Ab#tract--Tao ways of secondary field quantities and force calculation are dimcussed and compared. For the magnetostatic case both approaches, scalar potentid and vector potential method can be applied. The malar potential formulations have proved to be very effective and finally the normal components of the magnetic flux density can be computed. If the vector potential method i s used, it i s necessary to determine the tangential components of the magnetic field strength as the secondary field value. The paper describes the method of the calculation of 3 D static fields using finite difference solutions. For calculation of forces the Maxwell stress is used.
Normal components of B and the tangential components of H alike are needed for the force calculation. If the field is calculated numerically, only one of these components is known exactly (in numerical sense), the other one is known only approximately.
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About Emerald www.emeraldinsight.comEmerald is a global publisher linking research and practice to the benefit of society. The company manages a portfolio of more than 290 journals and over 2,350 books and book series volumes, as well as providing an extensive range of online products and additional customer resources and services.Emerald is both COUNTER 4 and TRANSFER compliant. The organization is a partner of the Committee on Publication Ethics (COPE) and also works with Portico and the LOCKSS initiative for digital archive preservation.Abstract An algorithm to study a 3D system with rotating field using complex A, A-V formulation in finite difference solution is presented. Torque calculations are performed using volume Maxwell stress tensor. An eddy current tachometer is investigated. The numerical results are compared with those obtained by measurement.
IntroductionIn order to verify software for force and torque calculation, the forces produced in the eddy current tachometer have been studied. The Maxwell stress method used for calculating the torque acting on the conducting ring in the research model of the machine depends strongly on the tangential component of magnetic field strength. From vector potential solution the normal component of flux density B is given directly, the tangential component of H can be obtained only approximately. On the other hand, the algorithm to compute the tangential component of magnetic field strength can be based on the fundamental physical equations[1] and that guarantees successful accuracy of the calculations. Comparison is made between the torque values obtained using the performed software and those obtained from experimental measurements.
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