Composite Rotor Retention Sleeves
High efficient sleeve applications of electric machines
Electric machines with stator or rotor sleeves have a wide range of application. Rotating sleeves for example are used for high speed rotors to protect magnets against centrifugal forces. Stator sleeves can be used to shield machine components from the process fluid, also called canned motor pumps. Composites are the first choice for such applications as they are almost transparent for magnetic field, have an excellent stiffness, strength and are easy to machine. AEC Kaiserslautern developed enhanced filament winding process has considerable advantages over conventional techniques leading to superior outcomes in strength and consistency. Filament winding technology provides an extreme pre-tensioning of the rotor magnets in radial direction which leads to extraordinary thin sleeve material. Low clearance between rotor and stator combined with the transparency of composite materials for the magnetic field in combination with the high mechanical properties and noncorrosive properties leads to high efficient electric machines using filament winding technology.
High speed rotor with CFRP composite sleeve
Composite retention sleeves offer the perfect technical solution as magnet retention sleeves due to their transparency for the magnetic field in combination with the high mechanical properties and low weight.
Composite retention sleeves
Composites are the first choice for such applications as they have an excellent stiffness, strength, low weight and are easy to machine. Composite sleeves can be assembled as tight fit solutions or can be applied by direct winding onto the rotors. One main advantage of direct filament winding onto rotor magnets is achieved by the elimination of machining the magnet outer surface of the rotor. Minor surface roughness of magnets and minor misalignment of magnets can be compensated by direct filament winding onto rotor magnets.
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