This work proposes a hybrid permanent magnet material based synchronous machine design, combining the advantages of rare-earth free iron nitride magnets with rare earth magnets. The primary goal of the work is to propose a solution for automotive applications for a passenger car vehicle, capable of reaching the required performance and withstanding...
This study presents a sizing methodology in the frame of the multidisciplinary design of interior permanent magnet synchronous machines. The proposed approach targets at obtaining an initial electromagnetic design of the machine, including diameters, axial length, rotor barrier shape, stator slot geometry as well as the winding layout. The analytic...
Multi-three-phase motor drives are experiencing a significant development among the multiphase solutions since they are configured as multiple three-phase units operating in parallel. Although the literature reports several torque controllers able to deal with multi-three-phase motors, most of them obtain high performance of torque regulation as lo...
This work is on deriving precise lumped parameter thermal networks for modeling the transient thermal characteristics of electric machines under variable load conditions. The goal is to facilitate an accurate estimation of the temperatures of critical machines' components and to allow for running the derived model in real time to adapt the motor co...
In order to study the problem of the high temperature reached by the end windings, caused by the high current in the armature windings of permanent magnet synchronous motors (PMSM), a 560kW gas and liquid cooling PMSM used for a compressor is analyzed. The heat source is obtained by a two-dimensional numerical analysis of the electromagnetic field....
Published in Journal of Electrical Engineering & Technology
Although the AC current and dissipation factor in phases A, B, and C were good, the magnitude of partial discharge (PD) was measured to be 191,525 pC, 11,430 pC, and 10,809 pC for phases A, B, and C, respectively, at the phase voltage of 11.5 kV, in the insulation diagnostic test of a steam turbine generator (374 MVA, 20 kV) stator winding. Root ca...
This paper proposes a second-order thermal model useful to predict the average winding temperature of electrical machines used in electrical drives. Both analytical and practical considerations are provided. The proposed model is first described, including the physical meaning of each thermal parameter. Then, an experimental procedure to properly c...
Among the synchronous electrical machines without permanent magnets, the wound-rotor salient pole solution has been recently used by some major carmakers for traction applications. However, in salient pole rotor structures the field conductors are subjected to large centrifugal forces when the machine operates at high rotational speed, in particula...
Published in Electrical Engineering
The paper introduces the possibility to eliminate certain groups of spatial harmonics of the current layer, magnetic flux density in the air gap and flux in the yoke of the induction machine with the aim to increase the efficiency. The content of higher spatial harmonics is reduced by means of the so-called combined winding. It is shown how this wi...
