Patent ID: 8781763
Filing Date: 2014-07-15
Classification: G01R

Abstract:
1. A method for analyzing an operating point of a permanent magnet, which performs electromagnetic field analysis based on a magnetic flux density versus magnetic field curve of the permanent magnet and element data concerning a finite number of elements into which the permanent magnet is divided in order to obtain the operating point of the permanent magnet by using an arithmetic device including an analysis unit, a memory unit, and a display unit, comprising the steps of: storing data of inputted magnetic flux density versus magnetic field curve in the memory unit; obtaining magnetic flux densities and magnetic fields in a plurality of regions of the permanent magnet by performing the electromagnetic field analysis based on the data of the magnetic flux density versus magnetic field curve stored in the memory unit by using the analysis unit; and obtaining the operating point of each of the elements based on the result of the electromagnetic field analysis by employing a variable, the variable continuously varying in a first quadrant, in a second quadrant, in a third quadrant, and over these quadrants of the magnetic flux density versus magnetic field curve and linearly varying with respect to the magnetic flux density and magnetic field; wherein, at the step of obtaining the operating point, the variable representing the operating point takes on a reference value when the operating point coincides with a point of an intercept on a magnetic flux density axis of the magnetic flux density versus magnetic field curve; wherein, at the step of obtaining the operating point, the variable representing the operating point denotes a value of the operating point coincident with the point of an intercept on the magnetic field axis of the magnetic flux density versus magnetic field curve by 1, and denotes the operating point in the third quadrant of the magnetic flux density versus magnetic field curve by a value larger than 1; and wherein, at the step of obtaining the operating point, the variable representing the operating point is expressed as Hp/bHc or 1-(Bp/Br), where Bp and Hp denote a magnetic flux density and a magnetic field at the operating point, respectively, and Br and bHc denote an intercept on the magnetic flux density axis of the magnetic flux density versus magnetic field curve and an intercept on the magnetic field axis thereof, respectively.