公开(公告)号：US20190103789A1

公开(公告)日：2019-04-04

申请号：US16144063

申请日：2018-09-27

Applicant: Seiko Instruments Inc.

Inventor： Kosuke YAMAMOTO ,  Shinji KINOSHITA

IPC: H02K15/02 ,  G04C3/14

Abstract: Provided herein is a method for producing a stator for motors, and a stator for motors with which heat deformation due to laser irradiation at the time of forming a non-magnetic region can be reduced. A method for producing a stator for motors includes an unmagnetizing step of forming a non-magnetic region in a magnetic sheet material, and a working step of working a part of the non-magnetic region in the magnetic sheet material so as to form a hole for a rotor of a motor.

公开(公告)号：US20200225619A1

公开(公告)日：2020-07-16

申请号：US16734873

申请日：2020-01-06

Applicant: Seiko Instruments Inc,.

Inventor： Kosuke YAMAMOTO ,  Shinji KINOSHITA ,  Ryosuke ISOGAI

IPC: G04C3/14 ,  H02K37/14 ,  H02K1/02 ,  H02K15/02

Abstract: A stator includes a magnetic body having a through-hole, a magnetoresistive portion disposed around the through-hole to generate a magnetic pole around the through-hole in a case where a coil is excited, and a non-magnetic portion disposed at a position different from a position of the magnetoresistive portion around the through-hole by means of thermal melting, and formed to have lower magnetic permeability than the magnetic body.

公开(公告)号：US20210091607A1

公开(公告)日：2021-03-25

申请号：US17022918

申请日：2020-09-16

Applicant: Seiko Instruments Inc.

Inventor： Kosuke YAMAMOTO ,  Shinji KINOSHITA ,  Hitoshi TAKEUCHI ,  Tatsuya OMURA

IPC: H02K1/14 ,  G04C3/14 ,  H02K37/16 ,  H02K15/02

Abstract: A stator includes a magnetic plate material that has a main plate surface that is a surface to face a main plate of a movement when assembled to the main plate and that has a rotor accommodating hole formed in a part thereof; and a non-magnetic region that is made non-magnetic by applying chromium on the main plate surface around the rotor accommodating hole and irradiating the chromium with a laser from the main plate surface side.

公开(公告)号：US20170108833A1

公开(公告)日：2017-04-20

申请号：US15295477

申请日：2016-10-17

Applicant: Seiko Instruments Inc.

Inventor： Kosuke YAMAMOTO ,  Shinji KINOSHITA

IPC: G04C3/14 ,  H02K15/02 ,  H02K15/12 ,  G04B19/04 ,  H02K1/02

CPC classification number: G04C3/14 ,  G04B19/04 ,  H02K1/02 ,  H02K15/02

Abstract: A stepping motor includes a rotor that is used in rotating an indicating hand, and a stator that configures a magnetic path, that is made of an alloy containing Fe, Ni, and Cr, and in which a Cr-diffusion region whose Cr-concentration is 14 mass % or greater is disposed in a portion whose cross-sectional area in the magnetic path is smaller than a cross-sectional area of other portions.