Information processing device, closed magnetic circuit computing method, and closed magnetic circuit computing system

A non-transitory computer-readable recording medium storing therein a program for causing a computer to execute a process, the process comprising:

• storing a measurement result of a first magnetization of a permanent magnet corresponding to an external magnetic field in an open magnetic circuit environment;
• and
• dividing the permanent magnet into a plurality of meshes, generating a function based on the measurement result, the function indicating a second magnetization corresponding to the external magnetic field in a closed magnetic circuit environment, the function including a parameter having a value corresponding to the external magnetic field,
• calculating the second magnetization corresponding to the external magnetic field based on the function for each of the meshes, calculating a diamagnetic field corresponding to the external magnetic field based on the second magnetization for each of the meshes,
• calculating, for each of the meshes based on the function, a third magnetization of the permanent magnet corresponding to the external magnetic field in the open magnetic circuit environment in a state where influence of the diamagnetic field is applied to the external magnetic field,
• calculating an average of the third magnetizations of the meshes corresponding to the external magnetic field,
• calculating an error between the first magnetization indicated by the measurement result and the calculated average of the third magnetizations,
• correcting the value of the parameter corresponding to the external magnetic field based on the error, and
• repeating the calculation of the second magnetization, the calculation of the diamagnetic field, the calculation of the third magnetizations, the calculation of the average, the calculation of the error, and the correction of the value of the parameter until the error falls below a threshold.

A closed magnetic circuit computing system comprising:

• a memory;
• a magnetic field sensor;
• a controller configured to measure a first magnetization of a permanent magnet corresponding to an external magnetic in an open magnetic circuit environment by using the magnetic field sensor;
• a processor coupled to the memory and the processor configured to:
• store a measurement result of the first magnetization in the memory,
• divide the permanent magnet into a plurality of meshes, generate a function based on the measurement result, the function indicating a second magnetization corresponding to the external magnetic field in a closed magnetic circuit environment, the function including a parameter having a value corresponding to the external magnetic field,
• calculate the second magnetization corresponding to the external magnetic field based on the function for each of the meshes, calculate a diamagnetic field corresponding to the external magnetic field based on the second magnetization for each of the meshes,
• calculate, for each of the meshes based on the function, a third magnetization of the permanent magnet corresponding to the external magnetic field in the open magnetic circuit environment in a state where influence of the diamagnetic field is applied to the external magnetic field,
• calculate an average of the third magnetizations of the meshes corresponding to the external magnetic field,
• calculate an error between the first magnetization indicated by the measurement result and the calculated average of the third magnetizations,
• correct the value of the parameter corresponding to the external magnetic field based on the error, and
• repeat the calculation of the second magnetization, the calculation of the diamagnetic field, the calculation of the third magnetizations, the calculation of the average, the calculation of the error, and the correction of the value of the parameter until the error falls below a threshold.