Grundfos Management A/s

Grundfos A/s

Henrik Ørskov Pedersen

Kjeld Hellegaard

Keld Folsach Rasmussen

Finn Jensen

A rotor () for an electric motor, which rotor () includes a plurality of laminated rotor sheets () arranged in layers and each provided with slots (); a number of permanent magnets () arranged within magnet slots () in the laminated rotor sheets (), where an end area () of each magnet slot () is a magnet free area. The rotor () also includes a plurality of rotor bars () arranged in rotor bar slots () and a rotor sheet band () provided between the end area () and the adjacent rotor bar slot (). At least one notch () extending from the edge () of the rotor bar slot () and/or from the edge (') of the end area () divides the rotor sheet band () into a first area () and a second area (). The smallest width (D) of the first area () is smaller than the smallest width (D) of the second area ().

Rotor

The invention relates to a permanent magnet rotor for an electric motor, in which the permanent magnets inside the rotor extend parallel to the rotation axis of the rotor, and in the area of the radially outer longitudinal edges of the permanent magnets, grooves that are open to the outside are formed on the outer periphery of the rotor. These groves are each, in a peripheral direction, slanted or curved with regard to the longitudinal edge of the adjacent permanent magnets. The center line of each groove intersects the longitudinal edge of the adjacent permanent magnet at least once. The grooves on the outside of the rotor have, in the peripheral direction, a smaller width than in an area of the groove situated radially further inside, and the cross-sectional shape of the groove is constant over the length of the rotor. The invention also relates to a method for producing a rotor of the aforementioned type.

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Silkeborg, Denmark

Henrik Ørskov Pedersen