Abstract: An electric machine which has an arched stator and a cylindrical rotor fitted inside it and in which the flux flows in the radial direction between the stator and the rotor as in a permanent-magnet radial-flux synchronous electric machine, and in which the stator of the machine consists of stator segments (2), each of which has an independent stator core and winding, and the stator segments are arranged to be physically separate from each other so that the stator consists of stator segments arched according to the radius of the rotor and working electromagnetically independently like a linear machine, each stator segment having a stator core and a winding separate from the other stator segments, and that it comprises an overhead supporting frame structure separate from the stator cores and consisting of several longitudinal ribs (41) and parts (42) between them.

Abstract: An actuator, such as a liquid ring machine, and a method in an actuator, such as transferring of fluid, is such that the machine includes a casing part within which a rotatable blade rotor is arranged. The casing part forms a hollow rotatable rotor, the inner space thereof receiving the blade rotor. A stator is provided around the casing part, whereby the casing part is rotated by an electromagnetic field between the stator and the casing part arranged to form a rotor of an electric machine.

Abstract: A solid rotor for an electric machine includes a short circuit ring of a metal material having good electrical conductivity. The short circuit ring is attached to an end face of the rotor, and includes at least two portions formed of different materials. A first portion of the short circuit ring is of a material which has essentially similar characteristics to the characteristics of the material of the rotor.