公开(公告)号：US10816002B2

公开(公告)日：2020-10-27

申请号：US15776130

申请日：2016-11-16

Applicant: Grundfos Holding A/S

Inventor： Flemming Buus Bendixen ,  Alan Ivo Sogaard Sorensen

IPC: F04D13/02 ,  F04D7/06 ,  F04D13/06 ,  H02K49/10

Abstract: The present invention relates to a pump unit (300), with at least one impeller, comprising a coupling, wherein the coupling is mechanically connected to the at least one impeller via an inner rotor and where an outer rotor is connected to an electrical machine arranged to produce a rotational torque, said pump being arranged to circulate a hot fluid by the impeller. The coupling includes an outer rotor including a plurality of permanent magnets (101,201) arranged to form a plurality of magnetic poles (105, 205), and an inner rotor (110, 210), whereby the outer rotor and the inner rotor are located coaxially to one another around an axis (130, 230) and spaced apart from one another by an air gap (150,250). A rotor can (330) is arranged in the air gap (250, 150) between the inner rotor and the outer rotor, so as to make a dividing section between the inner and outer rotor. Each of the plurality of magnetic poles comprises at least a section with a radial magnetic direction in respect of the axis (130, 230) and at least a section with a magnetic direction angled between a radial direction and a tangential direction in respect of the axis (130, 230), wherein the combined length of the sides of the plurality of permanent magnets cover less than 75% of the circumference of the cylindrical structure. The outer rotor has a cylindrical structure (120, 220) surrounding the plurality of magnetic poles (105, 205), and the cylindrical structure is made of a magnetic susceptible material for conducting a magnetic flux between the plurality of magnetic poles (105, 205) The inner rotor (110, 210) is made of a magnetic susceptible material and free from permanent magnetic material, wherein the inner rotor is formed with multiple radial projections (111, 211) acting as salient inner rotor poles distributed around the axis (130, 230) of the inner rotor. The invention also relates to a coupling with the above mentioned coupling features.

公开(公告)号：US10411571B2

公开(公告)日：2019-09-10

申请号：US15321453

申请日：2015-05-27

Applicant: GRUNDFOS HOLDING A/S

Inventor： Flemming Buus Bendixen ,  Peter Kjeldsteen ,  Allan Ivo Søgaard

IPC: H02K1/02 ,  H02K7/16 ,  F04D13/02 ,  H01F13/00 ,  H02K15/03 ,  H02K16/00 ,  H02K49/10 ,  H01F41/02

Abstract: A magnetic coupling includes an inner rotor (11) and an outer rotor (9) which at least partly surrounds the inner rotor (11). These rotors (11, 9) each are formed of magnetic material (18) and are coupled to one another by way of magnetic forces. The inner rotor (11) and/or the outer rotor (9) contain powdery, magnetizable material (18). The powdery, magnetizable material (18) is magnetized at a side lying opposite the other rotor at several locations distributed over the periphery.

公开(公告)号：US20170201167A1

公开(公告)日：2017-07-13

申请号：US15321611

申请日：2015-06-15

Applicant: Grundfos Holding A/S

Inventor： Flemming Buus Bendixen ,  Frank Gravers Pedersen ,  Peter Valler ,  Henrik Rasmussen ,  Allan Ivo Søegaard

IPC: H02K49/10 ,  F04D25/02 ,  F04D25/06 ,  F04D13/06 ,  F04D13/02

CPC classification number: H02K49/102 ,  F04D13/027 ,  F04D13/06 ,  F04D25/026 ,  F04D25/06 ,  F04D29/22 ,  F04D29/28 ,  H02K49/108

Abstract: The present invention relates to a magnetic gear comprising a first magnetic rotor with a first shaft; and a second magnetic rotor with a second shaft; a support structure, with a first end shield and a second end shield connected by a stat or support element. A first bearing attached to the first end shield supports the first shaft and a second bearing supports the second shaft. The first and second magnetic rotors are displaced in axial direction from each other in an axial gap; and the first shaft and shaft are approximately aligned in opposite axial directions; and a plurality of magnetic flux conductors encircles the first and second magnetic rotors, thereby conducting magnetic flux from the first magnetic rotor to the second magnetic rotor. The magnetic gear comprises a dividing wall arranged in the axial gap between the first magnetic rotor and the magnetic second rotor, to separate a first chamber from a second chamber.