Method and apparatus for determining defects in the manufacture of magnetic systems

Method for determining defects in a magnetic system, which method comprises lassiguientes stages: - measurement using at least one sensor (1) of magnetic field located outside a magnetic system, the magnetic system magnetic aField; - formulating at least one equation associating the measured magnetic field with a magnetic field hipoteticodel magnetic system having at least one hypothetical defect introduced therein; and - solving said at least one formulada.caracterizado equation that the method further comprises, before the step of measuring magnetic field lassiguientes stages: - introducing the at least one hypothetical defect into the magnetic system and defining, at least one parametroque defines at least one hypothetical defect; - simulating the hypothetical magnetic system having at least a defect hipoteticointroducido in the same magnetic field; - determining points for locating the at least one magnetic field sensor (1); and - determining a series of magnetic field measurements; wherein the hypothetical magnetic field depending on one or more parameters defining the at least undefecto hypothetical, and wherein the parameter values ​​are determined by solving the at least one formuladapara equation to obtain the values ​​determining defects in the magnetic system.