Lecture

Electric Machines: Asynchronous Machine Principles

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In course

EE-361: Electrical machines (for EL)

L'objectif de ce cours est d'acquérir les connaissances de base liées aux machines électriques (conversion électromécanique). Le cours porte sur le circuit magnétique, le transformateur, les machines synchrones, asynchrones, à courant continu et les moteur ...

Description

This lecture covers the principles of asynchronous machines, also known as induction machines. It begins with an introduction to the basic concepts and definitions, including the characteristics of the magnetic circuit and torque. The instructor explains the structure of the asynchronous machine, detailing the stator and rotor configurations, including the squirrel cage and wound rotor types. The functioning principle is elaborated, emphasizing the relationship between the rotating magnetic field and the rotor's speed. The concept of slip, which is the difference in speed between the rotor and the magnetic field, is introduced, along with its significance in torque generation. The lecture also discusses the equivalent circuit of the asynchronous machine, including parameters such as resistance and reactance. The instructor highlights the importance of understanding the power balance and the impact of starting methods on performance. Throughout the lecture, practical examples and visual aids are used to enhance comprehension of the theoretical concepts presented.

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Instructor

André Hodder

Teaching & PhD PhD Students Lucien André Félicien Pierrejean Past EPFL PhD Students as codirector Simone Rametti Courses Actuators and Electromagnetic systems II MICRO-314 The students will be able to model, simulate and measure actuators and electrical motors Advanced lab in electrical energy systems EE-588 Pre-requisites required. The number of places is limited. Please register only after having obtained the teacher's agreement. The purpose of this teaching lab is to put

Official source

Ontological neighbourhood

Electrical engineering

Electronic engineering: Power electronics

Physics

Electromagnetism: Electrical networks

Related concepts (31)

Electric machine

In electrical engineering, electric machine is a general term for machines using electromagnetic forces, such as electric motors, electric generators, and others. They are electromechanical energy converters: an electric motor converts electricity to mechanical power while an electric generator converts mechanical power to electricity. The moving parts in a machine can be rotating (rotating machines) or linear (linear machines).

Induction motor

An induction motor or asynchronous motor is an AC electric motor in which the electric current in the rotor needed to produce torque is obtained by electromagnetic induction from the magnetic field of the stator winding. An induction motor can therefore be made without electrical connections to the rotor. An induction motor's rotor can be either wound type or squirrel-cage type. Three-phase squirrel-cage induction motors are widely used as industrial drives because they are self-starting, reliable, and economical.

Electric motor

An electric motor is an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor's shaft. An electric generator is mechanically identical to an electric motor, but operates with a reversed flow of power, converting mechanical energy into electrical energy.

LC circuit

File:LC parallel simple.svg|LC circuit diagram File:Low cost DCF77 receiver.jpg|LC circuit ''(left)'' consisting of ferrite coil and capacitor used as a tuned circuit in the receiver for a [[radio clock]] File:Tuned circuit of shortwave radio transmitter from 1938.jpg|Output tuned circuit of [[shortwave]] [[radio transmitter]] An LC circuit, also called a resonant circuit, tank circuit, or tuned circuit, is an electric circuit consisting of an inductor, represented by the letter L, and a capacitor, represented by the letter C, connected together.

Doubly fed electric machine

Doubly fed electric machines, also slip-ring generators, are electric motors or electric generators, where both the field magnet windings and armature windings are separately connected to equipment outside the machine. By feeding adjustable frequency AC power to the field windings, the magnetic field can be made to rotate, allowing variation in motor or generator speed. This is useful, for instance, for generators used in wind turbines.

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