Miniature electrical drive and magnetic return path element, and method for its production
First Claim
1. 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), characterized in that the sheet-metal laminates (22) in the laminated core (20) are held prestressed with a force fit exclusively in the radial direction, and are held axially prestressed in an interlocking manner in the axial direction, 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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Accused Products
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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Citations
16 Claims
- 1. 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), characterized in that the sheet-metal laminates (22) in the laminated core (20) are held prestressed with a force fit exclusively in the radial direction, and are held axially prestressed in an interlocking manner in the axial direction, 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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13. Soft-magnetic return path element (6) for a miniature drive (1), comprising 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), characterized in that the sheet-metal laminates (22) are held prestressed with a force fit exclusively in the radial direction, and are held axially prestressed in an interlocking manner in the axial direction, and without adhesive or integral joint means such as this, in a supporting sleeve (24) which surrounds the laminated core (20).
- 15. Method for production of a magnetic return path element (6) for a miniature electrical drive (1), characterized in that a multiplicity of individual sheet-metal laminates (22) which are in the form of annular disks are arranged in layers to form a cylindrical laminated core (20) and, in order to hold them, are inserted into a supporting sleeve (24) such that the sheet-metal laminates (22) are held prestressed with a force fit exclusively in the radial direction, and are held axially prestressed in an interlocking manner in the axial direction, and without adhesive or integral joint means such as this.
Specification