Electromagnetic torque calculation in 3D systems with rotating field

Abstract

If you would like to write for this, or any other Emerald publication, then please use our Emerald for Authors service information about how to choose which publication to write for and submission guidelines are available for all. Please visit www.emeraldinsight.com/authors for more information. 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.

Determination of electromagnetic torque with on‐line computation of the optimal radius of the integration contour

“…Assuming that the optimal surface (integration contour) is subdivided into n subsurfaces with the radius r , angle Δ φ , and length Δ z , and the grid spacing is uniform in every angle Δ φ and every Δ z , then: Equation 8 as shown in Figure 2. Applying the Maxwell stress method, the force can be computed as the combination of stresses (Henneberger et al , 1992; Demski and Szymański, 1998): Equation 9 defined in φ direction and tangential to the surface S placed around a moving body.…”

“…Many researchers have proposed interested numerical procedures to investigate the local or global torque. They have calculated the quantity using Maxwell stress tensor method (Demski and Szymański, 1998; Delaere et al , 2001), virtual work principle, based on continuum sensitivity analysis (Kim et al , 2005) or using the convolution approach (Van der Giet et al , 2009), etc. The problem is still actual and interesting (Hameyer et al , 1998; Henrotte et al , 2004; Henrotte, 2004; Van der Giet et al , 2009).…”