Français
2. Permanent magnets
2.1 Context
A natural approach to measuring the characteristics of permanent magnets is to determine the magnetic moment of a sample through the force arising from its interaction with a field of known topology.
If we plunge a magnet, of magnetic moment m, shaped like a needle on a pivot or suspended from a wire, into a uniform magnetic field H, it takes on an orientation that results from balancing the torque moment τ = m × μ 0 H applied by the field with the opposite torque applied by a spring or the twisting wire. By letting the sample oscillate, we have a pendulum whose resonant frequency is directly related to m and the pendulum's moment of inertia. If the sample is...
The Ultimate Scientific and Technical Reference
This article is included in
Conversion of electrical energy
This offer includes:
Knowledge Base
Updated and enriched with articles validated by our scientific committees
Services
A set of exclusive tools to complement the resources
Practical Path
Operational and didactic, to guarantee the acquisition of transversal skills
Doc & Quiz
Interactive articles with quizzes, for constructive reading
Permanent magnets
Traceability and uncertainty of magnetic measurements
Also in our database
Bibliography
Events
Magnetic Measurements, biannual conference, Liptovsky'
Standards and norms
- Methods of measurement of the magnetic properties of electrical steel sheet and strip by means of an Epstein frame (IEC Central Office) - IEC Standard Publication 60404-2 - 1996
- Methods of measurement of magnetic properties magnetic sheet and strip by means of a single sheet tester (IEC Central Office) - IEC Standard Publication 60404-3 - 1988
- Methods of measurement of the dc magnetic properties of magnetically...
Directory
Organizations – Federations – Associations (non-exhaustive list)
EURAMET European Association of National Metrology Institutes (successor to EUROMET since July 2007) http://www.euramet.org/
BIMP Bureau International des Poids et Mesures http://www.bipm.org/fr/home/
...
The Ultimate Scientific and Technical Reference
