The magnetic flux detector has a core element providing a magnetic flux when an energizing winding is supplied with an energizing current, controlled by a current regulator, a detection winding (14) providing an induced electromotive force in response to the magnetic flux, from which the amplitude of the latter is calculated. The magnetic flux calculation stage (40) has a potential resistance (43) at its input with a greater resistance value than the internal resistance of the detection winding.
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