US 12,002,619 B2
Permanent magnet based magnetiser
Allan Ivo Søgaard Sørensen, Hobro (DK); Henrik Rasmussen, Rødkaersbro (DK); Alexandru Sorea, Aalborg Øst (DK); and Bendixen Buus Fleming, Hobro (DK)
Assigned to Grundfos Holding A/S, Bjerringbro (DK)
Appl. No. 17/763,874
Filed by GRUNDFOS HOLDING A/S, Bjerringbro (DK)
PCT Filed Sep. 25, 2020, PCT No. PCT/EP2020/076973
§ 371(c)(1), (2) Date Mar. 25, 2022,
PCT Pub. No. WO2021/058779, PCT Pub. Date Apr. 1, 2021.
Claims priority of application No. 19199709 (EP), filed on Sep. 25, 2019.
Prior Publication US 2022/0336135 A1, Oct. 20, 2022
Int. Cl. H01F 7/02 (2006.01); H01F 13/00 (2006.01)
CPC H01F 7/0278 (2013.01) [H01F 13/003 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A magnetiser comprising a housing, a passage arranged inside the housing, and a permanent magnet assembly arranged outside the passage to provide a magnetic field passing through the passage, said housing comprising an inlet to the passage and an outlet from the passage such that an object to be magnetised can be inserted into the passage via the inlet in the housing and removed via the outlet in the housing, wherein the passage includes:
a. a uniform portion where opposing surfaces of the permanent magnet assembly are arranged a uniform distance apart along the length of the uniform portion; and
b. a diverging portion arranged between one end of the uniform portion of the passage and the outlet of the housing where opposing surfaces of the permanent magnet assembly diverge such that the distance between opposing surfaces of the diverging portion nearest the uniform portion is less than the distance between opposing surfaces of the diverging portion nearest the outlet;
c. wherein the average angle (B) of the normal vector of the opposing surfaces of the diverging portion to a longitudinal centre axis of the passage is greater than 45 degrees.