Finite element analysis of a modular brushless wound rotor synchronous machine

Luong, Huong Thao Le; Hénaux, Carole; Messine, Frederuc; Mariani, Guilherme Bueno; Voyer, Nicolas; Mollov, Stefan

doi:10.1049/joe.2018.8206

Cited by 3 publications

(2 citation statements)

References 16 publications

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“…This optimization phase is presented in Section 2, where the best WRSM that we found so far is provided. The optimization problem does not strongly represent the schedule of conditions, In [11], using electromagnetic analysis, our choice about a 7-phases/7-slots/6-poles WRSM structure, with a concentrated fractional slot, winding without overlap is detailed; this WRSM was selected among a set of different machines. This choice was made based on the criteria of machine efficiency, torque density, and torque ripple.…”

Section: Introductionmentioning

confidence: 99%

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Optimization, 3D-Numerical Validations and Preliminary Experimental Tests of a Wound Rotor Synchronous Machine

et al. 2021

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In this paper, a complete methodology to design a modular brushless wound rotor synchronous machine is proposed. From a schedule of conditions and a chosen structure (with 7 phases, 7 slots and 6 poles), a non-linear and non-convex optimization problem is defined and solved using NOMAD (a derivative free local optimization code): the external volume is minimized under some constraints, which are the average torque equal to 5 Nm, the torque ripple less than 5%, the efficiency greater than 94%, and the surface temperature less than 85 °C. The constraints have to be computed using 2D-finite element simulations in order to reduce the CPU-time consumption for each NOMAD iteration. Moreover, a relaxation of this optimization problem makes it possible to provide an efficient starting point for NOMAD. Thus, a good optimal design is obtained, and it is then validated by using 3D electromagnetic and thermic numerical methods. These numerical verifications show that, inside the end-winding, the leakage flux is high. This yields a lot of iron losses in this machine. Moreover, the surface and coil temperature differences between the 2D and 3D numerical approaches are discussed. Finally, the machine prototype is built following the optimal dimensions and a POKI-POKITM assembly technology. Preliminary experimental tests are carried out, and the results are devoted to the comparison of measured and predicted 3D numerical results.

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Section: Introductionmentioning

confidence: 99%

“…The so-obtained results demonstrated that the modular brushless WRSM owns interesting features, with performances closely matching that of the PMSM. For details about this choice of this 7-phases/7-slots/6-poles WRSM structure, see [11].…”

Section: Introductionmentioning

confidence: 99%

Optimization, 3D-Numerical Validations and Preliminary Experimental Tests of a Wound Rotor Synchronous Machine

et al. 2021

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High energy efficiency oriented-control and design of WFSM based on driving condition of electric vehicle

et al. 2022

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Comparative Study of Electrically Excited Conventional and Homopolar Synchronous Motors for the Traction Drive of a Mining Dump Truck Operating in a Wide Speed Range in Field-Weakening Region

et al. 2022

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A synchronous homopolar motor (SHM) has a salient pole passive rotor, an excitation winding located on the stator, and no permanent magnets, which ensures high reliability and makes this type of motor a good alternative to motors traditionally used in traction drives. However, there is no comparison between SHMs and conventional brushed synchronous machines for traction applications in the literature. In this paper, the performances of a wound rotor synchronous machine (WRSM) and SHM are theoretically compared at the operating points of a 370 kW dump mining truck drive traction curve that has a 10:1 constant power range in the field weakening region. The nine-phase motors under comparison have the same outer diameter of the stator lamination. Before comparison, both motor designs are optimized using the Nelder–Mead method to minimize the semiconductor inverter rated current and the operating cycle power loss. The main advantages of the WRSM, which was designed, are reduction in stator length, smaller losses, and smaller inverter. The reduction in the total stator length was by 1.23 times taking into account the winding end parts as well. Losses were reduced by 1.21 times for the same radius of the stator lamination. Finally, the cost of power modules of the inverter was decreased by 1.4 times. SHM is more reliable since its rotor does not have an excitation winding and a diode rectifier, as in a WRSM with a brushless exciter. In addition, SHM provides lower consumption of copper, which reduces the total mass and cost of active materials. This article also introduces a new term, “inverter utilization factor”, which can be useful, more informative than motor power factor, when comparing traction drives with different types of motors.

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Finite element analysis of a modular brushless wound rotor synchronous machine

Cited by 3 publications

References 16 publications

Optimization, 3D-Numerical Validations and Preliminary Experimental Tests of a Wound Rotor Synchronous Machine

Optimization, 3D-Numerical Validations and Preliminary Experimental Tests of a Wound Rotor Synchronous Machine

High energy efficiency oriented-control and design of WFSM based on driving condition of electric vehicle

Comparative Study of Electrically Excited Conventional and Homopolar Synchronous Motors for the Traction Drive of a Mining Dump Truck Operating in a Wide Speed Range in Field-Weakening Region

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