# 代做MEEK16104 ELECTRICAL MACHINES AND DRIVES Lab2代写Matlab语言

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MEEK16104

ELECTRICAL MACHINES AND DRIVES

Lab2

Design of DC motor speed control techniques using

Aim

The aim of this experiment is to design, simulate and compare the different speed control techniques of a DC motor.

Objectives

The main objectives are:

•   To design and simulate different speed control techniques of a DC motor. These techniques include three most common speed control methods, namely field resistance control, armature voltage control, and armature resistance control. The thyristorized techniques include using power electronic converters (Half converter, semi converter and full converter) to control the voltages.

•   Make a comparative analysis of the different speed controller techniques.

Equipment and Materials

Procedure

1. Find the input DC Motor in the component library of simulink, find the DC motor model, and drag it into the simulation interface, as shown in the following figure:

2. The selected DC motor parameters are shown in the figure below:

3. Build and analyze the following four simulation models: A, B, C, and D: A. The DC motor is directly connected to the resistance to start the control. The built simulation model is shown in the following figure:

The maximum load torque is calculated as follows:

Under different load torques, the speed conditions are simulated respectively, as shown in the following table:

 RF1=150Ω RF2=300Ω 1 1 379 553 2 2 377 548 3 4 373 540 4 5 371 535 5 6 369 531 6 8 365 522 7 9 363 518 8 10 361 513 9 12 357 505 10 13 355 500 11 14 353 496 12 16 349 487 13 18 345 478 14 20 340 469

The torque-speed characteristics of different field resistances are shown in the following figure:

The speed waveform. is shown in the following figure:

The current waveform. is shown in the following figure:

B. DC motor with armature voltage start control

The built simulink simulation model is shown in the following figure:

The maximum load torque is calculated as follows:

Under different armature voltages, the speed conditions are simulated respectively, as shown in the following table:

 No. Load torque (Nm) Rotor Speed (rad/s) Remarks VA1 = 240 V VA2 = 200 V VA3 = 300V 1 1 193 161 241 2 2 192 160 240 3 4 191 160 240 4 5 190 159 239 5 6 189 158 239 6 8 188 157 239 7 9 188 157 238 8 10 188 156 237 9 12 187 155 236 10 13 187 155 236 11 14 186 154 235 12 16 185 153 235 13 18 184 152 233 14 20 183 151 232

The torque-speed characteristics at different armature voltages are shown in the figure below:

The speed waveform. is as follows:

The current waveform. is as follows: