| 摘要 |
PROBLEM TO BE SOLVED: To provide an electromagnet actuator decreasing magnetic resistance even in the position far from an electromagnet and holding an armature at low holding current in seating of the armature. SOLUTION: This actuator has the armature connected to the valve and supported in the neutral position in a non-operating state; and first and second electromagnets facing each other through the armature, and driving the armature between the closing position and the opening position of the valve. The outer circumferential parts of yokes of the first and second electromagnets are connected with extended yoke parts, the end of the armature is faced to the end surface of the yoke in a state that the armature is seated on the first or second electromagnet, and a gap is present between the side edge part of the armature and the extended yoke. Even when the armature is in the position far from each electromagnet by the extended yoke part in the outer circumferential part, magnetic resistance is low, and since the end of the armature is faced to the end surface of the yoke in seating of the armature, the armature is held at low holding current.
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