2023
Electrical Machines
Name: Electrical Machines
Code: EME13013L
6 ECTS
Duration: 15 weeks/156 hours
Scientific Area:
Electrotechnical Engineering
Teaching languages: Portuguese
Languages of tutoring support: Portuguese
Regime de Frequência: Presencial
Sustainable Development Goals
Learning Goals
Students will obtain useful skills to understand the Electrical Machines basic functioning principles, particularly related with electromechanical energy conversion. They will know the main characteristics of electrical machines different types. To know how to specify them for each application field. Students will also acquire competences that will allow them to pursuit and increase their studies and knowledge.
Contents
1. Introduction to the study of Electrical Machines
Electromagnetic concepts and circuit analysis revisited.
Principles of electromechanical energy conversion.
2. Transformer
One-phase transformer.
Three-phase transformer.
Special transformers. The self-transformer. Measurement transformers.
3. DC Machines
Introduction and functioning principles. Generator functioning. Main characteristics. Application fields.
Motor functioning. Main characteristics. Application fields.
4. Asynchronous Machine.
Constructive aspects and functioning principles.
Three-phase induction machine.
One-phase induction machine.
5. Synchronous Machine.
Constructive aspects and functioning principles.
Generator study.
Synchronous motor.
6. Small motors
DC motors. Servomotor. Stepper motors.
Pulse Width Modulation (PWM). H bridges. Encoders.
Speed, direction and position control using microcontrollers.
Electromagnetic concepts and circuit analysis revisited.
Principles of electromechanical energy conversion.
2. Transformer
One-phase transformer.
Three-phase transformer.
Special transformers. The self-transformer. Measurement transformers.
3. DC Machines
Introduction and functioning principles. Generator functioning. Main characteristics. Application fields.
Motor functioning. Main characteristics. Application fields.
4. Asynchronous Machine.
Constructive aspects and functioning principles.
Three-phase induction machine.
One-phase induction machine.
5. Synchronous Machine.
Constructive aspects and functioning principles.
Generator study.
Synchronous motor.
6. Small motors
DC motors. Servomotor. Stepper motors.
Pulse Width Modulation (PWM). H bridges. Encoders.
Speed, direction and position control using microcontrollers.
Teaching Methods
The teaching method is based on theoretical, practical and laboratory classes. The objective of the practical classes is to consolidate the knowledge acquired in the theoretical classes. The laboratory classes place emphasis on the prediction of the experimental results using the models introduced in the theoretical classes.
Student tutoring available outside the 2 times per week. Email and Zoom available for basic questions.
Student tutoring available outside the 2 times per week. Email and Zoom available for basic questions.
Assessment
Assessment elements are classified using the range [0,20].
The Assessment elements are as follows:
• [L] Laboratory Component - Minimum grade of 9.5 (30%)
• [F1] Test 1 - Minimum grade of 8.0 (23.333%)
• [F2] Test 2 - Minimum grade of 8.0 (23.333%)
• [F3] Test 3 - Minimum grade of 8.0 (23.333%)
• [Ex] Final exam (70%)
The student can choose 1 of 2 possible Assessment regimes, in which the Final Grade [NF] is calculated as follows:
i) CONTINUOUS EVALUATION: NF = (F1 + F2 + F3)/3 × 0.7 + L × 0.3
Approved if NF>= 9.5
Failed if NF < 9.5
ii) FINAL ASSESSMENT: NF = Ex × 0.7 + L × 0.3
Approved if NF>= 9.5
Failed if NF < 9.5
The Assessment elements are as follows:
• [L] Laboratory Component - Minimum grade of 9.5 (30%)
• [F1] Test 1 - Minimum grade of 8.0 (23.333%)
• [F2] Test 2 - Minimum grade of 8.0 (23.333%)
• [F3] Test 3 - Minimum grade of 8.0 (23.333%)
• [Ex] Final exam (70%)
The student can choose 1 of 2 possible Assessment regimes, in which the Final Grade [NF] is calculated as follows:
i) CONTINUOUS EVALUATION: NF = (F1 + F2 + F3)/3 × 0.7 + L × 0.3
Approved if NF>= 9.5
Failed if NF < 9.5
ii) FINAL ASSESSMENT: NF = Ex × 0.7 + L × 0.3
Approved if NF>= 9.5
Failed if NF < 9.5
Teaching Staff
