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讲解 MEEK16104 ELECTRICAL MACHINES AND DRIVES Lab2辅导 Matlab语言

MEEK16104

ELECTRICAL MACHINES AND DRIVES

Lab2

Design of DC motor speed control techniques using

MATLAB/SIMULINK

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

MATLAB/SIMULINK software.

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:

No.

Load torque (Nm)

Rotor Speed (rad/s)

Remarks


 

 

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:


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