Abstract: A sensor assembly for measuring current I.sub.o is disclosed. The sensor assembly includes four magnetoresistive resistors (1, 2, 3, 4) arranged to form a Wheatstone bridge. The bridge is disposed over a U shaped conductor 14. The resistors are arranged so that two resistors (1,2) forming one bridge branch are disposed over one leg of the conductor and the two resistors (3,4) forming the other bridge branch are disposed over the other leg of the conductor. Each resistor is formed out of a number of magnetoresistive strips (1', 2', 3', 4'). The magnetoresistive strips forming the individual bridge branch resistors are interleaved so as to ensure the resistors forming each bridge branch have substantially the same temperature. When current I.sub.o is applied to the conductor, the equal and opposite magnetic fields that develop around the individual bridge branches cause the Wheatstone bridge to produce a signal U.sub.a that is a function of the current.

Abstract: A method and apparatus for the control of an AC-machine is set forth with a special winding for the combined generation of a torque and of a transverse force in the machine. In this arrangement, the magnitude and direction of a transverse force acting on the rotor of an AC-machine is controlled via the current of a control winding of the machine. For this purpose, the magnitude and direction of a flux of the machine generated by a drive winding and also the torque-forming component of the drive current is detected. From these parameters, the desired value of the control current vector can be precisely calculated via a decoupling equation in a coordinate system which is rotating with the machine flux. Through vector rotation, through the flux angle and a constant angle, which takes into account of the position of the winding axes of the drive and control windings, the desired value of the control current vector can be transformed into the stator coordinate system of the control winding.

Abstract: For potential-free d.c. and a.c. measurement, a terminal for connecting live conductors with at least two clamping components for the electrical conductors and a connecting member securing the clamping components together has one or more magnet field sensors arranged at a predetermined distance from the connecting member securing the clamping components of the electrical conductors together.