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|1. (WO2017154720) ELECTROMAGNETIC ACTUATOR AND SWITCH DEVICE|
|Applicants:||MITSUBISHI ELECTRIC CORPORATION
|Title:||ELECTROMAGNETIC ACTUATOR AND SWITCH DEVICE|
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).