3. Prediction of audible magnetic noise
Using expressions for magnetic line frequencies, simple graphical tools can be used to predict the appearance of resonances in the variable regime. If you want to obtain an estimate of the noise level, numerical simulation is essential. In both cases, it is necessary to calculate the main natural frequencies of the machine, which can be done using finite element software or analytically. As stated in the introduction, analytical methods are favored here for their computational speed, which enables noise to be simulated in variable regime and the model to be coupled with optimization tools.
3.1 Analytical calculation of natural frequencies
The natural frequencies of the machine's radial modes can be calculated analytically by assimilating it to a ring. We propose...
Exclusive to subscribers. 97% yet to be discovered!
You do not have access to this resource.
Click here to request your free trial access!
Already subscribed? Log in!
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
Prediction of audible magnetic noise
Bibliography
Bibliography
Standards and norms
- Electric drive – Rotating electrical machines for rail and road vehicles – Part 2: AC motors powered by electronic converters - CEI 60349-2 - 2010
- Machines électriques tournantes. Partie 9 : Limites de bruits - CEI 60034-9 - 2007
- Rotating electrical machines. Part 14: Mechanical vibration of certain machines with shaft heights greater than or equal to 56 mm. – Vibration measurement, assessment and limits...
Patents
Process for the electrolytic oxidation of cerium and electrolysis unit for its implementation CA2582058
Exclusive to subscribers. 97% yet to be discovered!
You do not have access to this resource.
Click here to request your free trial access!
Already subscribed? Log in!
The Ultimate Scientific and Technical Reference