Lecture

Magnetic Energy

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In course

MICRO-313: Actuators and Electromagnetic systems I

Le cours aborde les principales méthodes pour l'analyse de systèmes électromécaniques. Une étude des grandeurs physiques magnétiques est suivie par la conversion de l'énergie électrique en énergie mécanique. L'aimant permanent est étudié de manière macrosc ...

Description

This lecture explores the concept of magnetic energy, demonstrating theoretically the process of storing energy in a transformer and calculating the magnetic energy in a coil. The instructor explains the equations for induced voltage, electrical power, and magnetic power, emphasizing the relationship between magnetic energy and inductance. The lecture concludes by relating magnetic energy to reactive power in electrical systems, highlighting the importance of creating and storing magnetic energy in coils. The audience is introduced to the calculation of magnetic energy in non-linear systems and complex geometries.

In MOOC

Electromechanical conversion I

Electric motors and actuators in general are part of our everyday lives, and can be found in both industrial and consumer applications: automobiles, household appliances, computers and even cell phones use electromechanical systems to create force or motion. This course covers the basic principles involved in the calculation, simulation and design of electromechanical systems such as actuators and electric motors. The course includes the following modules:

Magnetic circuits
Magnetic materials
Si

Instructors (2)

Christian Köchli

Teaching & PhD PhD Students Maël Dagon Past EPFL PhD Students as codirector Sebastiano Merzaghi, Chafic Abu Antoun, Florian Louis Copt, Sofia Lydia Ntella Courses Actuators and Electromagnetic systems I MICRO-313 The course covers the main methods for the analysis of electromechanical systems. A study of magnetic physical quantities is followed by the conversion of electrical energy into mechanical energy. The permanent magnet is studied macroscopically. The dynamic aspect of the system is

Yves Perriard

Yves Perriard was born in Lausanne in 1965. He received the M. Sc. in Microengineering from the Swiss Federal Institute of Technology - Lausanne (EPFL) in 1989 and the Ph D. degree in 1992. Co-founder of Micro-Beam SA, he was CEO of this company involved in high precision electric drive. Senior lecturer from 1998 and professor since 2003, he is currently director of Laboratory of Integrated Actuators. His research interests are in the field of new actuator design and associated electronic devices. In 2009, he is appointed Vice-Director of the Microengineering Institute in Neuchâtel until 2011. In 2013 the Federal Council has named him the the CTI commission in Bern. In 2014 he is appointed guest professor at Zhejiang University in China. In 2017, the lab is granted by the Werner Siemens Foundation of an amount of 12 millions CHF in order to set up a new Center for Artificial Muscules. Since 2018, he is Expert with Innosuisse, the new Swiss Innovation Agency. http://scholar.google.com/citations?hl=fr&user=V2onuO8AAAAJ https://actu.epfl.ch/news/a-12-million-franc-donation-to-create-a-center-for/

Official source

Quiz

Ontological neighbourhood

Electrical engineering

Power engineering: Electric power transmission

Related concepts (32)

Electric power

Electric power is the rate at which electrical energy is transferred by an electric circuit. The SI unit of power is the watt, one joule per second. Standard prefixes apply to watts as with other SI units: thousands, millions and billions of watts are called kilowatts, megawatts and gigawatts respectively. A common misconception is that electric power is bought and sold, but actually electrical energy is bought and sold.

Electrical engineering

Electrical engineering is an engineering discipline concerned with the study, design, and application of equipment, devices, and systems which use electricity, electronics, and electromagnetism. It emerged as an identifiable occupation in the latter half of the 19th century after the commercialization of the electric telegraph, the telephone, and electrical power generation, distribution, and use.

AC power

In an electric circuit, instantaneous power is the time rate of flow of energy past a given point of the circuit. In alternating current circuits, energy storage elements such as inductors and capacitors may result in periodic reversals of the direction of energy flow. Its SI unit is the watt. The portion of instantaneous power that, averaged over a complete cycle of the AC waveform, results in net transfer of energy in one direction is known as instantaneous active power, and its time average is known as active power or real power.

Magnetic circuit

A magnetic circuit is made up of one or more closed loop paths containing a magnetic flux. The flux is usually generated by permanent magnets or electromagnets and confined to the path by magnetic cores consisting of ferromagnetic materials like iron, although there may be air gaps or other materials in the path. Magnetic circuits are employed to efficiently channel magnetic fields in many devices such as electric motors, generators, transformers, relays, lifting electromagnets, SQUIDs, galvanometers, and magnetic recording heads.

Inductor

An inductor, also called a coil, choke, or reactor, is a passive two-terminal electrical component that stores energy in a magnetic field when electric current flows through it. An inductor typically consists of an insulated wire wound into a coil. When the current flowing through the coil changes, the time-varying magnetic field induces an electromotive force (emf) (voltage) in the conductor, described by Faraday's law of induction. According to Lenz's law, the induced voltage has a polarity (direction) which opposes the change in current that created it.

Related lectures (64)

Apparent and True Power: Transformer

Explains apparent and true power in circuits, power factor, transformers without load resistors, and transformers with load resistors.

Energy in Inductance & Capacitance

Explores energy storage in coils, magnetic fields, and capacitors, emphasizing the oscillation and decay of energy in circuits.

AC Circuits Analysis: Maxwell's Equations to Impedance

Explores AC circuits analysis, from Maxwell's equations to impedance and experimental phase shifts verification.

Energy Storage in Coils and Inductors

Explores energy storage in coils and inductors, emphasizing the role of inductance in storing magnetic energy and the impact of magnetic materials on inductance.

Electrical Networks: Phasor Diagrams and Reactive Power

Explores active and reactive losses in electrical networks using phasor diagrams.

Related concepts (32)

Electric power

Electrical engineering

AC power

Magnetic circuit

Inductor