| 摘要 |
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.
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