US 11,913,813 B2
Power generation element, magnetic sensor, encoder, and motor
Yoshitomo Nakamura, Tokyo (JP); Yoshinori Miyamoto, Tokyo (JP); Shinichiro Yoshida, Tokyo (JP); Hisanori Torii, Tokyo (JP); Takeshi Musha, Tokyo (JP); Masanori Nimura, Tokyo (JP); Shizuka Ueda, Tokyo (JP); Takuya Noguchi, Tokyo (JP); Toshio Mekata, Tokyo (JP); Yuji Kubo, Tokyo (JP); and Hitoshi Hasegawa, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 18/270,239
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Dec. 27, 2021, PCT No. PCT/JP2021/048657
§ 371(c)(1), (2) Date Jun. 29, 2023,
PCT Pub. No. WO2022/153861, PCT Pub. Date Jul. 21, 2022.
Claims priority of application No. PCT/JP2021/000651 (WO), filed on Jan. 12, 2021.
Prior Publication US 2023/0392962 A1, Dec. 7, 2023
Int. Cl. G01D 5/245 (2006.01); G01R 33/02 (2006.01); H10N 50/10 (2023.01)
CPC G01D 5/245 (2013.01) [G01R 33/02 (2013.01); H10N 50/10 (2023.02)] 19 Claims
OG exemplary drawing
 
1. A power generation element comprising:
a magnetic member made of a magnetic material to produce a large Barkhausen effect;
a power generation coil to interlink with a magnetic flux passing through the magnetic member; and
two magnetism collectors containing a soft magnetic material and each including an insertion part having the magnetic member inserted therethrough, the magnetism collectors being provided at opposite end portions of the magnetic member in contact with the magnetic member with the magnetic member inserted through the insertion parts, wherein
the magnetism collector includes a first component on an opposite side of a boundary plane to a magnetic field and a second component on the same side of the boundary plane as the magnetic field generator, the boundary plane being defined as an imaginary plane passing through a center of an imaginary inscribed circle, the imaginary inscribed circle being inscribed in the insertion part and having a diameter equal to a length of the insertion part in a third direction, the third direction being a direction perpendicular to both a first direction and a second direction, the imaginary plane being parallel to an imaginary plane having a normal vector defined by the second direction, the first direction being a direction in which the magnetic member is inserted in the insertion part, the second direction being a direction in which the magnetic field generator to apply a magnetic field to the magnetic member is disposed as viewed from the magnetism collector, and
a volume of the second component is larger than a volume of the first component.