Electrical machines

5-year combined undergraduate / graduate Engineering programs

General Data
Academic program	General Engineering Program			:
Type d'EC	Classes
Lectures : 14h00 Tutorials : 4h00 Lab Work : 8h00 Total duration : 41h00	Status :	Period : SEMESTER 6	Education language : French

Learning Outcomes
- Master the physical principles in place in electrical machines (law of electromagnetism, Laplace force, etc.) - Know the constitution of rotating electrical machines: Direct Current Machines, Synchronous Machine, Induction Machine (mechanical parts, name of electrical windings, specific vocabulary) - Master the technical characteristics and the limits of use of the 3 rotating electrical machines mentioned above (torque-speed characteristics, typical efficiency, operating points, operation as a generator) - -Know the circuit model of the 3 rotating machines mentioned above and know how to use them to calculate the operating points and determine the energy efficiency. - Know the major applications of each family: lifting, energy production, mobility….

Learning Outcomes

- Master the physical principles in place in electrical machines (law of electromagnetism, Laplace force, etc.)
- Know the constitution of rotating electrical machines: Direct Current Machines, Synchronous Machine, Induction Machine (mechanical parts, name of electrical windings, specific vocabulary)
- Master the technical characteristics and the limits of use of the 3 rotating electrical machines mentioned above (torque-speed characteristics, typical efficiency, operating points, operation as a generator)
- -Know the circuit model of the 3 rotating machines mentioned above and know how to use them to calculate the operating points and determine the energy efficiency.
- Know the major applications of each family: lifting, energy production, mobility….

Content
Introduction to rotating machines: definition of an electromechanical converter, illustration, general description of machines, reminder of electromagnetic laws (Laplace, Lenz-Faraday) demonstration of the creation of an electromotive force and a torque in a simplified structure. The direct current machine: description, particularity of design of the electrical contacts by brush-collectors. Reversibility of the machine. Separate excitation, shunt and series modes: description of the circuit model and plot of torque and speed characteristics as a function of armature voltage and current. The synchronous machine: description, comparison of a wound rotor machine with permanent magnets. Demonstration of obtaining the circuit model. Description of different models of the synchrone machine: linear, Behn-Eschenburg and Potier. Implementation of synchronous machines: connection to the network. The Induction machine: description, Demonstration of obtaining the circuit model. Plot of the torque-slip and speed torque characteristic. Openness to the use of electric machines in energy production. Conference on the adequacy of primary energy - type of turbine - type of electrical machine Tutorials : - Study of direct current and asynchronous motors in railway traction, the case of TGV - Comparison of linear and Behn-Eschenburg models for the calculation of an operating point of a synchronous alternator. Practical work: - Coupled system of a DC motor and a synchronous alternator - Study of the MAS characteristics

Content

Introduction to rotating machines: definition of an electromechanical converter, illustration, general description of machines, reminder of electromagnetic laws (Laplace, Lenz-Faraday) demonstration of the creation of an electromotive force and a torque in a simplified structure.

The direct current machine: description, particularity of design of the electrical contacts by brush-collectors. Reversibility of the machine. Separate excitation, shunt and series modes: description of the circuit model and plot of torque and speed characteristics as a function of armature voltage and current.

The synchronous machine: description, comparison of a wound rotor machine with permanent magnets. Demonstration of obtaining the circuit model. Description of different models of the synchrone machine: linear, Behn-Eschenburg and Potier. Implementation of synchronous machines: connection to the network.

The Induction machine: description, Demonstration of obtaining the circuit model. Plot of the torque-slip and speed torque characteristic.

Openness to the use of electric machines in energy production. Conference on the adequacy of primary energy - type of turbine - type of electrical machine

Tutorials :
- Study of direct current and asynchronous motors in railway traction, the case of TGV
- Comparison of linear and Behn-Eschenburg models for the calculation of an operating point of a synchronous alternator.

Practical work:
- Coupled system of a DC motor and a synchronous alternator
- Study of the MAS characteristics

Pre-requisites / co-requisites
- Single-phase and three-phase electrical networks - Magnetic circuits - Transformers - The complex formalism applied to electricity - Signal concepts (Fundamental, harmonic, Fourier series, etc.) - Know the general rules of electricity, Ohm's law, superposition theorem ....

Bibliography
At the library : Theodore Wildi, Electrotechnique, 2015. J. Chatelain, Machines électriques, Tome 1, Dunod

Assessment(s)
N°	Nature	Coefficient	Observable objectives
1	Demonstrate technical knowledge of asynchronous and direct-current machines using simplified rules for torque, speed, efficiency calculation as well as their common applications.	0,667	Written exam
2	- Wire and handle on: Asynchronous motor coupled with another mechanical electric machine DC machine coupled to another electrical mechanical system (Synchronous machine or DC generator) - Conduct experimental surveys by using measuring devices and plot the characteristic curves - Identify equivalent models - Check the area of validity of the proposed models	0,333	Practical work