Modeling of Solid Conductors in Two-Dimensional Transient Finite-Element Analysis and Its Application to Electric Machines

Abstract

We present an approach for directly coupling transient magnetic fields and electric circuits. The circuit can contain arbitrarily connected solid conductors located in the magnetic field region. A systematic procedure suitable for both nodal method and loop method is used to couple fields and circuits. The structures of the system equations of the two methods are analogous. The formulations allow the equations in stranded windings and solid conductors to be unified and the coefficient matrix of the system equations to be symmetrical. In order to reduce the solution domain, the periodic boundary conditions are still applicable when the solid conductors are involved. Our approach has been applied to the simulation of electric machines. We give four examples: 1) calculation of the input phase current and output torque when a single-phase induction motor with shaded rings is in locked-rotor operation; 2) simulation of the sudden short circuit of a synchronous generator with starting cage; 3) study of the phase current waveform of an induction motor when the rotor bars are broken; and 4) investigation of the parasitic capacitive impact of the surge voltage on a winding due to drive switching and cable ring.

Multi-Objective Optimal Design of a NEMA Design D Three-phase Induction Machine Utilizing Gaussian-MOPSO Algorithm

“…The iron loss resistance is determined from total iron loss of the induction machine [10]. The total iron loss P c can be determined by integrating the losses over all the elements in the core.…”

Fault Prediction of Deep Bar Cage Rotor Induction Motor Based on Fem

“…The end parameters, especially end winding resistance, have a considerable effect on the dynamic performance of the motor at load conditions [17]. Thus, these parameters have been included in the external electric circuits, which are coupled directly with finite element domain [18].…”

Coupled finite-element/boundary-element analysis of a reciprocating self-excited induction Generator in a harmonic domain

“…takes the exterior domain into account, and is obtained as differential expressions of using matrices and . Circuit equations are incorporated using matrices and with a nodal method [8].…”

“…The BE method is applied to the air gap that connects the primary and secondary domains [7], [8], [10]. This linear region with constant magnetic permeability is geometrically approximated by three-node boundary elements extracted from the primary and secondary element meshes.…”