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1. (WO2017154720) ELECTROMAGNETIC ACTUATOR AND SWITCH DEVICE

Pub. No.:    WO/2017/154720    International Application No.:    PCT/JP2017/008236
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Fri Mar 03 00:59:59 CET 2017
IPC: H01F 7/16
H01H 33/38
H01H 33/666
Applicants: MITSUBISHI ELECTRIC CORPORATION
三菱電機株式会社
Inventors: SAGARA Yuta
相良 雄大
MORI Mitsugi
森 貢
TAKAHASHI Kazuki
高橋 和希
KOMOTO Shigeki
幸本 茂樹
DEGUCHI Tomoya
出口 智也
FUJIWARA Takumi
藤原 匠
NAKANISHI Yosuke
仲西 洋介
Title: ELECTROMAGNETIC ACTUATOR AND SWITCH DEVICE
Abstract:
The objective of the invention is to obtain an electromagnetic actuator capable of, when driving an armature, applying a stable initial loading force onto the armature without leaking magnetic flux to the exterior. This electromagnetic actuator (1) comprises: a root base portion (armature root base portion (11)); an armature (3) having an extension portion (armature extension portion (12)) whereof the external diameter is smaller than the root base portion (11) and provided so as to extend from the root base portion (11) in the direction of a coil axis (4a) of a coil (4); and a core (2), which is a magnetic body forming together with the armature (3) a magnetic path wherethrough a magnetic flux generated by the coil (4) passes. The core (2) has: on the inner side thereof, an attraction portion (15) generating an attractive force between the core and a peripherally extending portion (11b) due to the passage of magnetic flux therethrough; and, facing the armature (3), an armature-facing portion (inner peripheral surface (9a)) forming a second magnetic path (M2) wherethrough magnetic flux passes, on the outer side of a first magnetic path (M1) wherein magnetic flux passes through the suction portion (15).