Lecture

DC Motor Demonstration

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In course

MICRO-314: Actuators and Electromagnetic systems II

Les étudiants seront capables de modéliser, de simuler et de mesurer des actionneurs électromagnétiques et des moteurs électriques. ...

Description

This lecture demonstrates a DC motor with separate excitation, showing how it operates and the effects of cutting off the excitation. By analyzing the motor's torque-speed characteristic, the instructor explains why the motor accelerates unexpectedly when the excitation is cut off, due to the remanence of ferromagnetic materials in the motor. The lecture also explores the consequences of this phenomenon, highlighting the risks of motor damage and dangerous situations that can arise from the motor accelerating uncontrollably.

In MOOC

Electromechanical conversion II

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 operating principles of electric motors, how to calculate their performance and the practical aspects of their use. The course comprises the following modules:

Rotating field and windings
Synchronous motor
DC motor
A

Instructors (3)

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

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

Ontological neighbourhood

Electrical engineering

Electronic engineering: Power electronics

Related concepts (18)

DC motor

A DC motor is an electrical motor that uses direct current (DC) to produce mechanical force. The most common types rely on magnetic forces produced by currents in the coils. Nearly all types of DC motors have some internal mechanism, either electromechanical or electronic, to periodically change the direction of current in part of the motor. DC motors were the first form of motors widely used, as they could be powered from existing direct-current lighting power distribution systems.

Brushed DC electric motor

A brushed DC electric motor is an internally commutated electric motor designed to be run from a direct current power source and utilizing an electric brush for contact. Brushed motors were the first commercially important application of electric power to driving mechanical energy, and DC distribution systems were used for more than 100 years to operate motors in commercial and industrial buildings. Brushed DC motors can be varied in speed by changing the operating voltage or the strength of the magnetic field.

Traction motor

A traction motor is an electric motor used for propulsion of a vehicle, such as locomotives, electric or hydrogen vehicles, or electric multiple unit trains. Traction motors are used in electrically powered railway vehicles (electric multiple units) and other electric vehicles including electric milk floats, trolleybuses, elevators, roller coasters, and conveyors, as well as vehicles with electrical transmission systems (diesel-electric locomotives, electric hybrid vehicles), and battery electric vehicles.

Ferromagnetism

Ferromagnetism is a property of certain materials (such as iron) that results in a significant, observable magnetic permeability, and in many cases, a significant magnetic coercivity, allowing the material to form a permanent magnet. Ferromagnetic materials are familiar metals that are noticeably attracted to a magnet, a consequence of their substantial magnetic permeability. Magnetic permeability describes the induced magnetization of a material due to the presence of an external magnetic field.

Remanence

Remanence or remanent magnetization or residual magnetism is the magnetization left behind in a ferromagnetic material (such as iron) after an external magnetic field is removed. Colloquially, when a magnet is "magnetized", it has remanence. The remanence of magnetic materials provides the magnetic memory in magnetic storage devices, and is used as a source of information on the past Earth's magnetic field in paleomagnetism. The word remanence is from remanent + -ence, meaning "that which remains".

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