US 11,852,623 B2
Magnetic sensor for capturing metal wear particles in suspension in a lubrication fluid
Kazuhiko Sakurai, Tokyo (JP); Takahito Azuma, Tokyo (JP); and Atsushi Koike, Tokyo (JP)
Assigned to NABTESCO CORPORATION, Tokyo (JP)
Filed by NABTESCO CORPORATION, Tokyo (JP)
Filed on Nov. 20, 2020, as Appl. No. 17/100,054.
Claims priority of application No. 2019-227654 (JP), filed on Dec. 17, 2019.
Prior Publication US 2021/0181177 A1, Jun. 17, 2021
Int. Cl. G01N 33/28 (2006.01); G01N 27/12 (2006.01)
CPC G01N 33/2858 (2013.01) [G01N 27/122 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A sensor comprising:
a first electrode made of a magnet;
a second electrode made of a magnet and arranged relative to the first electrode with a first gap being provided therebetween in a circumferential direction around an axial line of the sensor; and
a first attracting portion arranged in the first gap, the first attracting portion having an outer peripheral surface made of an insulating material,
wherein the first electrode, the first attracting portion, and the second electrode are arranged in this order in the circumferential direction,
wherein the first electrode and the second electrode are magnetized in a radial direction orthogonal to the axial line, and magnetization directions of the first electrode and the second electrode adjacent in the circumferential direction are opposite to each other in the radial direction,
wherein electric connection is established along the outer peripheral surface via conductive particles gathering to the first attracting portion, and
wherein the conductive particles are attracted to the outer peripheral surface of the first attracting portion, so that a short circuit is caused in the circumferential direction between the first electrode and the second electrode, resulting in a change in electrical resistance between the first electrode and the second electrode.