Abstract: A cavitation device is provided for use in a method for the treatment of water by cavitation. The water to be treated passes through an annular cavitation zone which exists between two mutually opposite annular structures which rotate relative to one another and which have teeth directed substantially axially towards one another. Here, the water flows along cavitation surfaces which are provided on the face sides of the teeth of a first of the two annular structures and which are inclined in the circumferential direction such that, viewed in the relative direction of rotation of the other, second annular structure, the spacings between said teeth and said second annular structure increase.

Abstract: A rotor of a dynamoelectric machine is provided, the rotor comprising a shaft, an essentially cylindrical armature, an armature coil comprising aluminum coil wires and a drum commutator, which comprises an insulating support body and conductor segments which are attached to said support body and fixed therein by means of armature sections. Said conductor segments each comprise a copper running surface area and a connection area made of aluminum or a metal which can be soldered with aluminum (aluminum-compatible metal) having a soldering tag which greatly projects over the brush running surface. Said coil wires are soldered to the end side to the soldering tag of the respectively associated conductor segments and to be precise, without directly contacting the areas of the running surface.

Abstract: A device is provided for the isolated measurement of current, comprising a magnetic core that has an opening through which a primary conductor extends, and at least one measurement region that has at least two openings which divide each measurement region into at least three adjacent flux paths. The device additionally comprises a compensator winding that is wound about parts of the core outside of the at least one measurement region, at least two flux paths of the same measurement region, around which at least one exciter winding is wound, as well as at least one measurement winding that is wound about parts of the measurement region. A method is also provided for determining current in an isolated manner using the provided device.