A subsystem-based analytical method on characterizing the vibro-acoustics of high-speed brushless motors

Lin Ji, Roberto Faventi, John Lamb, Lukasz Kowalczyk

Research output: Contribution to conferencePaperpeer-review


Use of FEA models to assess the structural dynamics of a rotor dynamic system such as an electric motor is commonplace; this work demonstrates that the use of analytical models earlier in the design phase can be very effective to build understanding of the system even in complex cases. Missing the opportunity to use analytical models can slow down product development and limit the breadth of the design space evaluated. This work is focused on the use of analytical modeling, both in early stage development and later in the project cycle, and it demonstrates the usefulness and importance of lowfidelity models. A subsystem based analytical model was developed to simplify the vibro-acoustic prediction procedure for high-speed brushless motors. The approach is to divide the entire motor into three subassemblies; the rotor, the stator and the housing. These simplified subassemblies are individually modeled and connected via simple coupling elements. The model has been extensively validated by comparison with experimental results. Despite the inherent simplification required, the model has shown good agreement when investigating modification of motor components, and provided insight into complex coupling mechanisms. As a result, preliminary design proposals can be evaluated quickly and then passed to more expensive, higher fidelity FE tools with more certainty of a useful outcome. The model was also used to perform parametric studies evaluating the sensitivity of motor components to design changes. The validity and usefulness of analytical modeling techniques are demonstrated by modeling the dynamics of the latest high speed brush-less motor
Original languageEnglish
Publication statusPublished - 2017
Externally publishedYes
EventThe 24th International Congress on Sound and Vibration (ICSV) - London, United Kingdom
Duration: 23 Jul 201727 Jul 2017


ConferenceThe 24th International Congress on Sound and Vibration (ICSV)
Country/TerritoryUnited Kingdom


Dive into the research topics of 'A subsystem-based analytical method on characterizing the vibro-acoustics of high-speed brushless motors'. Together they form a unique fingerprint.

Cite this