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1. 发明授权

US11146142B2 Stepping motor 有权
公开(公告)号：US11146142B2
公开(公告)日：2021-10-12
申请号：US16489166
申请日：2018-03-02
申请人： MINEBEA MITSUMI Inc.
发明人： Suguru Okura , Nobuyuki Sueyoshi , Kazuo Muramatsu , Shoji Yoshitomi , Hiroaki Fujii
IPC分类号： H02K5/24 , H02K5/16 , H02K7/16
摘要： Noise caused by a gap between a rotor and a plate can be suppressed even when there are dimensional variations in members or assembly states. In a configuration of a stepping motor including front side and end side stator assemblies (200, 300), a rotor (400) provided with a rotor member (402) and a shaft (403) that are accommodated in the stator assemblies (200, 300), and a front plate (210) and an end plate (310) that are arranged on both sides of the stator assemblies (200, 300) in an axial direction, and are configured to couple the stator assemblies (200, 300), a projection (700) in an annular shape is provided on a surface of the front plate (210) facing the rotor member (402) to protrude toward the rotor member (402), a coil spring (800) that is interposed between the front plate (210) and the rotor member (402) is accommodated in the inner side of the projection (700), and the rotor (400) is urged toward the end plate (310) by the coil spring to be elastically pressed against the end plate (310).

2. 发明授权

US11374478B2 Stepping motor 有权
公开(公告)号：US11374478B2
公开(公告)日：2022-06-28
申请号：US16986674
申请日：2020-08-06
申请人： MINEBEA MITSUMI Inc.
发明人： Nobuyuki Sueyoshi , Mitsuo Kinoshita
IPC分类号： H02K37/14 , H02K7/09
摘要： A stepping motor has a relationship between an outer diameter of a rotor and an outer diameter of a bearing made of magnetic material that can be adjusted appropriately so as to impart magnetic attractive force to the bearing, the stepping motor including a rotor 400 made of a permanent magnet, a stator 500 including multiple pole teeth 223, 243, 323 and 343 extending in an axial direction of the rotor arranged at an outer circumferential side of the rotor 400, a bearing 250 rotatably supporting one end portion in the axial direction of the rotor 400, and a bearing 260 rotatably supporting the other end portion in the axial direction of the rotor 400. Magnetic permeability of the bearing 260 is greater than that of the bearing 250, the rotor 400 includes multiple magnetic poles on an outer circumferential surface along a circumferential direction of the rotor 400, and an outer diameter DR of the rotor 400, an outer diameter DB of a portion of the bearing 260 which is facing the rotor 400, and an inner diameter DSI of the stator 500 are set to satisfy the following relationship of formula 1 DR

3. 发明授权

US11283339B2 Stepping motor 有权
公开(公告)号：US11283339B2
公开(公告)日：2022-03-22
申请号：US16986607
申请日：2020-08-06
申请人： MINEBEA MITSUMI Inc.
发明人： Nobuyuki Sueyoshi , Mitsuo Kinoshita
IPC分类号： H02K37/14 , H02K37/24 , H02K7/08
摘要： A stepping motor has a relationship between an outer diameter of a rotor and an outer diameter of a bearing made of magnetic material that can be adjusted appropriately so as to impart magnetic attractive force to the bearing, the stepping motor including a rotor 400 made of a permanent magnet, a stator including multiple pole teeth 223, 243, 323 and 343 extending in an axial direction of the rotor 400 arranged at an outer circumferential side of the rotor 400, a bearing 250 rotatably supporting one end portion in the axial direction of the rotor 400, and a bearing 260 rotatably supporting the other end portion in the axial direction of the rotor 400. Magnetic permeability of the bearing 260 is greater than that of the bearing 250, the rotor 400 includes multiple magnetic poles on an outer circumferential surface along a circumferential direction of the rotor 400, and an outer diameter DR of the rotor 400, an outer diameter DB of a portion of the bearing 260 which is facing the rotor 400, and a pitch P of the multiple magnetic poles of the rotor 400 are set to satisfy the following relationship of formula 1 (DR−P)=

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