Lecture #4 Rotating field in AC machines la = Imcos(wt) In = Imcos(wt + 120) Ic = Imcos(wt – 120) %3D b' Im La Ic wt = 0 ot = 60 wt a -Im wt = 120 wt = 60: wt = 120 wt = 0 Dr. Ali Karimpour Mar 2021 Torque determination in cylindrical AC Machine (Electromagnetic view point) Lecture #4 e = 0 la = Imcos(wt) Ib = ImCos(wt + 120) H¸ = KNa Im cos(0 – wt) T 2g %3D Im7 cos(0 – wt) %3D Ic = Imcos(wt – 120) e = 0 Q1: What does happen if we change two currents?
Lecture #4 Rotating field in AC machines la = Imcos(wt) In = Imcos(wt + 120) Ic = Imcos(wt – 120) %3D b' Im La Ic wt = 0 ot = 60 wt a -Im wt = 120 wt = 60: wt = 120 wt = 0 Dr. Ali Karimpour Mar 2021 Torque determination in cylindrical AC Machine (Electromagnetic view point) Lecture #4 e = 0 la = Imcos(wt) Ib = ImCos(wt + 120) H¸ = KNa Im cos(0 – wt) T 2g %3D Im7 cos(0 – wt) %3D Ic = Imcos(wt – 120) e = 0 Q1: What does happen if we change two currents?
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Transcribed Image Text:Lecture #4
Rotating field in AC machines
la
Im cos(wt)
In = Imcos(wt + 120)
Ic = Imcos(wt – 120)
%3D
Im
Ic
C
wt = 0
ot = 60
wt
a
-Im
wt = 120
wt = 60:
wt = 0
wt = 120
Dr. Ali Karimpour Mar 2021
Lecture #4
Torque determination in cylindrical AC Machine (Electromagnetic view point)"
e = 0
la = Imcos(wt)
Im cos(wt + 120)
4 kwNa
H
Ih =
T 2g
Im7 cos(0 – wt)
a' O
Ic = Imcos(wt – 120)
e = 0
Q1: What does happen if we change two currents?
Q2: What does happen if we have a three-phase four poles machine?
Q3: What does happen if we have a two-phase two poles machine?
e = 0
Q4: What does happen if we apply a capacitance in phase b and then use same
voltage for both phase.
Dr. Ali Ka....p. -
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