IEEE Transactions on Magnetics vol:29 issue:2 pages:2032-2034
The distinction will be made between the vibrations produced by the fundamental current supplying the machine, and the much smaller higher harmonic currents, with frequencies ranging into the kilocycles range. The further discussion concentrates on the small harmonic currents. An appropriate mathematical modelling technique will be presented. A mechanical model is selected based on modal analysis techniques. A method is developed for finding the driving force for each mode shape. This is illustrated with measurements on a permanent magnet machine.