Abstract
In this paper, we study the application of Maxwell 3D and ADAMS software for simulation and analysis of electromagnetic system, with UG software for AC contactor and main contact system of electromagnetic system. We then study the influence of harmonic on type CJX2-40 AC contactor main contact system and operation characteristics. To establish a three-dimensional finite element model of electromagnetic mechanism of AC contactor, we take Maxwell 3D software, on the model of finite element mesh, the calculation of different closing sine excitation and containing under harmonic excitation angle electromagnetic system. For the static and dynamic characteristics of AC contactor, static magnetic field distribution and the suction characteristic curve drawing, we do a comparative study of the results of the simulation, analysis of the influence of harmonics on the AC contactor motion characteristics.
Highlights
AC contactor is widely used in circuit switching and control circuit of electrical appliances
AC contactor is composed of four parts: (1) the electromagnetic system, including attracting coil, a movable iron core and the static iron core; (2) the contact system, comprises three pairs of main contact and two normally open, two normally closed auxiliary contact and the moving iron core, it is together mutual linkage; (3) out arc device, AC contactor generally larger capacity are arc extinguishing device, in order to quickly cut off the arc, avoid burning the main contact; (4) insulation casing and accessories, all kinds of spring, a transmission mechanism, a short circuit ring, terminal etc
The working principle of AC contactor: when the coil is energized, the static iron core to generate electromagnetic force, the moving core pull, because the contact system is with the moving iron core are linked, so moving core drive three movable touch bridge running at the same time, the
Summary
The working process of CJX2-40 type AC electromagnetic contactor: contactor movable contact and fixed in the insulating bracket, bracket and connected with a moving armature insulation. When the electromagnetic coil connected to the power contactor, will produce a strong magnetic field, the armature present electromagnetic force, armature, bracket, a movable contact three together action (normally closed off, normally open contacts). To generate the magnetic field between the dynamic, static iron core, an armature is in the open position, it will be affected by the electromagnetic force and the counterforce spring (spring towers) interaction [5]. When the electromagnetic force greater than the spring reaction force, the armature is attracted to the static iron core, on the one hand, a compression spring, a certain potential energy savings, release to disconnect; hand with the moving iron core contact bracket connected drives the movable contact close to the static contact, the contact spring temporarily out of action. Disconnect the power supply when the armature coil, in the tower under the action of spring in the released position, dynamic and static iron cores to form a working air gap. When the voltage of coil is reduced to a value or zero, on the end surface of the core flux is reduced, the electromagnetic suction decreased, when the electromagnetic force is less than the spring reaction force, moving core release effect this reaction force, so as to drive the movable contact disconnect circuit
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