| 摘要 |
<p>PROBLEM TO BE SOLVED: To minimize a measurement error caused by the change in internal resistance due to temperature change when detecting magnetic flux using a search coil. SOLUTION: The magnetic flux detection apparatus has 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 magnetic flux calculator 40 has a potential-setting resistor 43, and the resistance B is set to a value (A = approximately B/3-B/30 that is fully larger than an internal resistance value A in the search coil 14.</p> |
