公开(公告)号：US20190301898A1

公开(公告)日：2019-10-03

申请号：US16306643

申请日：2016-06-10

Applicant: HARMONIC DRIVE SYSTEMS INC.

Inventor： Shintaro UENO ,  Ryutaro YAMAGUCHI ,  Kiyoto KOBAYASHI ,  Keisuke TAKEWAKA

IPC: G01D5/245 ,  H02K11/215

Abstract: A hollow type rotation detecting device has a 2-pole magnet ring and a multi-pole gear, the 2-pole magnet being coaxially fixed to the outer circumferential surface of the shaft end part of a hollow motor shaft that extends coaxially inside a cylindrical cover. In an annular gap between the cylindrical cover and the 2-pole magnet ring and multi-pole gear, rigid boards are arranged with an orientation facing in a tangential direction at prescribed intervals along the circumferential direction. The rigid boards are electrically connected to one another by flexible printed wiring boards. It is possible to obtain a rotation detecting device suitable to be incorporated into the narrow annular gap between a motor house and the shaft end part of the hollow motor shaft in a hollow motor having a large hollow diameter.