The purpose of this work was to investigate a permanent magnet synchronous machine
which will be produced by an industry partner of the Institut für Stromrichtertechnik und
Elektrische Antriebe (ISEA) an institute of the Rheinisch Westfälisch Technische
Hochschule - Aachen, Germany (RWTH).
The machine manufacturer noted certain abnormalities with the frequency spectrum
produced by an electric machine that they were developing; this problem was brought to
ISEA in order to be investigated. My work continues the work of my supervisor, Dipl.-
Ing Matthias Bösing, and seeks to further examine the machine for a much wider range
of operating points, determine the relationship between current amplitude, harmonics,
control angle and rotor position on radial force components of the machine and therefore
stresses on the stator; which are the primary causes of electrical machine noise. Rather
than investigate acoustic issues in particular, the study was limited to the study of
electromagnetically generated radial force ripple, which is the cause of stator deflection
modes and therefore the emission of sound waves.
The primary results of this thesis researched the operation of a permanent magnet
synchronous machine and described its behavior with regards to force, torque, and force
and torque ripple and their spectrums versus numerous parameters, including control
angle, secant current and rotor position. Next, the work used provided data, literature
and the simulation results for this thesis in order to deconstruct the operation regions of the particular machine and therefore link the causes of particular noise spectral
components to the operation of the machine. From this it was possible to identify
potential ways to eliminate these areas of noise. Following this, the thesis examined a
particular abnormality in the torque and force waveforms produced by the machine and
devised actions which could correct this abnormality. After identifying this asymmetry,
the work explored how to choose an optimal control strategy for eliminating particular
harmonics based on the simulated operating points and a desired command torque.
Finally, the research built on the previous work by supplementing the method of current
harmonic injection for eliminating radial force harmonics in this machine, with a method
of determining an optimal operating point before the injection currents are calculated.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/ETD-TAMU-2718 |
| Date | 15 May 2009 |
| Creators | Doolittle, Randy Gene |
| Contributors | Ehsani, Mehrdad |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Thesis, text |
| Format | electronic, application/pdf, born digital |
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