MNdLE-KNKHMY TRANSIENTS.
'85
the permanent nnd the transient components of the three currents,
as is done in the preceding* Let tV, ly, ?y be the instantaneous
values of the permanent currents at the moment of clotting the
circuit, t «• 0. Combined, these would give the resultant field
OAg in Fig. 18* The three transient currents in this moment
are n0 v;j *"" *V» /s° *»—//» /«° ?«-«//, and combined those give a
resultant field 0//0| equal and opposite to (Mo in Fig. 18, The
permanent field rotates synchronously on the concentric circle a;
the transient field OH remains constant in the* direction Wi^
since all three transient components of current decrease in propor-
tion to each other, It- decreases, however, with the decrease of
the transient current, that in, nhrinkB together on the lino JiJ).
The resultant or actual field thus in the combination of the per-
manent fields, Hhowu an ()A\ fMa, . . . , and the transient fields,
shown as 0/ft, O/ia, <»toM and derived thereby by the parallelo-
gram law, an shown in Fig. IK, an (M\, 0(\ etc. In thin diagram,
&A» Wa» t»tc.« t^*1 (Hjual tt> (M|, fi4a, t»t.(t,, that is, to the radius
of the permanent, eirde «, That is, while the rotating field in
permanent condition in represented by the concentric circle a,
the resultant field during the trausieut or starting period IB repre-
sented by a Huoeossiou of ares of circles ef the centers of which
move from B« in the moment of start, on the lino B«0 toward 0,
and can bo constructed hereby by drawing from the successive
points #«, /ii, #g, which <»orrc*«i>oud t>o Huccessivo moments of
tinu* 0, ft, t% * . * i radii /ltCfif /l./^, et<%j tinder the angles, that is,
in the direction corresponding to the time 0, t\, ?a, etc. This is
done in Fig* 19, and thereby tho transient of the rotating field
as is done in the preceding* Let tV, ly, ?y be the instantaneous
values of the permanent currents at the moment of clotting the
circuit, t «• 0. Combined, these would give the resultant field
OAg in Fig. 18* The three transient currents in this moment
are n0 v;j *"" *V» /s° *»—//» /«° ?«-«//, and combined those give a
resultant field 0//0| equal and opposite to (Mo in Fig. 18, The
permanent field rotates synchronously on the concentric circle a;
the transient field OH remains constant in the* direction Wi^
since all three transient components of current decrease in propor-
tion to each other, It- decreases, however, with the decrease of
the transient current, that in, nhrinkB together on the lino JiJ).
The resultant or actual field thus in the combination of the per-
manent fields, Hhowu an ()A\ fMa, . . . , and the transient fields,
shown as 0/ft, O/ia, <»toM and derived thereby by the parallelo-
gram law, an shown in Fig. IK, an (M\, 0(\ etc. In thin diagram,
&A» Wa» t»tc.« t^*1 (Hjual tt> (M|, fi4a, t»t.(t,, that is, to the radius
of the permanent, eirde «, That is, while the rotating field in
permanent condition in represented by the concentric circle a,
the resultant field during the trausieut or starting period IB repre-
sented by a Huoeossiou of ares of circles ef the centers of which
move from B« in the moment of start, on the lino B«0 toward 0,
and can bo constructed hereby by drawing from the successive
points #«, /ii, #g, which <»orrc*«i>oud t>o Huccessivo moments of
tinu* 0, ft, t% * . * i radii /ltCfif /l./^, et<%j tinder the angles, that is,
in the direction corresponding to the time 0, t\, ?a, etc. This is
done in Fig* 19, and thereby tho transient of the rotating field
in coiiatracted.
Hf» 19* — Starting Tnuuteat of Rotating Welds Mar Form,