Permanent magnet module for an electrical machine
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United States of America Patent
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Dec 3, 2013
Grant Date -
Nov 24, 2011
app pub date -
Dec 8, 2009
filing date -
Dec 17, 2008
priority date (Note) -
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Abstract
A permanent magnet module for a rotor of a permanent magnet electrical machine is presented. The permanent magnet module comprises: a stack of ferromagnetic steel sheets (104) having a groove in the direction perpendicular to the ferromagnetic steel sheets, and a permanent magnet (105) located in the groove and arranged to produce magnetic flux that penetrates a surface (106) of the stack of ferromagnetic steel sheets. The surface has a shape suitable for forming a desired magnetic flux density distribution into an air-gap of the permanent magnet electrical machine. The permanent magnet module further comprises a base-plate (102) made of solid ferromagnetic steel. The base plate is located at an opening (116) of the groove and constitutes together with the groove an aperture in which the permanent magnet is located.
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