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

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter12: Power System Controls

Section: Chapter Questions

Problem 12.4P

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