The invention relates to a filter unit for purification of impure water, which could be seawater intended for ballast water, pool water, waste water or the like. The assembly includes a cylindrical sleeve, lifting beam, spacer and two removable flanges to which a hydraulic or screw lifting system is attached. A depth in a diameter direction of each sub-slot from the rotor coil end to a nearest coil ventilation duct is larger than a depth of the sub-slot at a portion near a center of the rotor core. The engagement portion is configured to be engaged with a locking section of a cartridge installation portion for retaining the body in an installed state. A storage capacitor is formed in a layer below the power source line by the silicon layer, the condenser electrode, and the power source line. By the method, a UE can perform a security mode command and an authentication with a network.