This document presents simulation results for a closed-loop 1-phase AC to DC converter fed speed controlled DC drive using a separately excited DC motor. The simulation was run under different load torques of 5 Nm, 20 Nm, and 30 Nm. The results show that as load torque increases, motor speed decreases while armature current and electrical torque increase. During starting, armature current is very high before stabilizing at the rated speed. The field flux is constant for the separately excited DC motor and output parameters are displayed in waveforms and tables over time.

1. Shri Ramdeobaba College of Engineering & Management
Department of Electrical Engineering
Topic : Close Loop 1-Phase AC to DC Converter Fed Speed
Controlled DC Drives (Use Separately Excited DC Motor)
Subject : ADVANCED DRIVES
Assignment
Presented By-
Name : Sheikh Mohammad Sajid
Roll No. : 07
Branch : M Tech (PEPS)
2nd Semester

2. Close Loop 1-Phase AC to DC Converter Fed Speed Controlled DC Drives (Use
Separately Excited DC Motor)
Simulink Model:

5. Load Torque,TL=5 Nm
Time in Sec Speed in rpm Armature
current in Amps
Electrical
Torque in Nm
Armature
Voltage in Volts
At t=0 sec 256.9 rpm 63.9 Amps 64.63 Nm 192.6 V
At t=0.3 sec 1622 rpm 10.4 Amps 10.6 Nm 11.76 V
At t=0.5 sec 1800 rpm 5.6 Amps 5.66 Nm 12.17 V
At t=1 sec 1872 rpm 4.04 Amps 4.08 Nm 12.49 V
Load Torque,TL=20 Nm
Time in Sec Speed in rpm Armature
current in Amps
Electrical
Torque in Nm
Armature
Voltage in Volts
At t=0 sec 149.1 rpm 65.97 Amps 66.72 Nm 192.2 V
At t=0.3 sec 1263 rpm 24.79 Amps 25.08 Nm 11.63 V
At t=0.5 sec 1393 rpm 20.47 Amps 20.7 Nm 11.83 V
At t=1 sec 1397 rpm 20.3 Amps 20.53 Nm 11.82 V

6. Load Torque,TL=30 Nm
Time in Sec Speed in rpm Armature
current in Amps
Electrical
Torque in Nm
Armature
Voltage in Volts
At t=0 sec 77.81 rpm 67.24 Amps 68.01 Nm 118.7 V
At t=0.3 sec 1047 rpm 33.45 Amps 33.83 Nm 11.6 V
At t=0.5 sec 1136 rpm 30.52 Amps 30.86 Nm 11.78 V
At t=1 sec 1138 rpm 30.28 Amps 30.62 Nm 11.7 V

7. Observation:
•Field Flux is constant for separately Excited DC motor.
•Load Torque is consider to be contant for particular load .
•Output parameter is shown in waveform and tabular form.
•During starting of motor the armature current(Ia) is very
high.Therefore to stop this current we use starter during
starting period.
•Speed of motor is low during starting.
•At running condition speed of motor is constant as per given
condition.
•Speed of motor drops with increase in load torque(TL).
•Armature current(Ia) and Electrical torque(TE) increases with
load torque(TL).