| 摘要 |
PURPOSE:To reduce an unbalance voltage and to attain a high sensitivity by providing magnetic poles, which have a permeability higher than that of a magnetic core, in both end parts of a detecting coil, and extending them up to the outside diameter part of the coil for the purpose of reducing magnetic flux components leaked to asymmetrical parts. CONSTITUTION:An iron core 1 consisting of a good magnetic material is provided in the center, and an exciting coil 2 is provided with the same axis as the iron core, and detecting coils 3a and 3b are provided in both sides of this coil 2, and spacers 4a and 4b consisting of ceramic nonmagnetic materials are provided between these coils. Magnetic poles 19 and 20 having a high permeability are provided in outside ends of coils 3a and 3b, and this coil assembly is stored in a housing 5 whose front end is shell- shaped. Though the magnetic flux PHI generated by the exciting coil 2 is spread in the axial direction of the iron core 1, it is flowed from the iron core 1 in the radial direction along the magnetic pole 19 or 20 because of the high permeability of magnetic poles 19 and 20 provided in both ends, and the magnetic flux leaked in the axial direction from magnetic poles 19 and 20 is reduced extremely. Since leaked magnetic flux components in the axial direction are reduced, S/N of a flow velocity signal is improved, and a high-precision and small-sized eddy current-type current meter is attained. |
