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ABSTRACT: This study presents a fault-electromagnetic-thermal model of a fault-tolerant dual-star flux-switching permanent magnet motor. The analytical results in terms of phase currents, rotor velocity and output torque are firstly calculated by a Simulink-MATLAB-based fault (short-circuit) model. Then, the fault and normal phase currents are used in the motor 2D finite element method (FEM) model to calculate the copper and iron losses. As the main heat sources in electrical machines, the obtained copper and iron losses are used in the lumped parameter (LP) and the 3D FEM thermal models to calculate the temperatures of different machine components. Finally, the variation of temperatures of the machine in the presence of faults can be predicted. The results obtained by the LP and the 3D FEM models are also validated by experimental tests. A good agreement has been observed among the analytical, numerical and experimental results. In order to realise the 3D FEM model of the doubly salient rotating machine, a method to transform the salient rotor into a non-salient one have been proposed. Some methods are also proposed to enhance the performance of the cooling system and decrease the maximum temperature of the machine.
IET Electric Power Applications 08/2011; · 1.17 Impact Factor
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ABSTRACT: This paper presents copper and iron loss models of a classical switched reluctance motor (SRM) and a mutually coupled switched reluctance motor (MCSRM). The iron losses in different parts of machines are then detailed. Based on the power losses model, a lumped parameter (LP) transient thermal model during driving cycles is performed, the analytical results are validated by the finite-element (FE) transient thermal model. Special attention has been paid to model the salient rotor and a method to transform the salient rotor into a nonsalient one has been proposed. A comparison between the maximum temperatures obtained by using different heat source (average power losses or instantaneous power losses during driving cycles) is given. The experimental tests are also realized to verify the analytical and numerical results.
IEEE Transactions on Magnetics 05/2011; · 1.36 Impact Factor
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ABSTRACT: This paper examines the fault diagnosis (including detection and localization) of a Flux Switching permanent magnet Motor (FSM). Electrical and mechanical models of fault due to a partial short-circuit on one phase is described and used on a numerical simulation in order to detect and localize the fault. Fault detection is realized by a diagnostic observer (Kalman filter) which generates residual functions depending on the kind of fault. This diagnostic observer is designed by the Luenberger method and uses vibration measures to generate these residual functions.
Industrial Electronics (ISIE), 2010 IEEE International Symposium on; 08/2010
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ABSTRACT: This paper presents a novel structure of double salient interior permanent magnet machine (DSIPM machine) based on mutually coupled switched reluctance machine (MCSRM). Due to its salient rotor structure, the DSIPM machine can have less magnetic and iron materials as well as higher dynamic response than conventional IPM machines. The comparison of electromagnetic performances in terms of self and mutual inductances, d-axis and q-axis inductances, cogging torque, reluctance torque, total torque, torque ripple coefficient and flux-weakening capability between the DSIPM machine 6/8 and the DSIPM machine 12/8 has been realized. The numerical results based on Finite Element 2D shows that due to its much lower cogging torque and higher reluctance torque, the DSIPM machine 12/8 can produce higher total average torque than the DSIPM 6/8 at all phase current range. Furthermore, at low phase currents, the torque ripple of the DSIPM machine 12/8 is lower than that of the DSIPM machine 6/8, while at high phase currents, the torque ripples of these two machines are similar. Comparing to MCSRM, the DSIPM machines can produce higher average torque with lower torque ripple. Moreover, due to their high d-axis inductances, the two DSIPM machines can have theoretically “infinite” flux-weakening capability with relatively lower short-circuit currents.
Industrial Electronics (ISIE), 2010 IEEE International Symposium on; 08/2010
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ABSTRACT: This paper presents a 3-phase, 6-slot, and 4-pole mutually coupled switched reluctance motor (MCSRM 6/4) with new current distribution. This kind of SRMs has both the merits of conventional SRMs and fully pitched SRMs, i.e.finite element method (FEM) between conventional and mutually coupled SRMs, in terms of self flux-linkage and inductance per phase, mutual flux-linkage and inductance between phases, and output torque is realized. The conventional SRM is excited in unipolar mode, while the MCSRM is excited in bipolar overlapping mode. With a high coupling between phases for MCSRM, mutual inductances are employed to produce torque. Furthermore, the flux pathways are separated and distributed between phases, this leads to a less sensitivity to magnetic saturation. At high current density and high conduction angle, the MCSRM has a higher output torque and a lower torque ripple. Thus, comparing to conventional SRMs, the MCSRM shorter end-windings and higher torque density. A comparison based on finite element method (FEM) between conventional and mutually coupled SRMs, in terms of self flux-linkage and inductance per phase, mutual flux-linkage and inductance between phases, and output torque is realized. The conventional SRM is excited in unipolar mode, while the MCSRM is excited in bipolar overlapping mode. With a high coupling between phases for MCSRM, mutual inductances are employed to produce torque. Furthermore, the flux pathways are separated and distributed between phases, this leads to a less sensitivity to magnetic saturation. At high current density and high conduction angle, the MCSRM has a higher output torque and a lower torque ripple. Thus, comparing to conventional SRMs, the MCSRM is more outstanding for starter-generator applications (hybrid vehicles, aerospace) which needs high output torque.
Industrial Electronics, 2009. IECON '09. 35th Annual Conference of IEEE; 12/2009
