Ieee transactions on energy conversion, vol. 22, No. 3, September 2007
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A Double Excited Synchronous Machine for
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- Abstract —This paper presents the analytical, numerical, and experimental results obtained with a double excited synchronous
- —Analytical design, double excited synchronous machine (DESM), flux-weakening, prototype, 2-D finite element method (FEM). I. I NTRODUCTION T
656 IEEE TRANSACTIONS ON ENERGY CONVERSION, VOL. 22, NO. 3, SEPTEMBER 2007 A Double Excited Synchronous Machine for Direct Drive Application—Design and Prototype Tests Daniel Fodorean, Member, IEEE, Abdesslem Djerdir, Ioan-Adrian Viorel, Member, IEEE, and Abdellatif Miraoui Abstract —This paper presents the analytical, numerical, and experimental results obtained with a double excited synchronous machine (DESM) prototype designed and constructed for an elec- tric vehicle traction system. To obtain a wide speed range, the flux- weakening technique is implemented. Analytical design, 2-D finite element method (FEM) analysis, thermal analysis, and prototype construction of the DESM are discussed, and the performances are assessed with experimental data. Index Terms —Analytical design, double excited synchronous machine (DESM), flux-weakening, prototype, 2-D finite element method (FEM). I. I NTRODUCTION T HE INVERTER-FED induction motor has represented the state of the art in the field of electric traction propulsion over the last few years because of its large constant power speed range. Nevertheless, in comparison to induction motors, perma- nent magnet (PM) synchronous motors have lower losses and a higher torque density, but have the drawback that the main flux linkage of the PM is constant. To make the PM synchronous motor competitive in the market of traction system drives, the flux-weakening technique should be, therefore, adopted. Two types of PM synchronous motors can be used with this tech- nique to obtain quite a wide speed range: one is the motor built with buried magnets [1]–[5] and the other is the one with hybrid excitation [6]–[13]. The double excitation or hybrid excitation refers to the fact that in the excitation circuit of the synchronous machine, in addition to the PM as the main component of the flux source, there is also an auxiliary excitation winding whose MMF can control the air gap field, and consequently, the speed. Up to the base speed, the auxiliary excitation MMF can, if required, also strengthen the PM field. Double excited synchronous machines (DESMs) are, from the excitation circuit point of view, either series [6], or parallel [7]–[12] double excitation circuit machines. Another classifica- tion criterion refers to the auxiliary winding location; it can be placed on the same part of the machine as the PMs [6], [7], or Manuscript received December 22, 2005; revised July 17, 2006. This work was supported in part by the Electrical Machines Department (Technical Uni- versity of Cluj-Napoca, Romania) and in part by the Electronic, Electrotechni- cal and Systems Laboratory (Technological University of Belfort-Montb´eliard, France) by the mutual research cooperation from 2001 to 2005. Paper no. TEC- 00444-2005. D. Fodorean, A. Djerdir, and A. Miraoui are with the Electronic, Electrotech- nical, and Systems Laboratory, Technological University of Belfort-Montb´eliard (TUBM), Belfort 90010, France (e-mail: daniel.fodorean@utbm.fr; abdesslem. djerdir@utbm.fr; abdellatif.miraoui@utbm.fr). I-.A. Viorel is with the Electric Machines Department, Technical Uni- versity of Cluj-Napoca (TUCN), Cluj-Napoca 400020, Romania (e-mail: ioan.adrian.viorel@mae.utcluj.ro). Digital Object Identifier 10.1109/TEC.2007.896279 on the armature [8]–[12]. If the auxiliary field winding is placed on the stator core, the flux density can be controlled locally at the air gap level; in this case, however, the supply source is bidi- rectional and the control is difficult, since there exists the risk of instabilities [11]. The series excitation circuit variant has two important advantages: the simplicity and the global reduction of the flux density. The parallel excitation circuit, in all its topolo- gies, suffers from the drawback of construction complexity. The main advantage of the DESM appears especially in those applications where the electric drives operate under partial loads [12] most of the time. For such applications, the electric motor should not only have the highest efficiency at a given Download 0.79 Mb. Do'stlaringiz bilan baham: |
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