US 12,261,005 B2
Electromagnetic relay and electromagnetic device
Yoshimasa Kato, Mie (JP); Yoshihide Asada, Tochigi (JP); and Machiko Nishiyama, Mie (JP)
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD., Osaka (JP)
Filed by Panasonic Intellectual Property Management Co., Ltd., Osaka (JP)
Filed on Feb. 15, 2023, as Appl. No. 18/110,164.
Application 18/110,164 is a continuation of application No. 16/760,859, granted, now 11,615,931, previously published as PCT/JP2018/039682, filed on Oct. 25, 2018.
Claims priority of application No. 2017-212215 (JP), filed on Nov. 1, 2017; application No. 2017-212216 (JP), filed on Nov. 1, 2017; and application No. 2018-093255 (JP), filed on May 14, 2018.
Prior Publication US 2023/0197387 A1, Jun. 22, 2023
Int. Cl. H01H 50/24 (2006.01); H01H 50/36 (2006.01); H01H 50/44 (2006.01); H01H 50/56 (2006.01); H01H 50/64 (2006.01)
CPC H01H 50/24 (2013.01) [H01H 50/36 (2013.01); H01H 50/44 (2013.01); H01H 50/56 (2013.01); H01H 50/643 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An electromagnetic device comprising:
an electromagnet including a coil and a yoke; and
an armature unit including:
an armature;
a permanent magnet including poles one of which faces the armature;
an auxiliary yoke including a first surface which faces the other of the poles of the permanent magnet, and a second surface facing the yoke; and
a holder holding the armature, the permanent magnet and the auxiliary yoke such that the permanent magnet is disposed between the armature and the auxiliary yoke, wherein:
the armature is configured to move toward or away from the yoke when the electromagnet is excited,
the second surface of the auxiliary yoke is adjacent to the first surface of the auxiliary yoke and a normal direction of the second surface crosses a normal direction of the first surface, the yoke includes:
a first part around which the coil is disposed, the first part being disposed not to overlap with the armature when viewed from the normal direction of the first surface;
a second part extending from the first part toward the armature to overlap with the armature and extending along an arrangement direction where the armature and the first part are arranged, when viewed from the normal direction of the first surface; and
a third part disposed such that the first part is interposed between the second part and the third part when viewed from the first part, the third part extending from the first part toward the armature to overlap with the armature and extending along the arrangement direction, when viewed from the normal direction of the first surface, and the second surface of the auxiliary yoke faces either the second part or the third part of the yoke in a range of at least part of a movable range of the armature moving in response to the excitation.