アプリケーションギャラリ

An AC contactor is a particular type of magnetic switch device, which is activated by a primary coil fed by an alternating current. Unlike DC switches, such devices can suffer from a tendency to reopen when the AC current crosses zero. The addition of a shading coil that supports retarded induced currents with respect to those of the feeding coil makes it possible to always have a nonzero pulling force, thus providing a more stable closure.

This example studies the closing dynamics of an AC contactor and the consequent establishing of a mechanical contact. The changing distance between the moving and stationary parts of the device has an influence on the distribution of the magnetic field. This effect is accounted for using a moving mesh in the surrounding air. The model is set up using the Magnetomechanics multiphysics interface.