| 摘要 |
<p>PROBLEM TO BE SOLVED: To detect magnetic flux accurately by detecting main magnetic flux itself that flows through a magnetic path. SOLUTION: The magnetic flux detection apparatus comprises a core member 12 and an armature member 11 for generating magnetic flux by receiving the supply of an excitation current to an excitation coil 13, and supplies and controls an excitation current to the excitation coil 13 by an excitation current controller 30. In this case, a magnetic flux calculator 40 is provided for measuring an induced electromotive voltage that is generated according to the change in magnetic flux from a search coil 14 that is provided in a magnetic path where the magnetic flux passes to calculate magnetic flux. The excitation current controller 30 performs excitation current supply control for increasing an excitation current from a zero current value to a specific current value for first specific time T1, and then decreasing an excitation current from a specific current value to a zero current value for second specific time T2. The magnetic flux calculator 40 calculates magnetic flux from the difference between an increased electromotive voltage integral value obtained by integrating an induced electromotive voltage that is generated from the search coil 14 at the first specific time T1, and a reduced electromotive voltage integral value for integrating the induced electromotive voltage that is generated from the search coil at the second specific time.</p> |
