Detector of magnetic bias, magnetic saturation, or amount of magnetic flux

A detector for detecting a magnetic bias, a magnetic saturation, or an amount of magnetic flux in a magnetic core around which a coil is wound, wherein when the coil is applied with a voltage to form a magnetic flux, inhomogeneity in distribution of magnetic flux density occurs in a non-uniform cross section of the magnetic core, and the magnetic core has a hole that penetrates the magnetic core along the non-uniform cross section, the detector comprising:

• a detection winding including a wire, the wire inserted into the hole that penetrates the magnetic core and surrounding a periphery of a detection region, the detection region being a part of the non-uniform cross section and having a magnetic flux density different from an average magnetic flux density of the non-uniform cross section;
• a detection winding measurement section performs a measurement relating to an electromotive force induced by the detection winding;
• and
• a detection section detecting the magnetic bias, the magnetic saturation, or the amount of the magnetic flux in the magnetic core based on a measurement result of the detection winding measurement section,
• wherein the magnetic core has a non-uniform shape such that when the coil is applied with the voltage to form the magnetic flux, a larger inhomogeneity portion is formed in the magnetic core where inhomogeneity in distribution of magnetic flux density in cross section is larger than that of an other portion of the magnetic core, and
• wherein the non-uniform cross section is defined in the larger inhomogeneity portion.