PERMANENTLY EXCITED ELECTRICAL MACHINE
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United States of America Patent
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Issued Date -
Dec 16, 2010
app pub date -
Nov 12, 2008
filing date -
Nov 15, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The invention relates to a permanently-excited electrical machine with a stator and a rotor. The stator has a coil arrangement and the rotor is provided with permanent magnet elements, or the rotor comprises a coil arrangement and the stator is provided with permanent magnet elements. An air gap is formed between the stator and the rotor, which is defined by the permanent magnet elements and magnetically conductive teeth of the stator, which are aligned with these in certain positions. The coil arrangement comprises at least one hollow cylindrical winding which is at least partially accommodated in the stator. The rotor has a magnetic return on the sides of the permanent magnet elements, which are remote from the air gap. The magnetic return is formed of rings which are oriented in the circumferential direction of the rotor, and which in the axial direction of the rotor are not wider than individual ones of the permanent magnet elements. Electrically/magnetically effective short-circuit coils are arranged between neighbouring permanent magnet elements in the axial direction of the electrical machine and/or neighbouring magnetic return rings in the axial direction.
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