The invention relates to a DC magnetic system and a power equipment, comprises a yoke and an armature. The yoke comprise a bent U-shaped magnetic conductive member and a cover plate with a hole connected to a top end of the magnetic conductive member. The armature with a laminated structure is inserted into the yoke through the hole in the cover plate, and a bottom surface of the armature is in contact with the magnetic conductive member.

An electromagnetic device includes a coil, a fixed iron core, a movable iron core configured to reciprocate to separate from the fixed iron core by a predetermined gap when a current applied to the coil is stopped and move to the fixed iron core by an attractive force when the current is applied to the coil, and a permanent magnet. The permanent magnet is arranged so that the permanent magnet is opposed to the gap in a second direction perpendicular to a first direction and separated from the fixed iron core and the movable iron core with a space interposed therebetween. A direction of a second magnetic flux generated by the permanent magnet conforms to a direction of the first magnetic flux between opposed surfaces of the fixed iron core and the movable iron core.

An electromagnetic device includes a fixed iron core through which a first magnetic flux flows, a movable iron core that reciprocates to separate from the fixed iron core by a predetermined gap when a current applied to a coil, which generates the first magnetic flux, is stopped and move to the fixed iron core by an attractive force when the current is applied to the coil. The electromagnetic device also includes a permanent magnet that generates a second magnetic flux. The opposed surface of the fixed iron core and the opposed surface of the movable iron core may be opposed in a reciprocating direction of the movable iron core. The permanent magnet may be attached to the fixed iron core such that a magnetized surface of the permanent magnet is opposed and exposed to the opposed surface of the movable iron core.

An electromagnetic relay includes a fixed terminal, a movable contact piece, a first contact, and a second contact. The fixed terminal includes a first surface. The movable contact piece includes a second surface disposed to face the first surface. The first contact is embedded in one of the fixed terminal or the movable contact piece to be flush with one of the first surface or the second surface. The second contact is disposed on the other of the fixed terminal or the movable contact piece to face the first contact. The second contact protrudes from the other of the first surface or the second surface toward the first contact and include a contact surface smaller than the first contact when viewed from a direction facing the first contact.

An electromagnetic device includes: a coil configured to generate a first magnetic flux; a fixed member, a movable member configured to reciprocate to separate from the fixed member by a predetermined gap when a current applied to the coil is stopped and move to the fixed member by an attractive force when the current is applied to the coil; and a permanent magnet configured to generate a second magnetic flux between the respective opposed surfaces of the fixed member and the movable member in the same direction as the first magnetic flux. The permanent magnet is attached to at least one of the fixed member and the movable member such that a magnetized surface of the permanent magnet is opposed and exposed to the opposed surface of the other one of the fixed member and the movable member.

An electromagnetic device includes a coil, a fixed member, a movable member configured to reciprocate to separate from the fixed member by a predetermined gap when a current applied to the coil is stopped and move to the fixed member by an attractive force when the current is applied to the coil, and a permanent magnet. The permanent magnet is arranged at a position adjacent to the gap and separated from the fixed member and the movable member with a space interposed therebetween. A direction of a second magnetic flux generated by the permanent magnet conforms to a direction of a first magnetic flux generated between the respective opposed surfaces of the fixed member and the movable member when the current is applied to the coil.

Systems, methods, techniques and apparatuses of contactors are disclosed. One exemplary embodiment is a contactor including an electric pole, a pair of plungers, and a pair of opening springs. The electric pole includes a fixed yoke member and a movable yoke member arranged respectively at a proximal position and a distal position with respect to a movable contact. The fixed yoke member includes a pair of through holes. The pair of second plungers are inserted in a corresponding through hole passing through the fixed yoke member and symmetrically positioned with respect to a main symmetry plane of the contactor, which is parallel to a displacement axis of the movable contact and perpendicular to a displacement plane of the movable contact. The pair of opening springs are symmetrically positioned with respect to the main symmetry plane.

Disclosed is a switching device having an electromagnetic actuation device for driving a movable contact, which actuation device has an excitation coil for generating a magnetic field, a magnetic yoke for amplifying the flux density of the magnetic field, and a magnet armature which can be pulled from a starting position to a pulled position by the magnetic field and which is connected to the movable contact. The actuation device includes a locking element which at least partly consists of a ferromagnetic material and is arranged such that by virtue of the effect of the magnetic field, the locking element is brought from the unlocking position to the locking position. The magnetic yoke is designed to have a discontinuity when the locking element is in the locking position, and the discontinuity of the magnetic yoke is closed by the locking element when the locking element is in the unlocking position.

A contactor includes a plurality of switches mechanically coupled to an actuator. The actuator is moveable between operational and tripped positions. Switches that are closed in the operational position are open in the tripped position, and vice versa. The actuator extends through a coil as a core. The coil moves the actuator when an input signal is applied to the coil. A first input circuit receives a power-up input signal to transition the contactor from a tripped position to an operational position. A second input circuit receives a trip signal to transition the contactor from the operational position to the tripped position. First and second switches, coupled to respective first and second ends of the coil, reverse the polarity of the coil each occurrence of the actuator being actuated in preparation for the coil to be energized and magnetically polarized in an opposite direction during a next subsequent actuation.

A polarized DC electromagnetic device and electromagnetic contactor using same to improve assembly efficiency without size increase of the electromagnetic device. The device includes a plunger inserted through a cylindrical portion of a spool around which an excitation coil is wound and having a first armature and a second armature attached to both ends, an outer yoke attracting the first armature and the second armature, an inner yoke disposed inside the outer yoke and attracting the second armature, and a permanent magnet disposed between the outer yoke and the inner yoke. The spool includes radially protruding flange portions respectively formed at both ends of the cylindrical portion, a coil terminal attachment portion formed in the flange portion on the first armature side, and a coil terminal attached to the coil terminal attachment portion.