Measurement apparatus, measurement method, and computer-readable recording medium storing measurement program

A measurement method comprising:

• acquiring, by a computer, actually-measured closed magnetic path curve data indicating a magnetization curve of a sample with no magnetic property distribution obtained by measurement using a closed magnetic path method, actually-measured open magnetic path curve data indicating a magnetization curve of a sample with magnetic property distribution obtained by measurement using an open magnetic path method, and a surface magnetic property value of the sample with magnetic property distribution, for a permanent magnet for which magnetic property is measured;
• calculating, for each divided region obtained by sectioning and dividing the permanent magnet, by using a function including a parameter that determines distribution of magnetic property of the permanent magnet, a magnetic property value of the divided region based on an internal magnetic property value extracted from the actually-measured closed magnetic path curve data and the surface magnetic property value;
• calculating estimated open magnetic path curve data indicating a magnetization curve of the permanent magnet obtained by measurement using an open magnetic path method, based on a magnetic property value of each of the divided regions and the actually-measured closed magnetic path curve data;
• changing a value of the parameter so as to minimize a magnetization difference between the actually-measured open magnetic path curve data and the estimated open magnetic path curve data;
• and
• outputting a magnetic property value of each of the divided regions calculated by using the function Including a changed value of the parameter.

A non-transitory computer-readable recording medium storing a measurement program causing a computer to execute a processing of:

• acquiring actually-measured closed magnetic path curve data indicating a magnetization curve of a sample with no magnetic property distribution obtained by measurement using a closed magnetic path method, actually-measured open magnetic path curve data indicating a magnetization curve of a sample with magnetic property distribution obtained by measurement using an open magnetic path method, and a surface magnetic property value of the sample with magnetic property distribution, for a permanent magnet for which magnetic property is measured;
• calculating, for each divided region obtained by sectioning and dividing the permanent magnet, by using a function including a parameter that determines distribution of magnetic property of the permanent magnet, a magnetic property value of the divided region based on an internal magnetic property value extracted from the actually-measured closed magnetic path curve data and the surface magnetic property value;
• calculating estimated open magnetic path curve data indicating a magnetization curve of the permanent magnet obtained by measurement using an open magnetic path method, based on a magnetic property value of each of the divided regions and the actually-measured closed magnetic path curve data;
• changing a value of the parameter so as to minimize a magnetization difference between the actually-measured open magnetic path curve data and the estimated open magnetic path curve data;
• and
• outputting a magnetic property value of each of the divided regions calculated by using the function including a changed value of the parameter.