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The stray load losses in electrical machines represent a non-negligible contribution of the total losses and are a key point for an accurate evaluation of the energy efficiency of the considered device. In this paper, a methodology using the 3-D finite element (FE) modeling approach and a posteriori loss calculation is presented for the estimation of the stray load losses. The case of a cage induction...
In this paper an analysis and modeling methodology of piezoelectric transformers is presented. Three-dimensional simulation by Finite Element Method is utilized to obtain the Mason lumped parameter model. The PT has been prototyped and the experimental measurements are compared with the simulations. The results show that the simulation in three-dimensional environment by Finite Element Method reveals...
The main objective of this paper is to determine the capability of the machine to operate at nominal load when some stator coils bars that are cut. Finite element electromagnetic simulations were carried out on an existing hydro generator of 32.5 MVA, 13.2 kV, 60 Hz, 68 poles, 432 stator slots, operating at nominal load with bypassed stator coil. The obtained results in terms of flux density and currents...
This paper investigates the iron loss and torque characteristics of inverter-fed spoke type interior permanent magnet synchronous motor (IPMSM) optimized for sinusoidal distributed back-EMF. First of all, an optimal design procedure is introduced to effectively optimize the rotor pole surface to reduce the distortion of back-EMF in the spoke type IPMSM. Then, the finite element method (FEM) results...
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