Miniature electrical drive and magnetic return path element, and method for its production
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United States of America Patent
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Mar 27, 2012
Grant Date -
Jan 15, 2009
app pub date -
Jul 15, 2008
filing date -
Jul 13, 2007
priority date (Note) -
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Abstract
The present invention relates to a miniature electrical drive (1), in particular a rotating field drive with permanent magnet excitation, having a stator (2) and a soft-magnetic return path element (6) which cylindrically surrounds the stator (2) and has a multiplicity of sheet-metal laminates (22) which are in the form of annular disks and are arranged in layers to form a cylindrical laminated core (20). The sheet-metal laminates (22) in the laminated core (20) are held prestressed exclusively with a force fit and in an interlocking manner in the axial and radial directions, and without adhesive or integral joint means such as this, in a supporting sleeve (24) which coaxially surrounds said sheet-metal laminates (22).
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