Electromagnetic actuator and valve having the electromagnetic actuator

An electromagnetic actuator, comprising

• a mover having a magnet;
• a tubular coil;
• a tubular coil holder holding the tubular coil;
• wherein the tubular coil holder has an inner space for receiving the mover;
• wherein the tubular coil and the magnet are configured to cooperate with each other to generate a force to move the mover relative to the tubular coil holder along an axial axis,
• wherein the mover comprises a ferromagnetic element arranged to change an inductance of the tubular coil in dependency on a position of the mover relative to the tubular coil holder,
• wherein the magnet and the ferromagnetic element are arranged on the mover at an axial offset from each other,
• wherein the electromagnetic actuator is configured to determine the inductance of the tubular coil, wherein the electromagnetic actuator is configured to control the position of the mover relative to the tubular coil holder based on the determined inductance of the tubular coil.

An electromagnetic actuator comprising

• a mover having a magnet;
• a tubular coil;
• a tubular coil holder holding the tubular coil,
• wherein the tubular coil holder has an inner space for receiving the mover;
• wherein the tubular coil and the magnet are configured to cooperate with each other to generate a force to move the mover relative to the tubular coil holder along an axial axis,
• wherein the mover comprises a ferromagnetic element arranged to change an inductance of the tubular coil in dependency on a position of the mover relative to the tubular coil holder,
• wherein the magnet and the ferromagnetic element are arranged on the mover at an axial offset from each other,
• wherein the ferromagnetic element comprises a plurality of elements, wherein the elements are arranged along the axial axis at a distance from each other, and
• wherein each of the elements has a ring shape concentrically aligned with the axial axis, wherein each of the elements has an inner diameter that is different from the other elements.