens to be a four-pole winding. 118. The Magnetic Flux of an Induction Motor. In the present section we shall seek to prove that the magnetic field ofan induction motor has an approximately sinusoidal distribution. Moreover,we must calculate the magnetic flux produced by the stator and rotor cur-rents with the different types of windings. Fig. 388 represents diagram-matically a coil-winding with a large number of slots per coil-side. For thesake of clearness, the stator periphery is shown straight, and the coil-sidesare slightly separated from each other. The current in one phase is just atits maximum value, while in the other two it has half that value, as indicatedby the crosses and dots. 378 Electrical Engineering We see now that D is the centre of a north pole, while at the points Aa
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