Salient-pole synchronous machines as claw-pole alternators (CPA) state most common energy converters in automotive applications for decades. For the sake of cost effectiveness, relatively low efficiency as well as a comparatively high radiation of acoustic noise is accepted. Increasing efforts to enhance output power on the one hand is accompanied by growing ecologic consciousness on the other hand, requiring the improvement of the machine design. Though design modifications, such as rotor claw chamfering, leads to a reduction of noise radiation, output power is reduced at the same time. This paper puts focus on the analysis of different stator winding configurations and their effect on body sound. The decrease of force exciting influences responsible for the noise at reasonable output power is aimed at. Varying the mutual displacement between two independent 3-phase systems placed in a stator of a regular claw pole alternator (forming a 6-phase system) allows for influencing amplitude and shape and therefore, the harmonic content of force exciting parameters such as current and flux linkage. A particular displacement angle is found featuring a minimum of body sound generation, yielding an acceptable level of the output power.
Reduction of force exciting influences to decrease radiation of acoustic noise in synchronous machines
2006
2 Seiten, 7 Bilder, 6 Quellen
Aufsatz (Konferenz)
Englisch
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