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Electrical drives for eMobility

02TVTLO

A.A. 2021/22

2021/22

Electrical drives for eMobility

The course aims at providing to the students the basic concepts of the electrical energy conversion systems employed in transportation electrification, with a particular focus on hybrid and electrical vehicles. The systems under study will be the electrical drives for powertrains and the battery chargers. The electrical motors belong to the new generations of eMotors dedicated to electrical traction, such as induction motors, synchronous reluctance motors and internal permanent magnet motors. The course will provide also the basic concepts of vector control of traction drives, along with testing techniques to obtain efficiency maps and torque production maps.

Electrical drives for eMobility

The course aims at providing to the students the fundamental concepts of the electrical energy conversion systems employed in transportation electrification, with a particular focus on hybrid and electrical vehicles. The systems under study will be the electrical drives for powertrains (traction battery, inverter, eMotor) and the battery charging systems along with the related infrastructure for the connection of the vehicles to the grid. The electrical motors belong to the new generations of eMotors dedicated to electrical traction, such as surface mount permanent magnet motors (SMPM), induction motors (IM), internal permanent magnet motors (IPM), and PM-assisted synchronous reluctance motors (PM-SyR). Using a systemic approach, the course will focus on energetic simulation models of all elements of a powertrain able to consider the efficiency maps of each element and the specific limitations acting on the generated torque. The course will provide also the basic concepts of vector control of traction drives.

Electrical drives for eMobility

Capability to understand the structure of a traction electrical drive consisting of a power electronic converter and an electrical machine. Ability to compare different electric drive solutions based on different motor technologies. Capacity to design or to tune the control loops (torque, current, speed) of an electric drive.

Electrical drives for eMobility

• Capability to understand the structure of a traction electrical drive consisting of battery, power electronic converters and electrical machines. • Capability to understand the technologies used for the power electronic switches and their packaging. • Ability to compare different electric drive solutions based on different motor technologies. • Ability to provide the right specifications for the components of an electrical powertrain, according to the vehicle specifications. • Capacity to develop or use proper simulation models for the simulation of power converters and eMotors that must be embedded in larger vehicle models.

Electrical drives for eMobility

Fundamentals in electrical circuits, electrical machines, automatic control or the basic concepts in systems theory.

Electrical drives for eMobility

Fundamentals in electrical circuits, electrical machines, automatic control or the basic concepts in systems theory.

Electrical drives for eMobility

• Introduction: general description of an electric drive • Power electronic devices used in power electronic converters • Basic operation principles of a switch-mode power electronic converter. Canonical commutation cell. • DC/DC converters for eMobility. • DC / AC converters (inverters) for eMobility. • Electrical motor solutions for eMobility: induction motor, synchronous reluctance motor, internal permanent magnet motor • Fundamental concepts of vector control for AC motors fed by inverters • Vector control of eDrives: design of the drive control loops (current, speed and position). • Implementation issues of high performance vector control of eMotors: Maximum Torque per Ampere (MTPA), Maximum Torque per Volt (MTPV), torque estimation, computation of maximum torque according to the voltage and current limits • Advanced testing of eDrives. • Battery chargers: on-board and off-board solutions.

Electrical drives for eMobility

• Introduction: definition of eMobility and presentation of most generic structure of an eDrive • eDrives for Architectures of Hybrid and Electrical Vehicles • Energy sources for eMobility: batteries, ultracapacitors, fuel-cells • Fundamental concepts of power converters: classification, switch-mode power converters, canonical switching cell, inductors and capacitors • Power electronic devices used in power electronic converters: diode, MOSFET, IGBT, WBG devices, packaging solutions and thermal modeling • AC-DC converters for eMobility • DC/DC converters for eMobility. • DC / AC converters (inverters) for eMobility. • Electrical motor solutions for eMobility: induction motor, synchronous reluctance motor, internal permanent magnet motor • Fundamental concepts of torque control for eMotors • Fundamental concepts of the control of power converters and eDrive • Fundamental concepts of vector control of AC machines • Classification of e-motor solutions and torque production of AC e-motors • Vector control of AC motors for eMobility • Battery chargers: on-board and off-board solutions.

Electrical drives for eMobility

Electrical drives for eMobility

Electrical drives for eMobility

In addition to classroom lectures, laboratory activities are planned. The laboratory exercises concern the analysis of the operation of an electric drive with internal permanent magnet motor.

Electrical drives for eMobility

In addition to classroom lectures presenting theoretical concepts, the following exercise activities are planned: • Battery modeling and simulation using solutions available on electrical vehicles. • Inverter simulation using circuital models and dynamic average models. • Laboratory exercise on a three-phase inverter. • Electrical motors modeling and simulation. • Laboratory exercise on an eMotor fed by inverter and using torque control.

Electrical drives for eMobility

• Neil Storey “Electronics: a system approach”, Pearson Education • T.L. Floyd “Electronic Devices”, Prentice Hall • Ned Mohan, Tore Undeland, Tim Robbins, "Elettronica di Potenza", Edizioni Hoepli • Rashid, M. H., 'Elettronica di Potenza', Prentice Hall • John Kassakian, Marting F. Schlecht, George V. Verghese, “Principles of Power Electronics”, Pearson Education.

Electrical drives for eMobility

• Rashid, M. H., 'Elettronica di Potenza', Prentice Hall • Ali Emadi, "Advanced Electric Drive Systems", CRC Press, 2014. • Chris Mi, “Hybrid Electric Vehicles”, John Wiley&Sons, 2018.

Electrical drives for eMobility

Modalità di esame: Prova scritta (in aula);

Electrical drives for eMobility

The exam consists of a written test of 150 minutes, containing multiple choice questions (24 points) and a question with open answer (6 points). During the exam, the use of books, notes or equivalent materials is not allowed. In addition, during the teaching students will be given a report to be elaborated at home, regarding the sizing of an electric drive and the design of the its torque control scheme. The report is rated up to 30 points. The final score is calculated as the weighted arithmetic mean between the written test (80%) and the score obtained for the report (20%). The rules of examination are described and discussed during the introductory class.

Electrical drives for eMobility

Exam: Written test;

Electrical drives for eMobility

The exam consists of a written test of 150 minutes, containing multiple choice questions (24 points) and a question with open answer (6 points). During the exam, the use of books, notes or equivalent materials is not allowed. The rules of examination are described and discussed during the introductory class.

Electrical drives for eMobility

Modalità di esame: Prova scritta a risposta aperta o chiusa tramite PC con l'utilizzo della piattaforma di ateneo Exam integrata con strumenti di proctoring (Respondus); Elaborato progettuale in gruppo;

Electrical drives for eMobility

The exam consists of a written test of 150 minutes, containing multiple choice questions (24 points) and three fast numerical computations (6 points). During the exam, the use of books, notes or equivalent materials is not allowed. In addition, during the teaching students will be given a report to be elaborated at home, regarding the sizing of an electric drive and the design of the its torque control scheme. The report is rated up to 30 points. The final score is calculated as the weighted arithmetic mean between the written test (80%) and the score obtained for the report (20%). The rules of examination are described and discussed during the introductory class.

Electrical drives for eMobility

Exam: Computer-based written test with open-ended questions or multiple-choice questions using the Exam platform and proctoring tools (Respondus); Group project;

Electrical drives for eMobility

The exam consists of a written test of 150 minutes, containing multiple choice questions (26 points) and three fast numerical computations (6 points). During the exam, the use of books, notes or equivalent materials is not allowed. The rules of examination are described and discussed during the introductory class.

Electrical drives for eMobility

Modalità di esame: Elaborato scritto prodotto in gruppo; Prova scritta a risposta aperta o chiusa tramite PC con l'utilizzo della piattaforma di ateneo Exam integrata con strumenti di proctoring (Respondus);

Electrical drives for eMobility

The exam consists of a written test of 150 minutes, containing multiple choice questions (24 points) and three fast numerical computations (6 points). During the exam, the use of books, notes or equivalent materials is not allowed. In addition, during the teaching students will be given a report to be elaborated at home, regarding the sizing of an electric drive and the design of the its torque control scheme. The report is rated up to 30 points. The final score is calculated as the weighted arithmetic mean between the written test (80%) and the score obtained for the report (20%). The rules of examination are described and discussed during the introductory class.

Electrical drives for eMobility

Exam: Group essay; Computer-based written test with open-ended questions or multiple-choice questions using the Exam platform and proctoring tools (Respondus);

Electrical drives for eMobility

The exam consists of a written test of 150 minutes, containing multiple choice questions (24 points) and three fast numerical computations (6 points). During the exam, the use of books, notes or equivalent materials is not allowed. The rules of examination are described and discussed during the introductory class.

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