Grundfos Holding A/s

Grundfos Management A/s

Grundfos A/s

Keld Folsach Rasmussen

Steen Mikkelsen

Jan Carøe Aarestrup

Jan Caroe Aarestrup

Kjeld Hellegaard

Henrik Ørskov Pedersen

Martin Vad

Oluf Kjær

An electric pump drive motor three-phase stator assembly () includes three sets of stator segments (S), configured in a ring about a stator axis (R). Each set includes n≥2 stator segments arranged in an n-fold rotational symmetry about the stator axis. Each stator segment includes a coil () having a first coil wire end and a second coil wire end. A plurality of 3n−3 connection wires (W) connect coils of a respective set of stator segments in series. A first and a second interposed stator segment are arranged in circumferential direction between the two connected coils of the respective set of stator segments. 3n−5 of the connection wires span across the first interposed stator segment at a distance (r) to the stator axis and across the second interposed stator segment at a second distance (r) to the stator axis (R). The second distance is larger than the first distance.

Three-phase stator assembly

The invention relates to a centrifugal pump assembly with an electric drive motor and with a control device having a frequency converter, for the control of the rotational speed of the drive motor, wherein the control device is designed in a manner such that in at least one control region, a field weakening is produced in the drive motor, by way of which the rotational speed of the drive motor is increased.

Centrifugal pump unit

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.

Permanent magnet rotor having slanted or curved grooves

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Ans, Denmark

Keld Folsach Rasmussen