US 12,339,118 B2
Rotation angle detection device and electric control device
Keiji Suzuki, Tokyo (JP); and Tatsuya Kato, Tokyo (JP)
Assigned to TDK Corporation, Tokyo (JP)
Filed by TDK Corporation, Tokyo (JP)
Filed on Mar. 23, 2023, as Appl. No. 18/188,933.
Claims priority of application No. 2022-076945 (JP), filed on May 9, 2022.
Prior Publication US 2023/0358526 A1, Nov. 9, 2023
Int. Cl. G01B 7/30 (2006.01); B60L 3/12 (2006.01); B60T 17/22 (2006.01); H02K 11/215 (2016.01); B60T 13/74 (2006.01); F16D 66/00 (2006.01)
CPC G01B 7/30 (2013.01) [B60L 3/12 (2013.01); B60T 17/22 (2013.01); H02K 11/215 (2016.01); B60T 13/745 (2013.01); F16D 2066/003 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A rotation angle detection device comprising:
a magnetic field generation unit rotatable integrally with a rotating body that rotates about a predetermined rotation axis;
a magnetic field detection unit that detects a magnetic field generated by the magnetic field generation unit; and
a magnetic field transmission unit that covers a portion of the magnetic field generation unit and is arranged in a single layer in a direction perpendicular to the rotation axis,
wherein
there is a predetermined gap between the magnetic field generation unit and the magnetic field transmission unit,
the magnetic field generation unit has a first surface, the outer periphery of which has a substantially circular shape, a second surface positioned opposite to the first surface, and a side surface connecting the outer periphery of the first surface and the outer periphery of the second surface,
the magnetic field transmission unit includes at least a first magnetic field transmission unit that covers a portion of the side surface at a first side of the magnetic field detection unit,
the first magnetic field transmission unit has a first portion which is a portion bent in a direction away from the side surface of the magnetic field generation unit and a second portion which is a portion facing the side surface of the magnetic field generation unit,
the first portion of the first magnetic field transmission unit includes a first end which is one end of the first magnetic transmission unit,
the second portion of the first magnetic field transmission unit includes a second end which is another end of the first magnetic field transmission unit,
the magnetic field detection unit is provided near the first end of the first magnetic field transmission unit,
the magnetic field generated by the magnetic field generation unit includes a first magnetic field component along a first direction and a second magnetic field component along a second direction orthogonal to the first direction,
the magnetic field detection unit detects the first magnetic field component and the second magnetic field component,
when viewed along the rotation axis, a first angle formed by a first line segment connecting the rotation axis and the second end of the first magnetic field transmission unit and a third line segment connecting the rotation axis and the magnetic field detection unit is not greater than 90°, and
when viewed along the rotation axis, an angular range of the first angle includes the second portion of the first magnetic field transmission unit.