b) The speed of a separately excited motor is controlled by a single-phase semiconverter in Figure 1. The field current, which is also controlled by a semiconverter, is set to the maximum possible value. The ac supply voltage to the armature and field converters is single phase, 220 V, 60 Hz. The armature resistance, R,- 0.3 2, the field resistance, Re= 170 2, and the motor voltage constant, Ky 0.71 V/A rad/s. The load torque, TL - 60NM at 1100 rpm. The viscous friction and no-load losses are negligible. The inductances of the armature and field circuit are sufficient enough to make armature and field currents continuous and ripple free. Calculate; i the field current I. ii. the delay angle of the converter in the armature circuit a, and iii. the input power factor (PF) of the armature circuit converter. i, A F1 La R. Rf M 本 卒a F2 A2 本
b) The speed of a separately excited motor is controlled by a single-phase semiconverter in Figure 1. The field current, which is also controlled by a semiconverter, is set to the maximum possible value. The ac supply voltage to the armature and field converters is single phase, 220 V, 60 Hz. The armature resistance, R,- 0.3 2, the field resistance, Re= 170 2, and the motor voltage constant, Ky 0.71 V/A rad/s. The load torque, TL - 60NM at 1100 rpm. The viscous friction and no-load losses are negligible. The inductances of the armature and field circuit are sufficient enough to make armature and field currents continuous and ripple free. Calculate; i the field current I. ii. the delay angle of the converter in the armature circuit a, and iii. the input power factor (PF) of the armature circuit converter. i, A F1 La R. Rf M 本 卒a F2 A2 本
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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Transcribed Image Text:b) The speed of a separately excited motor is controlled by a single-phase semiconverter in
Figure 1. The field current, which is also controlled by a semiconverter, is set to the
maximum possible value. The ac supply voltage to the armature and field converters is single
phase, 220 V, 60 Hz. The armature resistance, R, = 0.3 N, the field resistance, R = 170 2.
and the motor voltage constant, Ky = 0.71 V/A rad/s. The load torque, TL = 60NM at
1100 rpm. The viscous friction and no-load losses are negligible. The inductances of the
armature and field circuit are sufficient enough to make armature and field currents
continuous and ripple free. Calculate;
i. the field current Ir,
ii. the delay angle of the converter in the armature circuit a, and
iii. the input power factor (PF) of the armature circuit converter.
in A1
F
La
R.
Vs
Rf
M
Aia
A2
F2
Figure 1
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