Method and device for measuring the difference in magnetic field strength with magnetoresistive sensors
AssigneeLust Antriebstechnik GmbH
InventorsLudger Hebing, Juergen Kunze, Thomas Kammer, Andreas Buente, Jan Thorsten Weber
Life of this patent
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Abstract
A method and device for measuring electric currents in n conductors (n≧2), the measurement of the currents being carried out with (n−1) magnetoresistive sensors. Reliable excess current and/or fault current protection is obtained.
Claims20
A method for measuring electrical currents in n conductors (where n≧3 and where n is a natural number), comprising the step of:
- carrying out the measurement of current in the n conductors with n−1 magnetoresistive sensors, the sensors measuring a difference in magnetic field strengths produced by the current of one or more conductors and each of the n conductor currents directly influencing at least one of n−1 magnetic field gradients created by the n conductors.
A device for measuring electrical currents comprising:
- n conductors (where n≧2 and where n is a natural number);
- and
- (n−1) magnetoresistive sensors,
- the n current conductors being arranged in a vicinity of the (n−1) magnetoresistive sensors, the sensors being configured to sense the difference in the magnetic field strength produced by the current in the conductors;
- wherein the current conductors are arranged in such a way that two current conductors are arranged in a vicinity of a measurement region of one of said sensors, and remaining current conductors are arranged at a distance away from the measurement region.
A device for measuring electrical currents comprising:
- n conductors (where n≧2 and where n is a natural number);
- and
- (n−1) magnetoresistive sensors,
- the n current conductors being arranged in a vicinity of the (n−1) magnetoresistive sensors, the sensors being configured to sense the difference in the magnetic field strength produced by the current in the conductors
- wherein at least one of the n current conductors is arranged at least partially surrounded by a component with insulation with respect to the component and at a predetermined distance from the limbs of the component.
A device for current space vector evaluation, comprising:
- a conductor and first and second sensors, wherein two sensor output signals are generated in a system by measuring an individual current of the conductor with the first sensor and by determining the difference in two other conductors with the second sensor, said sensor output signals representing an orthogonal current space vector of the symmetrical polyphase current system, and wherein measuring devices of the two sensors are allocated orthogonally with respect to one another, in such a way that any influence which the magnetic field gradients exert on one another is minimized.
A device for measuring electrical currents comprising:
- n conductors (where n≧2 and where n is a natural number);
- and
- (n−1) magnetoresistive sensors,
- the n current conductors being arranged in a vicinity of the (n−1) magnetoresistive sensors, the sensors being configured to sense the difference in the magnetic field strength produced by the current in the conductors;
- wherein n≧3.
Dependencies are inferred from the claim text.