公开(公告)号：US20220155051A1

公开(公告)日：2022-05-19

申请号：US17593858

申请日：2020-03-24

Applicant: MINEBEA MITSUMI Inc.

Inventor： Norikazu SATO ,  Kaoru NISHIGUCHI ,  Hiroyuki HISHIYAMA ,  Yujin ISHI

IPC: G01B7/30 ,  G01D5/14 ,  G01D5/16

Abstract: An absolute encoder preferable in being made compact is provided.
The absolute encoder includes a worm gear, a permanent magnet (19) provided on a top end side of the worm gear, and magnetic sensors. In the permanent magnet (19), a given first polar portion (N) among first polar portions each having a first polarity and a given second polar portion (S) among second polar portions each having a second polarity different from the first polarity are formed adjacent to each other, when viewed from an end surface of the permanent magnet (19) in an axial direction thereof. A given first polar portion (N) and a given second polar portion (S) are formed to be adjacent in a radial direction, with a radial middle portion of the permanent magnet (19) that is a boundary. A given first polar portion (N) and a given second polar portion (S) are formed to be adjacent in an axial direction, with an axial middle portion of the permanent magnet (19) that is a boundary.

公开(公告)号：US20200280245A1

公开(公告)日：2020-09-03

申请号：US16647562

申请日：2018-09-18

Applicant: MINEBEA MITSUMI Inc.

Inventor： Yasuo OSADA ,  Hiroyuki HISHIYAMA

IPC: H02K11/215 ,  H02K7/116

Abstract: Provided is an angle detection apparatus making it possible to reduce the labor of manufacturing while also suppressing bulkiness.The angle detection apparatus includes a first rotating body (120), a second rotating body (122), a first transmission mechanism (111) that causes the second rotating body (122) to rotate by reducing a speed of a rotation of the first rotating body (120), a first angle detector (Ds) that detects a rotational angle of the first rotating body (120), another second angle detector (Dm) that detects a rotational angle of the second rotating body (122), and a processor (40) that specifies a number of revolutions (Rs) of the first rotating body (120). The processor (40) specifies the number of revolutions (Rs) while dynamically varying a specification condition for specifying the number of revolutions (Rs) according to a numerical value decided according to the detected rotational angle of the first rotating body (120) and a reduction ratio (G1) of the first transmission mechanism (111), and the detected rotational angle of the second rotating body (122).