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In this paper, a new approach to a nonlinear dq model is proposed for transient simulations of a salient-pole wound-rotor synchronous machine with dampers. Despite the nonlinearity between the flux linkage and the current, the comparison with finite element simulations shows that the new model is reliable for saturated transient state of the machine. This method allows to obtain far more accurate...
This paper presents a diagnosis method of stator inter-turn short-circuits in self-excited power alternators. First, a new way to accurately model power alternators is depicted. Thanks to a co-simulation process between Flux2D and Matlab, this model of a healthy alternator is able to faithfully reproduce the waveforms of the signals in the system and therefore their harmonic contents. This information...
This paper presents an electromagnetic analytical model for a Permanent Magnet Assisted Synchronous Reluctance Motor (PMA-SRM). The proposed model is based on the Maxwell equations: Ampere's theorem and the flux conservation law. The stator and rotor magnetic saturation are considered, as well as the effect of the magnetic bridges of the flux barriers. The goal is to compute the motor performances...
High-speed electric drive design is concerned with paying particular attention to thermal and mechanical design of the machine. Therefore, this paper proposes a multiphysic modeling of an interior permanent-magnet synchronous machine (IPMSM) dedicated to high speed, including magnetic, electric, thermal, and mechanical aspects. The proposed analytical models are verified using finite-element (FE)...
The present work proposes a development of a limited motion actuator dedicated to the air flow regulation of an internal combustion engine. A mixed analytical-FEM optimal design methodology is presented. An analytical study of a bipolar permanent magnet actuator has been done with a first geometrical optimization under constraint by a Genetic Algorithm. Then, the analytical study is coupled with Matlab®...
For high-speed machines applications, eddy-current losses in the interior permanent magnet of synchronous machine (IPMSM) form a portion of the total losses which can be significant. Indeed, the magnets are exposed to the harmonic fields which rotate with respect to the rotor. The induced losses in the magnets provoke temperature arising that must be limited to avoid the risk of demagnetization. The...
The design of an electric machine should be done paying attention to core losses. This paper provides an analytical computation of the stator magnetic flux density distribution in an interior permanent magnet synchronous machine and of the related iron losses. The magnetic flux density waveform in the stator teeth and its 2D distribution in the stator yoke are obtained under load condition using an...
This paper develops a method for analyzing the constant speed steady state of a three phase excited synchronous machine fed with any periodic voltages. The dq Harmonic Balance method is extended to account for back emf-linkage flux- and its time harmonics in current and torque waveform determinations. The method is applied to the case of surface mounted permanent magnet machines and to the case of...
An analytical model for interior permanent-magnet synchronous machine is detailed using the equivalent d-q machine based on the determination of flux density waveforms in the different axes of the d-q frame. The main parameters of the Park model machine are analytically expressed. The expressions of electromotive force, d-, and q-axis synchronous inductances are derived considering the presence of...
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